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Sunday, February 12, 2017

AngularJS - First Application

Before we start with creating actual HelloWorld application using AngularJS, let us see what are the actual 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.

Steps to create 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>

Steps to run AngularJS Application

Use 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>

Output

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

How AngularJS integrates with HTML

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