Validation

Required

loginForm = new FormGroup({
    formEmail: new FormControl('', Validators.required),
    formPassword: new FormControl('', Validators.required),
  });

<div
  *ngIf="loginForm.controls['formEmail'].errors?.['required'] && 
  loginForm.controls['formEmail'].touched"
  class="text-danger"
>
  Email field is required.
</div>