An Overview of Angular 4

Angular
( formerly Angular 4 )
One framework.
Mobile & desktop.

 Introduction of Angular.
 Features of Angular.
 Development environment setup.
 Project setup
 Structure of Angular project.
 How to install packages.
 What is TypeScript .
 How Angular application start.
 Components.
 How to create component.
 Styling component.
 Component selector.
 Databinding
Agenda

• Angular is an open source JavaScript framework that is used to
build single page based web applications.
• Developed by Google
• Release Date - March 2017
• One framework. Mobile & Desktop.
Angular

Cross
Platform
Speed and
Performance
Productivity Development
Features of Angular

Cross Platform
 Angular use modern web platform capabilities to deliver app-like experiences.
 High performance and zero-step installation.
 Build native mobile apps with Ionic Framework, NativeScript, and React Native.
 Create desktop - installed apps across Mac, Windows, and Linux.

Speed and Performance
 Angular turns our templates into code that's highly optimized for today's JavaScript
machines.
 Serve the first view of your application on node.js, .NET, PHP, and other servers for
rendering in just HTML and CSS. .
 Angular apps load quickly with the new Component Router.

Productivity
 Quickly create UI views with simple and powerful template syntax.
 Command line tools:
 Start building fast
 Add components and tests
 Then instantly deploy.
 Get intelligent code completion, instant errors in popular editors and IDEs.

Full Development Story
 Karma for unit tests.
 Protractor makes our scenario tests run faster and in a stable manner.
 Create high-performance, complex choreographies and animation timelines
with very little code through Angular's intuitive API.

Development Environment Setup
https://nodejs.org/en/download/
Node.js
• Node.js is an open-source, cross-platform JavaScript run-time environment for
executing JavaScript code server-side.
• Download latest version i.e. node v6.10.3
Syntax : - node -v
Check node.js version
• This command is used for checking
current installed version of node.

Syntax : - npm -vCheck npm version
• This command is used for checking
current installed version of Node Package
Manager (npm).
Text Editor
• Visual Studio Code, WebStrome , Sublime or any other text editor IDE

Project Setup
Install Angular CLI Angular CLI is command line interface for Angular
 Open node js command prompt in admin mode.
Syntax : - npm install –g <packagename>
F:/Angular4> npm install –g @angular/cli Node.js command prompt
Current working directory
Globally
Package Name

Step 2 Creating project using Angular CLI
Syntax : - ng new <project_name>
F:/Angular4> ng new MyFirstDemoApp Node.js command prompt
Current working directory
Project Name

Step 3 Enter into newly created project folder i.e. MyFirstDemoApp
Step 4 Run application
Syntax : - ng serve
F:/Angular4/MyFirstDemoApp> ng serve
 ng serve command is used for to run application.

Step 5 Open web browser - localhost:4200

Structure of project
NPM is the node package manager, which installs packages
locally into a project, specifically, into the node_modules
folder.
All images, stylesheets, JavaScript or third party libraries reside in
assets
Configuration Files
Root project folder, all components reside is app
folder.
Entry point of application

Installing Packages
npm install command is used for installing packages.
Syntax
npm install <package_name>
Example
F:/Angular4/MyFirstDemoApp> npm install bootsrap

How App Start
main.ts • Main.ts file is entry point of our application.
• Main.ts file bootstrap app.module.ts file
app.module.ts • This file bootstrap our first component i.e
app.component.ts
app.component.ts • This file render app.component.html file.
app.component.html • Final HTML template

TypeScript
 TypeScript is a free and open source programming language.
 It is developed and maintained by Microsoft.
 It is syntactical superset of JavaScript and adds optional static typings and class
based object oriented programming to the language.

Components
A Component consists of the following −
 Components are a logical piece of code for Angular application.
Component
Template Class Metadata
 Template is used to render
the view for the application.
 This contains the HTML that
needs to be rendered in the
application.
 This is like a class defined in any
language such as C#.
 This has the code which is used
to support the view.
 It is defined in TypeScript.
 This has the extra data
defined for the Angular class.
 It is defined with a decorator.

Decorator
Defines the name of the HTML tag.
It holds our HTML template.
The styles option is used to
style a specific component
 Defining a class called
AppComponent.
 The export keyword is used so that
the component can be used in other
modules in the application.
 title is the name of the property.
 The property is given a value of
‘app’.
We are using the import keyword to
import the ‘Component’ decorator
from the angular/core module.

Creating Component
 ng generate command is used for create component.
Syntax
ng generate component <component_name>
or
ng g c <component_name>
Example
F:/Angular4/MyFirstDemoApp>
ng g c server

Component Selector
By Element
Syntax
@Component({
selector: '[selector-name]',
templateUrl: ‘html - template',
styleUrls: [‘stylesheet']
})
Example
@Component({
selector: '[app-root]',
templateUrl: './app.component.html',
styleUrls: ['./app.component.css']
})
<div selector_name> </div> <div app-root> </div>
Define by square brackets [ ] in selector name.

By Class
Syntax
@Component({
selector: ‘.selector-name',
templateUrl: ‘html - template',
styleUrls: [‘stylesheet']
})
Example
@Component({
selector: ‘.app-root',
templateUrl: './app.component.html',
styleUrls: ['./app.component.css']
})
<div class =“selector-name”>
</div>
<div class=“app-root”> </div>
Define by dot ( . ) in selector name.

Data binding
 Data binding is communication between business logic and views.
Typescript
Code
(Business
Logic)
Template
(HTML)
Data binding = Communication
Output Data
String Interpolation => {{ data }}
Property Binding => [property] = “ data “

String Interpolation Interpolation markup is used to provide data-binding to text and attribute values.
Syntax
export class <class_name>
{
variableName = ‘any string';
}
Example
export class AppComponent
{
title = ‘This is my demo app';
}
<div {{variableName }} >
</div>
<div {{ title }} > </div>

Property Binding
HTML
<button [disabled]="!isActive"
class="btn">ADD</button>
Typescript
export class ClientComponent {
isActive = false;
constructor() {
setTimeout(() =>
{ this.isActive = true; }, 2000); }
ngOnInit() { }
Property binding allow us to bind values to properties of an element to modify their
behavior or appearance. This can include properties such as class, disabled, href or
textContent.

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