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angular / 7 / api / forms / ngmodelgroup.html

NgModelGroup

directive

Creates and binds a FormGroup instance to a DOM element.

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NgModule

Selectors

Properties

Property Description
@Input('ngModelGroup')name: string

Tracks the name of the NgModelGroup bound to the directive. The name corresponds to a key in the parent NgForm.

Inherited from AbstractFormGroupDirective

Inherited from ControlContainer

Inherited from AbstractControlDirective

Template variable references

Identifier Usage
ngModelGroup #myTemplateVar="ngModelGroup"

Description

This directive can only be used as a child of NgForm (within <form> tags).

Use this directive to validate a sub-group of your form separately from the rest of your form, or if some values in your domain model make more sense to consume together in a nested object.

Provide a name for the sub-group and it will become the key for the sub-group in the form's full value. If you need direct access, export the directive into a local template variable using ngModelGroup (ex: #myGroup="ngModelGroup").

Consuming controls in a grouping

The following example shows you how to combine controls together in a sub-group of the form.

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

@Component({
  selector: 'example-app',
  template: `
    <form #f="ngForm" (ngSubmit)="onSubmit(f)">
      <p *ngIf="nameCtrl.invalid">Name is invalid.</p>
    
      <div ngModelGroup="name" #nameCtrl="ngModelGroup">
        <input name="first" [ngModel]="name.first" minlength="2">
        <input name="last" [ngModel]="name.last" required>
      </div>
      
      <input name="email" ngModel> 
      <button>Submit</button>
    </form>
    
    <button (click)="setValue()">Set value</button>
  `,
})
export class NgModelGroupComp {
  name = {first: 'Nancy', last: 'Drew'};

  onSubmit(f: NgForm) {
    console.log(f.value);  // {name: {first: 'Nancy', last: 'Drew'}, email: ''}
    console.log(f.valid);  // true
  }

  setValue() { this.name = {first: 'Bess', last: 'Marvin'}; }
}

Inherited from AbstractFormGroupDirective

Inherited from AbstractControlDirective

© 2010–2019 Google, Inc.
Licensed under the Creative Commons Attribution License 4.0.
https://v7.angular.io/api/forms/NgModelGroup