对象中的 ng-options 和 ng-model 作为数据源

Question

我有一个select，我想用ng-options 填充它。选项的来源不是array，而是object。到目前为止一切顺利。

这个select 也有ng-model。也就是说当模型的属性取值时，select需要根据取值来改变选中的option。

问题是选中的option 总是第一个（空`选项），就像在这个演示中一样：

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：resources.type = '4' 和 resources.type = 4 我都试过了，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，所以请在将其标记为重复之前再次阅读该问题。

Answer 1

你需要在你的[ng-repeat]中使用track by $index

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>