There is a form with three fields. Is it possible to make the second field a dropdown dependent list of the first one?

Question

Django

There is a form with three fields. Let's call them service, action and input.

class InputsExtendedForm(forms.Form):
  #action = models.ForeignKey(Action)
  service = forms.CharField(max_length=15, widget=forms.Select(choices=SERVICE_CHOICES))
  action_form = forms.CharField(label='Action', max_length=15)
  input_form = forms.CharField(label='Input', max_length=1000)

The strings for service and action are given in the documentation. For service I created a big tuple

SERVICE_CHOICES = (
    ('Apps', 'Apps'),
    ('Auth', 'Auth'),
    ('Book', 'Book'),

But for each setvice item, there are several lines in the action. Is it possible to create an action_form dropdown list that will display rows depending on the value of service?

Answer 1

Redefine the model and make another class action_form. Through a one-to-many(service-action_form) relationship

Answer 2

I solved a similar problem through java script and onChange event. When changing the main select, you need to either do ajax to the server for data for the dependent select, or process a previously saved list of all possible values ​​​​from some variable that is declared when the page is first rendered.