Sunday, February 12, 2017

AngularJS - Expressions

Expressions are used to bind application data to html. Expressions are written inside double braces like {{ expression}}. Expressions behaves in same way as ng-bind directives. AngularJS application expressions are pure javascript expressions and outputs the data where they are used.

Using numbers

<p>Expense on Books : {{cost * quantity}} Rs</p>

Using strings

<p>Hello {{student.firstname + " " + student.lastname}}!</p>

Using object

<p>Roll No: {{student.rollno}}</p>

Using array

<p>Marks(Math): {{marks[3]}}</p>

Example

Following example will showcase all the above mentioned expressions.
testAngularJS.htm
<html>
   
   <head>
      <title>AngularJS Expressions</title>
   </head>
   
   <body>
      <h1>Sample Application</h1>
      
      <div ng-app = "" ng-init = "quantity = 1;cost = 30; student = {firstname:'Mahesh',lastname:'Parashar',rollno:101};marks = [80,90,75,73,60]">
         <p>Hello {{student.firstname + " " + student.lastname}}!</p>
         <p>Expense on Books : {{cost * quantity}} Rs</p>
         <p>Roll No: {{student.rollno}}</p>
         <p>Marks(Math): {{marks[3]}}</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. See the result.
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