Django：輸入無效數據時阻止表單域被清除

Question

我有以下表單，它允許用戶提交文件和電子郵件地址。

from django import forms 
from django.utils.translation import gettext_lazy as _ 
from django.core.validators import validate_email 

class UploadFileForm(forms.Form): 
    email = forms.EmailField() 
    file = forms.FileField() 

class EmailField(forms.CharField): 
    default_error_messages = { 
     'invalid': _(u'Enter a valid e-mail address.'), 
    } 
    default_validators = [validate_email] 

這裏的觀點：

def upload_file(request): 

    if request.method == 'POST': 
     form = UploadFileForm(request.POST, request.FILES) 
     if form.is_valid(): 
      email = form.cleaned_data['email'] 
      handle_uploaded_file(email, request.FILES['file']) 
      return HttpResponseRedirect('/thanks') 
    else: 
     form = UploadFileForm() 
    return render_to_response('upload_file.html', {'form': form}, 
     context_instance=RequestContext(request)) 

如果用戶提交表單與無效的電子郵件時，顯示的形式返回給用戶，但字段被清除。什麼是防止這種表單字段清除的正確方法？

Answer 1

愚蠢的錯誤。更新我的模板以包含表單值。現在都在工作。