onValidateField method

@override String? onValidateField(dynamic text)

Validates the input field for the dropdown based on its current state.

Returns the current validation error if any, otherwise returns null.

• text: The text to validate.

Implementation

@override
String? onValidateField(text) {
  if (multiSelectValidator != null) {
    setValidationError = multiSelectValidator!(selectedValues);
  }
  notifyListeners();
  return super.onValidateField(text);
}