validator property

String? Function(T? value)? get validator

validator A function that validates the input value.

By default, this returns null, indicating that there is no validation.

Example:

@override
String? Function(MyEnum? value)? get validator => (value) {
  if (value == null) {
    return 'Please select an option';
  }
  return null; // Valid input
};

Implementation

String? Function(T? value)? get validator => null;