On Jun 1, 1:24 am, Michael Davis <davis.j.mich...@gmail.com> wrote: > I'm trying to implement a simple grade book application using a > modelformset where the students' names are READONLY and the grades are > the only thing the teacher can edit. I've been looking for sample code > to implement the readonly portion and one fellow (on another site) > suggests I use his, but he never posts sample usage code along with > it. > > He suggests I use a custom widget: > class ReadOnlyWidget(forms.Widget): > def __init__(self, original_value, display_value=None): > self.original_value = original_value > if display_value: > self.display_value = display_value > super(ReadOnlyWidget, self).__init__() > def _has_changed(self, initial, data): > return False > def render(self, name, value, attrs=None): > if self.display_value is not None: > return unicode(self.display_value) > return unicode(self.original_value) > def value_from_datadict(self, data, files, name): > return self.original_value > > But I can't figure out how to set the original_value in my > application. > The "obvious" choice like: > class GradeForm(ModelForm): > student = forms.CharField(max_length=50, > widget=ReadOnlyWidget(instance)) > doesn't work as I'm fairly sure instance isn't set here or if it is > how I can invoke it so it does the right thing in a modelformset. > > The less obvious choice of setting it from within the form's __init__ > function is currently beyond my ability as I do not understand the > code flow through here and am not sure how to instantiate the widget > from within the form's __init__ function. > > Can someone point me to a good source of documentation at this level > of detail?
I know this is not answering your question directly, so please just sigh and ignore it if not relevant... If this is a simple application", as you mention above, maybe consider (or reconsider) using the Admin application, which has built-in support for readonly fields. http://docs.djangoproject.com/en/dev/ref/contrib/admin/#django.contrib.admin.ModelAdmin.readonly_fields -- You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-us...@googlegroups.com. To unsubscribe from this group, send email to django-users+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/django-users?hl=en.
