formfields_callback example

class NightclubBookingForm(BaseBookingForm):
    formfield_callback = customise_fields

    def __init__(self, *args, **kwargs):
        super(NightclubBookingForm, self).__init__(*args, **kwargs)
        self.fields['booking_start'].widget.attrs['autocomplete'] = 'off'
        self.fields['venue'].queryset = Venue.objects.filter(venue_type__name='Nightclub')
        if 'data' in kwargs:
            booths = Booth.objects.filter(area_layout__area__venue_id=kwargs['data']['venue'])
            booth_choices = []
            for booth in booths:
                booth_choices.append((booth.id, booth.name))
            self.fields['booth'].widget.choices = booth_choices
        else:
            self.fields['booth'].widget.choices = []
            self.fields['booth'].widget.attrs['disabled'] = 'disabled'
        self.fields['booth'].widget.attrs['class'] = 'select_booth'

    class Meta:
        model = NightclubBooking
        fields = ('customer', 'venue', 'booth', 'booking_start', 'pax', 'notes')


def customise_fields(f):
    """
    Ensure all date & datetime fields in the form have the jquery datepicker
    applied to them
    """
    if isinstance(f, models.DateTimeField):
        datetime_field = forms.DateTimeField(
            widget=forms.DateTimeInput(
                format='%d/%m/%Y %H:%M',
                attrs={'class': 'datetimepicker'}
            ),
            input_formats=['%d/%m/%Y', '%d/%m/%Y %H:%M'])
        return datetime_field
    elif isinstance(f, models.DateField):
        date_field = forms.DateField(
            widget=forms.DateInput(
                format='%d/%m/%Y',
                attrs={'class': 'datepicker'}
            ),
            input_formats=['%d/%m/%Y'])
        return date_field
    else:
        return f.formfield()