tryValidate method

@override String? tryValidate()

Validates the form field value

Implementation

@override
String? tryValidate() {
  assert(extra.isNotEmpty, "Values to check from is required");
  final extraToList = extra.split(",");
  if (!extraToList.contains(value)) {
    if (customMessage == null) {
      return buildMessage(ValidatorStrings.inRes, attribute, extra);
    }
    return customMessage;
  }
  return null;
}