'adding active class in django according to anchor in url

I want to create one page site with navbar links which redirect to some part of the page. How add class "active" to a link if url is based on anchor (#)?

<div class="navbar-collapse collapse">
  <ul class="nav navbar-nav navbar-right">
    <li {% if request.path == "/" %} class="active"{% endif %}>
      <a href="{% url "index" %}">Main pge</a>
    </li>
    <li {% if 'about_us' in request.path %} class="active"{% endif %}>
      <a href="#about_us">About us</a>
    </li>
    <li><a href="#services">Services</a></li>
    <li><a href="#contacts">Contacts</a></li>
  </ul>
</div>


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