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2. Angular 2
i
AbouttheTutorial
Angular 2 is an open source JavaScript framework to build web applications in HTML and
JavaScript, and has been conceived as a mobile first approach.
Audience
This tutorial is designed for software professionals who want to learn the basics of
AngularJS 2 and its programming concepts in simple and easy steps. It describes the
components of AngularJS 2 with suitable examples.
Prerequisites
You should have a basic understanding of JavaScript and any text editor. As we are going
to develop web-based applications using Angular 2, it will helpful if you have an
understanding of other web technologies such as HTML, CSS, AJAX, AngularJS, etc.
Copyright&Disclaimer
Copyright 2016 by Tutorials Point (I) Pvt. Ltd.
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3. Angular 2
ii
TableofContents
About the Tutorial....................................................................................................................................i
Audience..................................................................................................................................................i
Prerequisites............................................................................................................................................i
Copyright & Disclaimer.............................................................................................................................i
Table of Contents....................................................................................................................................ii
ANGULAR 2 — OVERVIEW...................................................................................................1
ANGULAR 2 — ENVIRONMENT............................................................................................3
Creating Configuration Files ....................................................................................................................3
Creating Our First Angular Component ...................................................................................................6
Compile and Run.....................................................................................................................................8
ANGULAR 2 — HELLO WORLD.............................................................................................9
ANGULAR 2 — ARCHITECTURE..........................................................................................13
Module .................................................................................................................................................14
Component ...........................................................................................................................................14
Template...............................................................................................................................................14
Metadata ..............................................................................................................................................14
Data Binding..........................................................................................................................................15
Service ..................................................................................................................................................15
Directive................................................................................................................................................15
Dependency Injection ...........................................................................................................................16
ANGULAR 2 — MODULES..................................................................................................17
ANGULAR 2 — COMPONENTS...........................................................................................21
ANGULAR 2 — TEMPLATES................................................................................................25
4. Angular 2
iii
ANGULAR 2 — METADATA................................................................................................29
ANGULAR 2 — DATA BINDING...........................................................................................35
ANGULAR 2 — DATA DISPLAY............................................................................................39
ANGULAR 2 — USER INPUT...............................................................................................44
Angular 2 - Binding User Input ..............................................................................................................44
Angular 2 - User Input from Event Object..............................................................................................49
Angular 2 - User Input from Local Template Variable ............................................................................52
Angular 2 - Key Event Filtering ..............................................................................................................55
Angular 2 - On Blur Event ......................................................................................................................59
ANGULAR 2 — FORMS.......................................................................................................63
ANGULAR 2 — SERVICES ...................................................................................................70
ANGULAR 2 — DIRECTIVES................................................................................................77
Angular 2 - Components........................................................................................................................77
Angular 2 - Structural Directives............................................................................................................81
Angular 2 - Attribute Directives.............................................................................................................85
ANGULAR 2 — DEPENDENCY INJECTION ...........................................................................92
5. Angular 2
4
Angular 2 is an open source JavaScript framework to build web applications in HTML and
JavaScript, and has been conceived as a mobile first approach. The beta version of Angular 2
was released in March 2014.
Why use Angular 2?
Angular 2 is simpler than Angular 1. The concepts here are easier to understand.
You can update the large data sets with minimal memory overhead.
It will speed up the initial load through server side rendering.
Features of Angular 2
Angular 2 is faster and easier than Angular 1.
It supports the latest version of browsers and also supports old browsers including
IE9+ and Android 4.1+.
It is a cross-platform framework.
Angular 2 is mainly focused on mobile apps.
Code structure is more simplified than the previous version of Angular.
Advantages of Angular 2
If an application is heavy, then Angular 2 keeps it fully UI (User Interface) responsive.
It uses the server side rendering for fast views on mobile.
It works well with ECMAScript and other languages that compile with JavaScript.
It uses dependency injection to maintain applications without writing lengthy codes.
The applications here have a component-based approach.
Disadvantages of Angular 2
Since Angular 2 is a newly introduced framework, there is less online community
support.
It takes time to learn if you are new to Angular 2.
ANGULAR 2 — OVERVIEW
6. Angular 2
5
In this chapter, let us discuss the Angular 2 development environment in detail.
Angular uses TypeScript, which is a primary language for developing Angular
applications.
TypeScript is a super set of JavaScript, which is migrated to TypeScript. Here, the code
written in TypeScript makes it less prone to runtime errors.
To set up the development environment, follow these steps:
Step 1: Create a project folder in your local drive by typing the commands in the command
prompt as given below.
mkdir angular2-demo
cd angular2-demo
CreatingConfigurationFiles
The creation of configuration files follows the step mentioned above.
Step 2: You need to create tsconfig.json which is the TypeScript compiler configuration file.
It guides the compiler to generate JavaScript files.
{
"compilerOptions": {
"target": "es5",
"module": "system",
"moduleResolution": "node",
"sourceMap": true,
"emitDecoratorMetadata": true,
"experimentalDecorators": true,
"removeComments": false,
"noImplicitAny": false
},
ANGULAR 2 — ENVIRONMENT
7. Angular 2
6
"exclude": [
"node_modules",
"typings/main",
"typings/main.d.ts"
]
}
Step 3: Create a typings.json file in your project folder angular2-demo as shown below:
typings.json
{
"globalDependencies": {
"core-js": "registry:dt/core-js#0.0.0+20160602141332",
"jasmine": "registry:dt/jasmine#2.2.0+20160621224255",
"node": "registry:dt/node#6.0.0+20160621231320"
}
}
A large number of libraries of the JavaScript extends JavaScript environment with features
and syntax which is not natively recognized by the TypeScript compiler. The typings.json file
is used to identify TypeScript definition files in your Angular application.
In the above code, there are three typing files as shown below:
core-js: It brings ES2015/ES6 capabilities to our ES5 browsers.
jasmine: It is the typing for Jasmine test framework.
node: It is used for the code that references objects in the nodejs environment.
These typing files are used in the development of larger Angular applications.
Step 4: Add the package.json file to your angular2-demo project folder with the code given
below:
package.json
{
"name": "angular2-demo",
"version": "1.0.0",
"scripts": {
8. Angular 2
7
"start": "concurrent "npm run tsc:w" "npm run lite" ",
"tsc": "tsc",
"tsc:w": "tsc -w",
"lite": "lite-server",
"typings": "typings",
"postinstall": "typings install"
},
"license": "ISC",
"dependencies": {
"angular2": "2.0.0-beta.7",
"systemjs": "0.19.22",
"es6-promise": "^3.0.2",
"es6-shim": "^0.33.3",
"reflect-metadata": "0.1.2",
"rxjs": "5.0.0-beta.2",
"zone.js": "0.5.15"
},
"devDependencies": {
"concurrently": "^2.0.0",
"lite-server": "^2.1.0",
"typescript": "^1.7.5",
"typings":"^0.6.8"
}
}
The package.json will contain the packages that our apps require. These packages are
installed and maintained with npm (Node Package Manager). To install npm click here.
Step 5: To install packages, run the npm command in the command prompt as given below.
npm install
Error messages in red may appear while installing npm. These messages have to be ignored.
9. Angular 2
8
CreatingOurFirstAngularComponent
A component is the fundamental concept of Angular. A component is a class that controls a
view template - a part of a web page where information to the user is displayed and user
feedback is responded to. Components are required to build Angular apps.
Step 6: Create a sub-folder called app/ inside your project folder to place the Angular app
components. You can use the following command to create the folder:
mkdir app
cd app
Step 7: The files which you create need to be saved with the .ts extension. Create a file
called environment_app.component.ts in your app/ folder with the below code:
environment_app.component.ts
import {Component, View} from "angular2/core";
@Component({
selector: 'my-app'
})
@View({
template: '<h2>My First Angular 2 App</h2>'
})
export class AppComponent {
}
[[
The above code will import the Component and the View package
from angular2/core.
The @Component is an Angular 2 decorator that allows you to associate metadata
with the component class.
The my-app can be used as HTML tag and also as a component.
The @view contains a template that tells Angular how to render a view.
The export specifies that, this component will be available outside the file.
10. Angular 2
9
Step 8: Next, create the environment_main.ts file with the following code:
environment_main.ts
import {bootstrap} from "angular2/platform/browser"
import {AppComponent} from "./environment_app.component"
bootstrap(AppComponent);
11. Angular 2
10
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