javascript - 对象中的 ng-options 和 ng-model 作为数据源

Question

我有一个select，我想使用ng-options来填充它。选项的来源不是数组，而是对象。到目前为止一切顺利。

这个select也有ng-model。这意味着当模型的属性获取值时，选择需要根据该值更改所选的选项。

问题是所选的选项始终是第一个(空`选项)，如本演示所示:

var app = angular.module('app', []);
app.controller('MainCtrl', function($scope) {
  $scope.resourceList = {"0":"Unknown","1":"ILS","2":"USD","3":"AUD","4":"GBP","5":"JPY"};
  $scope.resources = {
    type: 3
  }
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.5/angular.min.js"></script>

<div ng-app="app" ng-controller="MainCtrl">
  {{resources.type}}
  <select ng-model="resources.type" ng-options="key as value for (key, value) in resourceList track by key"></select>
  <button data-ng-click="resources.type = '4'">Replace</button>
</div>

更新:我尝试了resources.type = '4'和resources.type = 4，但它们都不起作用。

注意:我在这里阅读了很多类似主题的问题，但没有找到此特定问题的答案，因此，请在将其标记为重复之前再次阅读该问题。

Answer 1

您需要使用track by $index而是在你的 [ng-repeat] 中

var app = angular.module('app', []);
app.controller('MainCtrl', function($scope) {
  $scope.resourceList = {"0":"Unknown","1":"ILS","2":"USD","3":"AUD","4":"GBP","5":"JPY"};
  $scope.resources = {
    type: 3
  }
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.5/angular.min.js"></script>

<div ng-app="app" ng-controller="MainCtrl">
  {{resources.type}}
  <select ng-model="resources.type" ng-options="key as value for (key, value) in resourceList track by $index"></select>
  <button data-ng-click="resources.type = '4'">Replace</button>
</div>