django-wizard

Django wizard uses Step classes to control page flow.

To create a wizard, you need a url route defined that is going to point to a view and take a step parameter, like this::

    url(r'^(?P<step>[a-zA-Z]+)?$', views.my_view, name='new_wizard'),

That view then must instantiate the wizard passing it the url name, and a list of steps. Then the wizard's handle_request method should be called and returned with the request and the current step name (From the url)::

    def my_view(request, step):
        Wizard('new_wizard', [
        ('StepOne', mysteps.StepOne),
        ('StepTwo', mysteps.StepTwo),
    ])
    return wizard.handle_request(request, step)

The wizard also has a defaulted navigation_opts argument that can be passed in the init navigation options are a dictionary with a key of a string that will map to a field in the Request, and the value is an int. These tell the wizard what direction to go and how far in which scenarios.

The defaults are:

    - wizard_save: 0
    - wizard_continue: 1
    - wizard_previous: -1
    - wizard_next: 1

The view can also set a few additional things on the wizard:

    * set_redirect_args(\*args, \**kwargs)
        - use this to tell the wizard what it needs to privode to django's reverse function
          when doing redirects

    * set_step_init_args(\*args, \**kwargs)
        - use this to supply additional arguments to your step class __init__'s

    * set_common_template_args(dict)
        - use this to add stuff that will always be available in all of your wizard created
          templates

The wizard will trigger the following signals:

* wizard.signals.wizard_pre_save
* wizard.signals.wizard_post_save
* wizard.signals.wizard_pre_display
* wizard.signals.wizard_post_display
* wizard.signals.wizard_pre_prereq
* wizard.signals.wizard_post_prereq

A Step class is just an object that must define the following methods

• display

  • only takes self as an argument and returns the object that should be passed to django's template engine

• save

  • only takes self as an argument and returns nothing

• template

  • only takes self as an argument and must return the template object to be used by the wizard to render the response
  • IE: return loader.get_template('some_template_file.html')

• prereq

  • only takes self as an argument and can raise a wizard.PrereqMissing when an error occurs in the page flow

  • the init accepts an optional step key, a request and a message

  • if the step key is provided, the wizard will redirect to that step

  • if a request and message are provided it will add the message to django's messaging framework

• SaveStepException is an exception that can be raised in the save method that the wizard know that the step could not be saved and needs to be repeated