AngularJS Events

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AngularJS has its own HTML events directives.

AngularJS Events

You can add AngularJS event listeners to your HTML elements by using one or more of these directives:

ng-blur
ng-change
ng-click
ng-copy
ng-cut
ng-dblclick
ng-focus
ng-keydown
ng-keypress
ng-keyup
ng-mousedown
ng-mouseenter
ng-mouseleave
ng-mousemove
ng-mouseover
ng-mouseup
ng-paste

The event directives allows us to run AngularJS functions at certain user events.

An AngularJS event will not overwrite an HTML event, both events will be executed.

Mouse Events

Mouse events occur when the cursor moves over an element, in this order:

ng-mouseover
ng-mouseenter
ng-mousemove
ng-mouseleave

Or when a mouse button is clicked on an element, in this order:

ng-mousedown
ng-mouseup
ng-click

You can add mouse events on any HTML element.

Example

Increase the count variable when the mouse moves over the H1 element:

<div ng-app="myApp" ng-controller="myCtrl">

<h1 ng-mousemove="count = count + 1">Mouse over me!</h1>

<h2>{{ count }}</h2>

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

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The ng-click Directive

The ng-click directive defines AngularJS code that will be executed when the element is being clicked.

Example

<div ng-app="myApp" ng-controller="myCtrl">

<button ng-click="count = count + 1">Click me!</button>

<p>{{ count }}</p>

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

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You can also refer to a function:

Example

<div ng-app="myApp" ng-controller="myCtrl">

<button ng-click="myFunction()">Click me!</button>

<p>{{ count }}</p>

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

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Toggle, True/False

If you want to show a section of HTML code when a button is clicked, and hide when the button is clicked again, like a dropdown menu, make the button behave like a toggle switch:

<div ng-app="myApp" ng-controller="myCtrl">

<button ng-click="myFunc()">Click Me!</button>

<div ng-show="showMe">
<h1>Menu:</h1>
<div>Pizza</div>
<div>Pasta</div>
  <div>Pesce</div>
</div>

</div>
<script>
var app = angular.module('myApp', []);
app.controller('myCtrl', function($scope) {
  $scope.showMe = false;
  $scope.myFunc = function() {
    $scope.showMe = !$scope.showMe;
  }
});
</script>

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The showMe variable starts out as the Boolean value false.

The myFunc function sets the showMe variable to the opposite of what it is, by using the ! (not) operator.

$event Object

You can pass the $event object as an argument when calling the function.

The $event object contains the browser's event object:

Example

<div ng-app="myApp" ng-controller="myCtrl">

<h1 ng-mousemove="myFunc($event)">Mouse Over Me!</h1>

<p>Coordinates: {{x + ', ' + y}}</p>

</div>
<script>
var app = angular.module('myApp', []);
app.controller('myCtrl', function($scope) {
$scope.myFunc = function(myE) {
    $scope.x = myE.clientX;
    $scope.y = myE.clientY;
  }
});
</script>

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