Function for tapping on angular inputs

touchInputs.ts

  static touchInputs(form: FormGroup): void {
    if (!form) {
      return;
    }
    Object.keys(form.controls).forEach((key) => {
      if (form.controls[key] instanceof FormGroup) {
        this.touchInputs(form.controls[key] as FormGroup);
      }
      if (form.controls[key] instanceof FormArray) {
        if (form.controls[key]["controls"].length) {
          (form.controls[key] as any).controls.forEach((r) => this.touchInputs(r as FormGroup));
        }
      }
      form.controls[key].markAsTouched();
    });
  }