[formArrayName] directive

Syncs a nested FormArray to a DOM element.

This directive is designed to be used with a parent FormGroupDirective (selector: [formGroup]).

It accepts the string name of the nested FormArray you want to link, and will look for a FormArray registered with that name in the parent FormGroup instance you passed into FormGroupDirective.

import {Component} from '@angular/core';
import {FormArray, FormControl, FormGroup} from '@angular/forms';

@Component({
  selector: 'example-app',
  template: `
    <form [formGroup]="form" (ngSubmit)="onSubmit()">
      <div formArrayName="cities">
        <div *ngFor="let city of cities.controls; index as i">
          <input [formControlName]="i" placeholder="City">
        </div>
      </div>
      <button>Submit</button>
    </form>

    <button (click)="addCity()">Add City</button>
    <button (click)="setPreset()">Set preset</button>
  `,
})
export class NestedFormArray {
  form = new FormGroup({
    cities: new FormArray([
      new FormControl('SF'),
      new FormControl('NY'),
    ]),
  });

  get cities(): FormArray { return this.form.get('cities') as FormArray; }

  addCity() { this.cities.push(new FormControl()); }

  onSubmit() {
    console.log(this.cities.value);  // ['SF', 'NY']
    console.log(this.form.value);    // { cities: ['SF', 'NY'] }
  }

  setPreset() { this.cities.patchValue(['LA', 'MTV']); }
}

Interface, extends ControlContainer

name#

@Input('formArrayName') name: string | number | null

Tracks the name of the FormArray bound to the directive. The name corresponds to a key in the parent FormGroup or FormArray. Accepts a name as a string or a number. The name in the form of a string is useful for individual forms, while the numerical form allows for form arrays to be bound to indices when iterating over arrays in a FormArray.

control#

get control(): FormArray

The FormArray bound to this directive.

formDirective#

get formDirective(): FormGroupDirective|null

The top-level directive for this group if present, otherwise null.

path#

get path(): string[]

Returns an array that represents the path from the top-level form to this control. Each index is the string name of the control on that level.

validator#

get validator(): ValidatorFn|null

Synchronous validator function composed of all the synchronous validators registered with this directive.

asyncValidator#

get asyncValidator(): AsyncValidatorFn|null

Async validator function composed of all the async validators registered with this directive.