django: how to pass css to form.as_ul

my form is

class Form(forms.Form):
    ability = forms.ChoiceField(widget= forms.CheckboxSelectMultiple(), choices = SKILLS, required=False)

i am displaying it as {{ Form.开发者_C百科as_ul }}

how do i pass a css ul class to this? Can i do it somewhere in the template? not sure how this works

Unfortunately you have to create a new widget, but you can use the __init__ and render functions of the existing CheckboxSelectMultiple widget.

Add a new ul_attrs parameter to the contructor.

from django import forms    
from django.forms.util import flatatt
from django.utils.safestring import mark_safe

class MyCheckboxSelectMultiple(forms.CheckboxSelectMultiple):
def __init__(self, attrs=None, ul_attrs=None):
    self.ul_attrs = ul_attrs
    super(MyCheckboxSelectMultiple, self).__init__(attrs)

def render(self, name, value, attrs=None, choices=()):
    html = super(MyCheckboxSelectMultiple, self).render(name, value, attrs, choices)
    final_attrs = self.build_attrs(self.ul_attrs)
    return mark_safe(html.replace('<ul>','<ul%s>' % flatatt(final_attrs)))

In your form simply use this custom widget:

class Form(forms.Form):
    ability = forms.ChoiceField(widget= MyCheckboxSelectMultiple(ul_attrs={"class":"fancybox"}), choices = SKILLS,    required=False)
    # 

You can pass HTML attributes to the widget via the attrs parameter. Also, take a look at chapter 7 of the Django book, especially the section Customizing Form Design.

Section teaser:

While it’s convenient to have our form’s HTML generated for us, in many cases you’ll want to override the default rendering. {{ form.as_table }} and friends are useful shortcuts while you develop your application, but everything about the way a form is displayed can be overridden, mostly within the template itself, and you’ll probably find yourself doing this.

since Django 1.11, you can Overriding built-in widget templates：

class MyCheckboxSelectMultiple(forms.CheckboxSelectMultiple):
    template_name = 'widgets/multiple_input.html'

and copy

django/forms/widgets/multiple_input.html, which included by django/forms/widgets/checkbox_select.html

to

your_app/templates/widgets directory.

Now, customize class or style in your_app/templates/widgets/multiple_input.html file.