帶有驗證的ngForm和角度為6的子組件

Question

我有一張表格

    <form #basic="ngForm">
  <div>
    <label>Firstname:</label>
    <input type="text" name="firstName" ngModel required>
  </div>
  <div>
    <label>Lastname:</label>
    <input type="text" name="lastName" ngModel>
  </div>
  <address ></address>
</form>

並且在那種形式中有一個子組件<address> ，我想要對父組件和子組件進行驗證。 我想用ngForm來做，我知道如何使用formgroups，通過將表單變量傳遞給子組件，但我也嘗試了但是它給我一個錯誤

子組件

import { Component, Input } from '@angular/core';


@Component({
  selector: 'address',
  template: `

      <div>
        <label>Zip:</label>
        <input [ngClass]="{error: (basic.submitted)}" type="text" name="zip" ngModel>
      </div>
      <div>
        <label>Street:</label>
        <input type="text" name="street" ngModel required>
      </div>
      <div>
        <label>City:</label>
        <input type="text" name="city" ngModel>
      </div>

  `,

})
export class AddressComponent  {

}

Answer 1

您需要將表單變量傳遞給子組件，如下所示

<form #basic="ngForm">
  <div>
    <label>Firstname:</label>
    <input type="text" name="firstName" ngModel required>
  </div>
  <div>
    <label>Lastname:</label>
    <input type="text" name="lastName" ngModel>
  </div>
  <address [basic]="basic"></address>
</form>

處理該變量並在子組件中導入ControlContainer和NgForm

import { Component, Input } from '@angular/core';
import { ControlContainer, NgForm } from '@angular/forms';

@Component({
  selector: 'address',
  template: `

      <div>
        <label>Zip:</label>
        <input [ngClass]="{error: (basic.submitted)}" type="text" name="zip" ngModel>
      </div>
      <div>
        <label>Street:</label>
        <input type="text" name="street" ngModel required>
      </div>
      <div>
        <label>City:</label>
        <input type="text" name="city" ngModel>
      </div>

  `,
  viewProviders: [ { provide: ControlContainer, useExisting: NgForm } ]
})
export class AddressComponent  {
  @Input() basic;
}

現在它將處理組件父級和子級的驗證。

stackblitz.com/edit/angular-uee6gk