如何解决Django将CSS类添加到字段
如果自定义清除方法检测到错误,我试图将错误类添加到表单集中每个表单的字段中。这看起来确实可以解决问题,我加载了页面,并且该字段中确实包含错误类。但是当我在模板中添加自定义过滤器以添加表单控件类时,一切都崩溃了。
# in my inlineformset:
def clean(self,*args,**kwargs):
if any(self.errors):
errors = self.errors
return
## 1) Total amount
total_amount = 0
for form in self.forms:
if self.can_delete and self._should_delete_form(form):
continue
amount = form.cleaned_data.get('amount')
total_amount += amount
if total_amount> 100:
for form in self.forms:
form.fields['amount'].widget.attrs.update({'class': 'error special'})
raise ValidationError(_('Total amount cannot exceed 100%'))
@register.filter(name = 'add_class')
def add_class(the_field,class_name):
''' Adds class_name to the string of space-separated CSS classes for this field'''
initial_class_names = the_field.css_classes() ## This returns empty string,but it should return 'error special'
class_names = initial_class_names + ' ' + class_name if initial_class_names else class_name
return the_field.as_widget(attrs = {'class': class_names,})
而且,在我的模板中:
{# {{ the_field|add_class:"form-control"}} #} #<- This adds the form-control,but removes the other classes added in the clean method
{{ the_field }} {# This shows the two classes for the offending fields,'error special' #}
我认为问题出在.css_classes()
方法上,该方法没有引入表单上定义的类。请记住,这些类已在这些字段上设置,并且渲染{{ the_field }}
表示这些类已正确传递到模板。因此,问题是我是否使用正确的方法.css_classes()
还是应该使用其他方法?
解决方法
我能够使用表单的.add_error
方法向该字段添加类错误。尽管这可以解决问题,但如果有人能解释the_field.css_classes()如何返回空字符串而不是clean方法中设置的字符串,我将不胜感激:
form.fields['amount'].widget.attrs.update({'class': 'error special'})
add_error方法的问题在于它仅添加了类error
。但是,如果我想向小部件添加另一个类special
怎么办?因此,原始问题仍然需要答案。那么我在这里的解决方案只是一个解决方案,而不是 解决方案:
# in my inlineformset:
def clean(self,* args,** kwargs):
if any(self.errors):
errors = self.errors
return
## 1) Total amount
total_amount = 0
for form in self.forms:
if self.can_delete and self._should_delete_form(form):
continue
amount = form.cleaned_data.get('amount')
total_amount += amount
if total_amount > 100:
msg = 'This field throw the amount over the 100% limit'
form.add_error('amount',msg)
if total_amount> 100:
raise ValidationError(_('Total amount cannot exceed 100%'))
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