ng-checked 和 ng-change 单选按钮不能一起工作 - angularjs [英] ng-checked and ng-change radio button not work together - angularjs

问题描述

http://plnkr.co/edit/RP9SpO1qGjn5Ua6pZJ3D?p=preview

js

angular.module("sampleapp", []).controller('samplecontroller', function($scope,$rootScope) {$scope.radii = [{id:.25,checked:false, name:"1/4 Mile"},{id:.5, 检查:false, name:"1/2 Mile"},{id:1, 检查:false, name:"1 Mile"},{id:2, 检查:true, name:"2 Mile"},{id:3, 检查:false, name:"3 Mile"},{id:4, 检查:false, name:"4 Mile"},{id:5, 检查:false, name:"5 Mile"}];$scope.handleRadioClick = function(){警报();};});

和 html

 
<标签><input type="radio" name="radius"ng-change="handleRadioClick()"ng-checked="radius.checked">{{radius.name}}

注意2 英里"无线电输入是根据半径范围结构检查的.为什么ng-change没有触发功能?

如果我添加 ng-model，函数会触发，但 ng-checked 不起作用.

解决方案

这是因为你没有使用 ng-model:

FORKED PLUNKER

<标签><input type="radio" name="radius"ng-change="handleRadioClick(selectedRadius)"ng-model="radius.checked">{{radius.name}}

更新:

很抱歉，我没有注意到您想要选中默认单选按钮，如果是这种情况，那么您采用的方法是不正确的.您必须将模型视为一组单选按钮中的非单个部分，但作为一个整体，它们应该是一个值.您不必使用 ng-repeat 的无线电作用域变量，而是使用另一个 ng-model 作为 selectedRadius 模型.您的输入单选需要有一个值，在这种情况下，我们将使用 ng-value 来确定模型的当前值.

更新 PLUNKER [2014 年 9 月]

JAVASCRIPT

控制器

 $scope.radii = [{id:.25, name:"1/4 Mile"},{id:.5, name:"1/2 Mile"},{id:1, name:"1 Mile"},{id:2, name:"2 Mile"},{id:3, name:"3 Mile"},{id:4, name:"4 Mile"},{id:5, name:"5 Mile"}];//选择的值为 {id:2, name:"2 Mile"}$scope.selectedRadius = $scope.radii[3];

HTML

<标签><input type="radio" name="radius"ng-change="handleRadioClick(radius)"ng-model="selectedRadius"ng-value="半径">{{radius.name}}

更新的 PLUNKER [2015 年 1 月]

下面的

dcz.switcher 问题表明，当重新选择单选按钮时，上述解决方案不会触发 ng-change 事件处理程序.主要问题是 ng-model 指的是 ng-repeat 的范围，而不是第二次更改中的控制器范围.要解决此问题，您可以使用 $parent 属性.另一种方法是使用 controllerAs 别名并使用别名本身来访问控制器的属性.要了解有关 AngularJS 中作用域的更多信息，我建议您阅读更多相关信息在这里.

HTML

<标签><input type="radio" name="radius"ng-change="handleRadioClick($parent.selectedRadius)"ng-model="$parent.selectedRadius"ng-value="半径">{{radius.name}}

http://plnkr.co/edit/RP9SpO1qGjn5Ua6pZJ3D?p=preview

js

angular.module("sampleapp", []).controller('samplecontroller', function($scope,$rootScope) {
  $scope.radii = [
    {id:.25, checked:false, name:"1/4 Mile"},
    {id:.5, checked:false, name:"1/2 Mile"},
    {id:1, checked:false, name:"1 Mile"},
    {id:2, checked:true, name:"2 Mile"},
    {id:3, checked:false, name:"3 Mile"},
    {id:4, checked:false, name:"4 Mile"},
    {id:5, checked:false, name:"5 Mile"}
];

$scope.handleRadioClick = function(){
    alert();

};
});

and html

          <div class="radio">
            <label>
              <input type="radio" name="radius"

                   ng-change="handleRadioClick()"
                   ng-checked="radius.checked">

              {{radius.name}}

            </label>
          </div>

      </li>

Notice "2 Mile" radio input is checked based on the radii scope structure. Why doesn't the ng-change trigger the function?

If I add ng-model, the function triggers but the ng-checked does not work.

解决方案

This is because you are not using ng-model:

FORKED PLUNKER

<div class="radio" ng-repeat="radius in radii" id="selectradius-{{radius.id}}">
  <label>
    <input type="radio" name="radius"

         ng-change="handleRadioClick(selectedRadius)"
         ng-model="radius.checked">

    {{radius.name}}

  </label>
</div>

UPDATE:

I'm sorry that I didn't notice that you wanted to have a default radio button checked, if that is the case then the approach you're taking is incorrect. You must consider the model as non-individual parts in a group of radio buttons but as a whole, they are supposed to be one value instead. You don't have to use ng-repeat's radio scope variable instead use another ng-model as the selectedRadius model. Your input radio needs to have a value, and in this case we'll use ng-value to determine the current value of the model.

UPDATED PLUNKER [2014 September]

JAVASCRIPT

Controller

  $scope.radii = [
    {id:.25, name:"1/4 Mile"},
    {id:.5, name:"1/2 Mile"},
    {id:1, name:"1 Mile"},
    {id:2, name:"2 Mile"},
    {id:3, name:"3 Mile"},
    {id:4, name:"4 Mile"},
    {id:5, name:"5 Mile"}
  ];

  // selected value is {id:2, name:"2 Mile"}
  $scope.selectedRadius = $scope.radii[3];

HTML

<div class="radio" ng-repeat="radius in radii" id="selectradius-{{radius.id}}">
  <label>
    <input type="radio" name="radius"

         ng-change="handleRadioClick(radius)"
         ng-model="selectedRadius"
         ng-value="radius">

    {{radius.name}}

  </label>
</div>

UPDATED PLUNKER [2015 January]

dcz.switcher's problem below suggested that the solution above does not trigger the ng-change event handler when a radio button is reselected. The main problem was that the ng-model was referring to the ng-repeat's scope and not to the controller's scope from the second change. To solve this problem you can use the $parent property. An alternative would be to use controllerAs alias and use the alias itself to access your controller's property. To understand more about scopes in AngularJS, I suggest you read more about it in here.

HTML

<div class="radio" ng-repeat="radius in radii" id="selectradius-{{radius.id}}">
  <label>
    <input type="radio" name="radius"

         ng-change="handleRadioClick($parent.selectedRadius)"
         ng-model="$parent.selectedRadius"
         ng-value="radius">

    {{radius.name}}

  </label>
</div>

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