#home.html

<!--Timeline header area start -->
<form action="." method="post" name="category_form">
  {% csrf_token %}
  <div class="post-list-header">
    <span class="post-list-title">Latest stories</span>
    <select class="frm-input" name="category_name" id="category_name">
      <option value="dummy">select category</option>
      {% for cat in categories %}
        <option value="{{cat.slug}}">{{cat.name}}</option>
      {% endfor %}
    </select>
  </div>
</form>
!--Timeline header area end -->

<script>
	  $(document).ready(function(){
		$("#category_name").change(function(){
			this.form.submit();
    		});
	   });
  </script>



  views.py
  def home(request):
    if request.POST:
        print (request.POST['category_name'])
        posts = Model.objects.filter(category=Category.objects.get(slug=request.POST['category_name']))
        request.session['category_name'] = request.POST['category_name']