[Zope3-dev] Re: Missing widget data and error handling

[Garrett Smith]

Marius Gedminas wrote:
> Hi, form experts!
> 
> I've just discovered what I think is a small bug in the form machinery
> (zope.app.form.utility.getWidgetsData, to be precise).

> Some input widgets do not.  One particular
> instance is RadioWidget -- if none of the radio buttons is selected, the
> browser will not send that input field when submitting the form.  As a
> result, a rendered RadioWidget never displays the error message saying
> that required input is missing.

This sounds like a bug in the radio button widget -- it needs to 
implement hasInput without relying on form input submitted from input 
elements of type 'radio'. This problem comes up with checkbox widgets as 
well.

I briefly glanced at the itemswidget.py module (I assume this is the 
code you're referring to) and it does use an 'empty' marker, but may not 
be doing so correctly.

Feel free to add this as a collector issue. If the original authors 
don't have the time to look into this, I can take a more in depth look.

  -- Garrett