validateValue method

  1. @override
String? validateValue(
  1. T? valueCandidate
)
override

Validates the value. Returns null if the value is valid, otherwise an error message. Call validate() instead of this method when using the validator.

Implementation

@override
String? validateValue(T? valueCandidate) {
  String? errorResult;
  for (final FormFieldValidator<T> validator in validators) {
    final String? validatorResult = validator.call(valueCandidate);
    if (validatorResult == null) {
      return null;
    } else {
      errorResult = validatorResult;
    }
  }
  return errorResult;
}