On Thu, Aug 28, 2008 at 05:26:20PM +0200, Hermann Himmelbauer wrote: > Am Donnerstag 28 August 2008 10:14:11 schrieb Martin Aspeli: > > What about the case when you have a list of options of which you need to > > chose one or more? In that case, ticking none is a validation error. > > Yes, in your case this should give a validation error. However, the case > where > someone uses a checkbox for a True/False operation is at least as common. And > if "no ticking" gives a validation error, this would prevent using checkboxes > for this case. Moreover, a checkbox is typically used to represent a "Bool" > schema (by default it's a choice widget, I think), so that fits well, I > think. > > My suggestion would be to: > > - Create some schema field, e.g. "MultipleChoice": > > colors = MutlipleChoice(title='Colors', values=['red', 'green', 'blue'], > default=['green', 'blue'], required=True)
colors = Set(type=u"Choose your favourite colors",
value_type=Choice(values=['red', 'green', 'blue']),
min_length=1)
> - Register a widget for this field, which is then rendered as a bunch of
> checkboxes.
I think there is a multi-selection widget based on checkboxes, that
works on Sets of Choices. It's not the default widget (the default is a
multi-selection list box), and while it is registered as being valid for
sets, it always tries to store a list in the content object.
I'm writing from memory, so I may have gotten some details wrong.
Marius Gedminas
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