AngularJS Events
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-blurng-changeng-clickng-copyng-cutng-dblclickng-focusng-keydownng-keypressng-keyupng-mousedownng-mouseenterng-mouseleaveng-mousemoveng-mouseoverng-mouseupng-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-mouseenter
- ng-mouseover
- 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() {
$scope.count++;
}
});
</script>
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Toggle, True/False
If you want to show a section of HTML code when a button is clicked, and hide when the button is clicked again, like a dropdown menu, make the button behave like a toggle switch:
Menu:
Example
<div ng-app="myApp" ng-controller="myCtrl">
<button ng-click="myFunc()">Click
Me!</button>
<div ng-show="showMe">
<h1>Menu:</h1>
<div>Pizza</div>
<div>Pasta</div>
<div>Pesce</div>
</div>
</div>
<script>
var app = angular.module('myApp', []);
app.controller('myCtrl', function($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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