form.py constructing dropdown menu

[anil]

Old method i used:
-----------------------------
#for cat in $sorted($catz, key=lambda r: r.category)
<option value="$cat.id">
$cat.category
</option>
#end for

How do i specify id in drop down menu for form.py
global myform
myform = form.Form(
form.Dropdown('types',[(i.category, i.id) for i in catz]),

Hope it is not too rudimentary
THanks guys
Anil

[hendry]

Here is the form docs http://webpy.infogami.com/form in svn that has a
dropdown example:

http://svn.natalian.org/projects/flash/f.py
http://svn.natalian.org/projects/flash/templates/formtest.html

Not sure what you mean by 'id' here. You want to set the id element of
the html?

form.py is limited by the render function. See form.py.

Best wishes,

[anil]

dear hendry

#for cat in $sorted($catz, key=lambda r: r.category)
<option value="$cat.id">
$cat.category
</option>
#end for

using form.py
i m able to specify $cat.category but unable to specify value of the
option
which is what i store in db
and hence the question
thanks for both of your prompt replies...
Anil

[Tommi]

Hi Anil,

Do try writing your own Dropdown class that supports option values. It
will be a good exercise!

Also, let us know what you came up with. :)

[blaf]

I'm not sure I understand your question but don't forget to use the
fill function if you want to show your value selected (this is not
tested code):

class test:
self.form = form.Form(
form.Dropdown('category', ['cat1','cat2','etc...'],
description='Category')
)

def GET(self):
formvalues = web.query('select...') # your query where you have
a category value
form = self.form() # your form definition
form.fill(formvalues) # fill your form
web.render('test.html')

test.html
#filter Filter
$form.category.render()
#end filter

or in your current code specify selected value regarding to your query:

#for cat in $sorted($catz, key=lambda r: r.category)

<option value="$cat.id"#if $cat.id == $form.category.value#
selected="selected"#end if#>
$cat.category
</option>
#end for

Hope this helps.

[anil]

<option value="$cat.id">
i m unable to specify value = "$cat.id"
using current form.py
i m sorry i should have been clearer
thanks
anil

[Tommi]

Yes.

Dropdown class doesn't support this. Take a look at how it works, and
based on that you can very easily write a new one that will!

(I hope I'm not unpolite for trying to teach you how to fish.)

[Jeremy]

For what it's worth, here's my quick-and-dirty hack to Dropdown:

class Dropdown(Input):
def __init__(self, name, args, *validators, **attrs):
self.args = args
super(Dropdown, self).__init__(name, *validators, **attrs)

def render(self):
x = '<select name="%s"%s>\n'%(web.websafe(self.name),
self.addatts())
for arg in self.args:
desc = arg
if type(arg) in (tuple,list) and len(arg) == 2:
arg,desc = arg
if self.value == arg: select_p = ' selected="selected"'
else: select_p = ''
if arg == desc:
x += " <option"+select_p+">%s</option>\n" %
web.websafe(arg)
else:
x += " <option"+select_p+"
value=\"%s\">%s</option>\n"%(web.websafe(arg),web.websafe(desc))
x += '</select>\n'
return x

Population is then something along the lines of:

animals = [(0,"None")] + [(x.id,x.name) for x in web.select("animals")]
form.Form(form.Dropdown("animals",animals,description="Select an
animal"))

Of course, single strings are supported as well.

Jeremy

[Tommi]

Looks good.

You called it quick-and-dirty, so... Is there something that you know
you could write better?

:)