csv-library-website/library/templates/menu.html

{% block menu %}
<button id="leftmostbtn" onclick="filterSelection('all')">All books</button>
<button><a href="/upload">Upload</a></button>
<div class="dropdown">
  <button class="dropbtn">Type</button>
   <div class="dropdown-content">
     {% for pubtype in pubtypes %}
     	<button type="button" name="button" onclick="filterSelection('{{ pubtype }}')" >{{ pubtype.title() }}</button>
     {% endfor %}
   </div>
 </div>
 <div class="dropdown">
   <button class="dropbtn">Year</button>
    <div class="dropdown-content">
      {% for pubyear in pubyears %}
      	<button type="button" name="button" onclick="filterSelection('{{ pubyear }}')" >{{ pubyear }}</button>
      {% endfor %}
    </div>
  </div>
  <div class="dropdown">
    <button class="dropbtn">License</button>
     <div class="dropdown-content">
       {% for publicense in publicenses %}
         <button type="button" name="button" onclick="filterSelection('{{ publicense }}')" >{{ publicense }}</button>
       {% endfor %}
     </div>
   </div>
{% endblock menu %}