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Tuesday, 18 October 2016

Angular 2.0 Architecture

Angular is a framework for building client applications in HTML and either JavaScript or a language like TypeScript that compiles to JavaScript.

There are four main key players in Angular 2.0
  • Components
  • Directives
  • Routers
  • Services

In Angular 1.0, we used controllers, directives and scope to build a logic , but in Angular 2.0, all these are combined and introduced components.
It encapsulates the data, template and behaviour of a view. It exposes the public api to the other components.
component controls a patch of screen called a view.
For example, the following views are controlled by components:

  • The app root with the navigation links.
  • The list of heroes.
  • The hero editor.
You define a component's application logic—what it does to support the view—inside a class. The class interacts with the view through an API of properties and methods.

Sample to create component:

selector: "my-web"
templateUrl: "my-web.html"
class myWeb(){

in html template :


Angular 2.0 tutorials

I will explain you
with another simple example.

import { Component } from '@angular/core';

@Component({ selector:'my-web',

template:'<div> <h1> Username is {{username}}<input class='button' (click)="getUsername()"></input></div>
export class MyCustomComponent {
 this.username = "Srinivas Nidadavolu"


In html, use the component


we can create widgets using components. 

  • Directives are used to add some behaviour to existing dom elements. It does not have view. These are used to design reusable components.
import { Directive } from 'angular2/angular2';

    selector: "[userDirective]",
hostListeners: {
        'click': 'showMyDetails()'



class Message {
constructor() {}

showMyDetails  () { alert('Name is Alex'); }


<a  userDirective>click on me</a>
Routers  :
  • In Angular 2, Routers manages state transitions.
  • We use url to navigate to different pages.
  • In General, we use url /login to route to login page
  • /home to route to home page ... etc
In Angular 2.0, we use 3 main components to configure routing.
Routes : It describes our application routes.
RouterOutlet : It is a placeholer component.
RouterLink : It is used to link routes.
import {Login} from './Login';
@RouteConfig([ { path: '/login', component: Login, name: 'Login' },
  { path: '/**', redirectTo: ['Login'] }
  • Services are reusable components.It can be shared by multiple components in the application

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