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AngularJS binds data to HTML using Expressions.

AngularJS Expressions

AngularJS expressions can be written inside double braces: {{ expression }}.

AngularJS expressions can also be written inside a directive: ng-bind="expression".

AngularJS will resolve the expression, and return the result exactly where the expression is written.

AngularJS expressions are much like JavaScript expressions: They can contain literals, operators, and variables.

Example {{ 5 + 5 }} or {{ firstName + " " + lastName }}

Example

<!DOCTYPE html>
<html>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.9/angular.min.js"></script>
<body>

<div ng-app="">
  <p>My first expression: {{ 5 + 5 }}</p>
</div>

</body>
</html>

If you remove the ng-app directive, HTML will display the expression as it is, without solving it:

Example

<!DOCTYPE html>
<html>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.9/angular.min.js"></script>
<body>

<div>
  <p>My first expression: {{ 5 + 5 }}</p>
</div>

</body>
</html>


You can write expressions wherever you like, AngularJS will simply resolve the expression and return the result.

Example: Let AngularJS change the value of CSS properties.

Change the color of the input box below, by changing its value:

lightblue

Example

<div ng-app="" ng-init="myCol='lightblue'">

<input style="background-color:{{myCol}}" ng-model="myCol">

</div>

 

AngularJS Numbers

AngularJS numbers are like JavaScript numbers:

Example

<div ng-app="" ng-init="quantity=1;cost=5">

<p>Total in dollar: {{ quantity * cost }}</p>

</div>
 

Same example using ng-bind:

Example

<div ng-app="" ng-init="quantity=1;cost=5">

<p>Total in dollar: <span ng-bind="quantity * cost"></span></p>

</div>

 

Using ng-init is not very common. You will learn a better way to initialize data in the chapter about controllers.

AngularJS Strings

AngularJS strings are like JavaScript strings:

Example

<div ng-app="" ng-init="firstName='John';lastName='Doe'">

<p>The name is {{ firstName + " " + lastName }}</p>

</div>


Same example using ng-bind:

Example

<div ng-app="" ng-init="firstName='John';lastName='Doe'">

<p>The name is <span ng-bind="firstName + ' ' + lastName"></span></p>

</div>


AngularJS Objects

AngularJS objects are like JavaScript objects:

Example

<div ng-app="" ng-init="person={firstName:'John',lastName:'Doe'}">

<p>The name is {{ person.lastName }}</p>

</div>

Same example using ng-bind:

Example

<div ng-app="" ng-init="person={firstName:'John',lastName:'Doe'}">

<p>The name is <span ng-bind="person.lastName"></span></p>

</div>

AngularJS Arrays

AngularJS arrays are like JavaScript arrays:

Example

<div ng-app="" ng-init="points=[1,15,19,2,40]">

<p>The third result is {{ points[2] }}</p>

</div>

Same example using ng-bind:

Example

<div ng-app="" ng-init="points=[1,15,19,2,40]">

<p>The third result is <span ng-bind="points[2]"></span></p>

</div>

AngularJS Expressions vs. JavaScript Expressions

Like JavaScript expressions, AngularJS expressions can contain literals, operators, and variables.

Unlike JavaScript expressions, AngularJS expressions can be written inside HTML.

AngularJS expressions do not support conditionals, loops, and exceptions, while JavaScript expressions do.

AngularJS expressions support filters, while JavaScript expressions do not.

Learn about JavaScript in our .

 
AngularJS Expressions
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