Angular forms FormGroupName Directive

In this article, we are going to see what is FormGroupName in Angular 10 and how to use it. The FormGroupName is used to sync a nested FormGroup to a DOM element.

Syntax:

<form [FormGroupName] ="details">

Exported from:

• ReactiveFormsModule

Selectors:

• [FormGroupName]

Approach: 

• Create the Angular app to be used
• In app.component.ts make an object that contain value for the input.
• In app.component.html use FormGroupName to get values.
• Serve the angular app using ng serve to see the output.

Example:

app.component.ts

import { Component, Inject } from '@angular/core';
  import { FormGroup, FormControl, FormArray } from '@angular/forms'
  @Component({
    selector: 'app-root',
    templateUrl: './app.component.html',
    styleUrls: [ './app.component.css' ]
  })
  export class AppComponent  {
    form = new FormGroup({
      details: new FormGroup({
        name: new FormControl(),
        email: new FormControl()
      })
    });

    get name(): any {
      return this.form.get('details.name');
    }
    get email(): any {
      return this.form.get('details.email');
    }

    onSubmit(): void {
      console.log(this.form.value);
    }

  }

app.module.ts

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

// Importing forms module
import { FormsModule, ReactiveFormsModule  } from '@angular/forms';
import { BrowserModule } from '@angular/platform-browser';
import { BrowserAnimationsModule }
    from '@angular/platform-browser/animations';

import { AppComponent }   from './app.component';

@NgModule({
  bootstrap: [
    AppComponent
  ],
  declarations: [
    AppComponent
  ],
  imports: [
    FormsModule,
    BrowserModule,
    BrowserAnimationsModule,
    ReactiveFormsModule

  ]
})
export class AppModule { }

app.component.html

<br>
<form [formGroup]="form" (ngSubmit)="onSubmit()">
  <div formGroupName="details">
    <input formControlName="name" placeholder="Name">
    <input formControlName="email" placeholder="Email">
  </div>
  <br>

  <button type='submit'>Submit</button>
  <br><br>
</form>

Output:

Reference: https://angular.io/api/forms/FormGroupName