javascript - angularjs 如何访问其范围之外的 ng-repeat 过滤值

Question

我在我的范围内定义了一个 json

   $scope.People = [  
    {  
          "firstName":"John",
          "lastName":"Doe",
          "Choices":[  
             {  
                "Name":"Dinner",
                "Options":[  
                   {  
                      "Name":"Fish",
                      "ID":1
                   },
                   {  
                      "Name":"Chicken",
                      "ID":2
                   },
                   {  
                      "Name":"Beef",
                      "ID":3
                   }
                ]
             },
             {  
                "Name":"Lunch",
                "Options":[  
                   {  
                      "Name":"Macaroni",
                      "ID":1
                   },
                   {  
                      "Name":"PB&J",
                      "ID":2
                   },
                   {  
                      "Name":"Fish",
                      "ID":3
                   }
                ]
             }
          ]
       },
       {  
          "firstName":"Jane",
          "lastName":"Doe"
       }
    ];

我有一个搜索过滤器，可以搜索选项名称并过滤它们。它工作正常。但我计划在所有 ng-repeat 之外显示过滤的结果数(总结果)。不确定如何将 ng-repeat 的范围获取到其父级。

代码片段:

<div ng-controller="ExampleController">
  <input type="text" ng-model="q" placeholder="filter choices..." /><br/>
  <strong>Not Working :</strong>  I have {{results.length}} filtered results<br/><br/>
    <div ng-repeat="people in People" ng-hide="results.length == 0">
    <strong>Working :</strong>  I have {{results.length}} filtered results
    {{people.firstName}}
    <div ng-repeat="choice in results = (people.Choices | filter:q) ">
    {{ choice.Name }} 
    <select ng-model="choice.SelectedID"                 
           ng-options="option.Name for option in choice.Options"></select> {{choice.SelectedID}}
  </div>

完整代码@ http://plnkr.co/edit/ODW3lD?p=preview

感谢您的回复。

Answer 1

问题是 ng-repeat 创建了一个子作用域，而您正试图从父作用域引用该子作用域中的值。为了解决这个问题，您应该在 Controller 中创建一个 $scope.results = [] 然后执行:

<div ng-repeat="choice in $parent.results = (people.Choices | filter:q) ">

这将强制它将它存储在 $parent 范围(“ExampleController”)中的结果变量中，这是您尝试使用它的地方。

这是一个可以正常工作的 Plunker:

http://plnkr.co/edit/pWua57wTffdX8dinPKRS?p=preview