UserCreationForm當字段爲空時顯示錯誤

Question

我使用內建UserCreationForm的Django。我想在該字段爲空並且用戶提交表單時在該字段下顯示消息。不幸的是，我只看到像「填寫此字段」這樣的瀏覽器內置行爲，順便說一下，在不同的瀏覽器中，行爲是不同的。一些瀏覽器只是用紅線包圍了現場盒。如何關閉此行爲並在該字段下顯示消息。爲什麼.error_messages不起作用？！另外我在我的模板中使用{{form.field_name.errors}}。

forms.py

class RegistrationForm(UserCreationForm): 
    required_css_class = 'required' 
    email = forms.EmailField() 
    first_name = forms.CharField() 
    last_name = forms.CharField() 

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

    def __init__(self, *args, **kwargs): 
     super(RegistrationForm, self).__init__(*args, **kwargs) 
     self.fields['username'].widget = TextInput(attrs={'placeholder': _('Username')}) 
     self.fields['username'].required = True 
     self.fields['username'].error_messages = {'required': 'Please enter your username'} 

     self.fields['email'].widget = EmailInput(attrs={'placeholder': _('Email address')}) 
     self.fields['email'].required = True 
     self.fields['email'].error_messages = {'required': 'Please enter your email'} 

     self.fields['first_name'].widget = TextInput(attrs={'placeholder': _('First name')}) 
     self.fields['first_name'].required = True 
     self.fields['first_name'].error_messages = {'required': 'Please enter your first_name'} 

     self.fields['last_name'].widget = TextInput(attrs={'placeholder': _('Last name')}) 
     self.fields['last_name'].required = True 
     self.fields['last_name'].error_messages = {'required': 'Please enter your last_name'} 

     self.fields['password1'].widget = PasswordInput(attrs={'placeholder': _('Password')}) 
     self.fields['password1'].required = True 
     self.fields['password1'].error_messages = {'required': 'Please enter your Password'} 

     self.fields['password2'].widget = PasswordInput(attrs={'placeholder': _('Confirm password')}) 
     self.fields['password2'].required = True 
     self.fields['password2'].error_messages = {'required': 'Please enter your Confirm Password'} 

view.py

class RegistrationView(FormView): 
    disallowed_url = 'registration_closed' 
    form_class = RegistrationForm 
    http_method_names = ['get', 'post', 'head', 'options', 'trace'] 
    success_url = 'registration_complete' 
    template_name = 'account/registration_form.html' 
    SEND_ACTIVATION_EMAIL = getattr(settings, 'SEND_ACTIVATION_EMAIL', True) 

    registration_profile = RegistrationProfile 

    @method_decorator(sensitive_post_parameters('password1', 'password2')) 
    def dispatch(self, request, *args, **kwargs): 
     if not self.registration_allowed(): 
      return redirect(self.disallowed_url) 
     return super(RegistrationView, self).dispatch(request, *args, **kwargs) 

    def form_valid(self, form): 
     new_user = self.register(form) 
     success_url = self.get_success_url(new_user) 
     try: 
      to, args, kwargs = success_url 
     except ValueError: 
      return redirect(success_url) 
     else: 
      return redirect(to, *args, **kwargs) 

    def registration_allowed(self): 
     return getattr(settings, 'REGISTRATION_OPEN', True) 

    def register(self, form): 
     site = get_current_site(self.request) 

     if hasattr(form, 'save'): 
      new_user_instance = form.save() 
     else: 
      new_user_instance = (UserModel().objects.create_user(**form.cleaned_data)) 

     new_user = self.registration_profile.objects.create_inactive_user(
      new_user=new_user_instance, 
      site=site, 
      send_email=self.SEND_ACTIVATION_EMAIL, 
      request=self.request, 
     ) 
     signals.user_registered.send(sender=self.__class__, user=new_user, request=self.request) 
     return new_user 

    def get_success_url(self, user=None): 
     return super(RegistrationView, self).get_success_url() 

Answer 1

您需要關閉的行爲在HTML本身，通過在表單元素使用novalidate。

<form action="whatever" method="POST" novalidate> 
    ... 
</form>