missing validation error message

[to-do42]

Describe the bug

If I bind a TwinColGrid to a vaadin binder and declare its value as required, then no message is shown if the constraint is not fulfilled. The required indicator is visible, but no message occured if the validation failed.

Also, with a custom validator, no error message is shown:

    .withValidator(new Validator<>() {
        @Override
        public ValidationResult apply(List<TwinGridDto> twinGridDtos, ValueContext valueContext) {
            if (CollectionUtils.isEmpty(twinGridDtos)) {
                return ValidationResult.error("data is required");
            } else if (numberOfDistinctGewerke(twinGridDtos) > 1) {
                return ValidationResult.error("more than one Gewerk not allowed");
            } else {
                return ValidationResult.ok();
            }
        }
    })

Expected behavior

The message set via asRequired("message") should be shown.

Minimal reproducible example

TwinColGrid<TwinGridDto> grid = new TwinColGrid<>(availableData)
    .withAvailableGridCaption("Verfügbare Leistungstexte")
    .withSelectionGridCaption("Zum JUMBO hinzugefügt")
    .withoutAddAllButton()
    .withSizeFull()
    .selectRowOnClick();

// grid.addFilterableColumn(...);

this.binder.forField(grid.asList())
    .asRequired("should not empty")
    .bind(JumboDialogDto::getLeistungstextJumbos, JumboDialogDto::setLeistungstextJumbos);

Add-on Version

3.0.0

Vaadin Version

24.7.6

[javier-godoy]

Hello. TwinColGrid supports setRequiredIndicatorVisible from HasValue, but it does not implement HasValidation, so it does not support displaying error messages.

[to-do42]

any chance to add that ?

[javier-godoy]

@to-do42

any chance to add that ?

Yes, we will investigate how to add it to the component.