javascript - formArrayName 必须与父 formGroup 指令一起使用

Question

我收到一个错误:formArrayName 必须与父 formGroup 指令一起使用。您需要添加一个 formGroup 指令并将现有的 FormGroup 实例传递给它。我不确定我做错了什么。 我希望 FormGroup 迭代几次(使用 ngFor)，并认为使用 formArrayName 将是答案。

HTML:

<div formArrayName = "PaymentArray" *ngFor = "let meshalem of paymentForm.get('PaymentArray').controls;let i =index;">
    <div [formGroup]="i">
        <div class="row box-border" >
            <div class="form-group col-xs-12 col-sm-12 col-md-5 pull-right required">
                <label class="control-label">מספר ת.ז. משלם</label>
                <input #PidField name="id_pay" id="id_pay" formControlName="id_pay" class="form-control input-lg"
                    maxlength="9" (input)="searchChange($event.target.value)" />
            </div>
        </div>
    </div>
</div>

.ts File:

  paymentForm = this.fb.group({
    PaymentArray: this.fb.array([])
  })
  
  
  
  getPaymentList()
  {
   
        this._adminService.getPayment(this.id).subscribe(res => {
            if(res.isSuccess)
            {
                this.PaymentList = res.data ;
                this.PaymentList.forEach((pays) => {
                        this.meshalemArray = this.paymentForm.get('PaymentArray') as FormArray;
                        this.meshalemArray.push(this.fb.group({
                            id_pay:[pays.id_pay,Validators.compose([Validators.pattern("^[0-9]*$"), Validators.required])],
                            numberRooms:[pays.numberRooms],
                            sum: [pays.sum],
                            paymentMethod:[pays.paymentMethod],
                            credit:[pays.credit],
                        }))  
                        
                })
            }
            else
            {
              //TODO
            }
        })
    
  }

Answer 1

错误是因为你没有使用 FormArray里面FormGroup .只需包装 FormArray在FormGroup里面:-

<form [formGroup]="paymentForm">
  <div formArrayName = "PaymentArray" *ngFor = "let meshalem of paymentForm.get('PaymentArray').controls;let i =index;">
    <div [formGroup]="i">
      <div class="row box-border" >
        <div class="form-group col-xs-12 col-sm-12 col-md-5 pull-right required">
          <label class="control-label">מספר ת.ז. משלם</label>
          <input #PidField name="id_pay" id="id_pay" formControlName="id_pay" class="form-control input-lg"
                 maxlength="9" (input)="searchChange($event.target.value)" />
        </div>
      </div>
    </div>
  </div>
</form>

我认为 <div [formGroup]="i">应该是 <div [formGroupName]="i">或 <div [formGroup]="meshalem">