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AngularJS ng-change Directive


Example

Execute a function when the value of the input field changes:

<body ng-app="myApp">

<div ng-controller="myCtrl">
    <input type="text" ng-change="myFunc()" ng-model="myValue" />
    <p>The input field has changed {{count}} times.</p>
</div>

<script>
angular.module('myApp', [])
.controller('myCtrl', ['$scope', function($scope) {
    $scope.count = 0;
    $scope.myFunc = function() {
        $scope.count++;
    };
}]);
</script>

</body>
Try it Yourself »

Definition and Usage

The ng-change directive tells AngularJS what to do when the value of an HTML element changes.

The ng-change directive requires a ng-model directive to be present.

The ng-change directive from AngularJS will not override the element's original onchange event, both the ng-change expression and the original onchange event will be executed.

The ng-change event is triggered at every change in the value. It will not wait until all changes are made, or when the input field loses focus.

The ng-change event is only triggered if there is a actual change in the input value, and not if the change was made from a JavaScript.


Syntax

<element ng-change="expression"></element>

Supported by <input>, <select>, and  <textarea>.


Parameter Values

Value Description
expression An expression to execute when an element's value changes.