在ngModelGroup更新时更新ngForm控件

<form #myForm="ngForm">
  <div ngModelGroup="myGroup" (ngModelGroupChange)="onGroupChange($event)">
    <input type="text" name="name" [(ngModel)]="myGroup.name">
    <input type="email" name="email" [(ngModel)]="myGroup.email">
  </div>
</form>

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

@Component({
  selector: 'my-app',
  template: `
    <form #myForm="ngForm">
      <div ngModelGroup="myGroup" (ngModelGroupChange)="onGroupChange($event)">
        <input type="text" name="name" [(ngModel)]="myGroup.name">
        <input type="email" name="email" [(ngModel)]="myGroup.email">
      </div>
    </form>
  `
})
export class AppComponent {
  myGroup = {
    name: '',
    email: ''
  };

  onGroupChange(newValue: any) {
    // 更新ngForm控件的值
    this.myForm.setValue({
      myGroup: newValue
    });

    // 标记ngForm控件为已修改
    this.myForm.markAsDirty();

    // 更新ngForm控件的验证状态
    this.myForm.updateValueAndValidity();
  }
}