Am Donnerstag 28 August 2008 02:35:28 schrieb Marius Gedminas:
> On Wed, Aug 27, 2008 at 05:15:48PM -0700, Stephan Richter wrote:
> > On Wednesday 27 August 2008, Martin Aspeli wrote:
> > > This means that if the request contains the empty-marker only (no
> > > selection was made) for a checkbox widget (say), then the return value
> > > is [], rather than default (NOVALUE).
> > >
> > > Is that a bug? I have a custom checkbox widget derived from the
> > > standard checkbox widget, (z3c.formwidget.query, in fact), and I never
> > > get any "required missing" exceptions, even when I untick all the
> > > checkboxes and click OK.
> > >
> > > Am I missing something?
> >
> > I think you have a point. Have you tried changing the behavior to
> > return "default" and see what tests fail? If no major failures come out
> > of this, I would say change it.
>
> Wait a second, maybe I'm misunderstanding this, but I certainly oppose
> any change that would make an unchecked checkbox an error during form
> validation.
>
> A required Bool field can have two values: True or False.  One is
> represented by a checked checkbox, the other by an unchecked checkbox.
> An unchecked checkbox is not missing input and should not trigger
> "required missing" errors.

I see this the same way - in my application I have a similar case (Accept some 
policy by a checkbox-click). I solved this simply by checking the value in 
the action handler and raising a WidgetExecutionError if it is unchecked.

Best Regards,
Hermann

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