#sessionStorage

[josegremarquez]

Almacenamiento de datos en local: guardando información en tu navegador

¿Alguna vez has deseado que una página web “recuerde” tus preferencias? ¿O quizás has querido guardar datos sin necesidad de enviarlos a un servidor? El almacenamiento local en HTML5 te permite hacer justo eso. ¿Qué es el almacenamiento local? El almacenamiento local es una característica de HTML5 que permite a las aplicaciones web guardar datos directamente en el navegador del usuario. Estos…

[search5]

Apigee의 기본 UI 변경

Apigee는 구글에 인수된 솔루션으로 API 프록시 개발을 위해 별도의 사이트가 존재한다. https://apigee.google.com 근데 구글은 이렇게 서브 도메인으로 독립되어 있는 솔루션의 UI를 GCP 콘솔로 합치려는 시도를 꾸준히 하고 있다. Apigee도 그렇다. 또 한 편으로 Apigee도 프록시 개발을 위한 화면이 Classic UI와 New UI가 있는데 각각 쓰기 좋은 부분도 있지만 확실한건 New UI가 기본값이다. 그런데 New UI에서 Class UI로 바꾸고 나서 다시 New UI를 클릭하면 GCP 콘솔로 이동해버린다… 이 상황을 해결하려면 브라우저의 LocalStorage에 ENABLE_PROXY_EDITOR_v2_BY_DEFAULT의 값을 true로 바꾸고 다시…

[saide-hossain]

Let's understand HTML

Cover these topics to complete your HTML journey.

HTML (HyperText Markup Language) is the standard language used to create web pages. Here's a comprehensive list of key topics in HTML:

1. Basics of HTML

Introduction to HTML

HTML Document Structure

HTML Tags and Elements

HTML Attributes

HTML Comments

HTML Doctype

2. HTML Text Formatting

Headings (<h1> to <h6>)

Paragraphs (<p>)

Line Breaks (<br>)

Horizontal Lines (<hr>)

Bold Text (<b>, <strong>)

Italic Text (<i>, <em>)

Underlined Text (<u>)

Superscript (<sup>) and Subscript (<sub>)

3. HTML Links

Hyperlinks (<a>)

Target Attribute

Creating Email Links

4. HTML Lists

Ordered Lists (<ol>)

Unordered Lists (<ul>)

Description Lists (<dl>)

Nesting Lists

5. HTML Tables

Table (<table>)

Table Rows (<tr>)

Table Data (<td>)

Table Headings (<th>)

Table Caption (<caption>)

Merging Cells (rowspan, colspan)

Table Borders and Styling

6. HTML Forms

Form (<form>)

Input Types (<input>)

Text Fields (<input type="text">)

Password Fields (<input type="password">)

Radio Buttons (<input type="radio">)

Checkboxes (<input type="checkbox">)

Drop-down Lists (<select>)

Textarea (<textarea>)

Buttons (<button>, <input type="submit">)

Labels (<label>)

Form Action and Method Attributes

7. HTML Media

Images (<img>)

Image Maps

Audio (<audio>)

Video (<video>)

Embedding Media (<embed>)

Object Element (<object>)

Iframes (<iframe>)

8. HTML Semantic Elements

Header (<header>)

Footer (<footer>)

Article (<article>)

Section (<section>)

Aside (<aside>)

Nav (<nav>)

Main (<main>)

Figure (<figure>), Figcaption (<figcaption>)

9. HTML5 New Elements

Canvas (<canvas>)

SVG (<svg>)

Data Attributes

Output Element (<output>)

Progress (<progress>)

Meter (<meter>)

Details (<details>)

Summary (<summary>)

10. HTML Graphics

Scalable Vector Graphics (SVG)

Canvas

Inline SVG

Path Element

11. HTML APIs

Geolocation API

Drag and Drop API

Web Storage API (localStorage and sessionStorage)

Web Workers

History API

12. HTML Entities

Character Entities

Symbol Entities

13. HTML Meta Information

Meta Tags (<meta>)

Setting Character Set (<meta charset="UTF-8">)

Responsive Web Design Meta Tag

SEO-related Meta Tags

14. HTML Best Practices

Accessibility (ARIA roles and attributes)

Semantic HTML

SEO (Search Engine Optimization) Basics

Mobile-Friendly HTML

15. HTML Integration with CSS and JavaScript

Linking CSS (<link>, <style>)

Adding JavaScript (<script>)

Inline CSS and JavaScript

External CSS and JavaScript Files

16. Advanced HTML Concepts

HTML Templates (<template>)

Custom Data Attributes (data-*)

HTML Imports (Deprecated in favor of JavaScript modules)

Web Components

These topics cover the breadth of HTML and will give you a strong foundation for web development.

Full course link for free: https://shorturl.at/igVyr

[assignmentoc]

Advanced HTML Techniques: Multimedia, APIs, and Best Practices

In the ever-evolving landscape of web development, mastering advanced HTML techniques is crucial for creating dynamic, engaging, and maintainable websites. This guide delves into embedding multimedia, leveraging HTML5 APIs, and adhering to best practices for modern HTML. Whether you're a seasoned developer or just starting, these techniques will enhance your web development skills.

HTML Techniques

Embedding Multimedia

Multimedia is an integral part of creating an engaging user experience on the web. From videos to audio files, multimedia elements can make your website more interactive and appealing.

Embedding Videos

Videos can significantly enhance the user experience by providing visual and auditory information. HTML5 introduced the <video> tag, making it easier to embed videos directly into web pages without relying on third-party plugins.

Here's how to embed a video using the <video> tag:

<video width="640" height="360" controls> <source src="video.mp4" type="video/mp4"> Your browser does not support the video tag. </video>

Attributes:

width and height: Define the dimensions of the video player.

controls: Adds play, pause, and volume controls.

autoplay: Automatically starts playing the video when the page loads. Use with caution as it can be disruptive.

loop: Replays the video continuously.

muted: Mutes the video by default.

Embedding Audio

Just like videos, audio can be embedded using the HTML5 <audio> tag. This is especially useful for music, podcasts, or any sound effects.

Example:

<audio controls> <source src="audio.mp3" type="audio/mpeg"> Your browser does not support the audio element. </audio>

Attributes:

controls: Displays audio controls.

autoplay: Starts playing audio automatically.

loop: Plays the audio in a loop.

muted: Starts the audio muted.

Using HTML5 APIs

HTML5 introduced several APIs that provide powerful new features for web developers, enabling more dynamic and interactive websites.

Geolocation API

The Geolocation API allows web applications to access users’ location information with their permission. This can be used for location-based services, such as maps or localized content.

Example:

if (navigator.geolocation) { navigator.geolocation.getCurrentPosition(showPosition); } else { console.log("Geolocation is not supported by this browser."); } function showPosition(position) { console.log("Latitude: " + position.coords.latitude + ", Longitude: " + position.coords.longitude); }

Web Storage API

The Web Storage API provides a way to store data on the client side. This includes localStorage and sessionStorage.

localStorage: Stores data with no expiration date.

sessionStorage: Stores data for the duration of the page session.

Example of using localStorage:

// Setting data localStorage.setItem('username', 'JohnDoe'); // Retrieving data var name = localStorage.getItem('username'); console.log(name);

Canvas API

The Canvas API provides a means for drawing graphics via JavaScript and the <canvas> element. It can be used for drawing shapes, creating games, or rendering complex visualizations.

Example:

<canvas id="myCanvas" width="200" height="100" style="border:1px solid #000000;"> </canvas> <script> var canvas = document.getElementById('myCanvas'); var ctx = canvas.getContext('2d'); ctx.fillStyle = '#FF0000'; ctx.fillRect(0, 0, 150, 75); </script>

HTML Techniques

Best Practices for Writing Modern, Maintainable HTML

Writing clean, maintainable HTML is essential for ensuring your code is easy to read, update, and scale. Here are some best practices to follow:

Semantic HTML

Use semantic HTML to improve code readability and accessibility. Semantic elements clearly describe their meaning in a human- and machine-readable way.

Use , , , , etc., instead of generic or elements.

Accessibility

Ensuring that websites are accessible to all users, including those with disabilities, is crucial. Follow these practices to enhance accessibility:

Use alt attributes with descriptive text for images.

Ensure sufficient color contrast between text and background.

Use ARIA (Accessible Rich Internet Applications) roles and properties where necessary.

Responsive Design

Design for a wide range of devices and screen sizes by using responsive design principles. Employ CSS media queries and flexible grid layouts to ensure your website looks good on any device.

Example of a simple media query:

@media only screen and (max-width: 600px) { body { background-color: lightblue; } }

Optimize Performance

Performance optimization is key to providing a fast and seamless user experience. Here are some tips:

Minimize HTTP requests by combining files and using CSS sprites.

Compress images and use modern formats like WebP.

Use asynchronous loading for scripts to avoid blocking rendering.

Keep HTML DRY

DRY (Don't Repeat Yourself) is a principle that helps reduce repetition and redundancy in code. Use reusable components and templates to streamline your HTML.

HTML Techniques

Conclusion

By mastering these advanced HTML techniques, you can create more interactive, efficient, and accessible websites. Embedding multimedia, leveraging HTML5 APIs, and adhering to best practices will set you apart as a skilled web developer. Continue exploring new technologies and refining your skills to keep up with the ever-changing world of web development.

FAQs

What is the difference between localStorage and sessionStorage?

localStorage stores data with no expiration date, while sessionStorage stores data only for the duration of the page session. This means data in sessionStorage is cleared when the page session ends.

How can I ensure my website is accessible to users with disabilities?

Use semantic HTML, provide alt attributes for images, ensure good color contrast, and utilize ARIA roles and properties to enhance accessibility.

What are some best practices for optimizing website performance?

Minimize HTTP requests, compress images, use modern image formats like WebP, and load scripts asynchronously to optimize performance.

Why should I use semantic HTML elements instead of generic ones like <div>?

Semantic elements provide meaning and context to the content, improving both accessibility and SEO by making it easier for search engines and assistive technologies to understand your content.

How can I make my website responsive?

Use CSS media queries and flexible grid layouts to ensure your website adapts to different screen sizes and devices, providing a seamless experience across all platforms.

[idiosys-tech]

Progressive Web App - The Future of Web Development

We all have been using applications in our mobile devices on a daily basis. These are also known as native apps that we download and install from app directories like Google Play Store and App Store. While these are in the mainstream of our application uses, Progressive Web Apps (PWA) are changing the way we use applications.

What is Progressive Web App?

Progressive Web Apps are webpages, built with common designing languages like HTML, JAVASCRIPT, CSS and have the capabilities and functionalities like native apps and much more. While web applications have been in use for a long time, they lacked offline working ability, direct hardware access and had inferior functionalities than native apps in terms of speed and user experience. Starting from 2015, Google increased its focus on developing progressive web apps in android with new functionalities namely service workers and web app manifests, supported by continually developed web browsers that helped the web applications transformed into PWAs in their present OS. And after Apple started supporting Service Worker in Safari from 2017, Progressive Web Apps were supported by two of the most widely used OS i.e iOS and Android. From the viewpoint of a user, these progressive web apps have less application size leading to lesser loading time, more user interaction and engagement.

While PWAs have better user experience for the audience, for the field of App developmentand the web developers these had a monumental effect. Earlier an App development company had to build the app separately for separate OSs. With the use of Progressive Web Apps, they now have to build a single web app that will be supported by most modern browsers.

If you're planning to build a scalable PWA for your business, collaborating with idiosys Tech, a web application development agency in Kolkata can offer better turnaround time and localized support.

Technologies Involved

Two technologies create the baseline of All PWAs and are core to its development. A Service worker is a code written in javascript that works like a proxy from the client side which pre caches resources and responds to resource requests accordingly which enable the application to load instantaneously even in low or no network conditions. And a web manifest works in the User interface side enabling the user to control home screen icon, default page, screen ratio, and fullscreen uses.

Other technologies include :

Webstorage: It enables storage function in browsers. It has two components i.e sessionStorage that stores data during a session and deletes upon closure of the session and localStorage which stores data locally irrespective of sessions.

WebAssembly: Has the potential of running codes in web browsers in speed identical to native apps, but due to limitation of transferring data from Javascript to WebAssembly, it is mainly used in recognizing voice and computer vision.

Database libraries: Indexed database API, PouchDB, RXdb, GunDB, Hood.ie are the most common and advanced database libraries that can be used server-side, or even in the absence of database and backend.

These tools are often well-understood by experienced teams at any leading web application development company in Kolkata, who know how to use them to create high-performing solutions.

Features of Progressive Web Apps

Progressive web apps work on browsers that are built in accordance with Web Standards. Due to the uniformity of most web browsers, to hire app developer for a progressive Web App is now beneficial in terms of cost, time to develop and usability. As Google developers started focusing first heavily on PWAs (though Mozilla worked on PWAs earlier, their development stopped in 2016), they developed the guidelines of PWAs.

Some more modern PWAs use an architectural model. This is called App Shell model, which houses the basic UI (shell) in browsers offline cache enabled by service worker. This model makes the PWAs run like native apps even without any network connectivity making them load faster and providing them with an architecture to store content into dynamically.

Is it really the future of web development?

Though Progressive Web App development is still in its nascent phase, it has the potential to change the Web development industry in a mammoth way. It still has some limitations such as :

PWAs are not supported standardly in every Web Browser

PWAs can't use all the features a native app can use such as bluetooth

In case of UI and UX, they still lag behind native apps

It is difficult, if not impossible to monetize PWAs

Still, with use of PWAs, AliExpress increased new user conversion by more than 100% in all browsers. Evidently, advantages trump the shortcomings of Progressive Web Apps by a far margin and in days to come, with more advancement of PWAs, they surely can replace native apps.

Hire App developer to get outstanding services in progressive app development. We, Idiosys Technologies, are one of the eminent companies providing web development services. Our clients from the overseas prefer us when it comes to app development and design. To know more, feel free to call us.

You May Also Read

How to Craft a Progressive Web App (PWA)

PWA vs. Native App: A Comprehensive Guide for Business Success

[techsoundwave]

Как использовать кэширование для улучшения производительности веб-приложений?

При разработке веб-приложений и создании сайтов я всегда сталкиваюсь с одной и той же задачей — как сделать так, чтобы приложение было быстрым, отзывчивым и эффективно использовало ресурсы. Один из самых мощных инструментов для этого — кэширование.

Кэширование — это процесс хранения данных в специально отведённом месте (кэше), чтобы повторно не запрашивать их каждый раз из основного источника. В контексте создания сайтов и разработки приложений правильное использование кэширования может значительно повысить скорость работы и снизить нагрузку на сервер.

В этой статье я расскажу, как кэширование помогает улучшить производительность веб-приложений, и как его можно использовать в реальных проектах.

1. Что такое кэширование и зачем оно нужно?

Кэширование — это сохранение результата запроса (например, данных или веб-страницы) в промежуточной памяти (кэше). Когда данные повторно запрашиваются, они извлекаются из кэша, а не из основного источника (например, базы данных или внешнего API), что существенно ускоряет работу приложения.

Представьте, что каждый раз при посещении веб-страницы пользователю нужно загружать все изображения, стили и скрипты заново. Это приводит к большому времени загрузки страницы и большому расходу трафика. Кэширование позволяет хранить эти ресурсы локально, ускоряя работу приложения.

2. Виды кэширования: какой выбрать?

В зависимости от потребностей приложения можно выбрать разные виды кэширования:

Кэширование на стороне клиента (например, через LocalStorage, SessionStorage или кэш браузера). Это идеально подходит для хранения статических ресурсов (изображений, стилей, скриптов).

Кэширование на стороне сервера (например, через Redis или Memcached). Это даёт возможность хранить результаты часто выполняемых запросов или сессий пользователей, что значительно уменьшает нагрузку на базу данных.

Кэширование CDN (Content Delivery Network). Использование сетей доставки контента помогает разместить статические файлы ближе к пользователю, сокращая время загрузки.

3. Как кэширование помогает в производительности?

Уменьшение времени загрузки: Кэширование позволяет сократить время, необходимое для загрузки данных и ресурсов, так как повторные запросы могут быть обслужены быстрее. Это критично для веб-приложений и мобильных приложений, где пользователи ожидают быстрой реакции.

Снижение нагрузки на сервер: С помощью кэширования можно значительно уменьшить количество запросов к серверу и базе данных. Если данные уже есть в кэше, приложение может их извлечь без обращения к серверу, что позволяет разгрузить инфраструктуру и повысить стабильность.

Экономия трафика: При кэшировании статических ресурсов, таких как изображения и скрипты, можно значительно снизить объём данных, которые передаются между сервером и клиентом.

4. Как правильно настроить кэширование в веб-приложении?

Выбор данных для кэширования: Не все данные должны кэшироваться. Лучше всего кэшировать данные, которые часто запрашиваются, но редко изменяются. Это могут быть, например, профили пользователей, новости или продукты интернет-магазина.

Настройка времени жизни кэша (TTL): Важно настроить правильное время жизни кэша (Time To Live). Если данные меняются очень часто, их стоит кэшировать на короткий срок. Если данные меняются реже, можно задать более длительный TTL.

Обновление кэша: Нужно продумать стратегию обновления кэша. Это может быть либо автоматическое обновление через определённые интервалы, либо принудительное сбрасывание кэша при изменении данных.

5. Пример: как я использую кэширование в мобильных приложениях

В одном из проектов, над которым я работаю в стартапе, мы разрабатываем мобильное приложение для онлайн-магазина. Используя кэширование, мы смогли ускорить загрузку страниц с продуктами. Когда пользователь открывает страницу с товаром, информация о продукте и изображения кэшируются в памяти устройства. Таким образом, если пользователь вернётся на эту страницу, все данные подгружаются мгновенно, без необходимости запрашивать их с сервера.

Кэширование — это один из самых эффективных способов улучшить производительность веб-приложений и мобильных приложений. Оно снижает нагрузку на серверы, уменьшает время отклика и делает приложения быстрее и удобнее для пользователей. Важно правильно выбрать тип кэширования и грамотно настроить его для каждого конкретного случая.

В процессе разработки и создания сайтов кэширование становится неотъемлемой частью, которая помогает создать высокоскоростное и высокоэффективное приложение.

[bazgard]

چگونه می‌توانیم از Web Storage (مثل LocalStorage و SessionStorage) استفاده کنیم؟ http://dlvr.it/TJzqyv

[minimanias]

Flexpeak - Front e Back - Opções

Módulo 1 - Revisão de JavaScript e Fundamentos do Backend: • Revisão de JavaScript: Fundamentos • Variáveis e Tipos de Dados (let, const, var) • Estruturas de Controle (if, switch, for, while) • Funções (function, arrow functions, callbacks) • Manipulação de Arrays e Objetos (map, filter, reduce) • Introdução a Promises e Async/Await • Revisão de JavaScript: Programação Assíncrona e Módulos • Promises e Async/Await na prática Módulo 2 – Controle de Versão com Git / GitHub • O que é controle de versão e por que usá-lo? • Diferença entre Git (local) e GitHub (remoto) • Instalação e configuração inicial (git config) • Repositório e inicialização (git init) • Staging e commits (git add, git commit) • Histórico de commits (git log) • Atualização do repositório (git pull, git push) • Clonagem de repositório (git clone) • Criando um repositório no GitHub e conectando ao repositório local • Adicionando e confirmando mudanças (git commit -m "mensagem") • Enviando código para o repositório remoto (git push origin main) • O que são commits semânticos e por que usá-los? • Estrutura de um commit semântico: • Tipos comuns de commits semânticos(feat, fix, docs, style, refactor, test, chore) • Criando e alternando entre branches (git branch, git checkout -b) • Trabalhando com múltiplos branches • Fazendo merges entre branches (git merge)  • Resolução de conflitos • Criando um Pull Request no GitHub Módulo 3 – Desenvolvimento Backend com NodeJS • O que é o Node.js e por que usá-lo? • Módulos do Node.js (require, import/export) • Uso do npm e package.json • Ambiente e Configuração com dotenv • Criando um servidor com Express.js • Uso de Middleware e Rotas • Testando endpoints com Insomnia • O que é um ORM e por que usar Sequelize? • Configuração do Sequelize (sequelize-cli) • Criando conexões com MySQL • Criando Models, Migrations e Seeds • Operações CRUD (findAll, findByPk, create, update, destroy) • Validações no Sequelize • Estruturando Controllers e Services • Introdução à autenticação com JWT • Implementação de Login e Registro • Middleware de autenticação • Proteção de rotas • Upload de arquivos com multer • Validação de arquivos enviados • Tratamento de erros com express-async-errors Módulo 4 - Desenvolvimento Frontend com React.js • O que é React.js e como funciona? • Criando um projeto com Vite ou Create React App • Estruturação do Projeto: Organização de pastas e arquivos, convenções e padrões • Criando Componentes: Componentes reutilizáveis, estruturação de layouts e boas práticas • JSX e Componentes Funcionais • Props e Estado (useState) • Comunicação pai → filho e filho → pai • Uso de useEffect para chamadas de API • Manipulação de formulários com useState • Context API para Gerenciamento de Estado • Configuração do react-router-dom • Rotas Dinâmicas e Parâmetros • Consumo de API com fetch e axios • Exibindo dados da API Node.js no frontend • Autenticação no frontend com JWT • Armazenamento de tokens (localStorage, sessionStorage) • Hooks avançados: useContext, useReducer, useMemo • Implementação de logout e proteção de rotas

Módulo 5 - Implantação na AWS • O que é AWS e como ela pode ser usada? • Criando uma instância EC2 e configurando ambiente • Instalando Node.js, MySQL na AWS • Configuração de ambiente e variáveis no servidor • Deploy da API Node.js na AWS • Deploy do Frontend React na AWS • Configuração de permissões e CORS • Conectando o frontend ao backend na AWS • Otimização e dicas de performance 

Matricular-se  

[html-tute]

HTML APIs

HTML APIs (Application Programming Interfaces) provide a way for developers to interact with web browsers to perform various tasks, such as manipulating documents, handling multimedia, or managing user input. These APIs are built into modern browsers and allow you to enhance the functionality of your web applications.

Here are some commonly used HTML APIs:

1. Geolocation API

Purpose: The Geolocation API allows you to retrieve the geographic location of the user’s device (with their permission).

Key Methods:

navigator.geolocation.getCurrentPosition(): Gets the current position of the user.

navigator.geolocation.watchPosition(): Tracks the user’s location as it changes.

Example: Getting the user’s current location.<button onclick="getLocation()">Get Location</button> <p id="location"></p><script> function getLocation() { if (navigator.geolocation) { navigator.geolocation.getCurrentPosition(showPosition); } else { document.getElementById('location').innerHTML = "Geolocation is not supported by this browser."; } } function showPosition(position) { document.getElementById('location').innerHTML = "Latitude: " + position.coords.latitude + "<br>Longitude: " + position.coords.longitude; } </script>

2. Canvas API

Purpose: The Canvas API allows for dynamic, scriptable rendering of 2D shapes and bitmap images. It’s useful for creating graphics, games, and visualizations.

Key Methods:

getContext('2d'): Returns a drawing context on the canvas, or null if the context identifier is not supported.

fillRect(x, y, width, height): Draws a filled rectangle.

clearRect(x, y, width, height): Clears the specified rectangular area, making it fully transparent.

Example: Drawing a rectangle on a canvas.<canvas id="myCanvas" width="200" height="100"></canvas><script> var canvas = document.getElementById('myCanvas'); var ctx = canvas.getContext('2d'); ctx.fillStyle = "red"; ctx.fillRect(20, 20, 150, 100); </script>

3. Drag and Drop API

Purpose: The Drag and Drop API allows you to implement drag-and-drop functionality on web pages, which can be used for things like moving elements around or uploading files.

Key Methods:

draggable: An HTML attribute that makes an element draggable.

ondragstart: Event triggered when a drag operation starts.

ondrop: Event triggered when the dragged item is dropped.

Example: Simple drag and drop.<p>Drag the image into the box:</p> <img id="drag1" src="image.jpg" draggable="true" ondragstart="drag(event)" width="200"> <div id="dropzone" ondrop="drop(event)" ondragover="allowDrop(event)" style="width:350px;height:70px;padding:10px;border:1px solid #aaaaaa;"></div><script> function allowDrop(ev) { ev.preventDefault(); } function drag(ev) { ev.dataTransfer.setData("text", ev.target.id); } function drop(ev) { ev.preventDefault(); var data = ev.dataTransfer.getData("text"); ev.target.appendChild(document.getElementById(data)); } </script>

4. Web Storage API

Purpose: The Web Storage API allows you to store data in the browser for later use. It includes localStorage for persistent data and sessionStorage for data that is cleared when the page session ends.

Key Methods:

localStorage.setItem(key, value): Stores a key/value pair.

localStorage.getItem(key): Retrieves the value for a given key.

sessionStorage.setItem(key, value): Stores data for the duration of the page session.

Example: Storing and retrieving a value using localStorage.<button onclick="storeData()">Store Data</button> <button onclick="retrieveData()">Retrieve Data</button> <p id="output"></p><script> function storeData() { localStorage.setItem("name", "John Doe"); } function retrieveData() { var name = localStorage.getItem("name"); document.getElementById("output").innerHTML = name; } </script>

5. Fetch API

Purpose: The Fetch API provides a modern, promise-based interface for making HTTP requests. It replaces older techniques like XMLHttpRequest.

Key Methods:

fetch(url): Makes a network request to the specified URL and returns a promise that resolves to the response.

Example: Fetching data from an API.<button onclick="fetchData()">Fetch Data</button> <p id="data"></p><script> function fetchData() { fetch('https://jsonplaceholder.typicode.com/posts/1') .then(response => response.json()) .then(data => { document.getElementById('data').innerHTML = data.title; }); } </script>

6. Web Workers API

Purpose: The Web Workers API allows you to run scripts in background threads. This is useful for performing CPU-intensive tasks without blocking the user interface.

Key Methods:

new Worker('worker.js'): Creates a new web worker.

postMessage(data): Sends data to the worker.

onmessage: Event handler for receiving messages from the worker.

Example: Simple Web Worker.<script> if (window.Worker) { var myWorker = new Worker('worker.js'); myWorker.postMessage('Hello, worker!'); myWorker.onmessage = function(e) { document.getElementById('output').innerHTML = e.data; }; } </script> <p id="output"></p>

worker.js:onmessage = function(e) { postMessage('Worker says: ' + e.data); };

7. WebSocket API

Purpose: The WebSocket API allows for interactive communication sessions between the user’s browser and a server. This is useful for real-time applications like chat applications, live updates, etc.

Key Methods:

new WebSocket(url): Opens a WebSocket connection.

send(data): Sends data through the WebSocket connection.

onmessage: Event handler for receiving messages.

Example: Connecting to a WebSocket.<script> var socket = new WebSocket('wss://example.com/socket'); socket.onopen = function() { socket.send('Hello Server!'); }; socket.onmessage = function(event) { console.log('Message from server: ', event.data); }; </script>

8. Notifications API

Purpose: The Notifications API allows web applications to send notifications to the user, even when the web page is not in focus.

Key Methods:

Notification.requestPermission(): Requests permission from the user to send notifications.

new Notification(title, options): Creates and shows a notification.

Example: Sending a notification.<button onclick="sendNotification()">Notify Me</button><script> function sendNotification() { if (Notification.permission === 'granted') { new Notification('Hello! This is a notification.'); } else if (Notification.permission !== 'denied') { Notification.requestPermission().then(permission => { if (permission === 'granted') { new Notification('Hello! This is a notification.'); } }); } } </script>

HTML APIs allow you to build rich, interactive web applications by providing access to browser features and capabilities. These APIs are widely supported across modern browsers, making them a vital part of contemporary web development.

Read More…

[modernwebstudios]

Web Development and Design Foundations with HTML5

In the digital age, web development and design are essential skills for creating engaging, functional, and aesthetically pleasing websites. At the heart of this process is HTML5, the latest version of the Hypertext Markup Language. HTML5 serves as the foundation for building web pages, offering new elements, attributes, and behaviors that allow for more dynamic and interactive web content.

Understanding HTML5

HTML5 is the fifth iteration of HTML, introduced to enhance the capabilities of web development and design. It is designed to be both backward-compatible and forward-looking, ensuring that it works with older browsers while also providing new functionalities for modern web applications. The primary goal of HTML5 is to improve the web's ability to handle multimedia, graphics, and interactive content without relying on external plugins.

Key Features of HTML5

One of the most significant enhancements in HTML5 is the introduction of semantic elements. These elements, such as header, footer, article, and section, provide meaning to the structure of a web page, enhancing accessibility and improving code readability. This not only benefits developers but also aids search engines in understanding the content of a web page better.

HTML5 includes native support for audio and video through the audio and video elements, which eliminates the need for external plugins like Flash. This makes it easier to embed and control multimedia content directly within the HTML code, improving the user experience and enhancing web page performance.

Another critical feature of HTML5 is the canvas element, which allows for drawing graphics on the fly using JavaScript. This capability, along with Scalable Vector Graphics (SVG), enables the creation of complex visual content and interactive graphics. These tools are essential for modern web applications that require dynamic and responsive visual elements.

HTML5 also offers new input types and attributes for forms, such as date, email, range, and number. These enhancements improve user experience by providing better validation and more interactive form elements. Additionally, the new elements reduce the need for JavaScript to validate user input, streamlining the development process.

Local storage options like localStorage and sessionStorage are introduced in HTML5, allowing web applications to store data on the client side. This feature enhances performance by reducing the need for server requests, enabling faster access to stored data and improving the overall user experience.

Building Blocks of HTML5

To create a web page with HTML5, understanding its basic building blocks is essential. Every HTML5 document begins with the DOCTYPE declaration, followed by the html, head, and body tags. The html element is the root of the document, the head element contains meta-information, and the body element includes the content of the web page.

Text elements in HTML5 include headings, paragraphs, lists, and emphasis elements, which structure the text content of a web page. Headings range from h1 to h6, providing different levels of importance, while paragraphs group related sentences together. Lists, both ordered and unordered, organize items, and emphasis elements like em and strong highlight important text.

Links and images are integral parts of web development. The anchor element creates hyperlinks, allowing users to navigate between different web pages, while the image element embeds images into the web page. Both elements support various attributes to enhance functionality and improve user interaction.

HTML5 allows for the creation of tables to display tabular data. Tables consist of rows and columns, with the table, tr, th, and td elements defining the structure. Tables are useful for presenting data in an organized manner, making it easier for users to understand and interpret the information.

Designing with HTML5 and CSS3

While HTML5 provides the structure, CSS3 (Cascading Style Sheets) is used to style and layout web pages. CSS3 introduces new features like rounded corners, gradients, shadows, and animations, which enhance the visual appeal of web pages. CSS3 rules consist of selectors and declarations. Selectors target HTML elements, and declarations specify the style properties and values.

Responsive design is enabled through media queries, which apply different styles based on the device's screen size. This ensures that web pages look good on all devices, from desktops to smartphones. Flexbox and Grid are CSS3 layout modules that provide powerful tools for creating complex, responsive layouts, allowing developers to align, distribute, and size elements efficiently.

Best Practices for Web Development with HTML5

Using semantic HTML improves code readability and accessibility. Elements like nav, article, and aside provide context and meaning to the content, making it easier for search engines and assistive technologies to understand the structure of a web page. Ensuring your web pages are accessible to all users, including those with disabilities, is crucial. Use attributes like aria-label and role to provide additional information to assistive technologies.

Performance optimization is essential for a good user experience. Optimize your web pages by minimizing file sizes, using efficient coding practices, and leveraging browser caching. Testing your web pages across different browsers and devices ensures consistent behavior and appearance, addressing cross-browser compatibility issues.

Writing clean, well-documented code that is easy to maintain and update is a best practice in web development. Use external stylesheets and scripts to keep your HTML files concise, improving code organization and maintainability.

Conclusion

HTML5 forms the backbone of modern web development, providing the structure and functionality needed to create dynamic and interactive web pages. Coupled with CSS3 for styling and responsive design, HTML5 allows developers to build websites that are both visually appealing and highly functional. By understanding the foundations of HTML5 and adhering to best practices, you can create robust and accessible web applications that meet the demands of today's digital landscape. Whether you're a beginner or an experienced developer, mastering HTML5 is a crucial step in your web development journey.

[saifosys]

Javascript Web Storage and APIs with syntax and examples

Javascript Web Storage and APIs with syntax and examples Web Storage: - Web Storage allows web applications to store data locally within the user's browser. - Web Storage provides two mechanisms for storing data: localStorage and sessionStorage. - Data stored in localStorage persists even after the browser is closed, while data stored in sessionStorage is deleted when the browser is…

[subhambiswas287]

Mastering Web Success: Solutions to Top User Pain Points by a Website Development Company in Kolkata

In the field of website development, addressing user pain points is crucial for ensuring a positive experience. Based on extensive research, here are some key pain points and solutions:

Small Text and Tiny Click Targets: Small-sized text and tiny interactive elements can lead to poor readability and frustrating user interactions. To improve, ensure a minimum body text size of 16px and optimize touch targets for mobile use, with a recommended size of 9×9 mm or 48x48 px​.

Unexpected Content Shifts and Data Loss: Dynamic content loading can cause unexpected layout shifts, disrupting user experience. To mitigate this, specify dimensions for images and avoid dynamic content insertion. Additionally, prevent data loss in web forms by using localStorage and sessionStorage for data preservation​.

Navigation and Sign-Up Walls: Poor navigation can confuse users, and compulsory sign-ups can block user exploration. A clear and consistent navigation structure alongside a flexible approach to sign-ups, like offering a free trial, enhances user experience​.

Autoplay Videos and Slow Loading: Autoplay videos with sound can be intrusive. Mute these by default. Slow loading times can be addressed by optimizing image sizes, minimizing HTTP requests, and using Content Delivery Networks.

HTML vs. CMS and Website Updates: When deciding between HTML and a CMS like WordPress for website building, consider your technical expertise and the need for updates. WordPress offers a user-friendly platform and is often preferred for its ease of content management and wide range of design templates​.

SEO Considerations: Search Engine Optimization (SEO) is crucial for website visibility. Focus on creating quality content, optimizing page speed, and ensuring your website is mobile-friendly. Remember to label icons clearly and ensure that your design is responsive across different devices​​.

For businesses based in Kolkata looking for specialized help in these areas, a website development company in Kolkata can provide tailored solutions. They can address these common pain points effectively, leveraging local insights and expertise to enhance the overall user experience and performance of your website.

[hindintech]

You can learn JavaScript easily, Here's all you need to get started:

1.Variables

• var

• let

• const

2.Data Types

• number

• string

• boolean

• nUll

• undefined

• symbol

3.Declaring variables

• var

• let

• const

4.Expressions

Primary expressions

• this

• Literals

• []

• {}

• function

• class

• function*

• async function

• async function*

• /ab+c/i

• 'string'

• ()

Left-hand-side expressions

• Property accessors

• ?.

• new

• new .target

• import.meta

• super

• import()

5.operators

• Arithmetic Operators: +, -, *, /, %

• Comparison Operators: ==, ===，!=,!==, <, >, <=, >=

• Logical Operators: &&, ||, !

6.Control Structures

• if

• else if

• else

• switch

• case

• default

7.Iterations/Loop

• do…..while

• for

• for...in

• for...of

• for await...of

• while

8.Functions

• Arrow Functions

• Default parameters

• Rest parameters

• arguments

• Method definitions

• getter

• setter

9.Objects and Arrays

• Object Literal: { key: value }

• Array Literal: [element1, element2, ...]

• Object Methods and Properties

• Array Methods: push(), pop(), shift(), unshift(), splice(), slice(), forEach(), map(), filter()

10.Classes and Prototypes

• Class Declaration

• Constructor Functions

• Prototypal Inheritance

• extends keyword

• super keyword

• Private class features

• Public class fields

• static

• Static initialization blocks

11.Error Handling

• try,

• catch,

• finally (exception handling)

12.Closures

• Lexical Scope

• Function Scope

• Closure Use Cases

13.Asynchronous JavaScript

• Callback Functions

• Promises

• async/await Syntax

• Fetch API

• XMLHttpRequest

14.Modules

• import and export Statements (ES6 Modules)

• CommonJS Modules (require, module.exports)

15.Event Handling

• Event Listeners

• Event Obiect

• Bubbling and Capturing

16.DOM Manipulation

• Selecting DOM Elements

• Modifying Element Properties

• Creating and Appending Elements

17.Regular Expressions

• Pattern Matching

• RegExp Methods: test(), exec(), match(), replace()

18.Browser APIs

• localStorage and sessionStorage

• navigator Obiect

• Geolocation API

• Canvas API

19.Web APIs

• setTimeout(), setlnterval()

• XMLHttpRequest

• Fetch API

• WebSockets

20. Functional Programming

• Higher-Order Functions

• map(), reduce(), filter()

• Pure Functions and Immutability

21.Promises and Asynchronous Patterns

• Promise Chaining

• Error Handling with Promises

• Async/Await

22.ES6+ Features

• Template Literals

• Destructuring Assignment

• Rest and Spread Operators

• Arrow Functions

• Classes and Inheritance

• Default Parameters

• let, const Block Scoping

23.Browser Object Model (BOM)

• window Object

• history Object

• location Obiect

• navigator Object

24.Node.js Specific Concepts

• require()

• Node.js Modules (module.exports)

• File System Module (fs)

• pm (Node Package Manager)

25.Testing Frameworks

• Jasmine

• Mocha

• Jest

[techfygeeks]

Explain HTML5 Web storage

In the ever-evolving landscape of web development, HTML5 introduced a game-changing feature known as web storage. This feature allows web developers to store data on the client-side, offering a more efficient and flexible alternative to traditional cookies. In this blog, we'll explore HTML5 web storage, its two key components (localStorage and sessionStorage), and how it empowers developers to enhance the user experience.

HTML5 Web Storage: An Overview

HTML5 web storage provides a mechanism for web applications to store data locally in a user's browser. Unlike cookies, which have limited storage capacity and are sent with every HTTP request, web storage offers a more robust solution. It allows developers to store data directly in the user's browser, reducing the amount of data sent to the server and improving overall performance.

LocalStorage vs. SessionStorage

HTML5 web storage consists of two main components: localStorage and sessionStorage. Let's delve into the differences between these two storage options:

LocalStorage:

Persistence: Data stored in localStorage remains available even after the user closes the browser or navigates away from the website. It persists across browser sessions and is not tied to a specific tab or window.

Capacity: Typically, localStorage offers a larger storage capacity compared to sessionStorage, which can vary from 5-10 MB depending on the browser.

Use Cases: localStorage is well-suited for storing long-term data such as user preferences, cached data, or application settings that need to be retained between sessions.

SessionStorage:

Session-Based: Data stored in sessionStorage is only available for the duration of the page session. When the user closes the tab or window, the data is cleared.

Isolation: Each tab or window has its own isolated sessionStorage, ensuring that data stored in one tab is not accessible by another. This can be advantageous for implementing security or isolation between browser tabs.

Use Cases: sessionStorage is useful for temporary data storage, such as maintaining form data across multiple pages during a single session or managing data that should not persist beyond the current browsing session.

Benefits of HTML5 Web Storage:

Improved Performance: By storing data locally, web storage reduces the need to transmit data to the server with each request, resulting in faster page load times and a more responsive user experience.

Increased Storage Capacity: HTML5 web storage offers more storage space compared to traditional cookies, enabling developers to store larger datasets.

Simplified Data Management: Web storage simplifies data management on the client-side, making it easier to work with user preferences, settings, and cached data.

Enhanced Security: Data stored in web storage is not sent to the server, reducing the risk of exposing sensitive information to potential threats.

No Expiry: Unlike cookies, data in web storage does not have an expiration date, ensuring that stored information remains accessible until explicitly removed by the application or the user.

Best Practices and Considerations:

Be mindful of the data you store in web storage, as it is accessible to JavaScript on the client-side.

Implement data validation and security measures to prevent data corruption or unauthorized access.

Regularly clean up and remove outdated or unnecessary data to avoid storage clutter.

Conclusion

HTML5 web storage has opened up exciting possibilities for web developers, transforming the way data is managed and enhancing user experiences. This client-side data storage solution, with its localStorage and sessionStorage components, provides a more efficient and scalable alternative to traditional cookies.

To harness the full potential of HTML5 web storage and integrate it effectively into your web development projects, consider enrolling in an online web development course. These courses offer structured learning experiences, hands-on practice, and expert guidance in utilizing web storage and other cutting-edge technologies. By embarking on an web development course, you not only gain proficiency in web storage but also acquire a broader skill set to create responsive and user-friendly web applications. Embrace this opportunity to stay at the forefront of web development through an online web development course, and elevate your capabilities in this ever-evolving field.

[angulardevelopment]

How to Store temporary Form Data in an Angular and SessionStorage ☞ https://morioh.com/p/6c30d73e43c8

#morioh #sessionstorage #angular

[anya-dev]

Hi! I have a... finding??? Whenever I play the game on mobile, this message always pops up: SecurityError: Failed to read the 'sessionStorage' property from 'Window': Access is denied for this document. Error: Failed to read the 'sessionStorage' property from 'Window': Access is denied for this document. The game is still playable, but you're unable to save throughout the game. Not sure if it's something on my end, but just thought I'd let you know. 🤠

Hmmmmm thank you so much for sending my way! This seems to be...new? Since I tested on mobile originally. But I’ll look into it - thank you!!