Grouping Controls in Angular using Reactive Forms

app.component.html

<div class="container">
  <div class="row">
    <div class="col-xs-12 col-sm-10 col-md-8 col-sm-offset-1 col-md-offset-2">
      <form [formGroup]="signupForm" (ngSubmit)="onSubmit()">
        <div formGroupName="userData">
          <div class="form-group">
            <label for="username">Username</label>
            <input
              type="text"
              id="username"
              class="form-control"
              formControlName="username">
            <span
              *ngIf="!signupForm.get('userData.username').valid && signupForm.get('userData.username').touched"
              class="help-block">Please enter a valid username</span>
          </div>
          <div class="form-group">
            <label for="email">email</label>
            <input
              type="text"
              id="email"
              class="form-control"
              formControlName="email">
            <span
              *ngIf="!signupForm.get('userData.email').valid && signupForm.get('userData.email').touched"
              class="help-block">Please enter a valid email</span>
          </div>
        </div>
        <div class="radio" *ngFor="let gender of genders">
          <label>
            <input
              type="radio"
              [value]="gender"
              formControlName="gender">{{ gender }}
          </label>
        </div>
        <span
          *ngIf="!signupForm.valid && signupForm.touched"
          class="help-block">Please enter valid data</span>
        <button class="btn btn-primary" type="submit">Submit</button>
      </form>
    </div>
  </div>
</div>

app.component.ts

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

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent implements OnInit {
  genders = ['male', 'female'];
  signupForm: FormGroup;

  ngOnInit(): void {
    this.signupForm = new FormGroup({
      'userData': new FormGroup({
        'username': new FormControl(null, Validators.required),
        'email': new FormControl(null, [Validators.required, Validators.email])
      }),
      'gender': new FormControl('male') // default value for radiobutton => male
    })
    ;
  }

  onSubmit() {
    console.log(this.signupForm);
  }
}

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