angular js 事件-优快云博客

本文介绍AngularJS中内置的DOM事件绑定方法及其使用示例，并深入探讨如何通过$broadcast和$emit实现自定义事件的传播。

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（1）angular js支持的事件

ng-click
ng-dbl-click
ng-mousedown
ng-mouseenter
ng-mouseleave
ng-mousemove
ng-keydown
ng-keyup
ng-keypress
ng-change

（2）实例

点击按钮，实现“测试”的显示与隐藏

<!DOCTYPE html>
<html ng-app="testEvent">
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
</head>
<body ng-controller="myctrl">
<span ng-hide="isHide">测试</span>
<button ng-click="toggle()">隐藏/显示</button>


<script src="http://apps.bdimg.com/libs/angular.js/1.4.6/angular.min.js"></script>
<script>
    var app = angular.module(
            "testEvent",
            []
    );
    app.controller("myctrl",function($scope){
        $scope.isHide = false;

        $scope.toggle = function(){
            $scope.isHide = !$scope.isHide;
        }
    });
</script>
</body>
</html>

（3）自定义事件传播

1.前提

必须有controller嵌套，否则无法接收事件

<div ng-controller="ParentCtrl">

   <div ng-controller="SelfCtrl">

     <a class="btn" ng-click="click()">click me</a>
     <div ng-controller="ChildCtrl"></div>

   </div>

   <div ng-controller="BroCtrl"></div>
</div>

这里四个controller的层级关系如下：

所有的事件都是从SelfCtrl发出

2.$broadcast

事件发送的方法：

$scope.$broadcast

事件的接收方法：

$scope.$on

broadcast是从发送者向他的子scope发送事件的一个方法，所以父scope不会收到

angular.module('TestApp', ['ng'])
.controller('ParentCtrl', function($scope) {
 $scope.$on('to-child', function(e, d) {
   console.log('关我毛事');
 });
})
.controller('SelfCtrl', function($scope) {
  $scope.click = function () {
    $scope.$broadcast('to-child', 'haha');
  }
})
.controller('ChildCtrl', function($scope){
  $scope.$on('to-child', function(e, d) {
    console.log('I\' the child, I got it', d);
  });
})
.controller('BroCtrl', function($scope){
  $scope.$on('to-child', function(e, d) {
    console.log('关我毛事');
  });
})
;

3.$emit

事件发送的方法：

$scope.$broadcast

只有父scope能够收到

angular.module('TestApp', ['ng'])
.controller('ParentCtrl', function($scope) {
 $scope.$on('to-parent', function(e, d) {
    console.log('we are the parent, I got it', d);
 });
})
.controller('SelfCtrl', function($scope) {
  $scope.click = function () {
    $scope.$emit('to-parent', 'hehe');
  }
})
.controller('ChildCtrl', function($scope){
  $scope.$on('to-parent', function(e, d) {
   console.log('关我毛事');
  });
})
.controller('BroCtrl', function($scope){
  $scope.$on('to-parent', function(e, d) {
    console.log('关我毛事');
  });
})
;

4.说明
不管是$broadcast还是$emit，兄弟controller永远都不会收到事件