About AngularJs ng-change event/directive usage-JS Tutorial-php.cn

This article mainly introduces the summary of AngularJs ng-change events/commands. The editor thinks it is quite good, so I will share it with you now and give it as a reference. Let’s follow the editor to take a look, I hope it can help everyone.

Definition and Usage

The ng-change directive is used to tell AngularJS what to do when the value of an HTML element changes.

The ng-change directive needs to be used with the ng-model directive.

AngularJS ng-change directive will not override the native onchange event. If this event is triggered, both the ng-change expression and the native onchange event will be executed.

ng-change event is triggered every time the value changes, it does not need to wait for a completed modification process, or wait for the action to lose focus.

ng-change event is only for actual modification of the input box value, not modification through JavaScript.

Syntax

<element ng-change="expression"></element>

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, elements are supported. </p></li><li><p><radio>,<checkbox></p></li></ol><p>Parameter value</p><table><tbody><tr class="firstRow"><th> Value</th><th>Description</th></tr><tr><td>expression</td><td>Execute expression when the element value changes. </td></tr></tbody></table><p>Example description: Execute function when the value of the input box changes:</p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><body ng-app="myApp"> <p ng-controller="myCtrl"> <input type="text" ng-change="myFunc()" ng-model="myValue" /> <p>The input field has changed {{count}} times.</p> </p> <script> angular.module('myApp', []) .controller('myCtrl', ['$scope', function($scope) { $scope.count = 0; $scope.myFunc = function() { $scope.count++; }; }]); </script> </body></pre><div class="contentsignin">Copy after login</div></div><p>Example description, radio and checkbox</p><p>Note: checkbox ng-model is always true or false, not value. Other ng-models default to the value of value</p><p>HTML</p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><h3>Radio 控件测试</h3> <p><label> <input type="radio" value="男" name="sex" ng-model="value1" ng-change="radioChecked()" /> 男 </label> <label> <input type="radio" value="女" name="sex" ng-model="value1" ng-change="radioChecked()" /> 女 </label></p> <h3>checked 控件测试</h3> <p><p class="checkbox"> <label> <input name="agree" type="checkbox" value="同意" ng-model="value2" ng-change="checkboxClick()" /> 同意协议 </label> </p> <p class="checkbox"> <label> <input name="agree" type="checkbox" value="同意2" ng-model="value2" ng-change="checkboxClick()" /> 同意协议2 </label> </p></p></pre><div class="contentsignin">Copy after login</div></div><p>JS：</p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:js;">var app = angular.module('myApp', []); app.controller('validateCtrl', function ($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><div class="contentsignin">Copy after login</div></div><p>Example description , text, select</p><p>HTML</p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><form class="form-horizontal"> <p class="form-group"> <label class="control-label">姓名：</label> <input type="text" class="form-control" ng-model="name" ng-change="txtChange();" /> </p> <p class="form-group"> <label class="control-label">选择年级：</label> <select class="form-control" ng-change="selectChange();" ng-model="grade"> <option value="1">一年级</option> <option value="2">二年级</option> </select> </p> </form></pre><div class="contentsignin">Copy after login</div></div><p>JS</p><div class="code" style="position:relative; padding:0px; margin:0px;"><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><div class="contentsignin">Copy after login</div></div><p>Related recommendations:<br></p> <p><a href="http://www.php.cn/js-tutorial-383453.html" target="_self">Tutorial on the method of controller inheritance in AngularJS </a></p> <p><a href="http://www.php.cn/js-tutorial-383009.html" target="_self">AngularJs Ultimate Shopping Cart Implementation Method</a></p> <p><a href="http://www.php.cn/js-tutorial-382993.html" target="_self">About the implementation of the star rating system of Angularjs rendering using directive</a></p><p>The above is the detailed content of About AngularJs ng-change event/directive usage. 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