javascript – 如何在AngularJS中按对象的属性进行过滤?

我有两个对象数组,如下所示:

$scope.countries = [
        {'id' : 1, 'country_name':'India'},
        {'id' : 10, 'country_name':'Australia'},
        {'id' : 2, 'country_name':'England'}
    ];
$scope.states = [
        {'state_id' : 1, 'state_name':'Delhi', 'country_id':{'id':1 ,'country_name':'India'}},
        {'state_id' : 5, 'state_name':'London', 'country_id':{'id':2 ,'country_name':'England'}},
        {'state_id' : 2, 'state_name':'Victoria', 'country_id':{'id':10 ,'country_name':'Australia'}}
    ];

我正在尝试根据country_id对象中的id过滤状态,如下所示:

<select ng-model="sellerCountry" ng-options="item.id as item.country_name for item in countries" required>
    <option value="">Select Country</option>
</select>   

<select ng-model="sellerState" ng-options="item.id as item.state_name for item in states | filter : {country_id: { id : sellerCountry}, }" ng-disabled="!sellerCountry">
    <option value="">Select State</option>
</select>

在这里,当我从第一个选择框中选择印度(其中id = 1)时,我应该只在第二个选择中显示德里,但它显示德里(country_id.id = 1)和维多利亚(country_id.id = 10)

需要帮助来解决这个问题.提前致谢.

最佳答案 默认情况下,过滤器包含搜索,您应该通过将第3个参数传递给true来进行严格比较.

 ng-options="item.id as item.state_name for item in states
               | filter : {country_id: { id : sellerCountry} }: true"

Demo Plunker

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