#angular13

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Dependency Injection in Angular with example

Angular is incredibly effective because it takes use of the Dependency Injection design pattern. Classes, components, and modules can interact while yet remaining consistent under this programming paradigm. As a result, the class changes less frequently. What is Dependency Injection? Dependency injection, a well-known programming concept, is what separates a class from its dependencies. Through the use of dependency injection, dependent objects can be created independently of classes and provided to classes in a variety of other ways. Think about the classes A and B. Assume class A makes use of class B's objects. A class B instance is typically generated in OOPS so that class A can access the objects. We use DI to remove the dependent objects' construction and binding from the class that depends on them. There are often three different categories of courses, namely: - Client Class - The dependent class on the service class is this one. - Service Class - Class that offers the client class the service. - Injector Class - Injects the object from the service class into the client class. Types of Dependency Injection in Angular In Angular, dependency injections come in three different types, and they are as follows: - Constructor injection: Through a class constructor, it gives the dependencies in this case. - Setter injection: The injector injects the dependence into a setter method that is used by the client. - Interface injection: Any client that is provided to the injector method by the dependence will receive the injection of the dependency. A setter method that accepts the dependence must be exposed through an interface that the clients must implement. Benefits of Dependency Injection - loosely coupled - Our Component is currently just loosely connected to the ProductService. The ProductService cannot be created by AppComponent. In reality, it has no knowledge of the ProductService. It only functions with the ProductService that was provided to it. ProductService, BetterProductService, or MockProductService are all acceptable options. The AppComponent is apathetic. - Easily Testable Testing AppComponent is now simpler. Our AppComponent is no longer reliant on a specific ProductService implementation. Any ProductService implementation that is provided to it will function. To pass during testing, simply create a mockProductService Class. - Reusing the Component: It gets simpler to reuse the component. With every ProductService moving forward, our Component will function as long as the interface is respected. Our AppComponent is now tested, maintainable, etc. thanks to the dependency injection technique. But does it fully resolve all of our issues? No, we simply transferred the Problem from the Component to the Component Creator. How can we make a ProductService object and send it to the AppComponent? Angular Dependency Injection accomplishes that. How DI (Dependency Injection) works Take into account the following service, which is produced by: ng g service test import { Injectable } from '@angular/core'; @Injectable({ providedIn: 'root' }) export class TestService { importantValue: number = 42; constructor() { } returnImportantValue() { return this.importantValue; } } As one can see, by including the @Injectable decorator in a class, we may construct injectable dependencies. We include the aforementioned dependent in the component shown below: import { TestService } from './../test.service'; import { Component, OnInit } from '@angular/core'; @Component({ selector: 'app-test', templateUrl: './test.component.html', styleUrls: }) export class TestComponent implements OnInit { value: number; constructor(private testService: TestService) { } ngOnInit() { this.value = this.testService.returnImportantValue(); } } At the top of the page, one can see that we have imported our TestService. The returnImportantValue function of the service was then implemented when we generated an instance inside the function Object() { } of the component. We can see from the aforementioned example how angular offers a fluid approach to inject dependencies in any component.

Conclusion

An excellent, multipurpose framework that accelerates development is Angular. It provides deep linking and dependency injection and is a reliable platform for software development. Read the full article

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Angular is called the "Superheroic JavaScript MVW Framework" and it is used to create mind-blowing web and application solutions. To ensure AngularJS Development Services benefits are sustained early, Google consistently releases new forms of AngularJS.

The last three versions that Angular released are Angular 11, 12 & 13. Therefore we have done a thorough analysis of 11, 12 & 13 and compared them. This article will provide you with all the information about their features and significant differences between the three forms of AngularJS development according to the perspective of an AngularJS development company. Therefore just click on the link and read the blog.

  Comparison Between Angular 11 vs 12 vs 13

#Angular #AngularJS #angulardeveloper #AngularJSDevelopment #Angular13 #angularversioncomparison

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Rutas hijas, párametros y QueryParams en Angular - 28 Días aprendiendo A...

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Angular 13: Noteworthy Add-ons, Enhancements, and Modifications!

The dynamic team of the popular typescript-based web framework, Angular, has been known for its periodic updates to keep up with changing times and emerging technologies. And, here’s another update that has created a buzz in the technical world. Their latest update, Angular 13, rolled out on 3rd November 2021; is one of their most organized, pre-planned, and game-changing updates so far.

So, what's new in angular13? Well, this post discusses all the noteworthy add-ons, embellishments, improvements, deletions as well as modifications. Let’s peek through the novel offerings of Angular 13!

Angular 13: Major Add-ons, Enhancements, and Modifications

Ivy View Engine replaces the Legacy View engine

After the Angular team had rolled out multiple updated versions that marked a transitioning phase to the Ivy View Engine, Angular 13 is now 100% Ivy. Angular has completely removed support for the legacy view engine and supports only Ivy. The existing libraries will get migrated to the “partial” compilation mode automatically and the metadata that was earlier needed for the legacy View Engine will be removed. Angular developers should switch from “enableIvy:false” to “compilationMode:partial” to keep up with the update.

This update brings about speedier compilation as well as enhanced productivity to Angular app development. Moreover, the Ivy approach enables developers to write codes dynamically unlike the previous versions, wherein the developers needed a boilerplate for code creation. Using the previous versions, developers are required to inject ComponentFactoryResolver into the constructor for creating components. But, with V13, components can be created without having to create an associated factory using ViewContainerRef.createComponent.

Modifications in the APF (Angular Package Format)

The APF (Angular Package Format) defines the format and the structure of the packages contained within the Angular framework. This approach greatly helps in packaging third-party libraries in the web development environment. Angular 13 comes with a new version of the APF, a modernized and streamlined APF.

Modifications and add-ons

· Older output formats including View Engine-specific metadata, have been eliminated which will minimize the maintenance expenses as well as the complexity of the codebase.

· Libraries created using the updated APF will not need to use ngcc any longer; resulting in a leaner package as well as quicker execution.

· The production of UMD bundles have been removed

· The new APF supports Node package Exports and as such, Angular developers will no longer unknowingly rely on internal APIs that are subject to change.

· It generates ES2020 output and Ivy partial compilation output

· The new APF makes use of the package exports using the sub-path pattern feature from Node.js for displaying multiple available outputs at each entry point.

Form and Router Enhancements

V13 comes with FormControlStatus, a new type for forms which is a union type of all status strings possible concerning form controls. This add-on brings about two more modifications – the type of AbstractControlStatus changes to FormControlStatus and StatusChanges now has Observable<FormControlStatus> instead of Observable<any>.

V13 introduces a host of new functions that manage form validation like addValidators, setValidators, hasValidators, removeValidators, alongside their equivalent async versions – addAsyncValidators, setAsyncValidators, hasAsyncValidators, and removeAsyncValidators.

Now let’s take a look at the router modifications. The earlier Angular versions had an empty string to set the routerLink directive value to zero and undefined; without any means for disabling the link’s navigation. However, with Angular 13, you can entirely disable the navigation, if you set the same values to routerLink directive. Another add-on is Active Change, a new output for the RouterLink directive; which is produced every time when a related link becomes either active or inactive. Developers using V13 can use dynamic ESM import statements as in this updated version; the load property that is a part of the route definition is unable to accept string values.

Enhancements to Angular Material Components

The enhancements made to Angular Material Components include:

· The addition of a default role to the “table” and stepper updations

· Improved ARIA descriptions and Datepicker

· Better accessibility of matChipRemove and a sturdy focus option for the slider

· The touch sizes of the radio buttons and checkboxes are now bigger resulting in a smoother UX with higher contrast modes.

· The feature of accurately detecting fake mouse down events from the screen readers employing FocusMonitor such that Angular applications are able to correctly interpret the occurrence of focus or click events on the screen.

Performance Improvements in Angular 13

· The usage of ergonomic code-splitting APIs and the practice of breaking down the granular code at a component level has reduced the load times considerably.

· ESBuild, a superfast JavaScript bundler, has helped in enhancing the performance as well. It works with Terser for optimizing global scripts, supports CSS source maps that allow optimized global CSS, and also supports languages such as Vue, Svelte, and Elm that are used in other frameworks.

· Owing to the new enhanced Angular CLI, the framework currently supports persistent build-cache by default – build outcomes are cached on the disk. Consequently, the speed of Angular app development accelerates by 68% as compared to the existing speed.

· In V13, the opt-in feature is enabled by default

· There are no Angular traits such as Directive, Component, Pipe, NgModule decorators, Injectable, etc. in the incremental builds performance.

Support for IE11 removed

The Angular team has removed support for IE11 (Internet Explorer11) in the latest version Angular13, based on customer feedback, to make it future-ready. As a result, the entire infrastructure concerning IE11 – build passes, CSS code paths, polyfills, special JS, etc. – will be eliminated.

Advantages

· Angular can now enjoy the benefits of native web APIs and also leverage the features of new-age browsers – web animations and CSS variables.

· Angular applications built in Angular 13 will have smaller-sized bundles and load faster as code paths and IE-specific polyfills can be removed.

· It eliminated the requirement for differential loading.

The build infrastructure and enhanced APIs will prove beneficial to Angular app developers, whereas the end-users will enjoy speedier load times as well as an improved UX.

However, this update will affect organizations that still use Internet Explorer 11 and have not yet migrated to modern browsers like Microsoft Edge. For migrating your project to Angular 13, you have to run the ng update – this will automatically drop the IE-specific polyfills and minimize the bundle size during migration. The existing Angular development projects that still need the support for IE11, can continue using Angular 12, which will be supported till November 2022.

Other Noteworthy Add-ons and Enhancements in Angular 13

· The introduction of TypeScript 4.4 allows users to access the multiple languages functionality while working on it. This feature was absent in the previous Typescript versions.

· Now in-built validators like max,min, and minLength can be dynamically enabled or disabled.

· The support for inlining Adobe Fonts has been added in Angular 13, just as inlining Google font support was added during the Angular11 update. Inlining fonts are responsible for speeding up the FCP (First Conceptual Performance) and this improves the web performance substantially.

· Angular Developers can leverage the benefits of the updated RxJS7.4 for developing new projects employing the new ‘ng’ command. The Angular projects that are in RxJS V6.x, are to be manually updated with the help of the command npm install rjs@7.4.

· The TestBed segment is now an improved one that functions impeccably to tear down test modules and environments after every test. The DOM gets cleaned by default after each test. So, developers can expect tests that are lesser memory-intensive, have a lower amount of interdependency, are more optimized, and get executed much faster.

Bottomline:

I hope my post has provided you with comprehensive insights on the most significant updates that influence Angular app development.

Looking for further clarification on Angular 13 updates or would like to hire technical assistance for leveraging these amazing features to build futuristic apps/software solutions?

Contact Biz4Solutions, a highly experienced and distinguished Angular app development company that excel in providing high-end services to clients across the globe.

To know more about our other core technologies, refer to links below:

React App Development

Ionic App Development

Swift App Development

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Angular 12 Vs Angular 13: Features, Updates, and Comparison

Angular 12 Vs Angular 13 | Our personal and professional lives have become more reliant on web and mobile applications. This revolutionary change has led Various development organizations to look for a better choice for building mobile and web apps, and Angular is one of them.

The Angular framework is a javascript structure that is written in typescript. It was developed by Google with the goal of decoupling an application’s logic from DOM control. Because of its remarkable and stunning features are known as the “Superheroic JavaScript MVW Framework.”

The incredible features make it easy for designers to create rich, superior apps without any issue. It is going to stick around for quite some time as it is created by GoogleThe most recent stable version of Angular was released on November 3rd, 2021, while the current version, Angular 12, was released on May 12th, 2021.

In this article, we’ll walk through the differences between Angular 12 Vs Angular 13, angular 13; what’s new for Angular front-end developers, but before diving into it, let’s see the Google Trends popularity of Angular in 2021.

Read More-  Angular 12 Vs Angular 13

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New features - Angular 13!

https://bit.ly/30RCYFc

[katyslemon]

Angular13 NewFeatures Highlights Angular "Performance Improvements" Changes Technologies

Introduction

Considering all the releases taken place in the past, Angular 13 is one of the most organized pre-planned upgrades for the widely adopted typescript-style web framework Angular. By September 24, 2021, the creators of Angular have already designed and released eight different beta versions of Angular 13.

Regarding the latest release of Angular version 13, I will make sure to include everything noteworthy as we did in the previous blogposts of Angular 12, Angular 11, and Angular 10. If you are interested in a bird-eye view of what’s new in Angular 13, then here’s a quick sneak peek at Angular 13 release notes, quick Angular core updates and top new features of Angular 13.

Quick Highlights of Angular 13

Angular 13 is officially released on November 03, 2021.

100% Ivy = Improved localization API to dynamically create components

RxJS- Reactive Extensions for JavaScript programming library is supported >=7.4

IE11 not supported

such as min, max, and minLengt can be enabled dynamically or disabled

Significant improvement in build-cache by 70%

Easier directives disabling

The error message has been improved

Removing View Engine Support

Improved APF – faster execution

Angular TestBed improvement

TypeScript >=4.4.x

Angular 13 Features

Here’s the latest Angular 13 new features that you should to before you upgrade your App to Angular 13. Read more...

[codesolutionstuff]

Learn how to build Firebase Login with Facebook in Angular with Firebase and how to use the Firebase Facebook login authentication module in simple ways.

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What is the difference between constructor and ngOnInit?

The Constructor, a default method of the class, is called when the class is instantiated and makes sure that the fields of the class and its subclasses are properly initialized. Dependency Injector (DI), or Angular, analyses the function constructor  parameters before trying to locate providers that match the types of the function constructor  parameters, resolving them, and passing them to the function constructor when it calls new MyClass() to build a new instance. When Angular is finished building the component, it calls the life cycle hook ngOnInit. Most of the time, we avoid doing anything in the function constructor  by using ngOnInit for all initialization and declaration. The only "work" that the function constructor  should perform is initializing class members. Therefore, you should only use function constructor  to set up Dependency Injection. Better to "start" from ngOnInit(), which is where/when component bindings are determined.

Example

// import OnInit import {Component, OnInit} from '@angular/core'; ... @Component({ ... }) // implementing OnInit export class AppComponent implements OnInit { constructor() { // constructor called first time before the ngOnInit() } ngOnInit() { // called after the constructor and called after the first ngOnChanges() } }

Difference between ngOnInit() and constructor()

- All initialization and declaration operations are performed using function constructor(). - Writing actual work in the function constructor() should be avoided. - The function constructor() should not perform any actual "work," merely initialize class members. - Therefore, to set up Dependency Injection, initialize class fields, etc., we should utilize the function constructor() method. - The "real work code" that must be run as soon as the class is instantiated should be put in ngOnInit(). - similar to loading database data to display to the user in your HTML template view. Such programming should be done in ngOnInit ().

Conclusion

- Initialize class members in the Constructor. - The functionality that has to run right away when the class is created should go in the ngOnInit() function. Read the full article

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For More Details: 📱 Call: +91-9985014433 👉 Chat with us on WhatsApp: https://wa.me//919985024433 👉 Join us on Telegram: https://t.me/sriman_it 👉 Subscribe to Our YouTube Channel: https://bit.ly/3h4Oa5B✍️ Enroll Now: https://bit.ly/3z3QILF

[dominicode]

¿Qué hay de nuevo en Angular v13?

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Learn how to send a verification email to a new user in Angular, as well as how to prohibit users from accessing their accounts until the email has been validated.

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Angular Component Lifecycle Hooks Example

Angular's lifecycle hooks are a unique feature that lets us "hook into" and execute code at a particular component or directive lifecycle event. Angular applications go through a whole range of procedures or have a lifecycle from the moment they are created until they are terminated. When it adds, modifies, or deletes components and directives, Angular maintains them for us. With the help of lifecycle hooks, we may have more control over our application. To achieve this, we add a few certain hook methods to our component or directive that are prefixed with ng. Hooks for components or directives and hooks for child components are the two categories into which these hooks fall. The following will be covered in this article: - The many lifecycle hooks for Angular directives and components - How to run our code by hooking into component lifecycles - What activates lifecycle hooks, and how are they called in sequence? The following, in call sequence, are the hooks for components or directives: - constructor() - OnChanges - OnInit - DoCheck - OnDestroy The hooks for a component's child components are as follows: - AfterContentInit - AfterContentChecked - AfterViewInit - AfterViewChecked The table below provides a summary of the Angular lifecycle hooks: OnChangesThis method is invoked whenever the value of a data-bound property changes.OnInitThis is called each time the directive or component is initialized after Angular has shown the data-bound properties.DoCheckThis is to detect changes that Angular can't or won't notice on its own and to take appropriate action.OnDestroyJust before Angular kills the directive or component, this is the cleanup stage.AfterContentInitAfter Angular projects external material into the component's view, this is invoked in response.AfterContentCheckedAfter Angular has examined the content projected into the component, this is called as a response.AfterViewInitAfter Angular initializes the component's views and child views, this is invoked in response.AfterViewCheckedAfter Angular has checked the component's views and child views, this is invoked in response.Table - Angular Component Lifecycle Hooks OnChanges: Any time a data-bound property of an angular directive changes, this lifecycle hook is called. The Simple Changes object, which contains the current and historical data properties, is returned by this method. Because it continually triggers, make sure to restrict the quantity of processing. @Component({ selector: 'ng-app', template: `...` }) class AppComponent implements OnChanges { ngOnChanges(changes: SimpleChanges) { // code goes here... } } OnInit: During component initialization, this Angular lifecycle hook is immediately called. @Component({ selector: 'ng-app', template: `...` }) class AppComponent implements OnInit { ngOnInit() { // code goes here... } } DoCheck: In cases where Angular is unable to recognize the changes, this lifecycle hook is used in place of ngOnChanges. @Component({ selector: 'ng-app', template: `...` }) class AppComponent implements DoCheck { ngDoCheck() { // code goes here... } } OnDestroy : It is an important lifecycle hook that stops memory leak in Angular. When the component is destroyed, it starts to work. @Component({ selector: 'ng-app', template: `...` }) class AppComponent implements OnDestroy { ngOnDestroy() { // code goes here... } } AfterContentInit : After all of the content in a directive has been initialized by Angular, the callback function is initialized. And only one time, when the directive is called, is it called. @Component({ selector: 'ng-app', template: `...` }) class AppComponent implements AfterContentInit { ngAfterContentInit() { // code goes here... } } AfterContentChecked - Immediately following the directive content check, this lifecycle procedure is invoked. @Component({ selector: 'ng-app', template: `...` }) class AppComponent implements AfterContentChecked { ngAfterContentChecked() { // code goes here... } } AfterViewInit : The moment the component's view is created, this lifecycle method is called. @Component({ selector: 'ng-app', template: `...` }) class AppComponent implements AfterViewInit { ngAfterViewInit() { // code goes here... } } AfterViewChecked : Following the component's content check, this lifecycle function is invoked. @Component({ selector: 'ng-app', template: `...` }) class AppComponent implements AfterViewChecked { ngAfterViewChecked() { // code goes here... } }

Conclusion

Keep in mind that each hook has requirements that must be satisfied. Regardless, they will always carry out their actions one after the other. As a result, hooks are predictable enough to be used even when some of them do not work. Timing the execution of a class is simple with lifecycle hooks. They enable developers to monitor the location of change detection and the appropriate responses for the application. Code that needs load-based dependencies that become available only gradually causes them to stall. Modern front end frameworks are characterized by the component lifecycle. By offering the aforementioned hooks, Angular outlines its lifecycle. Read the full article