Feed when change the value

change_select_feed.js

  $('#id_job_department').change(function(event) {
    var department_pk = $(this).val()
    url =  "{% url 'json_sub_department' %}"

    if ($(this).children('option:first-child').is(':selected')) {
     $('#id_job_sub_department').children('option:not(:first)').remove();
   }else{
     $.ajax({
       dataType:'json',
       data: {'pk': department_pk},
       url: url,
       success: function(data){
         $('#id_job_sub_department').children('option:not(:first)').remove();
         $.each(data, function(index, value) {
           $('#id_job_sub_department').append($('<option>',{ value: index, text : value}));
         });
       }
     });

   }// else
    return false;
  });

select.html

  <div class="col-sm-6">
              <div class="form-group">
                <label class='text-muted'>
                  {% trans "Depto" %}
                </label>
                <p>
                  <small>{% trans "Se sim, selecione uma opção" %}</small>
                </p>
                <select class="form-control" id="id_job_department" name="job_department">
                  <option value="">{% trans "Escolher" %}</option>
                  {% for department in department_list %}
                    <option value="{{ department.pk }}">{{ department|title }}</option>
                  {% endfor %}
                </select>
               </div>
            </div><!-- end col -->

            <div class="col-sm-6">
              <div class="form-group">
                <label class='text-muted'>
                  {% trans "Sub Depto" %}
                </label>
                <p>
                  <small>{% trans "Se sim, selecione uma opção" %}</small>
                </p>
                <select class="form-control" id="id_job_sub_department" name="job_sub_department">
                  <option value="">{% trans "Escolher" %}</option>
                </select>
              </div>
            </div><!-- end col -->
          </div><!-- end row -->

url.py

url(r'dashboard/jobcombo/availablesubdepartment/$', views.json_sub_department , name='json_sub_department'),

views.py

def json_sub_department(request):
    pk =  request.GET.get('pk')
    data = {}
    if pk:
        sub_deparments = SubDepartment.objects.filter(department__pk=pk)
        for sub in sub_deparments:
            text = getattr(sub, 'sub_department')
            data[sub.pk] = text.title()

    return JsonResponse(data)