Django FormWizard保持步骤之间的值

Question

我是Django的新手，我试图做一个FormWizard。示例工作，但当我在步骤之间移动（不提交）时，表单不会保留或保留已输入的数据。 我怎样才能保持数据的前后移动？

# forms.py
class ContactForm1(forms.Form):
    subject = forms.CharField(max_length=100)

class ContactForm2(forms.Form):
    sender = forms.CharField(required=False)

class ContactForm3(forms.Form):
    message = forms.CharField(widget=forms.Textarea,required=False)

# views.py
class ContactWizard(SessionWizardView):
    template_name = "contact_form.html"

    def done(self, form_list, **kwargs):
        form_data = process_form_data(form_list)
        return render_to_response('done.html', {'form_data': form_data})