http://wicket.apache.org/docs/1.4/org/apache/wicket/markup/html/form/AbstractSingleSelectChoice.html#setNullValid%28boolean%29
Kind regards,
Stijn
2010/1/8 Norman Elton <normel...@gmail.com>
> I'm using a DropDownChoice to select one of a number of items loaded
> from my DAO:
>
> DropDownChoice<AuditTrain> train_drop_down = new
> DropDownChoice<AuditTrain>("new-train", new_audit_train, new
> DetachableAuditTrainsModel(this.train_dao.getList()));
>
> This works fine. But my the property I'm setting is nullable; that is,
> it accepts NULL values. So I'd like to add an item to the beginning of
> the list entitled "No Audit Train". I've tried a few ways, but all
> seem to get dirtier and kludgier the farther down the rabbit hole I
> dig. For instance, I've tried modifying my DAO to prepend the list
> with NULL, then use a custom ChoiceRenderer to catch this and format
> it properly. But then my DetachableLoadable model needs to be able to
> catch and reload this NULL value. Things get out of hand quickly.
>
> Is there a standard way to solve this problem?
>
> Thanks,
>
> Norman
>
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