AngularJs ng-change事件/指令的用法小结

本文介绍了AngularJs ng-change事件/指令的小结，分享给大家，也给自己留个笔记

定义和用法

ng-change 指令用于告诉 AngularJS 在 HTML 元素值改变时需要执行的操作。

ng-change 指令需要搭配 ng-model 指令使用。

AngularJS ng-change 指令指令不会覆盖原生的 onchange 事件, 如果触发该事件，ng-change 表达式与原生的 onchange 事件都会执行。

ng-change 事件在值的每次改变时触发，它不需要等待一个完成的修改过程，或等待失去焦点的动作。

ng-change 事件只针对输入框值的真实修改，而不是通过 Javascript 来修改。

语法

, 元素支持。</li> <li><radio>,<checkbox></li> </ol> <p>参数值</p> <p> <table> <tbody> <tr> <th>值</th> <th>描述</th> </tr> <tr> <td>expression</td> <td>元素值改变时执行表达式。</td> </tr> </tbody> </table> </p> <p>实例说明：当输入框的值改变时执行函数:<br /> </p> <pre class="brush:xhtml;"> <body ng-app="myApp"> <input type="text" ng-change="myFunc()" ng-model="myValue" /> <p>The input field has changed {{count}} times.</p> </body> </pre> <p>实例说明，radio和checkbox</p> <p>注：checkbox ng-model总是是true或false，而不是value，其他的ng-model默认都是value 的值</p> <p>HTML</p> <pre class="brush:xhtml;"> Radio 控件测试 <p><label> <input type="radio" value="男" name="sex" ng-model="value1" ng-change="radioChecked()" /> 男 </label> <label> <input type="radio" value="女" name="sex" ng-model="value1" ng-change="radioChecked()" /> 女 </label></p> checked 控件测试 <p> <label> <input name="agree" type="checkbox" value="同意" ng-model="value2" ng-change="checkboxClick()" /> 同意协议 </label> <label> <input name="agree" type="checkbox" value="同意2" ng-model="value2" ng-change="checkboxClick()" /> 同意协议2 </label> </p> </pre> <p>JS：</p> <pre class="brush:js;"> var app = angular.module('myApp', []); app.controller('validateCtrl', function ($scope) { //randio ng-change事件和原始onchange相同 //radio ng-model 的值是value $scope.radioChecked = function () { console.info($scope.value1); } //checkbox ng-change事件和原始onchange相同 //checkbox ng-model总是是true或false $scope.checkboxClick = function () { console.info($scope.value2); } }); </pre> <p>实例说明，text，select</p> <p>HTML</p> <pre class="brush:xhtml;"> </pre> <p>JS</p> <pre class="brush:js;"> var app = angular.module('myApp', []); app.controller('validateCtrl', function ($scope) { //textbox 的ng-change事件和原始ng-change不相同，而是和$scope.$watch()监听相同 //textbox 的ng-model为当前输入框的内容，为value值 $scope.txtChange = function () { console.info($scope.name); } //select 的ng-change事件和原始ng-change相同 //ng-model 的默认情况下ng-model的结果为value值 $scope.selectChange = function () { console.info($scope.grade); } }); </pre> 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