onValidate method

  1. @override
String? onValidate(
  1. PhoneNumber? value,
  2. String validationMessage
)
override

onValidate is used to validate the given input by the user.

Implementation

@override
String? onValidate(
  input.PhoneNumber? value,
  String validationMessage,
) {
  if (mandatory) {
    if (value == null || value.number == null) {
      return validationMessage;
    }
  }

  return null;
}