Angular 反应式表单验证嵌套字段

Question

我正在使用 Angular 7

我有一个嵌套的响应式表单

this.salonProfileForm = this.fb.group({
  salonName: new FormControl('', [Validators.required]),
  address: this.fb.group({
    city: new FormControl('', [Validators.required])
  })
});

get f() {
    return this.salonProfileForm.controls;
}

我有类似的 HTML 表单

<input type="text" formControlName="salonName" required />
<ng-container *ngIf="submitted && f.salonName.invalid && (f.salonName.dirty || f.salonName.touched)">
   <small *ngIf="f.salonName.errors.required">
      Salon name is required
   </small>
</ng-container>

<div formGroupName="address">
  <input type="text" formControlName="city" />
  <ng-container *ngIf="submitted && f.city.invalid && (f.city.dirty || f.city.touched)">
    <small *ngIf="f.city.errors.required">
        city is required
    </small>
  </ng-container>
</div>

但这会导致城市输入 ng-container 字段出现错误

ERROR TypeError: Cannot read property 'invalid' of undefined

如何验证嵌套输入字段？

console.log(this.f.address)

Answer 1

你必须像下面这样访问：

f.address.controls.city.invalid

编辑

export class Home implements OnInit {
  salonProfileForm : FormGroup;

  ngOnInit() {
    this.salonProfileForm = new FormGroup({
      'salonName': new FormControl('', [Validators.required]),
      'address': new FormGroup({
        'city': new FormControl('', [Validators.required])
    })
  });
 }

}

移至.html 模板

<form [formGroup]="salonProfileForm " (ngSubmit)="onSubmit()">

<div formGroupName="address">
  <input type="text" formControlName="city" />
  <ng-container *ngIf="!salonProfileForm.get('address.city').valid && salonProfileForm.get('address.city').touched">
    <span>This is required</span>
  </ng-container>
</div>

</form>

我已经粘贴了它可以工作的形状，所以请随时更新您的代码以适应上述情况。