抽象控制，具有外部Angular 7的价值

Question

当我在Angular材料上打开对话框时，我将一些数据发送到对话框

所以在对话框组件上我为检查值创建自定义验证是否结束或较低，但我一直遇到错误，认为该属性是未定义的

这是我的代码

  constructor(@Inject(MAT_DIALOG_DATA) public data: VendorDataMaster,
  private fb: FormBuilder,
  public usd: UserdetailsService ) { }
this.validateFormVendor = this.fb.group({
      InvoiceAmountcontrol: [ this.data.InvoiceAmount , [ Validators.required, this.ToleranceValidator] ],
      NoInvoicecontrol: [ this.data.NoInvoice, [ Validators.required ] ],
      DateInvoicecontrol: [ this.data.DateInvoice, [ Validators.required ] ],
      NoFakturPajakcontrol: [ this.data.NoFakturPajak, [ Validators.required ] ],
      DateFakturPajakcontrol: [ this.data.DateFakturPajak, [ Validators.required ] ],
      Statuscontrol : [ {value:this.data.StatusInv, disabled: true} ]
    });
  }
  ToleranceValidator(control: AbstractControl) {
// this is when the data is undifiend
      console.log(this.data.AmountGR)
      if (parseInt(control.value) >  parseInt(this.data.AmountGR) * 1) {
        return { ToleranceRange : true };
      }
      return null;
  }
  public hasError = (controlName: string, errorName: string) =>{
    return this.validateFormVendor.controls[controlName].hasError(errorName);
  }

我猜NGIF的启动速度比Constractor快，但我不知道会发生什么

ive尝试使用尝试捕获，但没有解决问题，而且我也将结果放在导出的组件上，以便我可以在对话框组件上使用它，但仍然不确定

Answer 1

将ToleranceValidator设置为async验证器，如下所示。而不是将其添加到数组的第二个值中，而是将其添加为第三位。

this.validateFormVendor = this.fb.group({
      InvoiceAmountcontrol: [ this.data.InvoiceAmount , [ Validators.required], this.ToleranceValidator ],
      NoInvoicecontrol: [ this.data.NoInvoice, [ Validators.required ] ],
      DateInvoicecontrol: [ this.data.DateInvoice, [ Validators.required ] ],
      NoFakturPajakcontrol: [ this.data.NoFakturPajak, [ Validators.required ] ],
      DateFakturPajakcontrol: [ this.data.DateFakturPajak, [ Validators.required ] ],
      Statuscontrol : [ {value:this.data.StatusInv, disabled: true} ]
    });
  }

Answer 2

使用bind

this.validateFormVendor = this.fb.group({
      InvoiceAmountcontrol: [ '' , [ Validators.required, this.ToleranceValidator.bind(this)] ],
      NoInvoicecontrol: ['', [ Validators.required ] ],
      DateInvoicecontrol: [ '', [ Validators.required ] ],
      NoFakturPajakcontrol: [ '', [ Validators.required ] ],
      DateFakturPajakcontrol: [ '', [ Validators.required ] ],
      Statuscontrol : [ {value:'', disabled: true} ]
    });
  }