Question

For my project I need many “workflow” forms. I explain myself:

The user selects a value in the first field, validates the form and new fields appear depending on the first field value. Then, depending on the others fields, new fields can appear…

How can I implement that in a generic way ?

Answer 1

I think the solution you are looking for is django form wizard

Basically you define separate forms for different pages and customize the next ones based on input in previous screens, at the end, you get all form’s data together.

Specifically look at the process step advanced option on the form wizard.

FormWizard.process_step()
"""
Hook for modifying the wizard's internal state, given a fully validated Form object. The Form is guaranteed to have clean, valid data.
This method should not modify any of that data. Rather, it might want to set self.extra_context or dynamically alter self.form_list, based on previously submitted forms.
Note that this method is called every time a page is rendered for all submitted steps.
The function signature:
"""

def process_step(self, request, form, step):
    # ...

If you need to only modify the dropdown values based on other dropdowns within the same form, you should have a look at the implemented dajaxproject