thanks for your reply。
yes，i want to display the form again with some field being modified.
how to set the new value to a field of fhe old form to render ?
for example :
in site signup case.
when there are some errors， we hope to display the signup again ，but the
password field would been cleared up。
how to clear it ?
thanks 。
2009/8/29 Karen Tracey <kmtra...@gmail.com>
> On Fri, Aug 28, 2009 at 10:35 PM, hao he <speed...@gmail.com> wrote:
>
>> hi.
>>
>> this following code show what I want to do,but 'red' line is incorrect,
>>
>> if request.method == "POST":
>> form = MyForm(request.POST)
>> c = form.data["a"] + form.data["b"]
>> form.data["c"] = c
>> return render_to_response(template_name , {"form": form})
>>
>> how to modify it? thanks.
>
>
> Perhaps if you put a few more words around what it is you are trying to do
> someone might be able to offer useful help. This code looks quite odd to
> me. You generally don't want to take values from form.data (which will not
> have been normalized) but rather validate the form and then take values from
> form.cleaned_data (which will be both validated and normalized). Doing
> nothing with what you've got other than displaying the form (again?) also
> seems a bit odd.
>
> Karen
>
> >
>
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