javascript - 使用 ng-model 和 ng-options 进行 Angular JS 级联选择

Question

所以我有点卡在连接到先前选择模型的 3rc select 上。

首先，您必须选择一个分行，然后您可以选择建筑物名称以及楼层。

vm.locations 数据

[
{
    "_id": "5a61acfdd5df1761dd2eb1ef",
    "branch": "Lucena City",
    "__v": 0,
    "building": [
        {
            "name": "mhq",
            "floors": [
                "1st",
                "2nd",
                "3rd"
            ]
        }
    ],
    "dateCreated": "2018-01-19T08:31:57.121Z"
},
{
    "_id": "5a61ad6fd5df1761dd2eb1f1",
    "branch": "Lucban",
    "__v": 0,
    "building": [
        {
            "name": "mhq",
            "floors": [
                "ground floor",
                "2nd floor",
                "3rd floor",
                "4th floor",
                "5th floor"
            ]
        }
    ],
    "dateCreated": "2018-01-19T08:33:51.761Z"
},
{
    "_id": "5a61ada1d5df1761dd2eb1f2",
    "branch": "loperz",
    "__v": 0,
    "building": [
        {
            "name": "lope",
            "floors": [
                "ground floor",
                "1st floor"
            ]
        }
    ],
    "dateCreated": "2018-01-19T08:34:41.904Z"
}]

html 端

<div class="row justify-content-md-center">
<div class="col-md-4">
    <label for="branch">
        <strong>Branch</strong>
    </label>
    <select ng-options="loc as loc.branch for loc in vm.locations" ng-model="vm.locationTest" class="form-control">
    </select>
    <small id="emailHelp" class="form-text text-muted">Select branch.</small>
</div>
<div class="col-md-4">
    <label for="building">
        <strong>Building</strong>
    </label>
    <select ng-options="ds as ds.building for ds in vm.locationTest" ng-model="vm.roomData.building" class="form-control">
    </select>
</div>
<div class="col-md-4">
    <label for="roomFloor">
        <strong>Room Floor</strong>
    </label>
    <select ng-options="ds as ds for ds in vm.locationTest.floors" ng-model="vm.roomData.roomFloor" class="form-control">
    </select>
</div>

选择一个分支有效，之后我无法将数据传递到第二个和第三个select。我不太擅长处理对象数据。

Answer 1

看起来您这里有一个拼写错误:

<select ng-options="ds as ds.building for ds in vm.locationTest" ng-model="vm.roomData.building" class="form-control">
</select>

具体而言，vm.locationTest 应为 vm.locationTest.building，ds.building 应为 ds.name

所以它会是:

<select ng-options="ds as ds.name for ds in vm.locationTest.building" ng-model="vm.roomData.building" class="form-control">
</select>

然后，我们还需要修复第三个 ng-options:

vm.locationTest.floors 变为 vm.roomData.building.floors