只需将类添加到表单，如下所示。

class UserLoginForm(forms.Form):
    username = forms.CharField(widget=forms.TextInput(
        attrs={
        'class':'form-control',
        'placeholder':'Username'
        }
    ))
    password = forms.CharField(widget=forms.PasswordInput(
        attrs={
        'class':'form-control',
        'placeholder':'Password'
        }
    ))

你可以试试这个。

class SampleClass(forms.Form):
  name = forms.CharField(max_length=30)
  name.widget.attrs.update({'class': 'your-class'})
...

你可以在Django Widgets中看到更多信息

你也可以使用Django Crispy Forms，这是一个很好的定义表单的工具，如果你想使用一些CSS框架，比如Bootstrap或Foundation。在这里为表单字段指定类很容易。

你的表单类会是这样的:

from django import forms

from crispy_forms.helper import FormHelper
from crispy_forms.layout import Layout, Div, Submit, Field
from crispy_forms.bootstrap import FormActions

class SampleClass(forms.Form):
    name = forms.CharField(max_length=30)
    age = forms.IntegerField()
    django_hacker = forms.BooleanField(required=False)

    helper = FormHelper()
    helper.form_class = 'your-form-class'
    helper.layout = Layout(
        Field('name', css_class='name-class'),
        Field('age', css_class='age-class'),
        Field('django_hacker', css-class='hacker-class'),
        FormActions(
            Submit('save_changes', 'Save changes'),
        )
    )

如果您希望表单中的所有字段都继承某个类，只需定义一个父类，从表单继承。ModelForm，然后继承它

class BaseForm(forms.ModelForm):
    def __init__(self, *args, **kwargs):
        super(BaseForm, self).__init__(*args, **kwargs)
        for field_name, field in self.fields.items():
            field.widget.attrs['class'] = 'someClass'


class WhateverForm(BaseForm):
    class Meta:
        model = SomeModel

这帮助我自动将“form-control”类添加到应用程序的所有表单上的所有字段，而不需要添加代码复制。

要在django中定义css类，只需在表单中使用小部件即可。

例子:

class ProcessForm(forms.ModelForm):  
    class Meta:  
        model = Processmachine 
        fields = ['machine_name', 'operation_no', 'process_uploadfile'] #https://docs.djangoproject.com/en/3.0/ref/forms/widgets/
        widgets = { 'machine_name': forms.TextInput(attrs={ 'class': 'form-control' }), 
            'operation_no': forms.TextInput(attrs={ 'class': 'form-control' }),
            'process_uploadfile': forms.ClearableFileInput(attrs={ 'class': 'form-control' }),
      }

在上面的表单中，我在attrs中使用了css类

只需将类添加到表单，如下所示。

class UserLoginForm(forms.Form):
    username = forms.CharField(widget=forms.TextInput(
        attrs={
        'class':'form-control',
        'placeholder':'Username'
        }
    ))
    password = forms.CharField(widget=forms.PasswordInput(
        attrs={
        'class':'form-control',
        'placeholder':'Password'
        }
    ))