I see what you are saying, but I was trying to do something a little
more complicated. I wasn't trying to validate any data, but rather
load choices into a select box based on information from the POST. I
have 2 select boxes in a form where one has info regarding all the
countries in the world. Onces the user selects a country, I populate
another select box with all the states for that country. I decided to
do most of this with javascript and got it working that way.
But then I ran into another problem. If the page has an error and is
reloaded then the states aren't populated in the select box again. I
had to update the constructor in my form and update those select boxes
manually with the correct choices. What I didn't know previously was
a form constructor always has a self.data variable once a request is
passed in. Here is my code if anyone is interested:
from main_site.static.models import StaticCountries, StaticRegions
def __init__(self, *args, **kwargs):
super(CustomerAdd, self).__init__( *args, **kwargs)
#checking if this is post information
if (self.is_bound == True):
#we have to check if the user selected a country in
mailing/shipping/or billing select boxes
#...if they did, then we have to populate the state select
box
# with the corresponding states for that country
if (self.data.get('mailing_country') != "None"):
self.fields['mailing_state'].choices = ([x.region,
x.region] for x in
StaticRegions.objects.filter(country_code=self.data.get('mailing_country')).order_by("region"))
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