Want to present users a form in which numbers are entered, then manipulated
in a view and a calculated value is returned to the screen.
After looking in the the Django book around the net this is what I have
come, (it doesn't work) shows below. So far, the three fields setup in
forms.py render to the secreen, that is all I'm getting.
I am getting this error in the django 404 exception page: "unsupported operand
type(s) for *: 'NoneType' and 'NoneType'"
It is purposely a simple exercise, more interested in technique of doing
this so, I know this can be done in javascript, but I want to do this with
python/django.
Thank you to anyone who can help me out, this has been a problem all
weekend.
forms.py:
from django import forms
class FinanceTable(forms.Form):
capital = forms.IntegerField(required=False)
tax_rate = forms.DecimalField(required=False)
useage = forms.IntegerField(required=False)
views.py:
from django.shortcuts import render_to_response
def calculation(request):
"""view that sets up form calculation"""
if request.method == 'POST':
form = FinanceTable(request.POST)
if form.is_valid():
capital = form.cleaned_data['capital']
tax_rate = form.cleaned_data['tax_rate']
useage = form.cleaned_data['capital'] *
form.cleaned_data['tax_rate']
response_dict = {'capital' : capital, 'tax_rate' :
tax_rate, 'useage' : useage}
return render_to_response('focus_areas.html',
response_dict)
else:
form = FinanceTable(
initial={'capital' : 1000, tax_rate : .07}
)
return render_to_response('focus_areas.html', {'form' : form})
html in template:
<form action="" method= "" method="post">
<table>
{{ form.as_table }}
</table>
<input type="submit" value = "Submit"/>
</form>
Any help ios much appreciated.
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