Question

我试图在我的表单上向<input>添加一个类。按照this question的第一个回答的说明，我在表单的__init__方法中添加了一些代码。但是我得到了标题中显示的错误。

forms.py

class SignupForm(UserCreationForm):
    email = forms.EmailField(max_length=200, help_text='Required')
    first_name = forms.CharField(max_length=30)
    last_name = forms.CharField(max_length=30)

    def __init__(self, *args, **kwargs):
        form = super(SignupForm, self).__init__(*args, **kwargs)
        for visible in form.visible_fields():
            visible.field.widget.attrs['class'] = 'form-control'

    class Meta:
        model = User
        fields = ('username', 'email', 'password1', 'password2', 'first_name', 'last_name',)

Answer 1

您收到错误，因为super()调用返回None。在__init__方法中，您可以使用self访问表单的属性。

def __init__(self, *args, **kwargs):
    super(SignupForm, self).__init__(*args, **kwargs)
    for visible in self.visible_fields():
        ...

AttributeError：＆＃39; NoneType＆＃39;对象没有属性＆＃39; visible_fields＆＃39;

1 个答案: