Hi Charlie I have done something similiar with formish.
I extended the formish schema (structure) to take a context on instantiation, and then apply (create any custom widgets validators) just before rendering in the form handler. You can see an early approach at http://code.google.com/p/bfg-pages/source/browse/trunk/pages/schema.py#84 for the schema and form handler at http://code.google.com/p/bfg-pages/source/browse/trunk/pages/views.py#106 Cheers Tim On Tue, Sep 7, 2010 at 9:09 PM, Charlie Clark <charlie.cl...@clark-consulting.eu> wrote: > Am 07.09.2010, 06:56 Uhr, schrieb Tim Hoffman <zutes...@gmail.com>: > >> So in my contrived example I would like the set of possible values >> for color is dependent on the >> user and some other factor. Looking at the code for SelectWidget and >> RadioChoice widget >> it appears they won't take a callable and lazily render those values >> at render time. > > Tim, > > do you mean in a similar way to the way a vocabulary works in zope.schema? > I discussed this a while back with Chris and the reason why this often > extremely useful feature isn't built into deform is that deform on its own > has no context. I have written something similar - a callable that works > both as a validator for Schema nodes and as values for widgets: > > > class Source(object): > """Utility for vocabulary constraints""" > > def __init__(self, values): > """Can be initialised from a dictionary, a list of tuples > or a list""" > if hasattr(values, 'items'): > self.values = values.items() > elif hasattr(values, 'append'): > try: > dict(values) > self.values = values > except ValueError: > self.values = enumerate(values) > > def __call__(self, value): > return value in self.values > > def __iter__(self): > return self.values.__iter__() > > > colours = Source( > ['red, blue, green'] > ) > > > class MySchema(MappingSchema): > > > colour = SchemaNode( > String(), > title=u'Travel details', > validator=colours) > > class Form(object): > > def __init__(self, context, request): > self.context = context > self.request = request > > form = Form(MySchema(), buttons=(u'submit',)) > form['lift'].widget = widget.RadioChoiceWidget(values=colours) > > def __call__(self): > html = self.form.render() > return {'form':html} > > I don't know how much of this could be truly dynamic. > > Charlie > -- > Charlie Clark > Managing Director > Clark Consulting & Research > German Office > Helmholtzstr. 20 > Düsseldorf > D- 40215 > Tel: +49-211-600-3657 > Mobile: +49-178-782-6226 > _______________________________________________ > Repoze-dev mailing list > Repoze-dev@lists.repoze.org > http://lists.repoze.org/listinfo/repoze-dev > _______________________________________________ Repoze-dev mailing list Repoze-dev@lists.repoze.org http://lists.repoze.org/listinfo/repoze-dev
