It is better to extend the Form class and add a get_input method.
class Form(web.form.Form):
def get_input(self, name):
for x in self.inputs:
if x.name == name:
return x
With this you can use form.get_input("date" + str(i)).render()
Anand
On Thu, Apr 25, 2013 at 4:28 AM, Steven Brown <[email protected]> wrote:
> I have a few questions, and I'm not even sure how to google for them. I
> am writing a page with a form. The form consists of several identical
> lines of fields, where the user can fill in as many or as few lines of
> information as they want. So, each line is going to have a date field, a
> dropdown indicating a selected option, and a text box for some notes. Now,
> I'm sure I could implement this by building the python-side form array with
> a loop, where every time through the loop adds another set of fields to the
> list of fields. My question is, on the HTML side, how should I access them
> to render them? My first instinct is to just use an eval statement;
> something like
>
> $:for i in range(10):
> eval('form.date' + i + '.render()')
> eval('form.choice' + i + '.render()')
> eval('form.notes' + i + '.render()')
> print '<br/ >'
>
> But this seems inelegant, not least because everyone has always drilled into
> me to never
> use eval except in the most dire of circumstances. Is there a better way?
> What would also be
> good, is if there was some way I could define how to render a single line, in
> another place,
>
> and then call that process inside the for loop above.
>
> Another thing I am trying to do in the cleanest, most efficient way possible
> is change
> what's in the dropdown, depending on what is selected in the date field (and
> later another
>
> dropdown). I found this:
> http://stackoverflow.com/questions/8763564/how-do-i-update-a-dropdown-menu-when-another-dropdown-menu-option-is-selected
>
> which suggests using jQuery, but I'm wondering first, if there is any way
> strictly within web.py
> to do it. Second, I am going to populate the dropdown from a database, and
> the only way I can
> figure of doing everything, I need to a database query for every set of
> options. So, am I
>
> correct in that assumption, or is there is a way to minimize dB hits.
>
> Finally, is there a better place to get documentation for web.py? webpy.org
> seems pretty sparse,
>
> not to mention poorly organized.
>
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--
Anand
http://anandology.com/
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