Angular2更新FormArray中的表单值

Question

我需要更新 FormArray 中的 'lat' 和 'lon' 值：

initRows() {
        return this._fb.group({
            address: "",
            lat: 0,
            lon: 0,
        });
   }




 initForm() {
        this.searchForm = this._fb.group({
        addresses: this._fb.array([this.initRows()]),
    });

我需要在回调后更新它们：

 this.someService.getData().subscribe(
                  (response) => {this.data = response.json()
                                 this.lon = this.data.x;
                                 this.lat = this.data.y;
                                // UPDATE MY 'lat' and 'lon'
                  },
                  (error) => console.log('ERROR: ' + error)
          ); 

form.value 对象：

{

  "addresses": [
    {
      "address": {
        "text": "Weberweg, 58566, Kierspe, Nordrhein-Westfalen, DEU"
     },
      "lat": 0,
      "lon": 0
    },
     {
      "address": {
        "text": "Weberweg, 58566, Kierspe, Nordrhein-Westfalen, DEU"
     },
      "lat": 0,
      "lon": 0
    }
  ]
} 

附： 'lat' 和 'lon' 不是输入，只是数据

Answer 1

我不确定它是否“正确”的方式，但你可以这样做：

    /* getter for addresses.
    get addresses() {
       this.seachForm.controls.addresses as FormArray;
    }

    /* function for loading data */
    public loadData() {
        this.someService.getData().subscribe(
           (response) => {
                          this.data = response.json()
                          this.lon = this.data.x; // it is global lon like I understood
                          this.lat = this.data.y; // it is global lat like I understood
                          this.addresses.controls.forEach((address) => {
                                 address.get('lat').setValue(this.lat);
                                 address.get('lon').setValue(this.lon);
                          }),
           (error) => console.log('ERROR: ' + error)
      );
}

希望我说对了，这个答案对你有帮助。