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 = "https://ajax.googleapis.com/ajax/libs/angularjs/1.3.14/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>
   <head>
      <title>AngularJS First Application</title>
   </head>
   
   <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 = "https://ajax.googleapis.com/ajax/libs/angularjs/1.3.14/angular.min.js">
      </script>
      
   </body>
</html>

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

Live Demo

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 <span> tag whenever user enters input in the text box.
Closing</div> tag indicates the end of AngularJS application.

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