如何清除表单但仍显示其字段之一？

Question

我想提交一个表单 F，清除它的字段，但仍然显示它的一个字段。 F 提交到一个视图，该视图呈现最先显示它的模板

为此，我 return 一个 HttpResponseRedirect 对象，而不是使用请求呈现模板：

def home(request):

    if request.method == 'POST':
        form = New_mini_url_form(request.POST)
        if form.is_valid():
            if (MiniUrl.objects.filter(url=form.cleaned_data['url']).count() == 0):
                code = form.cleaned_data['code']
                request.session["code"] = code
                [... stuff ...]

                return HttpResponseRedirect(reverse(home))

            else:
                code = form.cleaned_data['code']
                request.session["code"] = code
                [... stuff ...]

                return HttpResponseRedirect(reverse(home))
        else:
            return render(request, 'mini_url/home.html', locals())

    else:
        form = New_mini_url_form()
        return render(request, 'mini_url/home.html', locals())

我的模板中有 {{ request.session.code}}

这里是 project/settings.py

的摘录

TEMPLATE_CONTEXT_PROCESSORS = (
    "django.contrib.auth.context_processors.auth",
    "django.core.context_processors.debug",
    "django.core.context_processors.i18n",
    "django.core.context_processors.media",
    "django.core.context_processors.static",
    "django.core.context_processors.tz",
    "django.contrib.messages.context_processors.messages",
    "django.core.context_processors.request"
)

谢谢！

Answer 1

您可以在会话中设置 code 变量。然后在您的模板中使用 request.session.code 访问它。

def home(request):

    if request.method == 'POST':
        form = New_mini_url_form(request.POST)
        if form.is_valid():
            if (MiniUrl.objects.filter(url=form.cleaned_data['url']).count() == 0):
                code = form.cleaned_data['code']
                request.session['code'] = code # set code in the session
                [... stuff ...]

                return HttpResponseRedirect(reverse(home))

            else:
                code = form.cleaned_data['code']
                request.session['code'] = code # set code in the session
                [... stuff ...]

                return HttpResponseRedirect(reverse(home))
        else:
            return render(request, 'mini_url/home.html', locals())

    else:
        form = New_mini_url_form()
        return render(request, 'mini_url/home.html', locals())

然后在您的模板中，您可以通过以下方式访问 code：

{{request.session.code}} # display code in the template

您必须在设置中包含 django.core.context_processors.request。

TEMPLATE_CONTEXT_PROCESSORS = (
  ...
  'django.core.context_processors.request', # will pass request in the template
  ...
)

来自 request context processor 上的 Django 1.7 文档：

django.core.context_processors.request

If TEMPLATE_CONTEXT_PROCESSORS contains this processor, every RequestContext will contain a variable request, which is the current HttpRequest. Note that this processor is not enabled by default; you’ll have to activate it.

如何清除表单但仍显示其字段之一？

How to clear a form but still display one of its fields?

python

django

django-forms

httpresponse