Still curious about the answer, but I've realized I can accomplish
what I want by using a URL pattern
to pass the data from the URL into the view that way.
On Jan 30, 4:15 pm, adrian <adrian...@gmail.com> wrote:
> My question is about how to read form items from the POST request
> before the form is validated.
> I try to read request.POST['myKey'] and Python says
> MultiValueDictKeyError: "Key 'myKey' not found in <QueryDict: {}> even
> though Firebug shows the POST request does contain that key.
>
> Here's why I want to do this. I've got a page with a form that is
> submitted via javascript in two different ways.
>
> 1. when user changes the value of a dropdown box, an onchange
> function submits the form
> with the dropdown form field set and one other field set to a special
> code. The goal
> is to reload the page with different data in one area. (Note that I
> also tried doing this using a javascript replace or reload but there
> seems to be no way to pass any arguments to reconfigure the page - it
> is always a POST request so ignores GET additions to the URL.)
>
> 2. when the user clicks somewhere else, an onclick submits the form
> by Ajax which loads new data into a different area with no page
> refresh. This submission is complete and needs validation.
>
> Here's my code (the Django side)
>
> def addtest(request):
> now = datetime.datetime.now()
> today = now.strftime("%m/%d/%Y")
> region = 'WOR' # default, may be overridden later
>
> birdlist_area_selected = {} # one item in this dict is set to
> "selected", used in template
>
> if request.method == 'POST': # form submitted or ajax data initial
> load...
>
> form = ImportedSightingForm(request.POST) # A form bound to
> the POST data
> if request.POST['species_name'] == 'None': # flag indicated
> javascript page reload for new region bird list
>
> region = request.POST['birdlist_area']
> elif form.is_valid(): # All validation rules pass
>
> instance = form.save(commit=False)
>
> instance.date_added = now.strftime("%Y-%m-%d %H:%M:%S")
>
> instance.user = request.user # should be person related
> to user id of current user
>
> new_instance = instance.save()
> #flow through into view
>
> else: # initial ajax load or error
> if 'loadAll' in request.POST: #ajax load
> logging.debug( "initial ajax load")
> else:
> logging.debug( "form errors found:")
> logging.debug( form.errors)
> logging.debug( request.POST.items())
>
> else: #method is GET: blank form, birdlist area may be set
> logging.debug( "GET request (form reload)")
> form = ImportedSightingForm() # An unbound form except keeps
> any filled field
>
> #flows into remainder of file
>
> #gets here for all requests, GET or POST
>
> query_set = ImportedSighting.objects.filter( # all sightings by
> this user today
> user=request.user
> ).filter(
> date_added__gte=datetime.datetime(now.year, now.month,
> now.day)
> ).order_by('date_added')
> if request.is_ajax():
> logging.debug( "ajax request")
> # reach here in two situations:
> # 1. datatable was just created and is loading initial data by
> ajax
> # 2. user has added or deleted a sighting (from their list)
> if 'userAdd' in request.POST:
> logging.debug( "userAdd set, getting item")
> #adding a row
> sighting_list = query_set.reverse()[:1] # latest entry
> (single)
> logging.debug( sighting_list)
> else:
> sighting_list = query_set # all items
>
> return HttpResponse(serializers.serialize("json",
> sighting_list), mimetype='application/javascript')
>
> # sighting_list sent here will be hidden unless javascript
> unavailable
> sighting_list = query_set
> num_sightings = len(sighting_list)
>
> if region == 'WOR':
> bird_list = Species.objects.filter(
> common_name__startswith='A'
> ).order_by('common_name')
> else:
> bird_list = RegionSpecies.objects.filter(
> region__exact=region
> ).order_by('common_name')
>
> return render_to_response('addtest.html', {
> 'birdlist_area_selected': birdlist_area_selected,
> 'num_sightings': num_sightings,
> 'form': form,
> 'today': today,
> 'sighting_list': sighting_list,
> 'bird_list': bird_list})
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