formArrayName必须与父formGroup指令一起使用

Question

I'm getting an error: formArrayName must be used with a parent formGroup directive. You'll want to add a formGroup directive and pass it an existing FormGroup instance formArrayName must be used with a parent formGroup directive. You'll want to add a formGroup directive and pass it an existing FormGroup instance . I'm not sure what am I doing wrong. I would like the FormGroup to iterate several time(using ngFor ), and thought using formArrayName would be the answer.

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

Error is causing because you are not using FormArray inside FormGroup . Just wrap the FormArray inside the FormGroup :-

<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>

And I think <div [formGroup]="i"> should be eigther <div [formGroupName]="i"> or <div [formGroup]="meshalem">