AngularJS Events Tutorial

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Overview of AngularJS Events
Mouse Events

1- Overview of AngularJS Events

AngularJS is a Javascript library therefore, all event handling ways of the Javascript can apply in the AngularJS. However, the AngularJS proposes a new approach. When an event occurs, a method of $scope will be called instead of a function of Javascript. To do this, the AngularJS provides a list of built-in 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

Note: An event of AngularJS will not overwrite the event of HTML. Both execute, therefore, you need to consider when writing codes like below:

<!-- Both events are executed -->
<button onclick="someFunction(event)" ng-click="someMethod($event)">
   Click me!
</button>

2- Mouse Events

When an user moves the mouse across the surface of an element, events occur in the following order:

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

When an user clicks on elements, the following events will happen in the order:

ng-mousedown
ng-mouseup
ng-click

Example with ng-mouseover, ng-mouseenter, ng-mousemove, ng-mouseleave:

mouseevent-example.html

<!DOCTYPE html>
<html>
   <head>
      <title>AngularJS Mouse Events</title>
      <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.7.2/angular.min.js"></script>
      <script src="mouseevent-example.js"></script>
      <style>
          .my-div  {
            width: 290px;
            height: 100px;
            background: blue;
          }

      </style>
   </head>
   <body>
      <div ng-app="myApp" ng-controller="myCtrl">
         <h3>Mouse Events (Over, Enter, Move, Leave)</h3>

         <div class="my-div"
             ng-mouseover ="mouseoverHandler($event)"
             ng-mouseenter ="mouseenterHandler($event)"
             ng-mousemove ="mousemoveHandler($event)"
             ng-mouseleave ="mouseleaveHandler($event)">
       </div>

        <ol style="color:red;">
            <li>Mouse Over: {{overCount}}</li>
            <li>Mouse Enter: {{enterCount}}</li>
            <li>Mouse Move: {{moveCount}}</li>
            <li>Mouse Leave: {{leaveCount}}</li>
        </ol>

      </div>

   </body>
</html>

mouseevent-example.js

var app = angular.module("myApp", []);

app.controller("myCtrl", function($scope) {


    $scope.overCount = 0;
    $scope.enterCount = 0;
    $scope.moveCount = 0;
    $scope.leaveCount = 0;

    $scope.mouseoverHandler = function($event) {
        $scope.overCount += 1;
    }

    $scope.mouseenterHandler = function($event) {
        $scope.enterCount += 1;
    }

    $scope.mousemoveHandler = function($event) {
        $scope.moveCount += 1;
    }

    $scope.mouseleaveHandler = function($event) {
        $scope.leaveCount += 1;
    }
});

Example with ng-mousedown, ng-mouseup, ng-click:

mouseevent-example2.html

<!DOCTYPE html>
<html>
   <head>
      <title>AngularJS Mouse Events</title>
      <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.7.2/angular.min.js"></script>
      <script src="mouseevent-example2.js"></script>
      <style>
          .my-div  {
            width: 290px;
            height: 100px;
            background: blue;
          }

      </style>
   </head>
   <body>
      <div ng-app="myApp" ng-controller="myCtrl">
         <h3>Mouse Events (mousedown, mouseup, click)</h3>

         <div class="my-div"
             ng-mousedown ="mousedownHandler($event)"
             ng-mouseup ="mouseupHandler($event)"
             ng-click ="clickHandler($event)">
       </div>

        <ol style="color:red;">
            <li>Mouse Down: {{mousedownCount}}</li>
            <li>Mouse Up: {{mouseupCount}}</li>
            <li>Click: {{clickCount}}</li>
        </ol>

      </div>

   </body>
</html>

mouseevent-example2.js

var app = angular.module("myApp", []);

app.controller("myCtrl", function($scope) {


    $scope.mousedownCount = 0;
    $scope.mouseupCount = 0;
    $scope.clickCount = 0;

    $scope.mousedownHandler = function($event) {
        $scope.mousedownCount += 1;
    }

    $scope.mouseupHandler = function($event) {
        $scope.mouseupCount += 1;
    }

    $scope.clickHandler = function($event) {
        $scope.clickCount += 1;
    }
});

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