AngularJS Controllers

By | 20th September 2015

AngularJS controllers control the data of AngularJS applications.

AngularJS controllers are regular JavaScript Objects.

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.

Example
<div ng-app=”myApp” ng-controller=”myCtrl”>

First Name: <input type=”text” ng-model=”firstName”>
Last Name: <input type=”text” ng-model=”lastName”>

Full Name: {{firstName + ” ” + lastName}}

</div>

<script>
var app = angular.module(‘myApp’, []);
app.controller(‘myCtrl’, function($scope) {
$scope.firstName = “John”;
$scope.lastName = “Doe”;
});
</script>

Application explained:

The AngularJS application is defined by ng-app=”myApp”. The application runs inside the

.

The ng-controller=”myCtrl” attribute is an AngularJS directive. It defines a controller.

The myCtrl function is a JavaScript function.

AngularJS will invoke the controller with a $scope object.

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

The controller 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).

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