Django：输入无效数据时阻止表单域被清除

Question

我有以下表单，它允许用户提交文件和电子邮件地址。

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] 

这里的观点：

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)) 

如果用户提交表单与无效的电子邮件时，显示的形式返回给用户，但字段被清除。什么是防止这种表单字段清除的正确方法？

Answer 1

愚蠢的错误。更新我的模板以包含表单值。现在都在工作。