javascript - Angular js ng-class错误条件在ng-repeat中不起作用

Question

如果选择了 radio，我想突出显示 li。在 ng-repeat 中，ng-class true 条件有效，但 false 条件无效，请检查下面的代码

<div ng-init="friends = [
        {name:'John', age:25, gender:'boy'},
        {name:'Jessie', age:30, gender:'girl'},
        {name:'Johanna', age:28, gender:'girl'},
        {name:'Joy', age:15, gender:'girl'},
        {name:'Mary', age:28, gender:'girl'},
        {name:'Peter', age:95, gender:'boy'},
        {name:'Sebastian', age:50, gender:'boy'},
        {name:'Erika', age:27, gender:'girl'},
        {name:'Patrick', age:40, gender:'boy'},
        {name:'Samantha', age:60, gender:'girl'}
      ]">
        <ul class="example-animate-container">
          <li class="animate-repeat" ng-repeat="friend in friends" ng-class="{true:'hightlight',false:''}[radioBox==friend.name]">
             <input type="radio" name="friends" ng-model="radioBox" value="{{friend.name}}" />
          </li>
        </ul>
      </div>

Answer 1

这是因为 ng-repeat 为每个 li 元素创建了一个新的子作用域，因此每个 li 元素都有自己的 radioBox 值在它自己的范围内。

有关更多详细信息，请阅读 Understanding-Scopes .

你可以通过在你的 ng-model 中加入 . 来避免这个问题，例如使用 model.radioBox 像这样:

<li class="animate-repeat" ng-repeat="friend in friends" ng-class="{true:'hightlight',false:''}[model.radioBox==friend.name]">
  <input type="radio" name="friends" ng-model="model.radioBox" value="{{friend.name}}" />
</li>

然后在您的 Controller 中，预先初始化模型:

$scope.model = {
  radioBox: undefined
};

示例 Plunker: http://plnkr.co/edit/TcOrxhSzYtN2KCxF2M3g?p=preview