我已經成功地找到了答案，以我的問題，我在這裏張貼爲後人。對於標籤類，我從here和here（來自user2732686的回答）獲得了一些靈感。第一個鏈接建議在運行時重新定義BoundField類的label_tag方法。這是一個比第二個鏈接中建議的解決方案更詳細的解決方案，但是這是以項目範圍內的黑客爲代價的，我不建議這樣做。在這裏，我按照標籤的第二個鏈接中的建議，遵循Django的subclassing狂熱。
在項目settings.py，添加：
# Default css classes for widgets and labels
DEFAULT_CSS = {
'error': 'w3-panel w3-red', # displayed in the label
'errorlist': 'w3-padding-8 w3-red', # encloses the error list
'required': 'w3-text-indigo', # used in the label and label + input enclosing box. NB: w3-validate only works if the input precedes the label!
'label': 'w3-label',
'Textarea': 'w3-input w3-border',
'TextInput': 'w3-input w3-border',
'Select': 'w3-select w3-border',
}
注意：除了4個鍵，在鍵必須Django的插件名稱相匹配。
在你forms.py（或其他地方），地址：
from django.forms import ModelForm, inlineformset_factory, Form, BoundField
from django.forms.utils import ErrorList
from django.utils.html import format_html, force_text
from django.conf import settings
class CustErrorList(ErrorList):
# custom error list format to use defcss
def __str__(self):
return self.as_div()
def as_div(self):
if not self:
return ''
return format_html('<div class="{}">{}</div>',
settings.DEFAULT_CSS['errorlist'],
' '.join([ force_text(e) for e in self ])
)
class CustBoundField(BoundField):
# overload label_tag to include default css classes for labels
def label_tag(self, contents=None, attrs=None, label_suffix=None):
newcssclass = settings.DEFAULT_CSS['label']
if attrs is None:
attrs = {}
elif 'class' in attrs:
newcssclass = ' '.join([ attrs['class'], newcssclass ]) # NB: order has no impact here (but it does in the style sheet)
attrs.update({ 'class': newcssclass })
# return the output of the original method with the modified attrs
return super(CustBoundField, self).label_tag(contents, attrs, label_suffix)
def custinit(self, subclass, *args, **kwargs):
# overload Form or ModelForm inits, to use default CSS classes for widgets
super(subclass, self).__init__(*args, **kwargs)
self.error_class = CustErrorList # change the default error class
# Loop on fields and add css classes
# Warning: must loop on fields, not on boundfields, otherwise inline_formsets break
for field in self.fields.values():
thiswidget = field.widget
if thiswidget .is_hidden:
continue
newcssclass = settings.DEFAULT_CSS[ thiswidget.__class__.__name__ ]
thisattrs = thiswidget.attrs
if 'class' in thisattrs:
newcssclass = ' '.join([ thisattrs['class'], newcssclass ]) # NB: order has no impact here (but it does in the style sheet)
thisattrs.update({ 'class': newcssclass })
def custgetitem(self, name):
# Overload of Form getitem to use the custom BoundField with
# css-classed labels. Everything here is just a copy of django's version,
# apart from the call to CustBoundField
try:
field = self.fields[name]
except KeyError:
raise KeyError(
"Key '%s' not found in '%s'. Choices are: %s." % (
name,
self.__class__.__name__,
', '.join(sorted(f for f in self.fields)),
)
)
if name not in self._bound_fields_cache:
self._bound_fields_cache[name] = CustBoundField(self, field, name)
# In the original version, field.get_bound_field is called, but
# this method only calls BoundField. It is much easier to
# subclass BoundField and call it directly here
return self._bound_fields_cache[name]
class DefaultCssModelForm(ModelForm):
# Defines the new reference ModelForm, with default css classes
error_css_class = settings.DEFAULT_CSS['error']
required_css_class = settings.DEFAULT_CSS['required']
def __init__(self, *args, **kwargs):
custinit(self, DefaultCssModelForm, *args, **kwargs)
def __getitem__(self, name):
return custgetitem(self, name)
class DefaultCssForm(Form):
# Defines the new reference Form, with default css classes
error_css_class = settings.DEFAULT_CSS['error']
required_css_class = settings.DEFAULT_CSS['required']
def __init__(self, *args, **kwargs):
custinit(self, DefaultCssForm, *args, **kwargs)
def __getitem__(self, name):
return custgetitem(self, name)
注：您的項目名稱替換<MY_PROJECT>
然後，你只需繼承DefaultCssModelForm和DefaultCssForm代替ModelForm和Form當定義你的表格時。對於formsets，請使用這些類作爲基類。舉例說明：
class MyForm(DefaultCssModelForm):
class Meta:
model = MyModel
fields = '__all__'
MyFormSet = inlineformset_factory(..., ..., form=DefaultCssModelForm, ...)