python 57 lines · 8 steps

Building a multi-step form with Django wizards

A SessionWizardView splits one long application into three validated steps and persists the combined result at the end.

Explained by highlit
Django Intermediate form-wizard multi-step-forms session-state async-tasks validation
1from django import forms
2from django.contrib.auth import get_user_model
3from django.shortcuts import redirect
4from formtools.wizard.views import SessionWizardView
5 
6from .models import Application
7from .tasks import send_application_confirmation
8 
9 
10class ApplicantForm(forms.Form):
11 full_name = forms.CharField(max_length=120)
12 email = forms.EmailField()
13 phone = forms.CharField(max_length=32, required=False)
14 
15 
16class EmploymentForm(forms.Form):
17 employer = forms.CharField(max_length=120)
18 annual_income = forms.DecimalField(max_digits=10, decimal_places=2)
19 years_employed = forms.IntegerField(min_value=0)
20 
21 
22class ReviewForm(forms.Form):
23 accept_terms = forms.BooleanField(
24 label="I confirm the information above is accurate",
25 )
26 
27 
28class ApplicationWizard(SessionWizardView):
29 form_list = [
30 ("applicant", ApplicantForm),
31 ("employment", EmploymentForm),
32 ("review", ReviewForm),
33 ]
34 template_name = "applications/wizard_step.html"
35 
36 def get_template_names(self):
37 return [f"applications/wizard_{self.steps.current}.html", self.template_name]
38 
39 def get_context_data(self, form, **kwargs):
40 context = super().get_context_data(form=form, **kwargs)
41 if self.steps.current == "review":
42 context["summary"] = self.get_all_cleaned_data()
43 return context
44 
45 def done(self, form_list, form_dict, **kwargs):
46 data = self.get_all_cleaned_data()
47 application = Application.objects.create(
48 user=self.request.user if self.request.user.is_authenticated else None,
49 full_name=data["full_name"],
50 email=data["email"],
51 phone=data["phone"],
52 employer=data["employer"],
53 annual_income=data["annual_income"],
54 years_employed=data["years_employed"],
55 )
56 send_application_confirmation.delay(application.pk)
57 return redirect("applications:submitted", pk=application.pk)
01 / 01
STEP 01

Walkthrough

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Three takeaways
  1. 1Splitting a large form into discrete step classes keeps each screen focused and independently validatable.
  2. 2A wizard view holds partial data in the session, so the final handler can assemble everything at once.
  3. 3Offloading side effects like email to a background task keeps the submission response fast.

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