Nice, post it in web2pyslices!!!
2013/8/8 Vinicius Assef <vinicius...@gmail.com>
> Excellent approach. :-)
>
> On Thu, Aug 8, 2013 at 3:11 PM, Joe Barnhart <joe.barnh...@gmail.com>
> wrote:
> > So I'm a control-freak. I mean that in a good way. I discovered the
> beauty
> > of "placeholders" in forms and just thought "man, I really want that!"
> But
> > where to hold the placeholder data? And how do I get it to the SQLFORM
> > during form creation?
> >
> > At first I thought about adding YAV (yet another variable) to the Field
> > class. But it's getting pretty crowded in there already, and mucking
> with
> > it means changes to the base, and the devs might object to a
> special-purpose
> > hack inserted into Field just to satisfy my whims. So I thought I'd just
> > create my own formstyle function and use that. But wait! The formstyle
> > function has a defined signature now, and there is no place to insert
> > anything like a dictionary of placeholders indeded by field name. Or is
> > there...
> >
> > I created my own formstyle function, but added a keyword parameter to the
> > end for the placeholders dict. The signature looke like this:
> >
> >
> > def my_fieldstyle(form, fields, placeholders=None):
> > ...blah...
> >
> >
> > Now, the code in SQLFORM still has no idea that these placeholders exist.
> > But I can "wrap" this function with either a "partial function" or a
> simple
> > lambda to provide my own dictionary just before the customized formstyle
> > function is handed off to SQLFORM for it's main job. It looks like this:
> >
> >
> > my_placeholder_dict = {'field1': 'place1', 'field2', 'place2'...}
> > ...
> > styler = lambda form, fields: my_fieldstyle(form, fields,
> > placeholders=my_placeholder_dict)
> > ...
> > form = SQLFORM(... formstyle=styler ...)
> >
> >
> > That's all there is to it! Now I can pass abundant information into the
> > SQLFORM created, info that the base form creation has no idea exists. My
> > own custom formstyle class can interpret the extra information and add
> all
> > kinds of special features. Just a few ideas:
> >
> > 1. Provide "placehloders" for phone and date fields to show proper
> format
> >
> > 2. Provide dictionary of "field sets" with "legends" and create a
> > structured form organized the way I want
> >
> > 3. ... and many many more!
> >
> > Best of all, it only needs stupid Python tricks and doesn't much with the
> > underlying structure of web2py at all! No nasty stares from the devs!
> > (Just kidding...)
> >
> > -- Joe
> >
> > --
> >
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> >
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