On Thursday 12 March 2009, Martin Aspeli wrote: > I'm writing a custom file widget for z3c.form that works like the > Archetypes file widget that Plone uses and the formlib widget in > collective.namedfile. That is, after you've uploaded a file once, you're > given a radio button to decide whether to upload a new file, or leave > the existing file in place. > > I can't quite figure out how to do this, though. I've tried to override > the extract() method on the widget to look in the request for the > special marker that says "user chose not to change the file". However, I > don't know what to return. If I return NOVALUE, then validation fails > (if the field is required). If I try to look up the field value from the > data manager and return it, it ends up setting the field back on itself, > which is wasteful.
All great questions and I am not sure I have good answers. I think you want a "NONEWVALUE" or so marker and have the validator honor it correctly. If you make a proposal to enrich the API, I'll probably agree to it. :-) Regards, Stephan -- Stephan Richter Web Software Design, Development and Training Google me. "Zope Stephan Richter" _______________________________________________ Zope-Dev maillist - [email protected] http://mail.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope )
