<span *ngIf="registrationForm.controls.firstName.errors && registrationForm.controls.firstName.errors.required && registrationForm.controls.firstName.touched" class="clr-subtext">This field is required</span><span *ngIf="registrationForm.controls.email.errors && registrationForm.controls.email.errors.required && registrationForm.controls.email.touched" class="clr-subtext">This field is required</span>isFieldRequired(field: string): boolean {
const control = this.registrationForm.controls[field];
return control.errors && control.errors.required && control.touched;
}