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Expressions are used to bind application data to HTML. Expressions are written inside double curly braces such as in {{ expression}}. Expressions behave similar to ngbind directives. AngularJS expressions are pure JavaScript expressions and output 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
The following example shows the use of 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 the file testAngularJS.htm in a web browser and see the result.
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