Angular2:在FormArray的索引1处找不到表单控件

Question

在运行时,我从JSON对象获取所有记录,并在表单控件中获取值.但是,在表单数组中,我只获得了许多记录中的第一个.

控制台中显示的错误:

在FormArray._throwIfControlMissing中找不到索引1处的表单控件

JSON对象和错误的图像:

1. 接口

export interface IService {
    ServiceID: number,
    Name: string,
    Staffs: IStaffView[]
}

export interface IStaffView {
    StaffServiceID: number,
    StaffID: number,
    Name: string
}

2. 零件

import { Component, OnInit, Input } from '@angular/core';
import { ActivatedRoute } from '@angular/router';
import { Location } from '@angular/common';
import { Observable } from 'rxjs/Rx';
import { FormBuilder, FormGroup, FormControl, FormArray , Validators } from '@angular/forms';

import { RESTService } from '../../Service/REST.service';
import { IService, IStaffView } from '../../Model/service.model';
import { DBOperation } from '../../Shared/enum';
import { Global } from '../../Shared/global';

@Component({
    selector: 'app-service-detail',
    templateUrl: 'app/Components/service-detail/service-detail.component.html'
})

export class ServiceDetailComponent implements OnInit {
   
    service: IService;
    services: IService[];
    staffview: IStaffView;
    staffsview: IStaffView[];

    serviceFrm: FormGroup;
    Staffs: FormArray;

    msg: string;
    indLoading: boolean = false;
    btnTitle: string;
    dbops: DBOperation;

    constructor(
        private fb: FormBuilder,
        private _restService: RESTService,
        private location: Location,
        private _route: ActivatedRoute
    ) {
        const id = this._route.snapshot.params['id'];
        if (!id || id == 0) {
            this.btnTitle = 'Save';
            this.dbops = DBOperation.create;
        } else {
            this.btnTitle = 'Edit';
            this.dbops = DBOperation.update
        }
    }

    ngOnInit(): void {
        //this.Staffs = this.fb.array([
        //    this.initStaff()
        //]);


        this.serviceFrm = this.fb.group({
            ServiceID: [''],
            Name: ['', Validators.required],
            Staffs: this.fb.array([
                this.initStaff()
            ])
        });

        this.getService();
    }

    initStaff() {
        return this.fb.group({
            StaffServiceID: [''],
            StaffID: [''],
            Name: ['']
        });
    }

    getService(): void {
        const id = parseInt(this._route.snapshot.params['id']);
        if (id && id > 0) {
            this.indLoading = true;
            this._restService.getById('/api/serviceapi/', id)
                .subscribe(resp => this.serviceFrm.setValue(resp)
                , error => this.msg = <any>error);
        }
    }

}

3. HTML代码

  <div class="row form-group">
                    <div class="col-md-3">
                        <label for="message-text" class="control-label">Staffs</label>
                    </div>
                    <div formArrayName="Staffs">
                        <div *ngFor="let staff of serviceFrm.controls.Staffs.controls; let i=index" formGroupName="{{i}}">
                            <div>
                                <label>Name</label>
                                <input type="text" class="form-control" formControlName="Name">
                            </div>
                        </div>
                    </div>
                </div>

Answer 1

提到的错误是由调用this.serviceFrm.setValue(resp)(https://github.com/angular/angular/blob/master/packages/forms/src/model.ts#L1382)引起的.

此方法执行严格检查,因此如果您尝试设置不存在的控件的值或者排除控件的值,则会抛出错误.

您正在尝试将3个项目(根据您的快照)分配给FormArray,在索引0处只有一个初始FormGroup,因此在索引1处分配值失败,因为它不存在.

要解决它在修补值之前清空表单数组,请使用patchValue()(接受部分值)而不是setValue()然后在循环中推送每个值:

getService(): void {
  const id = parseInt(this._route.snapshot.params['id']);
  if (id && id > 0) {
    this.indLoading = true;
    this._restService.getById('/api/serviceapi/, id).subscribe(
      resp => {
        // get form array reference
        const staffs = this.serviceFrm.get('Staffs') as FormArray;
        // empty form array
        while (staffs.length) {
          staffs.removeAt(0);
        }
        // use patchValue instead of setValue
        this.serviceFrm.patchValue(resp);
        // add form array values in a loop
        resp.Staffs.forEach(staff => staffs.push(this.fb.group(staff));
      }, 
      error => this.msg = <any>error
    );
  }
}