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AngularJS | Expressions

AngularJS Expressions


Hello folks! welcome back to a new section of our tutorial on AngularJS. In this tutorial, we're going to be studying about AngularJS Expressions.

Expressions binds application data to Html. Expressions are written inside double curly braces such as {{expression}}. Expressions acts similar to ngbind directives. AngularJS expressions are pure JavaScript expression and output the data where they are used.

Numbers

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

Strings

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

Object

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

Array

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


Example

The following example illustrates the use of all the above mentioned expressions -

Create a file testAngularJS.html.

<html>
   <head>
      <title>AngularJS Expressions</title>
   </head>
   
   <body>
      <h1>Sample Application</h1>
      
      <div ng-app = "" ng-init = "quantity = 1;cost = 30; 
         student = {firstname:'Kennedy',lastname:'Nkpara',rollno:102};
         marks = [80,90,75,73,60]">
         <p>Hello {{student.firstname + " " + student.lastname}}!</p>
         <p>Expense on Books : {{cost * quantity}} USD</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 the file testAngularJS.html in any web browser of your choice to see the result -

  

Sample Application

Hello Kennedy Nkpara!

Expense on Books : 30 USD

Roll No: 102

Marks(Math): 73



Alright guys! This is where we are going to be rounding up for this tutorial. In our next tutorial, we are going to be studying about AngularJS Controllers.

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