使用AngularJS使用對象數組填充和過濾下拉列表

Question

我有來自API的以下數據結構。

$scope.cityList = [{
"_id": {
    "$oid": "584ebd7f734d1d55b6dd4e5e"
},
"cityName": "New York",
"region": "north",
"people": [
    { "id": 1, "name": "x" },
    { "id": 2, "name": "y" },
    { "id": 3, "name": "z" },
    { "id": 4, "name": "a" },
    { "id": 5, "name": "b" },
    { "id": 6, "name": "c" }
]
},
{
"_id": {
    "$oid": "584ebd7f734d1d55b6dd4e5e"
},
"cityName": "New Jersey",
"region": "South",
"people": [
    { "id": 1, "name": "x" },
    { "id": 2, "name": "y" },
    { "id": 3, "name": "z" },
    { "id": 4, "name": "a" },
    { "id": 5, "name": "b" },
    { "id": 6, "name": "c" }
]
}]

我正在嘗試設置兩個下拉菜單：

• 第一個顯示cityNames列表
• 第二個顯示所選城市中所有人names的列表。

我還想將所選用戶名的id保存到變量中。

---

到目前為止我試過這個：

<select ng-model="city">
    <option ng-repeat="city in cityList" value="{{city.cityName}}">{{city.cityName}}</option>
</select>

<select ng-model="selectedItem">
    <optgroup ng-repeat="option in cityList | filter: city">
        <option ng-repeat="x in option.people">{{x}}</option>
</select>

Answer 1

你應該使用ng-options ：

<select ng-model="selectedCity" 
        ng-options="c as c.cityName for c in cityList">
</select>

<select ng-model="selectedPerson" 
        ng-options="p as p.name for p in selectedCity.people">
</select>

演示JSFiddle。