Html 如何显示最小文件上传django示例中需要的上传文件大小

我需要在html代码中显示文件大小以及视图和模型中的更改。请帮助我做到这一点

views.py 这是我的视图代码。上载时显示文件大小的更改

 def index(request):

    response = TemplateResponse(request, 'login.html', {})
    return response

 def login(request, username, password):
    user = username[:-1]


    for i in AppUser.objects.all():
        if ( user == i.username and password == i.password ):
            return list(request)
        else:
             return index(request)

  def list(request):
   # Handle file upload
         print "im getting in"

         if request.method == 'POST':
           form = DocumentForm(request.POST, request.FILES)
           if form.is_valid():
              newdoc = Document(docfile = request.FILES['docfile'],created_at = datetime.datetime.now())
              newdoc.save()

        # Redirect to the document list after POST
            return   HttpResponseRedirect(reverse('cloudStorageManager.views.list'))

          else:
             print "else"
            form = DocumentForm() # A empty, unbound form

            # Load documents for the list page
            documents = Document.objects.all()

           # Render list page with the documents and the form
              return render_to_response('list.html',{'documents': documents, 'form': form, 'created_at': datetime.datetime.now()},context_instance=RequestContext(request))

models.py 用于显示文件大小的属性

  class Document(models.Model):
     docfile = models.FileField(upload_to='documents')
     created_at=models.DateTimeField(auto_now_add=True , blank=True)

list.html 上载时显示文件大小的html代码

        {% for document in documents %}
                    <tr>
                    <td>
                        <input type="checkbox" class="case" id="chk{{forloop.counter}}" value="{{ document.docfile.name }}">
                    </td>
                    <td>{{ document.docfile.name }}  {{ document.created_at }}</td>
                    <td><a href="{{ document.docfile.url }}"   target="_blank" title="Download"><button class="btn btn-success btn-flat"><span class="glyphicon glyphicon-cloud-download">          </span>&nbsp;&nbsp;Download</button></a></td>
                    <td>

{%用于文档中的文档%}
{{document.docfile.name}{{document.created_at}}

---

文件大小。用于filesizeformat筛选器。

您可以知道forms.py文件中上载的文件的大小并进行验证

class DOcumentForm(...):
    ...
    docfile = forms.FileField(...)
    ...

    def clean_docfile(self):
        current_size = self.cleaned_data['docfile'].size
        if current_size < 2621440 # size in bytes:
            return self.cleaned_data['docfile']
        else:
            raise forms.ValidationError('Max 2.5 MB allowed. Current size is {0}'.format(current_size))

类文档表单（…）：
...
docfile=forms.FileField（…）
...
def clean_docfile（自）：
当前大小=自清理的数据['docfile'].size
如果当前_大小<2621440#大小（字节）：
返回自清理的_数据['docfile']
其他：
raise forms.ValidationError（'允许的最大值为2.5 MB。当前大小为{0}'。格式（当前大小））

以上代码是允许的最大文件大小。如果您想要最低要求，只需颠倒

class DOcumentForm(...):
    ...
    docfile = forms.FileField(...)
    ...

    def clean_docfile(self):
        current_size = self.cleaned_data['docfile'].size
        if current_size < 2621440 # size in bytes:
            return self.cleaned_data['docfile']
        else:
            raise forms.ValidationError('Max 2.5 MB allowed. Current size is {0}'.format(current_size))