onValidate method

@override Future<FormsFieldException?> onValidate(T value)

Implementation

@override
Future<FormsFieldException?> onValidate(T value) async {
  if (value == null ||
      value == false ||
      value is Iterable && value.isEmpty ||
      value is String && value.isEmpty ||
      value is Map && value.isEmpty) {
    return const FormsFieldRequiredException();
  }

  return null;
}