Django snippets: "Dynamic" form with a hidden field

"Dynamic" form with a hidden field

from django import forms

hiddenValues = forms.Form()

value0 = 17

hiddenValues.fields['value0'] = forms.CharField(initial=value0, 
  widget=forms.widgets.HiddenInput())

# pass the form to your template
# render it as you like, e.g. with form.as_p

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This code demonstrates two simple techniques:

so-called "dynamic" forms, in which the form is created at run time by the model
using a widget (forms.widgets.HiddenInput) for a field of the form. I feel like this could be highlighted more in the documentation. You need to do something similar to get a textarea (forms.CharField(widget=forms.widgets.Textarea()) and it took me too long to figure this out.

There are, no doubt, good reasons not to do what I'm doing here the way I'm doing it. Peanut gallery?

Author:: flaxter
Posted:: March 25, 2009
Language:: Python
Django Version:: 1.0
Tags:: dynamic form field hidden
Score:: 1 (after 1 ratings)

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Comments

tommy (on August 5, 2010):

Great tip. Works like a charm.

gamesbook (on April 9, 2011):

Not sure what the author means about documentation for widgets - they are extensively documented here:

http://docs.djangoproject.com/en/dev/ref/forms/fields/#widget

and here:

http://docs.djangoproject.com/en/dev/ref/forms/widgets/