django forms error_class

Is there a way to give a form a special error rendering function in the form definition? In the docs under customizing-the-error-list-format it shows how you can give a form a special error rendering function, but it seems like you have to declare it when you instantiate the form, not when you define it.

So you can define so开发者_Python百科me ErrorList class like:

from django.forms.util import ErrorList
 class DivErrorList(ErrorList):
     def __unicode__(self):
         return self.as_divs()
     def as_divs(self):
         if not self: return u''
         return u'<div class="errorlist">%s</div>' % ''.join([u'<div class="error">%s</div>' % e for e in self])

And then when you instantiate your form you can instantiate it with that error_class:

 f = ContactForm(data, auto_id=False, error_class=DivErrorList)
 f.as_p()

<div class="errorlist"><div class="error">This field is required.</div></div>
<p>Subject: <input type="text" name="subject" maxlength="100" /></p>
<p>Message: <input type="text" name="message" value="Hi there" /></p>
<div class="errorlist"><div class="error">Enter a valid e-mail address.</div></div>
<p>Sender: <input type="text" name="sender" value="invalid e-mail address" /></p>
<p>Cc myself: <input checked="checked" type="checkbox" name="cc_myself" /></p>

But I don't want to name the error class every time I instantiate a form, is there a way to just define the custom error renderer inside the form definition?

---

If you want this behaviour to be common to all your forms, you could have your own form base class defined like that :

class MyBaseForm(forms.Form):
    def __init__(self, *args, **kwargs):
        kwargs_new = {'error_class': DivErrorList}
        kwargs_new.update(kwargs)
        super(MyBaseForm, self).__init__(self, *args, **kwargs_new)

And then have all your form subclass that one. Then all your form will have DivErrorList as a default error renderer, and you will still be able to change it using the error_class argument.

For ModelForm's:

class MyBaseModelForm(forms.ModelForm):
    def __init__(self, *args, **kwargs):
        kwargs_new = {'error_class': DivErrorList}
        kwargs_new.update(kwargs)
        super(MyBaseModelForm, self).__init__(*args, **kwargs_new)

---

Try the following:

class MyForm(forms.Form):
    ...

    def __init__(self, *args, **kwargs):
        super(MyForm, self).__init__(*args, **kwargs)
        self.error_class = DivErrorList

Should work. But I did not test it.