Django 1.6：一个表单中的两个下拉菜单不起作用

Question

我在一个模板里有两个下拉菜单，它们都使用同一个表单。但是不知道为什么，只有一个表单能正常工作，另一个在视图中给我报了个错误，叫做 MultiValueDictKeyError。这个错误出现在这一行：request.session["genderselect"] = request.POST['genderselect']

所以我把相关的代码注释掉，看看会发生什么，结果代码能正常运行，显示了第一个下拉菜单（名字是 selection）。但是第二个下拉菜单（名字是 genderselect）却不工作，尽管它们都是同一个表单的一部分。

views.py

def doclistings(request):
    d = getVariables(request)
    if request.method == "POST":
        form = DropdownSelectionForm(request.POST)

        if form.is_valid():
            print form.errors
            selection = form.cleaned_data['selection']
            # genderselect = form.cleaned_data['genderselect']
            # request.session["genderselect"] = request.POST['genderselect']
            request.session["selection"] = request.POST['selection']

            return HttpResponseRedirect('/doclistings')
    else:
        form = DropdownSelectionForm()

    # d['genderselect'] = genderselect
    s_name = request.session.get('selection')  
    d['userselection'] = s_name  
    spec = Specialization.objects.get(name=s_name) 
    doctors = Doctor.objects.filter(specialization = spec).order_by('-likes')  
    d['doctors'] = doctors

    d.update({'form': form})
    return render_to_response('meddy1/doclistings.html',d)

forms.py

class DropdownSelectionForm(forms.Form):
    selection = forms.ChoiceField(choices=MY_CHOICES, widget = forms.Select, required = False)
    genderselect = forms.ChoiceField(choices=GENDER_CHOICES, widget= forms.Select, required = False)

这是我有两个下拉菜单的模板

    <select class="form-control" id="selection" name="selection">
      <option><b>Find a Doctor...</b></option>
      {% for value, text in form.selection.field.choices %}
        <option value="{{ value }}">{{ text }}</option>
      {% endfor %}
    </select>

      <select class="form-control" id="genderdropdown" name="genderdropdown">
      <option><b>Select a Gender</b></option>
      {% for value, text in form.genderselect.field.choices %}
        <option value="{{ value }}">{{ text }}</option>
      {% endfor %}
    </select>

    <span class="input-group-btn">
      <button class="btn btn-primary" type="submit"  name="submit" id="ss-submit">Search</button>
    </span>
  </div>
  {% csrf_token %}

</form>

Answer 1

你应该把 name="genderdropdown" 这个属性改成和表单字段的名字一致。

换句话说，把 name="genderdropdown" 替换成 name="genderselect"。