Load initial form fields from GET parameters

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def my_view(request):
    if request.method == 'POST':
        form = MyForm(request.POST)
        if form.is_valid():
            # ...
            return HttpResponseRedirect('/thanks/')
    else:
        form = MyForm()

        # Load initial form fields from GET parameters
        for key in request.GET:
            try:
                form.fields[key].initial = request.GET[key]
            except KeyError:
                # Ignore unexpected parameters
                pass

    return render_to_response('my_template.html', {'form': form})

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Comments

girasquid (on November 18, 2009):

Last time I did this, all I had to do was:

form = MyForm(initial=request.GET)

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ramen (on November 18, 2009):

Oh, good point. That's quite a bit easier. I can still see some merit to this technique if you want different error handling or you want to exclude certain GET parameters. Thanks for the insight. I wish this technique was explained in the docs.

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buriy (on November 18, 2009):

I'd use

form = MyForm(initial=request.POST or request.GET or None)

Here I used "None" to hide errors when no fields has been filled.

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ramen (on May 28, 2010):

I'm back to using the method I described originally. Using MyForm(request.GET) is triggering form validation, and MyForm(initial=request.GET) is resulting in lists getting printed in the inputs ("[u'somevalue']") when using ModelForms. Thanks for the downvotes anyway.

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