Django FORM for India Postal Address

[Priyabrata Das]

I have a Django ModelForm as below. Primary objective is to select area pincode based on selected "state". I don't seem to find a way how can I filter Pincode based on a dynamic queryset on the chosen state. form_valid() method in CreateView is not invoked until the entire form is submitted.



template


<form method='POST' action="">{% csrf_token %}
{{ form|crispy }}



view.py


class UserAddressCreateView(FormView):
    form_class = UserAddressForm
    template_name = "user_address_form.html"
    success_url = "/checkout/address/"
   
   

forms.py

class UserAddressForm(forms.ModelForm):
    class Meta:
        model = UserAddress
        fields = '__all__'

    state = forms.ModelChoiceField(
        widget=forms.Select,
        queryset=StateCode.objects.all(),
        )
   
    place = forms.ModelChoiceField(
        widget=forms.Select,
        queryset=PinCode.objects.none(),
        )

   
    def clean(self):
        cleaned_data = super(UserAddressForm,self).clean()
        state = cleaned_data.get("state")
        return cleaned_data

 
    def __init__(self,  *args, **kwargs):
        super(UserAddressForm, self).__init__(*args, **kwargs)
        self.fields["place"].queryset = PinCode.objects.filter(state="KARNATAKA")




models.py

class UserAddress(models.Model):
    user = models.ForeignKey(UserCheckout)
    type = models.CharField(max_length=20, choices=ADDRESS_TYPE)
    address = models.CharField(max_length=120, null=True,blank=True)
    mobile = models.CharField(max_length=120, null=True,blank=True)
    state = models.ForeignKey(StateCode,null=True,blank=True)
    place = models.ForeignKey(PinCode,null=True,blank=True)
   

class StateCode(models.Model):
    state = models.CharField(max_length=120, blank=True)
    code  = models.CharField(max_length=120, blank=True)
   

class PinCode(models.Model):
    place = models.CharField(max_length=120, blank=True)
    pincode = models.CharField(max_length=120, blank=True)
    officeType = models.CharField(max_length=120, blank=True)
    Deliverystatus = models.CharField(max_length=120, blank=True)
    divisionname = models.CharField(max_length=120, blank=True)
    regionname = models.CharField(max_length=120, blank=True)
    circle =  models.CharField(max_length=120, blank=True)
    Taluk = models.CharField(max_length=120, blank=True)
    district = models.CharField(max_length=120, blank=True)
    state =  models.CharField(max_length=120, blank=True)
    Telephone = models.CharField(max_length=120, blank=True)
    Related_Suboffice = models.CharField(max_length=120, blank=True)
    Related_Headoffice = models.CharField(max_length=120, blank=True)   

[Andreas Kuhne]

Hi,

There is a plugin called django-smart-selects, that enables you to get information from the server based on information in a select field. You could try that? The form_valid() method and clean methods where you can VALIDATE such information is only called when posting the form (as you have found out). 

You will need some sort of ajax requests to make that work - which django-smart-selects can help you with.

Regards,

Andréas

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