2009/3/12 Stephan Richter <[email protected]>: > 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. :-)
Just to note, there's already the NOT_CHANGED constant in z3c.form.interfaces. -- WBR, Dan Korostelev _______________________________________________ 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 )
