#vue js 2 input binding

[laravelvuejs]

Vue JS 2 Tutorial #29 – Input Binding (Creating a blog, part 1) Hey gang, in this Vue JS 2 tutorial we'll start to create our small blog application. The first thing we'll cover is input binding. ----- COURSE LINKS: + Repo ... source

[haris1828]

Angular JavaScript Framework

Angular.js is an open-source framework for building strong online applications. It enables developers to create clear and concise application components by scaling the HTML syntax higher and using HTML as a template language. Because of its data binding and dependency injection features, you can write a lot less code and still obtain more functionality.

Direct access to the browser is available for all of these actions. As a result, as opposed to all the buzz about TezJS or Angular vs. React vs. Vue, Angular web frameworks can be the real deal for any server and business.

In other words, Angular JS is HTML modified for apps. The popularity of HTML is due to its utility in static pages, yet it is not ideal when creating software applications.

Popular AngularJS Frameworks for Web App Development

With Angular JS, there are several progressive frameworks with built-in web components and top AngularJS development tools accessible. The top 11 AngularJS frameworks are listed here if you wish to build cutting-edge web apps.

1. LumX

LumX is one of the most flexible front-end development frameworks for Angular.js. It allows you to develop UI that is both aesthetically beautiful and user-friendly using Google Material Design concepts.

The best CSS framework for Angular is this SaaS-based framework. Customizing the style and feel of your online application is something you might want to think about. The application's performance is improved by efficiently using Gulp to optimise your JS files and SaaS.

2. UI Bootstrap

As the name would suggest, this Angular UI framework uses the dynamic front-end tool for app development. UI Bootstrap has many components with repository dependencies, including Angular-animate, Angular-touch, and Bootstrap CSS.

This impressive framework provides a multitude of tools so you may benefit from Angular JS's rapid web development cycle. Most importantly, without relying on jQuery, JavaScript, or Bootstrap, it may effectively improve the efficiency of your online project.

3. Suave UI

This well-known AngularJS framework is very helpful in designing a user interface (UI) for your online application that is visually appealing. Suave UI's vast library of directives, CSS definitions (including the grid, layered elements, and coloured buttons), and services, which let programmers play around with various UI elements, are its strongest feature.

There is no longer a requirement to include each UI component separately because the UI components are contained in bundle files as well. For developers to accomplish the job through browsers, they only need to issue one command.

4. Ionic

Ionic is a well-known Angular JavaScript framework that may help you create dependable and successful web applications. This completely Angular.js-based platform-independent framework, which enables developers to employ its capabilities on highly interactive applications, fairly dispels the myth about Angular and Angular.js.

Thanks to integrated JS and CSS components, Ionic enables you to cover the majority of the front-end portion. In addition, if new features are needed for the pre-configured CSS classes, you can add them. A free, open-source SDK is also available from Ionic for building user-friendly apps. All things considered, Ionic and AngularJS can be a wonderful match for your web development project.

5. Angular Material

It's a substantial set of UI components that you can use to create consistent and elegant user interfaces, including Datepickers, Inputs, Data Tables, and Cards. It is possible to make use of the Material Design Specification-compliant default styling for each component. Using this Angularjs widget framework, you may change both the behaviour and appearance of your web app components.

There is a sizable CSS library included with Angular Material that contains typography and other useful components. It offers a variety of theming options, robust flex grid layouts, and responsive directives, which together allow for more rapid and flexible Angular app development.

6. Quantum UI

An AngularJS-based framework that speeds up front-end development is Quantum UI, which offers more than 60 rest-service and server-friendly UI components. It has an MVVM architecture and supports a Bootstrap-focused CSS structure.

GitHub is primarily responsible for hosting and maintaining this Angular testing framework. JS is not required because Quantum UI can only be customised using properties and attributes. Although most of its parts are free and open-source, some of them are not and need payment to use.

7. Angular UI Grid

This design has changed the way we think about developing web applications with substantial databases. A number of highly useful capabilities, like e2e testing, visualisation, user interactions, filtering, grouping, and sorting, are offered by Angular UI Grid, which has no additional dependencies outside Angular JS.

Additionally, it enables the native implementation of Angular.js without the requirement for jQuery. Your web app's technical debt can be reduced by using only the capabilities that are required thanks to the plugin design. You may also edit the CSS file and utilise its built-in customizer to change the look and feel of your website as a whole.

8. PrimeNG

The revolutionary JavaScript Building the front end of challenging projects is made easier by the declarative UI architecture of the Angular framework. The diverse library that comes with PrimeNG has more than 70 different UI components. If you want to work on one of its projects, Angular has a lot to offer you, from native themes to pre-built widgets.

With PrimeNG, one of the top front-end web development frameworks, you can easily incorporate a variety of front-end components into your online app, including charts, form inputs, overlays, menus, and more. It offers widgets that you can use in compliance with the MIT licence and that are completely free and open-source.

9. Angular UI Tree

Angular UI Tree is a popular Angular UI framework that is mostly used for sorting hierarchical lists. It also features drag-and-drop capabilities and does not require jQuery, making it simple to change any tree item. For data binding, Angular UI Tree makes use of the built-in AngularJS scope and helps components avoid child nodes.

The problem is that this paradigm is not enough. You will need another AngularJS module or framework to build the entire front-end of your web application.

10. Radian

Thanks to this free and open-source JS framework, developers may easily express plots in HTML texts. You can use unique HTML components in place of building your own JS charting code. With the help of the Angular.js framework, it provides effective capabilities for enabling two-way data binding in JavaScript variables and HTML components.

Additionally, Radian generates graphics using the D3.js plotting tool, allowing us to produce plots as SVG components. Then, any contemporary browser can show the SVG components immediately within the page. To help you get started, this Angular JS widget framework provides detailed documentation and a customizable licence.

11. Foundation

Foundation Foundation is one of the best front-end frameworks on the market right now. It produces a responsive user interface design that is much faster for every medium, device, and accessibility. Its extensive adaptability, flexibility, readability, and semantic features make it simple to create beautiful online and mobile apps.

The Foundation team frequently releases new resources and tools, like as HTML templates and code snippets. The trigger, process bar, dropdown, accordion, alert, and other semantic HTML elements are only a few examples of this framework's semantic HTML components.

[holytheoristtastemaker]

In 2020, we are blessed with a number of frameworks and libraries to help us with web development. But there wasn't always so much variety. Back in 2005, a new scripting language called Mocha was created by a guy named Brendan Eich. Months after being renamed to LiveScript, the name was changed again to JavaScript. Since then, JavaScript has come a long way. 

In 2010, we saw the introduction of Backbone and Angular as the first JavaScript frameworks and, by 2016, 92 per cent of all websites used JavaScript. In this article, we are going to have a look at three of the main JavaScript frameworks (Angular, React and Vue) and their status heading into the next decade.

For some brilliant resources, check out our list of top web design tools, and this list of excellent user testing software, too.

01. Angular

AngularJS was released in 2010 but by 2016 it was completely rewritten and released as Angular 2. Angular is a full- blown web framework developed by Google, which is used by Wix, Upwork, The Guardian, HBO and more.

Pros:

Exceptional support for TypeScript

MVVM enables developers to separate work on the same app section using the same set of data

Excellent documentation

Cons: 

Has a bit of a learning curve

Migrating from an old version can be difficult. 

Updates are introduced quite regularly meaning developers need to adapt to them

What's next?

In Angular 9, Ivy is the default compiler. It's been put in place to solve a lot of the issues around performance and file size. It should make applications smaller, faster and simpler.

When you compare previous versions of Angular to React and Vue, the final bundle sizes were a lot a bigger when using Angular. Ivy also makes Progressive Hydration possible, which is something the Angular team showed off at I/O 2019. Progressive Hydration uses Ivy to load progressively on the server and the client. For example, once a user begins to interact with a page, components' code along with any runtime is fetched piece by piece.

Ivy seems like the big focus going forward for Angular and the hope is to make it available for all apps. There will be an opt-out option in version 9, all the way through to Angular 10.

02. React

React was initially released in 2013 by Facebook and is used for building interactive web interfaces. It is used by Netflix, Dropbox, PayPal and Uber to name a few.

Pros:

React uses the virtual DOM, which has a positive impact on performance 

JSX is easy to write  

Updates don't compromise stability

Cons:

One of the main setbacks is needing third-party libraries to create more complex apps 

Developers are left in the dark on the best way to develop

What's next?

At React Conf 2019, the React team touched on a number of things they have been working on. The first is Selective Hydration, which is where React will pause whatever it's working on in order to prioritise the components that the user is interacting with. As the user goes to interact with a particular section, that area will be hydrated. The team has also been working on Suspense, which is React's system for orchestrating the loading of code, data and images. This enables components to wait for something before they render.

Both Selective Hydration and Suspense are made possible by Concurrent Mode, which enables apps to be more responsive by giving React the ability to enter large blocks of lower priority work in order to focus on something that's a higher priority, like responding to user input. The team also mentioned accessibility as another area they have been looking at, by focusing on two particular topics – managing focus and input interfaces.

03. Vue

Vue was developed in 2014 by Evan You, an ex-Google employee. It is used by Xiaomi, Alibaba and GitLab. Vue managed to gain popularity and support from developers in a short space of time and without the backing of a major brand.

Pros:

Very light in size 

Beginner friendly – easy to learn 

Great community

Cons:

Not backed by a huge company, like React with Facebook and Angular with Google 

No real structure

What's next?

Vue has set itself the target of being faster, smaller, more maintainable and making it easier for developers to target native. The next release (3.0) is due in Q1 2020, which includes a virtual DOM rewrite for better performance along with improved TypeScript Support. There is also the addition of the Composition API, which provides developers with a new way to create components and organise them by feature instead of operation.

Those developing Vue have also been busy working on Suspense, which suspends your component rendering and renders a fallback component until a condition is met.

One of the great things with Vue's updates is they sustain backward compatibility. They don't want you to break your old Vue projects. We saw this in the migration from 1.0 to 2.0 where 90 per cent of the API was the same.

How does the syntax of frameworks compare?

All three frameworks have undergone changes since their releases but one thing that's critical to understand is the syntax and how it differs. Let's have a look at how the syntax compares when it comes to simple event binding:

Vue: The v-on directive is used to attach event listeners that invoke methods on Vue instances. Directives are prefixed with v- in order to indicate that they are special attributes provided by Vue and apply special reactive behaviour to the rendered DOM. Event handlers can be provided either inline or as the name of the method.

React: React puts mark up and logic in JS and JSX, a syntax extension to JavaScript. With JSX, the function is passed as the event handler. Handling events with React elements is very similar to handling events on DOM elements. But there are some syntactic differences; for instance, React events are named using camelCase rather than lowercase.

Angular: Event binding syntax consists of a target event name within parentheses on the left of an equal sign and a quoted template statement on the right. Alternatively, you can use the on- prefix, known as the canonical form.

Popularity and market

Let's begin by looking at an overall picture of the three frameworks in regards to the rest of the web by examining stats from W3Techs. Angular is currently used by 0.4 per cent of all websites, with a JavaScript library market share of 0.5 per cent. React is used by 0.3 per cent of all websites and a 0.4 per cent JavaScript library market share and Vue has 0.3 per cent for both. This seems quite even and you would expect to see the numbers rise.

Google trends: Over the past 12 months, React is the most popular in search terms, closely followed by Angular. Vue.js is quite a way behind; however, one thing to remember is that Vue is still young compared to the other two.

Job searches: At the time of writing, React and Angular are quite closely matched in terms of job listings on Indeed with Vue a long way behind. On LinkedIn, however, there seems to be more demand for Vue developers. 

Stack Overflow: If you look at the Stack Overflow Developer Survey results for 2019, React and Vue.js are both the most loved and wanted web frameworks. Angular sits down in ninth position for most loved but third most wanted.

GitHub: Vue has the most number of stars with 153k but it has the least number of contributors (283). React on the other hand has 140k stars and 1,341 contributors. Angular only has 59.6k stars but has the highest number of contributors out of the three with 1,579.

NPM Trends: The image above shows stats for the past 12 months, where you can see React has a higher number of downloads per month compared to Angular and Vue.

Mobile app development

One main focus for the big three is mobile deployment. React has React Native, which has become a popular choice for building iOS and Android apps not just for React users but also for the wider app development community. Angular developers can use NativeScript for native apps or Ionic for hybrid mobile apps, whereas Vue developers have a choice of NativeScript or Vue Native. Because of the popularity of mobile applications, this remains a key area of investment.

Other frameworks to look out for in 2020

If you want to try something new in 2020, check out these JavaScript frameworks.

Ember: An open-source framework for building web applications that works based on the MVVM pattern. It is used by several big companies like Microsoft, Netflix and LinkedIn.

Meteor: A full-stack JavaScript platform for developing modern web and mobile applications. It's easy to learn and has a very supportive community.

Conclusion

All three frameworks are continually improving, which is an encouraging sign. Everyone has their own perspective and preferred solution about which one they should use but it really comes down to the size of the project and which makes you feel more comfortable. 

The most important aspect is the continued support of their communities, so if you are planning to start a new project and have never used any of the three before, then I believe you are in safe hands with all of them. If you haven't had a chance to learn any of the three frameworks yet, then I suggest making it your New Year's resolution to start learning. The future will revolve around these three.

[t-baba]

An Introduction to Data Visualization with Vue and D3.js

Web applications are normally data-driven and oftentimes the need arises to visualize this data. That’s where charts and graphs come in. They make it easier to convey information, as well as demonstrate correlations or statistical relationships. Information presented in the form of a chart or a graph is also easier for a non-native speaker to understand.

In this tutorial, we’ll learn how to visualize data in a Vue project. For this, we’ll be using the popular D3.js library, which combines powerful visualization components and a data-driven approach to DOM manipulation.

Let’s get started.

Note: the code for this tutorial can be found on GitHub.

What is D3?

As you can read on the project’s home page, D3.js is a JavaScript library for manipulating documents based on data. D3 helps you bring data to life using HTML, SVG, and CSS. Its emphasis on web standards gives you the full capabilities of modern browsers without tying yourself to a proprietary framework.

Whereas most people will refer to D3.js as a data visualization library, it’s not. D3 is more of a framework comprising different parts — such as jQuery parts (which help us select and manipulate DOM elements), Lodash parts, animation parts, data analysis parts, and data visualization parts.

In this tutorial, we’ll be working with the visualization aspect of D3. The real meat of D3 when visualizing data is:

the availability of functions for decorating data with drawing instructions

creating new drawable data from source data

generating SVG paths

creating data visualization elements (like an axis) in the DOM from your data and methods

What We’ll Be Building

We want to create an app that lets users search for a repo on GitHub, then get a visual representation of issues opened in the past week that are still open. The end result will look like this:

Prerequisites

This tutorial assumes you have a working knowledge of Vue. Previous knowledge of D3.js isn’t required, but if you’d like to get up to speed quickly, you might want to read our D3 by example tutorial.

You’ll also need to have Node installed on your system. You can do this by downloading the binaries for your system from the official website, or using a version manager.

Finally, we’ll be using the following packages to build our app:

Vue CLI — to scaffold out the project

D3.js — to visualize our data

Lodash — which provides a handful of utility methods

Moment JS — for date and time formatting

axios — an HTTP client to help us make requests to an external API

New Vue Project

I prefer creating new Vue projects using Vue CLI. (If you’re not familiar with Vue CLI, our beginner’s guide in this Vue series gives a full introduction.) Vue CLI provides a nice folder structure for placing different sections of the code, such as styles, components, and so on.

Make sure that the CLI is installed on your machine:

npm install -g @vue/cli

Then create a new project with the following command:

vue create issues-visualization

Note: while creating a new project using Vue CLI, you’ll be prompted to pick a preset. For this particular project, we’ll just stick with the default (Babel + ESLint).

Once our new Vue project has been created, we cd into the project folder and add the various node modules we’ll need:

npm install lodash d3 axios moment

Even though this is a simple app that doesn’t have many running parts, we’ll still take the components approach instead of dumping all the code inside the App.vue file. We’re going to have two components, the App component and a Chart component that we’re yet to create.

The App component will handle fetching data from GitHub, then pass this data to the Chart component as props. The actual drawing of the chart will happen inside the Chart component. Structuring things this way has the advantage that, if you want to use a library other than axios to fetch the data, it’ll be easier to swap it out. Also, if you want to swap D3 for a different charting library, that’ll be easier too.

Building the Search Interface

We’ll start by building a search interface that lets users enter the name of the repo they want to see visualized.

In src/App.vue, get rid of everything inside the <template> tag and replace the content with this:

<template> <div id="app"> <form action="#" @submit.prevent="getIssues"> <div class="form-group"> <input type="text" placeholder="owner/repo Name" v-model="repository" class="col-md-2 col-md-offset-5" > </div> </form> </div> </template>

Here we have a form which, upon submission, prevents the browser’s default submission action, then calls a getIssues method that we’re yet to define. We’re also using a v-model directive to bind the input from the form to a repository property inside the data model of our Vue instance. Let’s declare that property repository as an empty string. We’ll also add a startDate property, which we’ll later use as the first date in our time range:

import moment from "moment"; import axios from "axios"; export default { name: "app", data() { return { issues: [], repository: "", startDate: null }; }, methods: { getIssues() { // code goes in here } } };

Now on to creating the getIssues method:

getIssues() { this.startDate = moment() .subtract(6, "days") .format("YYYY-MM-DD"); axios .get( `https://api.github.com/search/issues?q=repo:${this.repository}+is:issue+is:open+created:>=${this.startDate}`, { params: { per_page: 100 } } ) .then(response => { const payload = this.getDateRange(); response.data.items.forEach(item => { const key = moment(item.created_at).format("MMM Do YY"); const obj = payload.filter(o => o.day === key)[0]; obj.issues += 1; }); this.issues = payload; console.log(this.issues); }); }

In the above block of code, we start by setting the startDate data property to six days ago and formatting it for use with the GitHub API.

We then use axios to make an API request to GitHub to get all issues for a particular repository that were opened in the past week and that are still open. You can refer to GitHub’s search API if you need more examples on how to come up with query string parameters.

When making the HTTP request, we set the results count to 100 per page (the max possible). There are hardly any repositories with over 100 new issues per week, so this should be fine for our purposes. By default, the per_page value is 30.

If the request completes successfully, we use a custom getDateRange method to initialize a payload variable that we will be able to pass to the Chart component. This payload is an array of objects that will like so:

[ {day: "Dec 7th 18", issues: 0}, {day: "Dec 8th 18", issues: 0}, {day: "Dec 9th 18", issues: 0}, {day: "Dec 10th 18", issues: 0}, {day: "Dec 11th 18", issues: 0}, {day: "Dec 12th 18", issues: 0}, {day: "Dec 13th 18", issues: 0} ]

After that, we iterate over the API’s response. The data we’re interested in is in an items key on a data property on the response object. From this, we take the created_at key (which is a timestamp) and format it as the day property in our objects above. From there, we then look up the corresponding date in the payload array and increment the issues count for that date by one.

Finally, we assign the payload array to our issues data property and log the response.

Next, let’s add in the getDateRange method:

methods: { getDateRange() { const startDate = moment().subtract(6, 'days'); const endDate = moment(); const dates = []; while (startDate.isSameOrBefore(endDate)) { dates.push({ day: startDate.format('MMM Do YY'), issues: 0 }); startDate.add(1, 'days'); } return dates; }, getIssues() { ... } }

Before we get to the visualization bit, let’s also log any errors we might encounter when making our request to the console (for debugging purposes):

axios .get( ...) .then(response => { ... }) .catch(error => { console.error(error); });

We’ll add some UX for informing the user in the case that something went wrong later.

So far, we have an input field that lets the user enter the organization/repository name they wish to search issues for. Upon form submission, all issues opened in the past one week are logged to the console.

Below is an example of what was logged on the console for the facebook/react repo:

If you start up the Vue dev server using npm run serve and enter some different repos, you should see something similar. If you’re stuck for inspiration, check out GitHub’s Trending page.

Next comes the fun bit — visualizing this data.

Drawing a Bar Chart Using D3

Earlier on, we mentioned that all the drawing will be handled inside a Chart component. Let’s create the component:

touch src/components/Chart.vue

D3 works on SVG elements, and for us to draw anything with D3, we need to have an SVG element on the page. In our newly created component (src/components/Chart.vue), let’s create an SVG tag:

<template> <div> <svg></svg> </div> </template>

For this particular tutorial, we’ll visualize our data using a bar chart. I picked a bar chart because it represents a low complexity visual element while it teaches the basic application of D3.js itself. The bar chart is also a good intro to the most important D3 concepts, while still having fun!

Before proceeding, let’s update our App component to include the newly created Chart component below the form:

<template> <div id="app"> <form action="#" @submit.prevent="getIssues"> ... </form> <chart :issues="issues"></chart> </div> </template>

Let’s also register it as a component:

import Chart from './components/Chart.vue'; export default { name: "app", components: { Chart }, ... }

Notice how we’re passing the value of the issues data property to the Chart component as a prop:

<chart :issues="issues"></chart>

Let’s now update our Chart component to make use of that data:

<script> import * as d3 from "d3"; import _ from "lodash"; export default { props: ["issues"], data() { return { chart: null }; }, watch: { issues(val) { if (this.chart != null) this.chart.remove(); this.renderChart(val); } }, methods: { renderChart(issues_val) { // Chart will be drawn here } } }; </script>

In the above code block, we’re importing D3 and Lodash. We then instantiate a chart data property as null. We’ll assign a value to this when we start drawing later on.

Since we want to draw the chart every time the value of issues changes, we’ve created a watcher for issues. Each time this value changes, we’ll destroy the old chart and then draw a new chart.

Drawing will happen inside the renderChart method. Let’s start fleshing that out:

renderChart(issues_val) { const margin = 60; const svg_width = 1000; const svg_height = 600; const chart_width = 1000 - 2 * margin; const chart_height = 600 - 2 * margin; const svg = d3 .select("svg") .attr("width", svg_width) .attr("height", svg_height); }

Here, we set the height and width of the SVG element we just created. The margin attribute is what we’ll use to give our chart some padding.

D3 comes with DOM selection and manipulation capabilities. Throughout the tutorial, you’ll see lot’s of d3.select and d3.selectAll statements. The difference is that select will return the first matching element while selectAll returns all matching elements.

The post An Introduction to Data Visualization with Vue and D3.js appeared first on SitePoint.

by Christopher Vundi via SitePoint https://ift.tt/2KdTjHU

[kavindius]

Introduction to Client-Side Development

Introduction to client-side elements

Distributed systems use client-side elements, so that users can interact with.

The client-side elements include,

Views – what user see

Controller – contain event handlers for the views

Client-model – business logic and data

View Development

Browser-based clients’ Views comprises two main elements

Content – HTML

Formatting – CSS

HTML

HTML Elements

o   Structural elements – header, footer, nav, aside

o   Text elements – headings, paragraphs, line breaks

o   Images

o   Hyperlinks

o   Data representational elements – Lists, Tables

o   Form elements – Input, Radio buttons, Check boxes, Buttons

 CSS (Cascading Style Sheets)

 Used to decorate or format content.

Advantages:

Reduce HTML formatting tags

Easy modification

Faster loading

Save lot of work and time

Three main selectors of CSS

Element Selector

             -  Selects elements based on the name

ID Selector

             -  Uses the id attribute of HTML element to select a specific element

Class Selector

             - Selects elements with a specific class attribute

Advanced selectors

Pseudo Classes                                        Pseudo Elements

:link                                                         first-letter

:visited                                                    first-line

:hover                                                     first-child

Specificity:

Specificity is, which browser decide which css property values are the most relevant to an element and, therefore, will be applied.

Specificity is a weight that is applied to a given css declaration determined by the number of each selector type in the matching selector.

The following list of selector types increases by specificity

1.     Type selector and pseudo elements

2.     Class selectors, attribute selectors and pseudo classes

3.     ID selectors

 CSS Advanced features

Web fonts - Allow you to use custom fonts other than device fonts

Colors, gradients, backgrounds

Transformations and animations

Media

Media queries

Media queries can be used to check many things.

-        Width and height of the viewport

-        Width and height of the device

-        Orientation

-        Resolution

Can be used as

o   Inline CSS

o   Internal CSS sheets

o   External CSS sheets

 Inline CSS

Advantages:

Inline CSS can be used for many purposes, some of which include:

Testing:      Many     web designers use Inline CSS when they begin working on new projects, this     is because its easier to scroll up in the source, rather than change the     source file. Some also using it to debug their pages, if they     encounter a problem which is not so easily fixed. This can be done in     combination with the Important rule of CSS.

Quick-fixes:     There are     times where you would just apply a direct fix in your HTML source, using     the style attribute, but you would usually move the fix to the relevant     files when you are either able, or got the time.

Smaller     Websites: The     website such as Blogs where there are only limited number of pages, using     of Inline CSS helps users and service provider.

Lower the     HTTP Requests:     The major benefit of using Inline CSS is lower HTTP Requests which     means the website loads faster than External CSS.

Disadvantages

Inline CSS some of the disadvantages of which includes:

Overriding: Because     they are the most specific in the cascade, they can over-ride things you     didn’t intend them to.

Every     Element:     Inline styles must be applied to every element you want them on. So if you     want all your paragraphs to have the font family “Arial” you have to add     an inline style to each <p> tag in your document. This adds     both maintenance work for the designer and download time for the reader.

Pseudo-elements: It’s     impossible to style pseudo-elements and classes with inline styles. For     example, with external and internal style sheets, you can style the     visited, hover, active, and link color of an anchor tag. But with an     inline style all you can style is the link itself, because that’s what the     style attribute is attached to.

Internal CSS

Advantages

Since the Internal CSS have more preference over Inline CSS. There are numerous advantages of which some of important are an under:

Cache     Problem:     Internal styles will be read by all browsers unless they are hacked to     hide from certain ones. This removes the ability to use media=all or     @import to hide styles from old, crotchety browsers like IE4 and NN4.

Pseudo-elements: It’s     impossible to style pseudo-elements and classes with inline styles. With     Internal style sheets, you can style the visited, hover, active, and link     color of an anchor tag.

One style of     same element: Internal     styles need not be applied to every element. So if you want all your     paragraphs to have the font family “Arial” you have to add an Inline style     <p> tag in Internal Style document.

No     additional downloads: No     additional downloads necessary to receive style information or we have less     HTTP Request

Disadvantages

Multiple     Documents:     This method can’t be used, if you want to use it on multiple web pages.

Slow Page     Loading:     As there are less HTTP Request but by using the Internal CSS the page load     slow as compared to Inline and External CSS.

Large File     Size: While     using the Internal CSS the page size increases but it helps only to     Designers while working offline but when the website goes online it     consumers much time as compared to offline.

External CSS

Advantages

There are many advantages for using external CSS and some of are:

 Full      Control of page structure:      CSS allows      you to display your web page according to W3C HTML standards without      making any compromise with the actual look of the page.

 Reduced file-size: By      including the styling of the text in a separate file, you can      dramatically decrease the file-size of your pages. Also, the      content-to-code ratio is far greater than with simple HTML pages, thus      making the page structure easier to read for both the programmer and the      spiders.

 Less load time: Today,      when Google has included the Loading time in his algorithm, its become      more important to look into the page loading time and another benefit of      having low file-size pages translates into reduced bandwidth costs.

 Higher page ranking: In      the SEO, it is very important to use external CSS. In SEO, the content is      the King and not the amount of code on a page. Search engines spider will      be able to index your pages much faster, as the important information can      be placed higher in the HTML document. Also, the amount of relevant      content will be greater than the amount of code on a page. The search      engine will not have to look too far in your code to find the real content.      You will be actually serving it to the spiders “on a platter”.

 There are many frameworks/libraries/plugins to support view development

o   They dynamically generate HTML+CSS code

o   In server and/or client side

o   May have JS-based advanced interactive features

 Other tools

jQuery - A JS library, but can be seen a framework too

jQuery UI - Focus on GUI development

Bootstrap - To rapidly design and develop responsive web pages and templates

Angular - A JS framework/platform to build frontend applications

React – A JavaScript library for building user interfaces

Templates are used to maintain consistency across pages in the web site/application.

Template engines are available for both server and client sides

Client-side (JS-based) template engines - NUNJUCKS, PUG, MUSTACHE.JS, HANDLEBARS

Server-side template engines - Twig, jTwig, Thymeleaf, Apache Velocity

Plug-ins

Plug-ins are mainly to add widgets to the Views

 Component Development

 Browser-based clients’ components comprises two main aspects

Controllers

Client-model

The components of browser-based clients are developed using JS/JS-based frameworks, libraries, and plugins.

Main features of client-side development tools

o   DOM processing (dynamic content generation, change, removal)

o   Data processing

o   Data persistence

o   Session management

o   Communication

JS6 (JavaScript6)

Also called ECMAScript6

New features

JavaScript let

               - The let statement allows you to declare a variable with block scope.

JavaScript const

               - The const statement allows you to declare a constant

Exponentiation (**)

               - The exponentiation operator (**) raises the first operand to the power of the second operand.

Default parameter values

               - Default parameter values allows function parameters to have default values.

Array.find()

              - The find() method returns the value of the first array element that passes a test function.

              - function takes 3 arguments:

The item value

The item index

The array itself

Array.findIndex()

              - The findIndex() method returns the index of the first array element that passes a test function.

              - function takes 3 arguments:

The item value

The item index

The array itself

Web workers

This API is meant to be invoked by web application to spawn background workers to execute scripts which run in parallel to UI page

Web storage / Session storage

This is for persistent data storage of key-value pair data in Web clients.

GeoLocation

Identify the device location

File API

Handle the local files

Image capturing

Use local hardware

Top JS frameworks/ libraries

jQuery - Basic and simple. Cover the complexity of JS and provides cross-browser compatibility.

React - powers Facebook, Ease of Learning, DOM Binding, Reusable Components, Backward Compatibility

Angular - Support for Progressive Web Applications, Build Optimizer, Universal State Transfer API and DOM, Data Binding and MVVM

Vue – light weight, with a much-needed speed and accuracy

Generic client-side features

 Form/ data validation

Dynamic content generating/updating

Some business logic

Delta communication

References

https://www.w3schools.com/css/css_syntax.asp

https://developer.mozilla.org/en-US/docs/Web/CSS/Specificity

https://www.w3schools.com/cssref/css3_pr_mediaquery.asp

https://vineetgupta22.wordpress.com/2011/07/09/inline-vs-internal-vs-external-css/

https://www.w3schools.com/js/js_es6.asp

[rafi1228]

Vue JS is an awesome JavaScript Framework for building Frontend Applications! VueJS mixes the Best of Angular + React!

What you’ll learn

Build amazing Vue.js Applications – all the Way from Small and Simple Ones up to Large Enterprise-level Ones

Understand the Theory behind Vue.js and use it in Real Projects

Leverage Vue.js in both Multi- and Single-Page-Applications (MPAs and SPAs)

Requirements

Basic JavaScript Knowledge is Required

ES6 Knowledge is a Plus but not a Must

Basic HTML and CSS Knowledge is assumed throughout the Course

Description

Hear what students are saying about the course:

He knows how to teach. Splits every details into smaller parts and makes another video for each part. For this reason you don’t feel yourself boring while watching videos because lots of them about 2-3 mins not more. One of the best teachers in Udemy that I saw.

The instructor uses an easy-to-follow approach that builds knowledge easily and incrementally.

Very well laid out tutorials that are easy to follow but also run at a pace that doesn’t get boring.

About the course

No matter at which Metric you look (Google Trends, Github Stars, Tweets …) VueJS is the Shooting Star in the World of JavaScript Frameworks – it simply is amazing!

Frontend Frameworks are extremely popular because they give us this reactive, great User Experience we know from Mobile Apps – but now in the Browser! No wonder that Jobs requiring Frontend Framework Skills like VueJS are amongst the best paid ones in the Industry!

You may know Angular 2 and ReactJS, well, VueJS combines the Best of both Frameworks and makes building anything from small Widgets to big, Enterprise-Level Apps a Breeze and a whole lot of Fun! And if you don’t know the two mentioned Frameworks: That’s fine, too, this Course does not expect any knowledge of any other Frontend Framework – you will learn it all throughout this Course!

### This Course covers it all! ###

We’ll start at the very Basics, what Vue.js is and how it works before we move on to more Complex and Advanced Topics but I’ll be honest: It’s too much to fit it all into one Sentence, so here’s what you’ll learn in this Course:

What is VueJS and Why would you use it?

Setting up a Development Environment and Workflow

The Basics (including the basic Syntax, Understanding Templates and much more!)

Interacting with DOM (Rendering Lists, Conditionally attaching/ detaching Elements …)

Using Components (and what Components are to begin with)

Binding to Form Inputs

All about Directives, Filters and Mixins

How to make your App more Beautiful with Animations and Transitions

How to create an awesome Single-Page-Application (SPA) with Routing

How to improve State Management by using Vuex

How to Deploy the App

And much more …

And all the accompanied with many Exercises and multiple Course Projects – because it isn’t just about seeing Code, it’s about using and practicing it!

### Is this Course for you? ###

Now that you know what this Course is about, let’s see if this Course is for you!

Here are three Types of Students who will love this Course:

Student #1:

Has some JavaScript Experience and is interested in what this Language can do. He heard and read that JavaScript allows you to create nice Web Applications and enhance existing Web Pages. VueJS is your choice!

Student #2:

He already has some Experience with other Frontend Frameworks like Angular (2) or ReactJS. But either due to interest or disappointment of the existing Frameworks, he seeks some Alternatives – VueJS might be what you were looking for!

Student #3:

Has Experience with backend Frameworks/ Languages but now also wants to enter the Frontend World. VueJS is an awesome choice here, it’s fun, it uses native JS and it’s extremely powerful!

Bonus: Student #4

Is disappointed by Angular 2. Does a good Framework need 2 hours of setup? No, certainly not – as VueJS will prove to this Student!

Let’s dive into VueJS right now!

Who this course is for:

This Course is for Everyone interested in Frontend Development and Major JavaScript Frameworks

This Course is for you if you want to create Reactive Applications, which run in the Browser

This Course also targets Students who prefer a native JavaScript Framework which makes Getting Started much simpler than Angular 2

Displeased with Angular 2? VueJS is for you!

Created by Maximilian Schwarzmüller Last updated 11/2018 English English

Size: 4.80 GB

   Download Now

https://ift.tt/2eydV0z.

The post Vue JS 2 – The Complete Guide (incl. Vue Router & Vuex) appeared first on Free Course Lab.

[suzanneshannon]

8 Most Interesting JavaScript Frameworks to Learn in 2019

Web development has become so complex, that these days many developers rely on frameworks when building applications for the web. JavaScript frameworks speed up the development workflow, enforce best practices, and provide you with a maintainable code base and an effective architecture.

In this collection, you can find 8 awesome JavaScript frameworks that might be worth your attention in 2019. It’s not a comprehensive list by any means, but it can be a good starting point to assess the landscape of JavaScript frameworks and decide what to learn next.

1. React

React is a popular JavaScript framework, created and maintained by Facebook. You can use it to build interactive user interfaces for single page applications. React has introduced a component-based architecture to web development that challenged the traditional MVC (Model-View-Controller) pattern. React components are encapsulated and manage their own states. When the data changes, React updates only the components that have been affected by the change.

There’s a huge ecosystem around React, including learning materials, an enthusiastic developer community, and a plethora of tools. Although React has been around for a while, it’s still evolving. There are a lot of jobs for React developers, too. If you want to master a JavaScript framework that will likely stay relevant in the future React is definitely worth your time.

2. Vue.js

Vue.js allows you to build single page applications and UI components using a lightweight and versatile JavaScript framework. It’s progressive which means you can use it as both a library that adds extra features to an existing user interface or a framework that runs your whole application. Vue is frequently compared to React, as it also splits a web page into reusable components.

Vue uses its own HTML template syntax with which you can bind the rendered DOM to the underlying data. When the data changes, Vue automatically updates all instances in the HTML. Although React is still more popular, Vue is quickly catching up. It has a flat learning curve, great dev tools (even a Vue CLI), and some decent learning resources, too.

3. Angular

Angular is a TypeScript-based JavaScript framework developed and maintained by Google. The versioning of the Angular framework is a bit confusing. Angular 2 was a ground-up rewrite of AngularJS (1.x). By now, it has reached version number 7 (Angular 7). While AngularJS was an MVC (Model-View-Controller) framework, Angular 2+ is considered component-based. They follow a completely different logic, so AngularJS apps can’t be updated to Angular 2+.

With Angular, you can create single-page applications for any platforms, including web, mobile web, native mobile, and native desktop. It’s a great choice if you have already used a statically-typed language such as Java, C++, or C#. It takes more time to learn Angular than Vue or React, as it has a large code base and several possibilities. But, it has a huge ecosystem and is very popular on the job market, too.

4. Next.js

Next.js is a minimalist JavaScript framework that makes server-side rendering possible in React applications. By default, React renders all content on the client side, which leads to a couple of problems. First, the user has to wait until all scripts load in the browser. Second, it might cause some SEO issues, too, as search engines are still not that good at indexing JS apps. The solution to this problem is rendering content on the server side before sending it to the browser. And, this is what Next.js does really well.

It comes with awesome features such as hot code reloading, automatic code splitting, automatic routing, and more. If you use Next together with React, you get Vue’s simplicity combined with React’s powerful features. If you already use React, Next is definitely a good next step in mastering JavaScript app development. Next.js has great in-house tutorials that let you get started with the framework in just 1-2 hours (if you are an experienced JS developer).

5. Relay

Relay is another JavaScript framework that helps you create better React applications. Just like React, Relay is also developed and maintained by Facebook. It allows you to create data-driven React apps powered by GraphQL. GraphQL is a query language with which you can make specific server requests—it’s considered as an alternative to REST.

The Relay framework enables you to create static queries by adding GraphQL to the views that will use the data. Then, Relay aggregates these queries into consistent network requests. By generating code ahead of time, you can create faster and more performant applications. You can either convert your existing React apps with Relay or start to develop a new one using Relay Modern (a streamlined version of the Relay framework).

6. Mithril.js

Mithril is a lightweight JavaScript framework with several features similar to React and Vue. You can check out the detailed framework comparison to React, Vue, and Angular in Mithril’s documentation. If you are on the look for a really small framework that lets you build single page applications, Mithril might be an excellent choice for you. It weighs just 8 KB (gzipped) and runs almost twice as fast as React and Angular.

Similar to view frameworks like Vue and React, Mithril also relies on components and interacts with the virtual DOM. However, it also has some built-in utility modules you won’t find in React, such as out-of-the-box XHR and routing.

Mithril has a relatively flat learning curve. You can get started learning with the Mithril team’s 10-minute learning guide (right on the homepage). Due to its simplicity, Mithril might not be the best solution for a complex project, but it provides you with everything you need to create a simple application.

7. Aurelia

Aurelia focuses on web standards, uses convention over configuration, and comes with minimal framework intrusion. It’s a unique JavaScript framework, as it lets you build UI components using vanilla JavaScript or TypeScript. Aurelia components are, in fact, simple JS/TS classes with corresponding HTML templates. The syntax is quite straightforward, here’s a simple example from the docs:

// app.js export class App { welcome = "Welcome to Aurelia"; }

<!-- app.html --> <template> <form> <label for="name-field">What is your name?</label> <input id="name-field" value.bind="name & debounce:500"> <p if.bind="name">${welcome}, ${name}!</p> </template>

As you can see, if you know how to use HTML and JS, you can start creating Aurelia applications without much further learning. Aurelia has a reactive binding system and syncs your UI with the best performance possible. It also has a fairly large ecosystem with developer tools like a CLI, Chrome debugger, and Visual Studio Code plugin.

8. Svelte

The Svelte framework has been created with the intent to solve the JavaScript bloat crisis of the web. Its creators call it the “magical disappearing UI framework”, as it transforms framework code into framework-less vanilla JavaScript. Svelte has its own compiler that converts the app code into client-side JavaScript at build time, instead of interpreting it at runtime as most frameworks do. As a result, the framework code disappears by the time it reaches the user’s browser.

Svelte apps are built of single-file components using the .html extension. You can either create an entire application with Svelte or incrementally add it to an existing code base. It’s also possible to ship standalone Svelte components that work anywhere without any external dependencies. Svelte has a relatively flat learning curve. If you want to experiment with a JavaScript framework that relies on its own compiler, Svelte is worth a closer look.

More JavaScript Frameworks

The frameworks we have discussed in this article are just a small selection of all JavaScript frameworks—the ones we have found the most interesting at this point in time. If you are interested in more options, you can also consider having a look at the following frameworks:

Ember.js

Meteor.js

Knockout

React Material UI

If you want more resources related to React – which is still the no. 1 JavaScript framework – take a look at our collection of the best React development tools or learn how to get started with Facebook’s Create React App, too.

8 Most Interesting JavaScript Frameworks to Learn in 2019 published first on https://deskbysnafu.tumblr.com/

[connecticut-seo-adwords]

Vue.js Tutorial: A Prerendered, SEO-Friendly Example [Live Demonstration]

"I can't take it anymore; our in-house reporting panel SUCKS."

Our product manager was pissed off. The crumbling app he was trying to pull data from was... disastrous.

"Max, we need better reporting. Can you fix it?"

"Honestly, I'd much rather build a brand new app," I answered, grinning.

"Sure, go ahead. Carte blanche, buddy."

I rubbed my hands, grinning still. FINALLY, an occasion to use the JS framework everyone's been raving about: Vue.js.

I've just finished coding that app, and I loved it.

Inspired by my recent experience, I took some time to craft a Vue.js tutorial for our community. Now, I'll be covering mostly two topics in here:

How to build a lean web app with Vue.js

How to handle Vue.js SEO & prerendering with

More specifically, I'll walk you through creating a small shop with SEO-friendly product pages. A live demo & code repo will also be available. If you're looking for more in-depth knowledge on SEO with a Vue.js SPA we also crafted a video tutorial that you'll find at the end of this post.

 Post update: We're progressively migrating Snipcart's front-end from Backbone to Vue.js, you can read about it right here. Vue transformations are also covered here, and building a blog with Vue here.

Let's start by dropping a little knowledge for those not familiar with the progressive framework.

What is Vue.js exactly?

Vue is a lightweight, progressive JavaScript framework that helps you create web interfaces.

Don't be fooled by the "JS framework" part of the definition just yet. For Vue is quite different from its trendy counterparts—React.js & Angular.js. For starters, it's not an open source by-product of commercial tech giants like Google & Facebook.

Evan You first released it in 2014, with the intention of creating an "incrementally adoptable," modern JS library. That's one of the most powerful features of Vue: creating pluggable components you can add to any project without undergoing major refactors. Any developer can try out Vue in a project without jeopardizing or burdening its existing code base.

Pattern terminology apart, I feel like the premises of Vue are:

1. You can't know the entire state architecture of your app from the start

2. Your data will surely change on the runtime

It's around these constraints that the library shapes itself: it's incremental, component-based, and reactive. The granular architecture of the components lets you easily separate your logic concerns while maintaining reusability for them. On top of that, it natively binds your data to the views so they magically update when necessary (through watchers). Although the same definition could be said of many reactive frontend frameworks, I found Vue just achieved it more elegantly, and, for the majority of my use cases, in a better way.

Vue has a softer learning curve than, say, React, which requires JSX templating knowledge.

One could even say Vue is React minus the awkward parts! ;)

For more in-depth comparisons with other JS frameworks—React, Angular, Ember, Knockout, Polymer, Riot—check out the official docs on the subject.

Last but not least, the performance & insightful dev tools Vue offers make for a great coding experience. No wonder its adoption is skyrocketing.

From open source projects like Laravel & PageKit to enterprise ones like Gitlab & Codeship (not to mention the Alibaba & Baidu giants), lots of organizations are using Vue.

Now, however, it's time to see how we are going to use it.

Our Vue.js example: a quick, SEO-friendly e-commerce app

In this section, I'll show you how to build a small e-commerce app using Vue 2.0 & Snipcart, our HTML/JS cart platform for devs. We'll also see how to make sure product pages are properly "crawlable" for search engine bots.

Pre-requisites

If you want to dive deeper into all things Vue 2.0, Laracasts' got you covered with this series.

1. Setting up the environment

First, we'll use the vue-cli to scaffold a basic Vue app. In your favorite terminal, input:

npm install -g vue-cli vue init webpack-simple vue-snipcart

This will create a new vue-snipcart folder containing a basic configuration using vue-loader. It will also enable us to write a single file component (template/js/css in the same .vue file).

We want this demo to feel as real as possible, so we'll add two more modules widely used in Vue SPA for large applications: vuex and vue-router.

vuex is a flux-like state manager—really light yet very powerful. It's strongly influenced by Redux, on which you can learn more here.

vue-router lets you define routes to dynamically handle components of your app.

To install these, go in your new vue-snipcart project folder and run the following commands:

npm install --save vue-router npm install --save vuex

Another thing to install now is the prerender-spa-plugin, which will enable us to prerender crawlable routes:

npm install --save prerender-spa-plugin

We're almost there, the last four packages are:

pug—for templates, I prefer that to HTML.

vuex-router-sync—to inject some of our router information directly in our vuex state.

copy-webpack-plugin—to make it easier for us to include our static files in the dist folder.

babel-polyfill—to run Vue inside PhantomJS (used by our prerender plugin).

npm install --save pug npm install --save vuex-router-sync npm install --save copy-webpack-plugin npm install --save babel-polyfill

2. Assembling the architecture

Installs: check. Time to set everything so it can handle our store's data.

Let's start with our vuex store. We'll use this to store/access our products info.

For this demo, we'll use static data, although this would still work if we were to fetch it instead.

2.1 Building the store

Create a store folder in the src one, along with 3 files:

state.js to define our static products

getters.js to define a get function to retrieve products by ID

index.js to bundle the first two together

//state.js export const state = { products: [ { id: 1, name: 'The Square Pair', price: 100.00, description: 'Bold & solid.', image: 'https://snipcart.com/media/10171/glasses1.jpeg' }, { id: 2, name: 'The Hip Pair', price: 110.00, description: 'Stylish & fancy.', image: 'https://snipcart.com/media/10172/glasses2.jpeg' }, { id: 3, name: 'The Science Pair', price: 30, description: 'Discreet & lightweight.', image: 'https://snipcart.com/media/10173/glasses3.jpeg' } ] } //getters.js export const getters = { getProductById: (state, getters) => (id) => { return state.products.find(product => product.id == id) } } //index.js import Vue from 'vue' import Vuex from 'vuex' import { state } from './state.js' import { getters } from './getters.js' Vue.use(Vuex) export default new Vuex.Store({ state, getters })

2.2 Building the router

We'll keep our store basic: a homepage listing products + a details page for each product. We'll need to register two routes in our router to handle these:

import VueRouter from 'vue-router' import Vue from 'vue' import ProductDetails from './../components/productdetails.vue' import Home from './../components/home.vue' Vue.use(VueRouter) export default new VueRouter({ mode: 'history', routes: [ { path: '/products/:id', component: ProductDetails }, { path: '/', component: Home }, ] })

We haven't created these components yet, but no worries, they're coming later. ;)

Note that we employed mode: 'history' in our VueRouter declaration. This is important, as our prerender plugin won't work otherwise. The difference is that the router will use the history API instead of hashbangs to navigate.

2.3 Linking everything together

Now that we have both our store and our router, we'll need to register them in our app. Hop in your src/main.js file and update it as follows:

import Vue from 'vue' import App from './App.vue' import router from './router' import { sync } from 'vuex-router-sync' import store from './store' sync(store, router) new Vue({ store, router, render: h => h(App) }).$mount('#app')

Quite simple, right? As mentioned earlier, the sync method from the vuex-router-sync package injects some of the current route information in our store state. We'll use this later on.

3. Crafting the Vue components

Having data feels awesome, but showing it is even better. We'll use three components to achieve that:

Home to show a products listing

Product to be used for each product by our Home component

ProductDetails for our individual product pages

Each of them will be in the src/components folder.

//Home.vue div(class="products") div(v-for="product in products", class="product") product(:product="product") import Product from './../components/Product.vue' export default { name: 'home', components: { Product }, computed: { products(){ return this.$store.state.products } } }

Above, we use the store state to get our products and iterate on them to render a product component for each one.

//Product.vue div(class="product") router-link(v-bind:to="url").product img(v-bind:src="product.image" v-bind:alt="product.name" class="thumbnail" height="200") p {{ product.name }} button(class="snipcart-add-item" v-bind:data-item-name="product.name" v-bind:data-item-id="product.id" v-bind:data-item-image="product.image" data-item-url="/" v-bind:data-item-price="product.price") | Buy it for {{ product.price }}$ export default { name: 'Product', props: ['product'], computed: { url(){ return `/products/${this.product.id}` } } }

We link to each page, handled by our router, which brings us to our last component.

//ProductDetails.vue div(class="product-details") img(v-bind:src="product.image" v-bind:alt="product.name" class="thumbnail" height="200") div(class="product-description" v-bind:href="url") p {{ product.name }} p {{ product. description}} button(class="snipcart-add-item" v-bind:data-item-name="product.name" v-bind:data-item-id="product.id" v-bind:data-item-image="product.image" data-item-url="/" v-bind:data-item-price="product.price") | Buy it for {{ product.price }}$ export default { name: 'ProductDetails', computed: { id(){ return this.$store.state.route.params.id }, product(){ return this.$store.getters.getProductById(this.id) } } }

This one has a little more logic than the others. We get the current ID from the route and then get the associated product from the getter we previously created.

4. Creating the app

Let's use our new components, yeah?

Open the App.vue file. Content in there is still the default one generated from the vue init webpack-simple scaffolding.

Swap everything to this instead:

div(id="app") TopContext router-view import TopContext from './components/TopContext.vue' export default { name: 'app', components: { TopContext } }

The TopContext component isn't really important; it acts only as a header. The key part is the router-view one: it will be determined dynamically by VueRouter, and the associated component we defined earlier will be injected instead.

The last view to update is the index.html. For our use case, we'll create a new static folder in the src one. There, we'll move our index file, and update as follows:

vue-snipcart

You can see we added Snipcart's necessary scripts in the default view. A small component granularly including them could have been cleaner, but since all our views need them, we did it this way.

5. Handling Vue.js SEO with the Prerender plugin

Everything in our app is rendered dynamically with JS, which isn't super for SEO: the asynchronous content of our pages can't be optimally crawled by search engine bots. It wouldn't be smart for us to have an e-commerce website missing out on all that organic traffic opportunity!

Let's use prerendering to bring more SEO opportunities to our Vue.js app. (You can also watch me doing it live in the video tutorial below!)

Compared to Vue SSR (Server-Side Rendering), prerendering is much easier to set up. And quite frankly, the former is , unless you're dealing with lots of routes. Plus, both achieve quite similar results on an SEO level.

Prerendering will allow us to keep our frontend as a fast, light static site that's easily crawlable.

Let's see how we can use it. Go to your webpack file and add the following declaration to your top level export:

plugins: [ new CopyWebpackPlugin([{ from: 'src/static' }]), new PrerenderSpaPlugin( path.join(__dirname, 'dist'), [ '/', '/products/1', '/products/2', '/products/3'] ) ]

Okay, so how does this work?

The CopyWebpackPlugin will copy our static folder (only containing the view referencing our Vue App) to our dist folder. Then, the PrerenderSpaPlugin will use PhantomJS to load the content of our pages and use the results as our static assets.

And voilà! We've now got prerendered, SEO-friendly product pages for our Vue app.

You can test it yourself with the following command:

npm run build

This will generate a dist folder containing everything needed for production.

Other important SEO considerations

Consider adding appropriate meta tags & a sitemap for your app pages. You can learn more about meta tags in the "postProcessHtml" function here.

Great content plays a huge role in modern SEO. We'd advise making sure content on your app is easy to create, edit, and optimize. To empower content editors, consider throwing a headless CMS into the mix and building a true JAMstack.

An HTTPS connexion is now officially a ranking factor for Google. We're hosting this demo on Netlify, which provides free SSL certificates with all plans.

GitHub repo, live Vue demo & video tutorial

Go ahead, check out the demo & code repo for this tuts!

Conclusion

Since I had worked with Vue before, crafting this tutorial went rather smoothly. I must've spent an hour on the demo. I struggled a bit to get CopyWebpackPlugin to work, but eventually found answers in their docs.

I hope this post encourages developers to start using Vue in some projects. Like I said, you can start slowly, by developing a tiny part of an existing project with it. I think it's definitely worth a try. Our lead developer is coding our latest merchant dashboard feature with Vue as I'm writing this, and he loves it. Plus, when set up right, a Vue app can drive good SEO results.

If you feel like getting inspired first, check out the Vue.js Awesome list, which curates loads of Vue examples & projects.

You can also take a look at our tutorial using the kick-ass Vue.js framework Nuxt.js.

PS: We'll try to get Evan You to use Snipcart for the Vue swag, but no promise. We know Threadless is kind of awesome for t-shirts. :)

If you found this post valuable, take a second to share it on Twitter. Found something we missed? Got thoughts on Vue, other frameworks, or handling SEO with them? Comments are all yours!

Source

https://snipcart.com/blog/vuejs-tutorial-seo-example

[mbaljeetsingh]

Top 10 JavaScript Errors From 1000+ Projects (and How to Avoid Them)

To give back to our community of developers, we looked at our database of thousands of projects and found the top 10 errors in JavaScript. We’re going to show you what causes them and how to prevent them from happening. If you avoid these "gotchas," it'll make you a better developer.

Because data is king, we collected, analyzed, and ranked the top 10 JavaScript errors. Rollbar collects all the errors for each project and summarizes how many times each one occurred. We do this by grouping errors according to their fingerprints. Basically, we group two errors if the second one is just a repeat of the first. This gives users a nice overview instead of an overwhelming big dump like you’d see in a log file.

We focused on the errors most likely to affect you and your users. To do this, we ranked errors by the number of projects experiencing them across different companies. If we looked only at the total number of times each error occurred, then high-volume customers could overwhelm the data set with errors that are not relevant to most readers.

Here Are the Top 10 JavaScript Errors:

Each error has been shortened for easier readability. Let’s dive deeper into each one to determine what can cause it and how you can avoid creating it.

1. Uncaught TypeError: Cannot Read Property

If you’re a JavaScript developer, you’ve probably seen this error more than you care to admit. This one occurs in Chrome when you read a property or call a method on an undefined object. You can test this very easily in the Chrome Developer Console.

This can occur for many reasons, but a common one is the improper initialization of state while rendering the UI components. Let’s look at an example of how this can occur in a real-world app. We’ll pick React, but the same principles of improper initialization also apply to Angular, Vue or any other framework.

There are two important things realize here:

A component’s state (e.g. this.state) begins life as undefined.

When you fetch data asynchronously, the component will render at least once before the data is loaded – regardless of whether it’s fetched in the constructor, componentWillMount or componentDidMount. When Quiz first renders, this.state.items is undefined. This, in turn, means ItemList gets items as undefined, and you get an error – "Uncaught TypeError: Cannot read property ‘map’ of undefined" in the console.

This is easy to fix. The simplest way: Initialize state with reasonable default values in the constructor.

The exact code in your app might be different, but we hope we’ve given you enough of a clue to either fix or avoid this problem in your app. If not, keep reading because we’ll cover more examples of related errors below.

2. TypeError: ‘undefined’ Is Not an Object (evaluating...)

This is an error that occurs in Safari when you read a property or call a method on an undefined object. You can test this very easily in the Safari Developer Console. This is essentially the same as the above error for Chrome, but Safari uses a different error message.

3. TypeError: Null Is Not an Object (evaluating...)

This is an error that occurs in Safari when you read a property or call a method on a null object. You can test this very easily in the Safari Developer Console.

Interestingly, in JavaScript, null and undefined are not the same, which is why we see two different error messages. Undefined is usually a variable that has not been assigned, while null means the value is blank. To verify they are not equal, try using the strict equality operator:

One way this error might occur in a real-world example is if you try using a DOM element in your JavaScript before the element is loaded. That’s because the DOM API returns null for object references that are blank.

Any JS code that executes and deals with DOM elements should execute after the DOM elements have been created. JS code is interpreted from top to down as laid out in the HTML. So, if there is a tag before the DOM elements, the JS code within the script tag will execute as the browser parses the HTML page. You will get this error if the DOM elements have not been created before loading the script.

In this example, we can resolve the issue by adding an event listener that will notify us when the page is ready. Once the addEventListener is fired, the init() method can make use of the DOM elements.

4. (unknown): Script Error

The Script error occurs when an uncaught JavaScript error crosses domain boundaries in violation of the cross-origin policy. For example, if you host your JavaScript code on a CDN, any uncaught errors (errors that bubble up to the window.onerror handler, instead of being caught in try-catch) will get reported as simply "Script error" instead of containing useful information. This is a browser security measure intended to prevent passing data across domains that otherwise wouldn’t be allowed to communicate.

To get the real error messages, do the following:

1. Send the Access-Control-Allow-Origin header

Setting the Access-Control-Allow-Origin header to * signifies that the resource can be accessed properly from any domain. You can replace * with your domain if necessary: for example, Access-Control-Allow-Origin: www.example.com. However, handling multiple domains gets tricky, and may not be worth the effort if you’re using a CDN due to caching issues that may arise. See more here.

Here are some examples of how to set this header in various environments:

Apache

In the folders where your JavaScript files will be served from, create an .htaccess file with the following contents:

Nginx

Add the add_header directive to the location block that serves your JavaScript files:

HAProxy

Add the following to your asset backend where JavaScript files are served from:

2. Set crossorigin="anonymous" on the script tag

In your HTML source, for each of the scripts that you’ve set the Access-Control-Allow-Origin header for, set crossorigin="anonymous" on the SCRIPT tag. Make sure you verify that the header is being sent for the script file before adding the crossorigin property to the script tag. In Firefox, if the crossorigin attribute is present but the Access-Control-Allow-Origin header is not, the script won’t be executed.

5. TypeError: Object Doesn’t Support Property

This is an error that occurs in IE when you call an undefined method. You can test this in the IE Developer Console.

This is equivalent to the error "TypeError: ‘undefined’ is not a function" in Chrome. Yes, different browsers can have different error messages for the same logical error.

This is a common problem for IE in web applications that employ JavaScript namespacing. When this is the case, the problem 99.9% of the time is IE’s inability to bind methods within the current namespace to the this keyword. For example, if you have the JS namespace Rollbar with the method isAwesome. Normally, if you are within the Rollbar namespace you can invoke the isAwesome method with the following syntax:

Chrome, Firefox, and Opera will happily accept this syntax. IE, on the other hand, will not. Thus, the safest bet when using JS namespacing is to always prefix with the actual namespace.

6. TypeError: ‘undefined’ Is Not a Function

This is an error that occurs in Chrome when you call an undefined function. You can test this in the Chrome Developer Console and Mozilla Firefox Developer Console.

As JavaScript coding techniques and design patterns have become increasingly sophisticated over the years, there’s been a corresponding increase in the proliferation of self-referencing scopes within callbacks and closures, which are a fairly common source of this/that confusion.

Consider this example code snippet:

Executing the above code results in the following error: "Uncaught TypeError: undefined is not a function." The reason you get the above error is that when you invoke setTimeout(), you are actually invoking window.setTimeout(). As a result, an anonymous function being passed to setTimeout() is being defined in the context of the window object, which has no clearBoard() method.

A traditional, old-browser-compliant solution is to simply save your reference to this in a variable that can then be inherited by the closure. For example:

Alternatively, in the newer browsers, you can use the bind() method to pass the proper reference:

7. Uncaught RangeError: Maximum Call Stack

This is an error that occurs in Chrome under a couple of circumstances. One is when you call a recursive function that does not terminate. You can test this in the Chrome Developer Console.

It may also happen if you pass a value to a function that is out of range. Many functions accept only a specific range of numbers for their input values. For example, Number.toExponential(digits) and Number.toFixed(digits) accept digits from 0 to 20, and Number.toPrecision(digits) accepts digits from 1 to 21.

8. TypeError: Cannot Read Property ‘length’

This is an error that occurs in Chrome because of reading length property for an undefined variable. You can test this in the Chrome Developer Console.

You normally find length defined on an array, but you might run into this error if the array is not initialized or if the variable name is hidden in another context. Let’s understand this error with the following example.

When you declare a function with parameters, these parameters become local ones. This means that even if you have variables with names testArray, parameters with the same names within a function will still be treated as local.

You have two ways to resolve your issue:

Remove parameters in the function declaration statement (it turns out you want to access those variables that are declared outside of the function, so you don’t need parameters for your function):

Invoke the function passing it the array that we declared:

9. Uncaught TypeError: Cannot Set Property

When we try to access an undefined variable it always returns undefined and we cannot get or set any property of undefined. In that case, an application will throw “Uncaught TypeError cannot set property of undefined.”

For example, in the Chrome browser:

If the test object does not exist, the error will throw “Uncaught TypeError cannot set property of undefined.”

10. ReferenceError: Event Is Not Defined

This error is thrown when you try to access a variable that is undefined or is outside the current scope. You can test it very easily in Chrome browser.

If you’re getting this error when using the event handling system, make sure you use the event object passed in as a parameter. Older browsers like IE offer a global variable event, but it's not supported on all browsers. Libraries like jQuery attempt to normalize this behavior. Nevertheless, it’s best practice to use the one passed into your event handler function.

Conclusion

We hope you learned something new and can avoid errors in the future, or that this guide helped you solve a head-scratcher. Nevertheless, even with the best practices, unexpected errors do pop up in production. It's important to have visibility into errors that affect your users and to have good tools to solve them quickly.

 This article was originally published on Rollbar's blog.

via DZone Web Dev Zone http://ift.tt/2DYa4Xl

[programmingbiters-blog]

New Post has been published on http://programmingbiters.com/laravel-jwt-auth-with-vue-js-2-3/

Laravel JWT Auth with Vue.js 2

Sign in Form

Add the following code to the Signin.vue file.

Signin.vue

<template> <div> <div class="alert alert-danger" v-if="error"> <p>There was an error, unable to sign in with those credentials.</p> </div> <form autocomplete="off" v-on:submit="signin"> <div class="form-group"> <label for="email">E-mail</label> <input type="email" id="email" class="form-control" placeholder="gavin.belson@hooli.com" v-model="email" required> </div> <div class="form-group"> <label for="password">Password</label> <input type="password" id="password" class="form-control" v-model="password" required> </div> <button type="submit" class="btn btn-default">Sign in</button> </form> </div> </template> <script> import auth from '../js/auth.js'; export default data() return email: null, password: null, error: false , methods: signin(event) event.preventDefault() auth.signin(this, this.email, this.password) </script>

Dashboard

Add the following code to the Dashboard.vue file. This template populates the router-view element in the base layout component when the user is authenticated.

Dashboard.vue

<template> <h1>Laravel 5 - Dashboard</h1> </template>

Update auth.js to handle all of the authorization functions.

Note the changes between version 1.0 of auth.js. For consistency with the HTML5 history API, router.go is now only used for back/forward navigation. Therefore, router.push replaces router.go in this use case.

auth.js

... export default user: authenticated: false, profile: null , check() let token = localStorage.getItem('id_token') if (token !== null) Vue.http.get( 'api/user?token=' + token, ).then(response => this.user.authenticated = true this.user.profile = response.data.data ) , register(context, name, email, password) Vue.http.post( 'api/register', name: name, email: email, password: password ).then(response => context.success = true , response => context.response = response.data context.error = true ) , signin(context, email, password) Vue.http.post( 'api/signin', email: email, password: password ).then(response => context.error = false localStorage.setItem('id_token', response.data.meta.token) Vue.http.headers.common['Authorization'] = 'Bearer ' + localStorage.getItem('id_token') this.user.authenticated = true this.user.profile = response.data.data router.push( name: 'dashboard' ) , response => context.error = true ) , signout() localStorage.removeItem('id_token') this.user.authenticated = false this.user.profile = null router.push( name: 'home' )

Update the VueRouter routes array in app.js to include the Dashboard and Signin components.

app.js

... export var router = new VueRouter( routes: [ path: '/', name: 'home', component: Home , path: '/dashboard', name: 'dashboard', component: Dashboard , path: '/register', name: 'register', component: Register , path: '/signin', name: 'signin', component: Signin ] ); ...

Finishing Touches

1. Update the App.vue navigation inside the nav so the Register link is only available when applicable. Add a Sign in and Sign out link along with a list item to show the users name when signed in.

2. At the bottom of the App.vue file add a script to bind the auth.js methods.

Note the ready function in version 1.0 of App.vue has been replaced with the mounted hook.

App.vue

... <nav> <ul class="list-inline"> <li> <router-link :to=" name: 'home' ">Home</router-link> </li> <li class="pull-right" v-if="!auth.user.authenticated"> <router-link :to=" name: 'register' ">Register</router-link> </li> <li class="pull-right" v-if="!auth.user.authenticated"> <router-link :to=" name: 'signin' ">Sign in</router-link> </li> <li class="pull-right" v-if="auth.user.authenticated"> <a href="javascript:void(0)" v-on:click="signout">Sign out</a> </li> <li class="pull-right" v-if="auth.user.authenticated"> Hi, auth.user.profile.name </li> </ul> </nav> ... <script> import auth from '../js/auth.js' export default data() return auth: auth , methods: signout() auth.signout() , mounted: function () this.$nextTick(function () auth.check() ) </script>

Run the npm build script and give it a test drive.

npm run build

Used in this build:

Laravel 5.2

JWT Auth v0.5.9

Vue v2.1.1

Vue-cli v2.8.1

Vue-resource v1.2.0

Vue-router v2.1.1

Webpack v2.2.0

 Source Code

[laravelvuejs]

#5 User Input & Data Binding With v-model – VueJS For Everyone In this series, we dive into VueJS. I teach you all about the basics of Vue app development where we dive into VueJS fundamentals, VueJS Animations, API calls ... source

[lewiskdavid90]

95% off #Vue JS 2 – The Complete Guide (incl. Vuex) – $10

VueJS is an awesome JavaScript Framework for building Frontend Applications! Vue.js mixes the Best of Angular 2 + React!

All Levels,  – 16.5 hours,  328 lectures 

Average rating 4.8/5 (4.8 (998 ratings) Instead of using a simple lifetime average, Udemy calculates a course’s star rating by considering a number of different factors such as the number of ratings, the age of ratings, and the likelihood of fraudulent ratings.)

Course requirements:

Basic JavaScript Knowledge is Required ES6 Knowledge is a Plus but not a Must Basic HTML and CSS Knowledge is assumed throughout the Course

Course description:

No matter at which Metric you look (Google Trends, Github Stars, Tweets …) VueJS is the Shooting Star in the World of JavaScript Frameworks – it simply is amazing!

Frontend Frameworks are extremely popular because they give us this reactive, great User Experience we know from Mobile Apps – but now in the Browser! No wonder that Jobs requiring Frontend Framework Skills like VueJS are amongst the best paid ones in the Industry!

You may know Angular 2 and ReactJS, well, VueJS combines the Best of both Frameworks and makes building anything from small Widgets to big, Enterprise-Level Apps a Breeze and a whole lot of Fun! And if you don’t know the two mentioned Frameworks: That’s fine, too, this Course does not expect any knowledge of any other Frontend Framework – you will learn it all throughout this Course!

### This Course covers it all! ###

We’ll start at the very Basics, what Vue.js is and how it works before we move on to more Complex and Advanced Topics but I’ll be honest: It’s too much to fit it all into one Sentence, so here’s what you’ll learn in this Course:

What is VueJS and Why would you use it? Setting up a Development Environment and Workflow The Basics (including the basic Syntax, Understanding Templates and much more!) Interacting with DOM (Rendering Lists, Conditionally attaching/ detaching Elements …) Using Components (and what Components are to begin with) Binding to Form Inputs All about Directives, Filters and Mixins How to make your App more Beautiful with Animations and Transitions How to create an awesome Single-Page-Application (SPA) with Routing How to improve State Management by using Vuex How to Deploy the App And much more …

And all the accompanied with many Exercises and multiple Course Projects – because it isn’t just about seeing Code, it’s about using and practicing it!

### Is this Course for you? ###

Now that you know what this Course is about, let’s see if this Course is for you!

Here are three Types of Students who will love this Course:

Student #1:

Has some JavaScript Experience and is interested in what this Language can do. He heard and read that JavaScript allows you to create nice Web Applications and enhance existing Web Pages. VueJS is your choice!

Student #2:

He already has some Experience with other Frontend Frameworks like Angular (2) or ReactJS. But either due to interest or disappointment of the existing Frameworks, he seeks some Alternatives – VueJS might be what you were looking for! 

Student #3:

Has Experience with backend Frameworks/ Languages but now also wants to enter the Frontend World. VueJS is an awesome choice here, it’s fun, it uses native JS and it’s extremely powerful!

Bonus: Student #4

Is disappointed by Angular 2. Does a good Framework need 2 hours of setup? No, certainly not – as VueJS will prove to this Student!

Let’s dive into VueJS right now!

Full details Build amazing Vue.js Applications – all the Way from Small and Simple Ones up to Large Enterprise-level Ones Understand the Theory behind Vue.js and use it in Real Projects Leverage Vue.js in both Multi- and Single-Page-Applications (MPAs and SPAs) This Course is for Everyone interested in Frontend Development and Major JavaScript Frameworks This Course is for you if you want to create Reactive Applications, which run in the Browser This Course also targets Students who prefer a native JavaScript Framework which makes Getting Started much simpler than Angular 2 Displeased with Angular 2? VueJS is for you!

Full details

Reviews:

“Max did a great job structuring this course. I would have spent tons of hours, if not months, trying to learn this on my own. He teaches you all the way through from understanding to deploying. I’m so glad he covered deployment (but not in depth — would be awesome if he could though). Money well spent! The exercises really help enforced my learning. Thanks Max!” (Sam)

“Clear and well paced. This course allowed me to fill in some gaps in my own learning and helped reinforce some of the key principles. Max is a natural teacher and his enthusiasm for the subject matter shines through.” (Simon Patis)

“For Vue.js beginners: the course starts slow, but it will show you mostly everything . It covers everything you need to get started yourself. One of the last courses will put your skills to the test in a demo application. Sometimes the examples are not practical. For beginners, it can be hard to understand if the example code is not related to the issue. I would give 5 stars instead of 4.5 if the examples were more related. That being said, if you have worked with JavaScript before, you will be able to understand it. Also, Maximilian is enthusiastic and positive throughout the course. Which helps a lot.” (StevenW W)

  About Instructor:

Maximilian Schwarzmüller

Experience as Web Developer Starting out at the age of 13 I never stopped learning new programming skills and languages. Early I started creating websites for friends and just for fun as well. This passion has since lasted and lead to my decision of working as a freelance web developer and consultant. The success and fun I have in this job is immense and really keeps that passion burningly alive. Starting web development on the backend (PHP with Laravel, NodeJS) I also became more and more of a frontend developer using modern frameworks like Angular 2 or VueJS 2 in a lot of projects. I love both world nowadays! As a self-taught developer I had the chance to broaden my horizon by studying Business Administration where I hold a Master’s degree. That enabled me to work in a major strategy consultancy as well as a bank. While learning, that I enjoy development more than these fields, the time in this sector greatly improved my overall experience and skills. Experience as Instructor As a self-taught professional I really know the hard parts and the difficult topics when learning new or improving on already-known languages. This background and experience enables me to focus on the most relevant key concepts and topics. My track record of many 5-star rated courses as well as a successful YouTube channel is the best proof for that. Whether working as development instructor or teaching Business Administration I always received great feedback. The most rewarding experience is to see how people find new, better jobs, build awesome web applications, acquire amazing projects or simply enjoy their hobby with the help of my content.

Instructor Other Courses:

Angular 2 verstehen und anwenden Maximilian Schwarzmüller, Professional Web Developer and Instructor (77) $10 $150 Understanding TypeScript Accelerated ES6 JavaScript Training …………………………………………………………… Maximilian Schwarzmüller coupons Development course coupon Udemy Development course coupon Web Development course coupon Udemy Web Development course coupon Vue JS 2 – The Complete Guide (incl. Vuex) Vue JS 2 – The Complete Guide (incl. Vuex) course coupon Vue JS 2 – The Complete Guide (incl. Vuex) coupon coupons

The post 95% off #Vue JS 2 – The Complete Guide (incl. Vuex) – $10 appeared first on Udemy Cupón/ Udemy Coupon/.

from Udemy Cupón/ Udemy Coupon/ http://coursetag.com/udemy/coupon/95-off-vue-js-2-the-complete-guide-incl-vuex-10/ from Course Tag https://coursetagcom.tumblr.com/post/155339390133

[rafi1228]

Build real web apps with Vuex, Router, Node! Master Vue Js and Vue JS 2!

What you’ll learn

Develop powerful, modern, real-world web applications with Vue JS 2 and Node

Completely understand the processes and concepts of Vue JS 2

Use gained knowledge to create your own Web Applications

Become fluent in concepts and tools like Vuex, MongoDb, Sockets, Authentication

Requirements

No previous Vue JS knowledge is required!

A basic understanding of Javascript / ES6 knowledge is needed

Basic Node JS knowledge (or Server Lessons are skippable)

Fundamentals in HTML and CSS helpful, but not a ‘must have’

Description

WHAT IS VUE JS?

Vue JS is a very popular JavaScript front-end framework that was designed specifically to help you write Web apps faster and more easily than ever before!

Used by companies such as Nintendo, Adobe, GitLab, Baidu and Alibaba, Vue JS is rapidly increasing in popularity, so it’s a great time to add it to your CV.

By the end of this course you’ll have the skills and confidence you need to use Vue JS on your own projects!

So, no matter whether you’re a complete beginner to Vue JS, or an experienced programmer keen to improve your skills, this course is for you!

THE COURSE

Students learn best when they’re putting what they learn in to practice straight away, so we’ve build this course around two really great projects (which will look fantastic in your career portfolio!):

Project 1 – Activity Planner app

In this opening project students build their own activity planner web app! It’s a brilliant introduction to the basic concepts of the Vue JS framework, and by the end you’ll:

Have learnt how to create Vue components, data and methods

Know how to create store data into our browser Local Storage.

Fully understand Vue JS concepts like data binding, data manipulation, event handling, state management (and much more!)

Project 2 – VueMeetuper app

A much more difficult project, but one you’ll be proud of completing! Here students take a big step up and build an incredibly functional online meet up web app. Your app will let you make and join various Meetups, create editable threads and dedicated posts, register and authenticate users, build a user profile page and get your location! After doing all that, students will:

Be able to manage authentication with JWT (json web tokens) and Session Authentication on the client/server side.

Understand forms in JS – including how to integrate and validate plugins, how to use interactive (wizard) forms and how to integrate Datepicker and Timepicker inputs.

Create a chat-like functionality using the Socket library (a JS library for realtime web applications) – including real-time page updates!

Be able to to get location from IP address and use this location to improve user experience!

And much more!

With over 31 hours of on-screen instruction, it doesn’t matter whether you’re planning to start your career as a developer, or just want to improve your programming skills, this is the right course for you!

So what are you waiting for? Enrol now!!

NOTE: Some basic understanding of JavaScript and Node framework recommended (but very basic is fine!) as at one point we switch from our frontend application to our backend Node.js application. HOWEVER(!) the Node sections are completely optional, and you are able to download server code and work only on Vue JS Application.

Who this course is for:

Beginners new to Vue JS/JS 2

This course is for everyone eager to understand how a javascript frameworks work.

People eager to learn new knowledge

Experienced developers looking to hone their Vue JS/JS 2 skills

Created by Filip Jerga, Codestars by Rob Percival, Rob Percival Last updated 7/2019 English English [Auto-generated]

Size: 17.56 GB

   Download Now

https://ift.tt/32Ro7GG.

The post The Complete Vue JS Developer Course – inc. Vue JS 2! appeared first on Free Course Lab.

[rafi1228]

Vue JS is an awesome JavaScript Framework for building Frontend Applications! VueJS mixes the Best of Angular + React!

What you’ll learn

Build amazing Vue.js Applications – all the Way from Small and Simple Ones up to Large Enterprise-level Ones

Understand the Theory behind Vue.js and use it in Real Projects

Leverage Vue.js in both Multi- and Single-Page-Applications (MPAs and SPAs)

Requirements

Basic JavaScript Knowledge is Required

ES6 Knowledge is a Plus but not a Must

Basic HTML and CSS Knowledge is assumed throughout the Course

Description

Hear what students are saying about the course:

He knows how to teach. Splits every details into smaller parts and makes another video for each part. For this reason you don’t feel yourself boring while watching videos because lots of them about 2-3 mins not more. One of the best teachers in Udemy that I saw.

The instructor uses an easy-to-follow approach that builds knowledge easily and incrementally.

Very well laid out tutorials that are easy to follow but also run at a pace that doesn’t get boring.

About the course

No matter at which Metric you look (Google Trends, Github Stars, Tweets …) VueJS is the Shooting Star in the World of JavaScript Frameworks – it simply is amazing!

Frontend Frameworks are extremely popular because they give us this reactive, great User Experience we know from Mobile Apps – but now in the Browser! No wonder that Jobs requiring Frontend Framework Skills like VueJS are amongst the best paid ones in the Industry!

You may know Angular 2 and ReactJS, well, VueJS combines the Best of both Frameworks and makes building anything from small Widgets to big, Enterprise-Level Apps a Breeze and a whole lot of Fun! And if you don’t know the two mentioned Frameworks: That’s fine, too, this Course does not expect any knowledge of any other Frontend Framework – you will learn it all throughout this Course!

### This Course covers it all! ###

We’ll start at the very Basics, what Vue.js is and how it works before we move on to more Complex and Advanced Topics but I’ll be honest: It’s too much to fit it all into one Sentence, so here’s what you’ll learn in this Course:

What is VueJS and Why would you use it?

Setting up a Development Environment and Workflow

The Basics (including the basic Syntax, Understanding Templates and much more!)

Interacting with DOM (Rendering Lists, Conditionally attaching/ detaching Elements …)

Using Components (and what Components are to begin with)

Binding to Form Inputs

All about Directives, Filters and Mixins

How to make your App more Beautiful with Animations and Transitions

How to create an awesome Single-Page-Application (SPA) with Routing

How to improve State Management by using Vuex

How to Deploy the App

And much more …

And all the accompanied with many Exercises and multiple Course Projects – because it isn’t just about seeing Code, it’s about using and practicing it!

### Is this Course for you? ###

Now that you know what this Course is about, let’s see if this Course is for you!

Here are three Types of Students who will love this Course:

Student #1:

Has some JavaScript Experience and is interested in what this Language can do. He heard and read that JavaScript allows you to create nice Web Applications and enhance existing Web Pages. VueJS is your choice!

Student #2:

He already has some Experience with other Frontend Frameworks like Angular (2) or ReactJS. But either due to interest or disappointment of the existing Frameworks, he seeks some Alternatives – VueJS might be what you were looking for!

Student #3:

Has Experience with backend Frameworks/ Languages but now also wants to enter the Frontend World. VueJS is an awesome choice here, it’s fun, it uses native JS and it’s extremely powerful!

Bonus: Student #4

Is disappointed by Angular 2. Does a good Framework need 2 hours of setup? No, certainly not – as VueJS will prove to this Student!

Let’s dive into VueJS right now!

Who this course is for:

This Course is for Everyone interested in Frontend Development and Major JavaScript Frameworks

This Course is for you if you want to create Reactive Applications, which run in the Browser

This Course also targets Students who prefer a native JavaScript Framework which makes Getting Started much simpler than Angular 2

Displeased with Angular 2? VueJS is for you!

Created by Maximilian Schwarzmüller Last updated 11/2018 English English

Size: 4.80 GB

   Download Now

https://ift.tt/2eydV0z.

The post Vue JS 2 – The Complete Guide (incl. Vue Router & Vuex) appeared first on Free Course Lab.

[rafi1228]

Build real web apps with Vuex, Router, Node! Master Vue Js and Vue JS 2!

What you’ll learn

Develop powerful, modern, real-world web applications with Vue JS 2 and Node

Completely understand the processes and concepts of Vue JS 2

Use gained knowledge to create your own Web Applications

Become fluent in concepts and tools like Vuex, MongoDb, Sockets, Authentication

Requirements

No previous Vue JS knowledge is required!

A basic understanding of Javascript / ES6 knowledge is needed

Basic Node JS knowledge (or Server Lessons are skippable)

Fundamentals in HTML and CSS helpful, but not a ‘must have’

Description

WHAT IS VUE JS?

Vue JS is a very popular JavaScript front-end framework that was designed specifically to help you write Web apps faster and more easily than ever before!

Used by companies such as Nintendo, Adobe, GitLab, Baidu and Alibaba, Vue JS is rapidly increasing in popularity, so it’s a great time to add it to your CV.

By the end of this course you’ll have the skills and confidence you need to use Vue JS on your own projects!

So, no matter whether you’re a complete beginner to Vue JS, or an experienced programmer keen to improve your skills, this course is for you!

THE COURSE

Students learn best when they’re putting what they learn in to practice straight away, so we’ve build this course around two really great projects (which will look fantastic in your career portfolio!):

Project 1 – Activity Planner app

In this opening project students build their own activity planner web app! It’s a brilliant introduction to the basic concepts of the Vue JS framework, and by the end you’ll:

Have learnt how to create Vue components, data and methods

Know how to create store data into our browser Local Storage.

Fully understand Vue JS concepts like data binding, data manipulation, event handling, state management (and much more!)

Project 2 – VueMeetuper app

A much more difficult project, but one you’ll be proud of completing! Here students take a big step up and build an incredibly functional online meet up web app. Your app will let you make and join various Meetups, create editable threads and dedicated posts, register and authenticate users, build a user profile page and get your location! After doing all that, students will:

Be able to manage authentication with JWT (json web tokens) and Session Authentication on the client/server side.

Understand forms in JS – including how to integrate and validate plugins, how to use interactive (wizard) forms and how to integrate Datepicker and Timepicker inputs.

Create a chat-like functionality using the Socket library (a JS library for realtime web applications) – including real-time page updates!

Be able to to get location from IP address and use this location to improve user experience!

And much more!

With over 31 hours of on-screen instruction, it doesn’t matter whether you’re planning to start your career as a developer, or just want to improve your programming skills, this is the right course for you!

So what are you waiting for? Enrol now!!

NOTE: Some basic understanding of JavaScript and Node framework recommended (but very basic is fine!) as at one point we switch from our frontend application to our backend Node.js application. HOWEVER(!) the Node sections are completely optional, and you are able to download server code and work only on Vue JS Application.

Who this course is for:

Beginners new to Vue JS/JS 2

This course is for everyone eager to understand how a javascript frameworks work.

People eager to learn new knowledge

Experienced developers looking to hone their Vue JS/JS 2 skills

Created by Filip Jerga, Codestars by Rob Percival, Rob Percival Last updated 7/2019 English English [Auto-generated]

Size: 17.56 GB

   Download Now

https://ift.tt/32Ro7GG.

The post The Complete Vue JS Developer Course – inc. Vue JS 2! appeared first on Free Course Lab.

[mbaljeetsingh]

Essential JavaScript Libraries and Frameworks You Should Know About

JavaScript has been around for 20+ years, and it's one of those languages that never stop evolving. The language has been experiencing a fast-paced growth recently that makes me wonder whether the modern front-end JavaScript technologies that are well known today will be relevant a couple of years later. 

Nevertheless, it's important to be ahead of the game by working with the latest tools and frameworks for a better development workflow. This article explores various JavaScript libraries, frameworks, and tools that you should consider learning right now.

Introduction

The JavaScript environment has grown huge. It has its own ecosystem of libraries, frameworks, tools, package managers and new languages that compile down to JavaScript. Interestingly, npm, which is the de facto package manager for JavaScript, is also the largest software registry in the world. Here is an excerpt from a post published on Linux.com back in January 2017.

At over 350,000 packages, the npm registry contains more than double the next most populated package registry (which is the Apache Maven repository). In fact, it is currently the largest package registry in the world.

Fast forward eight months, and there are currently about 500,000 packages in the npm registry. That's a massive growth compared to other package repositories. 

Source: ModuleCounts.com

As a front-end JavaScript developer, it's important to keep up with the modern JavaScript tools and libraries. When a technology becomes popular, demand for it is high, which in turn means more coding jobs that pay the highest salary in the industry. So I've assembled a list of the popular JavaScript technologies that I think you should be aware of. 

Libraries

A library is a reusable piece of code that offers certain functionality. It is a collection of functions, objects, and classes that you can use in your application. A library abstracts different layers so that you don't have to be concerned about their implementation details. 

You can call a library function and pass it some parameters, and the library executes it and returns the control back to you. However, it doesn't place any structural constraints that restrict how you use the library. Popular JavaScript libraries include:

React

React is a JavaScript library built by the developers of Facebook and Instagram. React was voted as the most-loved technology among developers, according to the Stack Overflow Survey 2017. React also holds the credit for being the most popular JavaScript project based on GitHub star count. 

So why is React getting all the attention? With React, it is possible to create an interactive UI using a declarative approach where you can control the state of the application by saying "the view should look like this". It uses a component-based model where the components are reusable UI elements and each component has its own state.

React uses a Virtual DOM so that you don't have to be concerned about directly manipulating the DOM. Other notable features of React include one-way data flow, optional JSX syntax, and a command-line tool for creating a React project with zero build configuration. 

If you believe that React is the next best thing and would like to learn React, check out our React Crash Course for Beginners tutorial series.

jQuery

jQuery is a library that made JavaScript more approachable and DOM manipulation easier than before. jQuery's gentle learning curve and easy syntax gave rise to a generation of new client-side developers. A few years back, jQuery was considered a solid solution for building robust websites with cross-browser support. jQuery's core features such as DOM manipulation based on CSS selectors, event handling, and making AJAX calls fueled its popularity. 

However, things have changed, and the JavaScript environment has steadily evolved. Some of jQuery's features have been incorporated into the newer ECMAScript specification. Moreover, the new libraries and frameworks in use today have a native way of binding the DOM, and hence plain DOM manipulation techniques are not required anymore. jQuery's popularity is on the decline, but I don't see it disappearing anytime soon.

D3: Data-Driven Documents

D3 (or D3.js) is a powerful JavaScript library for producing interactive visualizations using web standards such as SVG, HTML, and CSS. Unlike other visualization libraries, D3 offers better control over the final visual result. 

D3 works by binding the data to the DOM and then making the transformation to the document. It also has an ecosystem of its own, which consists of plugins and libraries that extend its basic functionality. The library has been around since 2011, and it has tons of documentation and tutorials that can help you get started. 

If you are looking to create simple visualizations without investing too much time in it, you should check out Chart.js. We have an introductory series on Chart.js that covers most of the visualizations that you can create with Chart.js

Frameworks

A framework has an architecture that dictates the flow of control in your application. The framework describes the skeleton and tells you how everything should be organized. The basic functionality required to get the application up and running is also provided to you. Moreover, you are bound to follow the framework's design principles and patterns. The difference between a framework and library is that you call a library, whereas the framework calls you. 

A framework often comprises of many libraries and has a higher level of abstraction. Functionality such as event handling, making AJAX calls, template and data binding, and testing are built into the framework.  

Angular

AngularJS was once the most popular JavaScript technology among front-end developers. It was backed by Google and a community of individuals and corporations. Despite the popularity, AngularJS had its own share of flaws. The Angular team spent two years working on a newer version of Angular, which was finally released in September 2016. 

The Angular 2 release was a ground-up rewrite of AngularJS. Some of the features of Angular 2 include:

TypeScript over JavaScript as the default language

component-based architecture

improved performance on both mobile and web platforms. 

better tooling and scaffolding options

However, upgrading from Angular 1.x to Angular 2 is expensive because Angular 2 is an entirely different beast. That's one of the reasons why Angular 2 hasn't experienced the same adoption rate as that of its predecessor. But Angular and AngularJS continue to be among the most commonly used technologies according to Stack Overflow (2017). The Angular project has about 28,000 stars on GitHub.

Vue.js

Vue.js is a lightweight JavaScript framework that has been trending this year. It is the most popular JavaScript framework on GitHub in terms of the GitHub star count. Vue claims to be a less opinionated framework and thus easy for developers to catch up with. Vue's HTML-based template syntax binds the rendered DOM to the instance data. 

The framework offers a React-like experience with its Virtual DOM and reusable components that you can use to create both widgets and entire web applications. Moreover, you can also use the JSX syntax to write the render functions directly.  When the state changes, Vue.js uses a reactivity system to determine what has changed and rerenders the minimal number of components. Vue.js also supports the integration of other libraries into the framework without much hassle.

Ember.js

Ember.js is a front-end framework based on the  Model-View-ViewModel (MVVM) pattern. It follows the convention over configuration approach which is popular among server-side side frameworks like Ruby on Rails and Laravel. Ember.js incorporates common idioms and best practices into the framework so that you can get an application up and running without much effort. 

The Ember stack usually comprises:

Ember CLI: Provides basic scaffolding options and supports hundreds of add-ons.

Ember Data: A data persistence library that can be configured to work with any server back end.

Ember Inspector: An extension available for Chrome and Firefox.

Liquid Fire:  An add-on for transitions and animations.

Tools

A tool is a collection of routines that help you in the development process. Unlike a library, a tool usually executes a task on the client code. It takes your code as input, performs a task on it, and then returns an output. The commonly used tools include transpilers and build tools, asset minifiers, module bundlers, and scaffolding tools. 

Tools: General-Purpose Task Runners

General-purpose task runners are the tools used to automate certain repetitive tasks. The popular general-purpose task runners include:

Gulp 

Gulp is a JavaScript toolkit used as a task runner and as a build system in web development. Compilation, code minification, image optimization, unit testing, linting etc. are repetitive tasks that should be automated. Gulp makes the process of writing tasks easier, even for people who are less familiar with JavaScript. 

Gulp uses pipelines to stream the data from one plugin to another, and the final result is outputted to a destination folder. Gulp performs better compared to Grunt because it doesn't create temporary files for storing intermediate results, which results in fewer I/O calls.

Grunt

Grunt is a task runner and an automation tool for JavaScript. Grunt has a command-line interface that lets you run custom tasks defined in a file called a Gruntfile. Grunt has thousands of plugins to choose from, which should cover most of the common repetitive tasks that you'd encounter. With Grunt, you can run all the tasks under a single command, making your life easier.

npm 

Gulp and Grunt require you to spend time learning and mastering a new tool, which takes time. Introducing additional dependencies into your project can be avoided by choosing an alternative that is already bundled with Node.js. Although npm is better known as a package manager, npm scripts can be used to perform the bulk of the abovementioned tasks. 

Tools: Testing

Testing is the process of validating and verifying that the application meets the expected business and technical requirements. The Test-Driven Development approach also aids in discovering bugs and therefore should be treated as an integral part of the modern front-end development stack.

Jest

Jest is a relatively new testing framework authored by Facebook and is well-received by the React community. There is a common misconception that Jest is specifically designed to work with React; however, according to the Jest Documentation:

Although Jest may be considered React-specific test runner, in fact it is a universal testing platform, with the ability to adapt to any JavaScript library or framework. You can use Jest to test any JavaScript code.

The biggest advantage of using Jest over other test suites is that you require zero or minimal configuration to start writing tests. The framework has a built-in assertion library and supports the use of mock functions or spies.

Jest has a feature called snapshot testing that lets you ensure that the UI of the application doesn't change unexpectedly. The developers at Facebook and other contributors have been pouring a lot of work into this project recently, so it wouldn't be a surprise if Jest turns out to be the most popular testing framework for JavaScript in the years to come.

Mocha 

Mocha is a JavaScript testing framework that features browser support, async support including promises, test coverage reports, and a JavaScript API for running tests. Mocha is often paired with an assertion library such as Chai, should.js, expect.js, or better-assert because it lacks an assertion library of its own. 

Jasmine

Jasmine is a behavior-driven testing framework for JavaScript. Jasmine aims to be a browser, platform, and framework-independent test suite. Jasmine has its own assertion library called matchers that gives it a clean and easy-to-read syntax. Jasmine doesn't have a built-in test runner, and you might have to use a generic test runner like Karma instead. 

Summary

JavaScript, the language of the web, has stayed relevant since the days of its inception back in 1995. It will probably stay that way as long as browsers don't decide to ditch it for another language. Although there are a lot of other languages that compile down to JavaScript, there is no other scripting language that will replace JavaScript in the foreseeable future. Why? Because JavaScript has grown too popular to be replaced.

The language is not without its learning curves, and there are plenty of frameworks and libraries to keep you busy, as well. If you’re looking for additional resources to study or to use in your work, check out what we have available in the Envato Market. 

The JavaScript environment is definitely evolving, which is evident from the current trends in web development. Older libraries and frameworks have been replaced with new technologies. jQuery, which was once the most favored JavaScript library, is experiencing a decline in terms of appeal, usage, and popularity. The new generation of front-end libraries, frameworks, and tools are gaining ground and getting universal acceptance. 

Adapting to the new trends in technology has benefits too. Coding jobs that require React have some of the highest salaries in the industry, with an average salary of $105,000 in the U.S. according to Stack Overflow (2016). So you need to continue learning and experimenting with the latest tools and frameworks to get the best out of JavaScript. 

If you think I've missed a JavaScript framework, library or tool that is worth mentioning, let me know through the comments. 

Further Reading

Modules, a Future Approach to JavaScript Libraries

Quiz: Choose the Right Front-End JavaScript Framework for Your Project

Learn Computer Science with JavaScript

6 Things That Make Yarn the Best JavaScript Package Manager 

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