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:

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:

  1. ng-mouseenter
  2. ng-mouseover
  3. ng-mousemove
  4. ng-mouseleave

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

  1. ng-mousedown
  2. ng-mouseup
  3. ng-click

You can add mouse events on any HTML element.

例

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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ng-click Directive

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

例

<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:

例

<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:

Pizza
Pasta
Pesce

例

<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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showMe variable starts out as the Boolean value false.

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.

$event object contains the browser's event object:

例

<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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