使用angularjs級聯下拉菜單

Question

Im試圖級聯我的下拉框與另一個下拉菜單。因此，第二個下拉列表將列出與第一個下拉框中選擇的項目相關的選項。我嘗試過一個示例代碼，下拉菜單仍然是空的。

HTML：

<ion-view view-title="Car Type"> 
    <ion-content ng-app="CarWash" ng-contorller="carBrand"> 
    <h3> Add/Edit the Car Types </h3> 
    Make: 
     <select id="brand" ng-model="carBrand" ng-options="brand for (brand,item) in brandList"> 
      <option value=''>Select</option> 
     </select> 

Type: 
<select id="makeType" ng-model="brandType" ng-options="item for (brand,item) in brandlist"> 
    <option value=''>Select</option> 
</select> 
    </ion-content> 
</ion-view> 

控制器：

[angular.module('CarWash',\[\]).controller('carBrand',\['$scope',function($scope){ 

    $scope.brandList={'Benz':\['Regular','Truck'\]}; 
}\])] 

鏈接1

Answer 1

你可以做到這一點，

<select name="client" ng-model="selectedRequest.parentType" ng-options="c.name.en for c in clients.brandList" required></select> 
<select id="department" ng-model="selectedRequest.subType" ng-options="d.name.en for d in selectedRequest.parentType.children"> 

WORKING DEMO