Microsoft Dot Net Master: AngularJS

Monday, March 9, 2015

AngularJS - First Application

Before creating actual Hello World ! application using AngularJS, let us see the parts of a AngularJS application. An AngularJS application consists of following three important parts:

ng-app : This directive defines and links an AngularJS application to HTML.
ng-model : This directive binds the values of AngularJS application data to HTML input controls.
ng-bind : This directive binds the AngularJS Application data to HTML tags.

Creating AngularJS Application

Step 1: Load framework

Being a pure JavaScript framework, it can be added using <Script> tag.

<script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.2.15/angular.min.js">
</script>

Step 2: Define AngularJS application using ng-app directive.

<div ng-app="">
...
</div>

Step 3: Define a model name using ng-model directive.

<p>Enter your Name: <input type="text" ng-model="name"></p>

Step 4: Bind the value of above model defined using ng-bind directive.

<p>Hello <span ng-bind="name"></span>!</p>

Executing AngularJS Application

Use the above-mentioned three steps in an HTML page.

testAngularJS.htm

<html>
<title>AngularJS First Application</title>
<body>
<h1>Sample Application</h1>
<div ng-app="">
   <p>Enter your Name: <input type="text" ng-model="name"></p>
   <p>Hello <span ng-bind="name"></span>!</p>
</div>
<script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.2.15/angular.min.js"></script>
</body>
</html>

Output

Open the file testAngularJS.htm in a web browser. Enter your name and see the result.

How AngularJS Integrates with HTML

The ng-app directive indicates the start of AngularJS application.
The ng-model directive creates a model variable named name, which can be used with the HTML page and within the div having ng-app directive.
The ng-bind then uses the name model to be displayed in the HTML tag whenever user enters input in the text box.
Closing</div> tag indicates the end of AngularJS application.

Microsoft Dot Net Master