[Zope-dev] zope.app.form: Make "no value" always available?

[Philipp von Weitershausen]

Thomas Lotze wrote:
> zope.app.form items edit widgets don't provide the "no value" value if
> the corresponding field is required. While this prevents invalid input, it
> means that e.g. a drop-down box may then have one of the valid values
> pre-selected. If user forgets to change that value, he could save the form
> without noticing that the default value is implicitly selected, which may
> be completely wrong.
> 
> In some cases it would be preferrable for the widget to default to a "no
> value" value even if the field is required so the form won't validate if
> the user doesn't consciously select a value. One of our customers asked
> for this behaviour, for example. If noone objects, we'd like to change
> zope.app.form accordingly.

+1, but perhaps for required fields we shouldn't say "(no value)", we 
should say "(select a value)".