I've recently had a situation where I needed to create dynamic forms and corresponding code to handle them.
One thing that you should know about python is that there's nothing special about classes, you can take a collection of attributes and methods and use them to create a new class on-the-fly using python's type() function. You can use this to dynamically build a form class with a new field. My roommate wrote a great blog post on how to do build classes dynamically (http://askawizard.blogspot.com/2008/09/metaclasses-python- saga-part-4_30.html), which you should read before attempting this. Once you understand what that is talking about (or not), you end up writing some code like this: If you want this form to be dynamic: class MyDynamicForm(Form): foo = CharField(max_len = 100) bar = IntegerField() def clean_foo(self): value = self.cleaned_data['foo'] if value != 'foo': raise ValidationError('foo is not foo!') def clean_bar(self): value = self.cleaned_data['bar'] if value != 42: raise ValidationError('wrong answer') You could build it programatically with: # Our base classes (which you could build programatically if you wanted) bases = (Form,) # Our class attributes attys = { 'foo' : CharField(max_len = 100), 'bar' : IntegerField(), } # This returns a clean method built from some parameters def general_clean(name, correct_value, error_text): def inner(self): value = self.cleaned_data[name] if value != correct_value: raise ValidationError(error_text) return inner # Now add the clean methods. You could just define methods and assign, but this illustrates generating them programatically. for name, correct_value, error_text in ( ('foo', 'foo', 'foo is not foo!'), ('bar', 42, 'wrong answer'), ): attys['clean_' + name] = general_clean(name, correct_value, error_text) # Now, to create the dynamic class, you need the following incantation: DynamicForm = getattr(Form, '__metaclass__', type)('DynamicForm', bases, attys) # That only creates the *class*, we still have to create an instance form = DynamicForm({'foo': 'foo', 'bar': 42}) Does this help? It would let you dynamically add elements and handlers to the form that django is aware of, thus you get all the benefits of using the form framework. Let me know if this is a bit thick and I'll be happy to explain it and perhaps blog a more coherent example. --Ryan --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-users@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/django-users?hl=en -~----------~----~----~----~------~----~------~--~---
