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AngularJS Controllers


AngularJS controllers control the data of AngularJS applications.

AngularJS controllers are regular JavaScript Objects.


AngularJS Controllers

AngularJS applications are controlled by controllers.

The ng-controller directive defines the application controller.

A controller is a JavaScript Object, created by a standard JavaScript object constructor.

AngularJS Example

<div ng-app="" ng-controller="personController">

First Name: <input type="text" ng-model="firstName"><br>
Last Name: <input type="text" ng-model="lastName"><br>
<br>
Full Name: {{firstName + " " + lastName}}

</div>

<script>
function personController($scope) {
    $scope.firstName="John",
    $scope.lastName="Doe"
}
</script>

Try it Yourself »

Application explained:

The AngularJS application is defined by ng-app. The application runs inside a <div>.

The ng-controller directive names the controller object.

The personController function is a standard JavaScript object constructor.

AngularJS will invoke personController with a $scope object.

In AngularJS, $scope is the application object (the owner of application variables and functions).

The personController creates two properties (variables) in the scope (firstName and lastName).

The ng-model directives bind the input fields to the controller properties (firstName and lastName).


Controller Methods

The example above demonstrated a controller object with two properties: lastName and firstName.

A controller can also have methods (functions as object properties):

AngularJS Example

<div ng-app="" ng-controller="personController">

First Name: <input type="text" ng-model="firstName"><br>
Last Name: <input type="text" ng-model="lastName"><br>
<br>
Full Name: {{fullName()}}

</div>

<script>
function personController($scope) {
    $scope.firstName = "John",
    $scope.lastName = "Doe",
    $scope.fullName = function() {
        return $scope.firstName + " " + $scope.lastName;
    }
}
</script>

Try it Yourself »


Controllers In External Files

In larger applications, it is common to store controllers in external files.

Just copy the code between the <script> tags into an external file named personController.js:

AngularJS Example

<div ng-app="" ng-controller="personController">

First Name: <input type="text" ng-model="firstName"><br>
Last Name: <input type="text" ng-model="lastName"><br>
<br>
Full Name: {{firstName + " " + lastName}}

</div>

<script src="personController.js"></script>

Try it Yourself »


Another Example

For the next example we will create a new controller file:

function namesController($scope) {
    $scope.names = [
        {name:'Jani',country:'Norway'},
        {name:'Hege',country:'Sweden'},
        {name:'Kai',country:'Denmark'}
    ];
}

And then use the controller file in an application:

AngularJS Example

<div ng-app="" ng-controller="namesController">

<ul>
  <li ng-repeat="x in names">
    {{ x.name + ', ' + x.country }}
  </li>
</ul>

</div>

<script src="namesController.js"></script>

Try it Yourself »

 


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