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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.

The $scope of the controller is the application (the HTML element) it is referred from.

AngularJS Example

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

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

</div>

<script>
function personController($scope) {
    $scope.person = {
        firstName: "John",
        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 function personController is a standard JavaScript object constructor.

The controller object has one property: $scope.person.

The person object has two properties: firstName and lastName.

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


Controller Properties

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

A controller can also have functions as object properties:

AngularJS Example

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

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

</div>

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

Try it Yourself »


Controller Methods

A controller can also have methods:

AngularJS Example

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

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

</div>

<script>
function personController($scope) {
    $scope.person = {
        firstName: "John",
        lastName: "Doe",
     };
     $scope.fullName = function() {
         var x;
         x = $scope.person;
         return x.firstName + " " + x.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="person.firstName"><br>
Last Name: <input type="text" ng-model="person.lastName"><br>
<br>
Full Name: {{person.firstName + " " + person.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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