Django动态表单字段生成

Question

I want to create the form with 'rooms' field, it is integer field. Depending on numbers of rooms i want to generate two another fields for each room 'extra_adult' and 'extra_children'. And depending on numbers of children i want to generate 'children_age' fields.

I am new to Python and Django and I tried to do like on DYNAMIC FORM GENERATION post and like here but i stuck with several question:

1) i have an error global name 'rooms' is not defined in forms.py;

2) how should i to cleaned_data for extra_adult , extra_children , extra_children_age fields;

3) depending on numbers of children how to add extra_children_age fields.

Here is my form.py

class RoomsForm(forms.Form):
        rooms = forms.IntegerField(label=(min_value=1 )

        def __init__(self, *args, **kwargs):
                extra_adult = kwargs.pop('extra_adult', 0)
                extra_children = kwargs.pop('extra_children', 0)
                super(HotelForm, self).__init__(*args, **kwargs)
                for room in rooms:
                        self.fields['adult_%s' % room] = forms.IntegerField(min_value=1 )
                        self.fields['children_%s' % room] = forms.IntegerField(label=(required=False )

views.py

def bookingForm(request):
        if request.method == 'POST':
                form = HotelForm(request.POST, extra_a=request.POST.get('extra_adult'), extra_c=request.POST.get('extra_children'))
                if form.is_valid():
                        rooms = form.cleaned_data['rooms']
                        print "form is valid"
        else:
                form = HotelForm()

        return render(request, 'booking/booking.html', { 'form': form })

Thank you for your help.

Answer 1

Your code needs a lot of improvements, I couldn't write the whole thing for you, but here are some places that seems wrong obviously:

1. Your form field definition seems weird: rooms = forms.IntegerField(label=(min_value=1 ) , take a look at some examples to fix it.

2. Your first error is because you don't have rooms variable defined within your constructor. Also, you can't just get value from the field rooms like that, all form fields are filled and submitted at the same time, there's no way that fields could cross refer to each other. You might need a separate form to just get the room information.

3. You try to do kwargs.pop() , but you feed your form with extra data in the wrong way. To make it work, you should do something like:

form = HotelForm(request.POST, extra_adult=1, extra_children=2)

The example you see is a little mis-leading, you shouldn't feed those parameters with request.POST.get data, they should be fed with some other sources, that's why I suggest you making the room info in a different form. Once you have that, then feed the result to the second form is much easier.