Angular

AngularJS is a fully featured client-side JavaScript MVC framework. It gives an AngularJS developer everything needed to create a powerful dynamic web application. Sites like Google, Virgin America, and HBO’s mobile site are powered by AngularJS.

Originally, this front-end JavaScript framework was developed by Google, but now it is an open source framework with great support from Google’s community.

ANGULAR HIGHLIGHTS:

  • Two-way data binding
  • Modular development
  • Dependency injection
  • Templating
  • Unit testing ready
  • Deep-link routing
  • MVC pattern support

 

Angular

Angular versions comparison

Angular was first released by Google in 2010. It utilized TypeScript, JavaScript and traditional HTML with two-way data binding for a dynamic front-end development. AngularJS 1 offered no mobile support. Its purpose was building simple apps and providing easy maintenance.

In 2016, Angular 2 was released. It came out with an entirely different architecture and eightfold speed increase for rendering and updating pages. Angular 2 highlights include improved performance, powerful templating, simple APIs and easy debugging.

With the release of Angular 4, its apps became faster and more compact. Now you can reduce the size of the code by almost 60 percent. See a detailed Angular versions comparison in the table below.

You might be interested in HTML5 development services.

ANGULARJS ANGULAR 2
Language Choices
ES5, ES6/ES2015 ES5, ES6/ES2015, TypeScript, Dart
Angular Modules
To define module, you need use .module function

 

(function () {
  angular
   .module(‘app’, [Dependencies]);
})();

Root module:

<html ng-app=”app”>
@NgModule decorator on a class

 

import { NgModule } from ‘@angular/core’
import { BrowserModule } from ‘@angular/platform-browser’;

@NgModule({
  imports: [BrowserModule, …,Dependencies],
  declararions: [ … ],
  bootstrap: [ ... ]
})

Root module:

export class AppModule {}
Controllers to Components
Controllers

 

(function () {
  angular
    .module(‘app’)
    .controller(‘SomeController’, SomeController);

  function SomeController() {
    var vm = this;
    vm.title = “Some Title”
  }

Template:

<body ng-controller=”SomeController as vm”>
  <h2>{{vm.title}}</h2>
  <h2 ng-bind=”vm.title”></h2>
  </body>
Components

 

import { Component } from ‘@angular/core’;

@Component({
  selector: ‘my-component’,
  template: <h2>{{title}}</h2>
}) 

export class SomeComponent { 
  Title = ‘Some title’ 
}

Template:

<my-component></my-component>
Structural Built-In Directives
Ng-repeat, ng-if, …

 

<ul>
  <li ng-repeat=”post in vm.posts”>
    {{post.title}}
  </li>
</ul>
Indicated by the * prefix
Changes the structure
*ngFor, *ngIf, …

 

<ul>
  <li *ngFor=”let post of posts”>
    {{post.title}}
  </li>
</ul>
Data binding
  • Interpolation (<h1>{{title}}</h1>)
  • 1 Way Binding (<h1 ng-bind=”title”></h1>)
  • Event binding: ng-click=””, ng-blur=””, …
  • 2 Way Binding <input ng-model=”vm.name”>
  • Interpolation (<h1>{{title}}</h1>)
  • 1 Way Binding, any HTML Element property (<h1 [innerText]=”title”></h1>)
  • Event binding: (click)=””, (blur)=””, …
  • 2 Way Binding <input [(ngModel)]=”name”
Less Built-in Directives
Many directives: Ng-style, ng-src=”{{path}}”, ng-href=”{{link}}” Removes the need for many directives: [style.color]=””, [src]=”path”, [href]=”link”. Angular 2 template concepts remove 40+ Angular 1 built-in Directives
Services
Five types of services:

 

  • Factories
  • Services
  • Providers
  • Constants
  • Values
(function () {
  angular
    .module(‘app’)
    .service(‘PostsService’, PostsService);

  function PostsServices() {
    this.getPosts = function () {
      return [
        { id: 1, title: ‘Title1’ },
        { id: 2, title: ‘Title2’ }
      ]
    }
  }
})();
  • Class
import { Injectable } from ‘@angular/core’;

@Injectable()
export class PostsService {
  getPosts = () => [
    { id: 1, title: ‘Title1’ },
    { id: 2, title: ‘Title2’ }
  ];
}
Registering Services with the Injector
(function () {
  angular
    .module(‘app’)
    .service(‘PostsService’, PostsService);

  function PostsServices() {
    this.getPosts = function () {
      return [
        { id: 1, title: ‘Title1’ },
        { id: 2, title: ‘Title2’ }
      ]
    }
  }
})();
Registering provider in @NgModule decorator:

 

@NgModule({
   imports: [BrowserModule],
   Declarations: [PostsComponent],
   providers: [PostsService],
   bootstrap: [PostsComponent]
})

export class AppModule { }
Dependency Injection
Angular 1 has one global injector:

 

SomeController.$inject = [‘SomeService’]
Function SomeController(SomeService) {}
Angular 2 has hierarchical injectors and an injector at the app root

 

export class SomeComponent {
    constructor(private someService: SomeService){}
}
Angular Formatters
Filters Pipes – allow us to transform data for display in a Template
Examples:

 

<p>{{post.title | uppercase}}</p>
<p>{{post.date | date:’yMMMd’}}</p>
<p>{{price | currency}}</p>
HTTP
Promises

 

this.getPosts = function() {
  return $http.get(‘api/posts’)
    .then(function(response) {
      return response.data.data;
    })
    .catch(handlerError)
}
Promises:

 

 
getPosts() {
    return this.http.get(‘api/posts’)
      .map((response: Response) => 
        <Post[]>response.json().data)
      .toPromise()
      .catch(this.handleError)
}

Observables:

getPosts() {
    return this.http.get(‘api/posts’)
      .map((response: Response) => 
        <Post[]>response.json().data)
      .catch(this.handleError)
}

Async Pipe – subscribes to a Promise or an Observable, returning the latest value emitted

RxJs (Reactive JS)
Not used Widely used
Routing
$routeProvider.when(...)
<ng-view>

element where we would place destination of the route

Defines href attribute

ng-href=””

$routeParams – accessing routing parameters

Routes – object for configuration

 

<router-outlet>

– destination of the route

[routerLink]=”linkParameters”

ActivatedRoute – accessing routing parameters Route Guards

Built-in Lazy Loading

Differences between Angular 2 and Angular 4

Google adapted the SEMVER (Semantic versioning) approach for its Angular framework. This means Angular 4 is an improved version of Angular 2, rather than an entire rewrite.

Why is there no Angular 3? Due to the misalignment of the router package version – @angular/router was using v3.3 already – Angular developers had to choose Angular 4 for the new version release.

The Angular team had a goal to make Angular apps faster and more compact, and this is how they achieved it.

Under-the-Hood Changes:

  • New changes reduce the size of the generated code for your components by around 60 percent in most cases
  • Faster Compilation
  • Better Bug fixes Alert

Changes in Imports and Syntax:

  • Animations are pulled out of @angular/core so as to remove the extra code being imported into our production bundle, though you can easily add animation by importing {BrowserAnimationsModule} from @angular/platform-browser/animations into NgModule
  • Renderer 2 in place of Renderer from same ‘@angular/core’
  • *ngIf/else: Now you can use else clause as well

For email validation in Angular forms:

  • Earlier Angular 2 : pattern = “[a-z0-9!#$%&’*+\/=?^_`{|}~.-]+@[a-z0-9]([a-z0-9-]*[a-z0-9])?(\.[a-z0-9]([a-z0-9-]*[a-z0-9])?”
  • Now Angular 4: Now just put email as an attribute to input field where you want to have email ID. Here email is an Angular directive not to be confused with the type=”email” which is just an HTML DOM type property.
  • TypeScript 2.1 and 2.2 compatibility

Our AngularJS Projects

Considering all these amazing features, AngularJS web development and mobile development is the right choice for creating next generation apps. Below you will find the top 4 websites and apps built by our AngularJS development company.

Web application development with AngularJS
Our AngularJS development company created a fully functioning online chat, where users can easily find partners and friends, chat with each other, and exchange files. AngularJS is a perfect solution for creating social networks and online chat rooms.

Robust Angular’s UI development
AngularJS framework enabled us to create a beautiful web application for a remodeling portal. It was not only beautiful but also functional. Users could select a room and decorate it with items they desired. In the end, they could see how their room would look in real life.

Angular + D3 library development
Combining AngularJS and D3.js library, our AngularJS team built out-of-the-box charts and graphs for different analytics data collected from Twitter, Linkedin, and Instagram as well as more than 60,000 global news outlets in 250+ languages and 191 countries. Using these modern technologies, we achieved powerful visualization and interaction features with the data-driven approach.

Angularjs mobile app development
Using AngularJS and Ionic framework, our AngularJS developers created a beautiful easy-to-use interface for the mobile application that connects users to the internal project management and time reporting system. Now users can quickly check tasks and write reports using their smartphones.