认为**renders**是

def codequestion(request, question_id):
    question = Question.objects.get(pk=question_id)
    return render(request, 'polls/codequestion.html', {'question': question})

提交时调用的视图是

def codequestion_evaluate(request, question_id):
    form = CodeForm()
    print request.method
    if request.method == 'POST':
        form = CodeForm(request.POST)
        if form.is_valid():
            data = form.cleaned_data        
            return HttpResponse("Your code is  %s" % data['solution'])
        else:
            return HttpResponse("not valid")    
   else:
        return HttpResponse("Error")

类

from django import forms

class CodeForm(forms.Form):
    solution = forms.CharField(widget=forms.Textarea)

模板

<form action="{% url 'codequestion_evaluate' question.id %}" method="post">
{% csrf_token %}
{{form.as_p}}   
<input type="submit" value="Submit" />
</form>

我没有在HTML页面中显示表单字段，我只能看到“提交”按钮。

解决方案

假定显示未填写表单的视图根本不会创建表单对象。它应该创建一个表单对象，并将其传递给模板，如下所示：

def codequestion(request, question_id):
    question = Question.objects.get(pk=question_id)
    form = CodeForm()
    return render(request, 'polls/codequestion.html', {'question': question, 'form': form})

但是更好的是，您应该遵循Django文档中描述的模式。为此，您应该：

1. 删除codequestion。所有操作（显示未填写的表单，显示有错误的提交表单，处理正确提交的表单）将由单个视图处理。

2. 配置您的网址路由，以便codequestion_evaluate视图处理显示未填写表格的页面。

3. 进行更改codequestion_evaluate，使其遵循以下模式：

   def codequestion_evaluate(request, question_id):
       if request.method == 'POST':
           form = CodeForm(request.POST)
           if form.is_valid():
               # The form has been submitted and is valid
               # process the data and redirect to a "thank you" page
               data = form.cleaned_data
               return HttpResponseRedirect('/thanks/')
           else:
               # just display an empty form
               form = CodeForm()
       # you can optionally add 'question' if you need it in your template
       question = Question.objects.get(pk=question_id)
       return render(request, 'polls/codequestion.html', {'form': form, 'question': question})