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AngularJS ng-change 指令


示例

当输入字段的值更改时执行函数

<body ng-app="myApp">

<div ng-controller="myCtrl">
    <input type="text" ng-change="myFunc()" ng-model="myValue" />
    <p>输入字段已更改 {{count}} 次。</p>
</div>

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

</body>
亲自试一试 »

定义和用法

ng-change 指令告诉 AngularJS 在 HTML 元素的值更改时该做什么。

ng-change 指令要求存在 ng-model 指令。

AngularJS 的 ng-change 指令不会覆盖元素的原始 onchange 事件, ng-change 表达式和原始 onchange 事件都将被执行。

ng-change 事件在每次值更改时触发。它不会等到所有更改完成,或者输入字段失去焦点。

ng-change 事件仅在输入值发生实际更改时触发,如果更改是由 JavaScript 引起的则不会触发。


语法

<元素 ng-change="表达式"></元素>

受 <input>、<select> 和 <textarea> 支持。


参数值

描述
表达式 当元素的值更改时要执行的表达式。

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