Question

关于问题： - 我有一个名为topics的表单字段，其中包含manytomanyfield。现在在模板中，我在字段集内的div中调用{{form.topics}}。我想检查{{form.topics}}是否为空或其长度是＆lt; = 1，在这种情况下我不想显示{{form.topics}}的字段集这是我的代码。我正在使用jquery解决这个问题。

 forms.py  
 # Showing only that field to keep code short 
    class VisitSetupForm(Form):
    topics = ModelMultipleChoiceField(
                    queryset=Topic.objects.filter(reporting=False),
                    widget=CheckboxSelectMultiple,
                    required=False
                )

    Views.py
    def setup(request):
        if request.user.is_superuser:
            form_class = AdminVisitSetupForm
            all_topics = True
        else:
            form_class = VisitSetupForm
            all_topics = False

        f = form_class(request, data=request.POST or None)
        if request.method == "POST":
            if f.is_valid():
                ......so on ....
                if request.user.is_superuser:
                    topics = cd['topics']
                else:
                    topics = set(list(interview.topics.all()) + list(cd['topics']))
            next_url = "/visit/confirmation/%s/%s/?next=%s" % (patient.user.id, interview.id, url)
            return HttpResponseRedirect(next_url)
    if not all_topics:

       user = get_user(request)
       # checking here if the topics exists for other user
       f.fields['topics'].queryset = user.organization.topics
       f.fields['interview'].queryset = user.organization.interviews

       data['form'] = f
     return render_to_response('visit/setup.html', data, context_instance=RequestContext(request))   

    .html
    # calling in html
    <fieldset class="step4">
            <legend>Step 4 - Topic selection</legend>
            <p>Check off any additional topics you want to add to the interview. If you want to
            remove a topic from an interview, uncheck it.</p>
            <div>{{ form.topics }}</div>
        </fieldset>
        <script>
            if($(".step4 input:checkbox").length <= 0)
            {
                $(".step4").hide();
            }
        </script>

{{form.topics}}是复选框列表。我希望没有复选框时（{{form.topics is empty}}）不显示字段集这是通过jquery实现的。我希望像{{form.topics.empty}}这样的东西不显示 step4字段集。有没有什么好方法可以删除那个jquery。

提前致谢..

Answer 1

我建议你计算变量的长度

forms.topics

在您的视图中

，只需在模板中使用此变量

即可

{% if not forms.topic or variable <= 1 %}
    <td>Whatever you want to display</td>
{% else %}
    <td> {{ forms.topic }} </td>
{% endif %}

此代码检查“forms.topic”中是否没有值，或者变量的长度（在视图中计算的）小于或等于1.打印要显示的文本。

检查模板中的表单字段是否为空

1 个答案: