[英]How can I read and bind data from this JSON to a Select dropdown in Angular 2+
这是我的JSON的样子:
{
"Stations": {
"44": {
"NAME": "Station 1",
"BRANCH_CD": "3",
"BRANCH": "Bay Branch"
},
"137": {
"NAME": "Station 2",
"BRANCH_CD": "5",
"BRANCH": "Beach Branch"
}
}
}
我想知道是否有可能从每个“站”中提取“名称”和“分支”值并将它们绑定到单独的选择输入[下拉列表]
我正在使用Angular4。这是我所拥有的:
this.apiService.getStations().subscribe(data => {
this.stationList = data.Stations;
}, err => {
this.errorFetchingStations = err;
console.log("Error getting list of stations " + err);
})
this.stationList
在控制台中给了我这种格式的对象:
{44:{NAME: "Name of station", BRANCH: "Name of branch"}}
{137:{NAME: "Name of station", BRANCH: "Name of branch"}}
等等。
如果我尝试像这样将stationList绑定到我的选择,则会出现错误
错误错误:尝试与'[object Object]'进行比较时出错。 仅允许数组和可迭代
<select class="form-control">
<option *ngFor="let station of stationList" [value]="station.NAME">{{station.NAME}}</option>
</select>
您具有对象的键值对,而不是ngFor需要一个数组,因此应使用以下代码
this.apiService.getStations().subscribe(data => {
this.stationList = Object.values(data.Stations); // returns an array
}, err => {
this.errorFetchingStations = err;
console.log("Error getting list of stations " + err);
})
您应该将stationList转换为数组,然后可以使用Object.values(data.Stations),如下所示。
this.apiService.getStations().subscribe(data => {
var stations = data.Stations;
this.stationList = Object.values(stations);
}, err => {
this.errorFetchingStations = err;
console.log("Error getting list of stations " + err);
})
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