Дмитрий Темников

<script type="text/javascript">
        if (history.pushState) {
        var baseUrl = window.location.protocol + "//" + window.location.host + window.location.pathname;
        var newUrl = baseUrl + `?cat={{ cat_id_join }}{% if tag.0 != "" %}&tag={{ tagstr_param }}{% endif %}&page={{ page }}&size={{ size }}&order={{ order }}&direction={{ direction }}`;
        history.replaceState(null, null, newUrl);
             }
    </script>

<script type="text/javascript">
    function catSelect(event) {
        var cat_id = $(event.currentTarget).attr('cat_id');
        if (event.ctrlKey) {
window.location.href = "/publication/?cat={{ cat_id_join }},"  + cat_id + "{% if tag.0 != "" %}&tag={{ tagstr_param }}{% endif %}&page=1&size={{ size }}&order={{ order }}&direction={{ direction }}"
                    return;
                }
        if (event.altKey) {
window.location.href = "/publication/?cat={{ cat_id_join }},"  + cat_id + "(del){% if tag.0 != "" %}&tag={{ tagstr_param }}{% endif %}&page=1&size={{ size }}&order={{ order }}&direction={{ direction }}"
                    return;
                }      	
window.location.href = "/publication/?cat="  + cat_id + "&page=1&size={{ size }}&order={{ order }}&direction={{ direction }}"
  }
</script>

<script type="text/javascript">
        window.need_page={{ page|add:"1" }};
        window.addEventListener('scroll', function() {
        let windowRelativeBottom = document.documentElement.getBoundingClientRect().bottom;
        if (windowRelativeBottom < document.documentElement.clientHeight + 100) {
            if (window.need_load_more == 1) {
                window.need_load_more = 0;
            var myDivPaginator = document.getElementById("paginatorTop");
            var myDivContent = document.getElementById("publication_content_block");
            $.ajax({
                url: "/ajaxMorePub/?cat={{ cat_id_join }}{% if tag.0 != "" %}&tag={{ tagstr_param }}{% endif %}&page=" + window.need_page + "&size={{ size }}&order={{ order }}&direction={{ direction }}",
                success: function(response){
                  var parser = new DOMParser();
                  var ajax_html = parser.parseFromString(response, "text/html");
                  var container = ajax_html.getElementsByClassName("container")[0];
                  if (container.id != "empty") {
                          myDivContent.insertAdjacentHTML('beforeEnd', ajax_html.getElementById("pubcontent").outerHTML);
                          myDivPaginator.innerHTML = ajax_html.getElementById("paginatorTop").outerHTML;
    if (history.pushState) {
        var baseUrl = window.location.protocol + "//" + window.location.host + window.location.pathname;
        var newUrl = baseUrl + `?cat={{ cat_id_join }}{% if tag.0 != "" %}&tag={{ tagstr_param }}{% endif %}&page=` + window.need_page + `&size={{ size }}&order={{ order }}&direction={{ direction }}`;
        history.pushState(null, null, newUrl);
             }
                          window.need_page = window.need_page + 1;
                          window.need_load_more = 1;
                          }
                   else { var text_on_spinner = document.getElementById("text_on_spinner");
                          text_on_spinner.innerHTML = "Это все публикации, загляните позже или измените фильтр!!!";
                          var spinner = document.getElementById("spinner_class");
                          spinner.className="alert alert-danger";
                          return;
                          }
                     }
                  });
                };
              };
            }); </script>

from django.core.paginator import Paginator
====================================
# получаем список pub_id по параметрам
    pubidlist=get_pub_id_by_params(cat_id=set(cat_id), tag=set(tag),
                    order=order, direction=direction)
# осуществляем пагинацию
    paginator = Paginator(pubidlist, size)
    if page>paginator.num_pages:
        if template=="ajaxMorePub.html":
            return render(request, "emptypublist.html")
        page=paginator.num_pages
    pubidlist = paginator.get_page(page) 
# запрашиваем модель данных 
    pubmodel=get_pub_model(pubidlist,
        order=order, direction=direction)
====================================
    response = render(request, template, {
            'pub_sorted': pubmodel.items(),
            'order': order, 'size': size, 'direction': direction,
            'page_range': paginator.page_range,
            'num_pages': paginator.num_pages,
            'paginator': paginator.page(page),
            'page': page
        })

{% if pub_sorted|length != 0 %}
<nav aria-label="pagination">
   <ul class="pagination justify-content-center">
      <!-- Первая страница --> 
      <li class="page-item {% if page == 1 %}disabled{% endif %}"> <a class="page-link" href="/mytestblog/publication/?cat={{ cat_id_join }}{% if tag.0 != "" %}&tag={{ tagstr_param }}{% endif %}&page=1&size={{ size }}&order={{ order }}&direction={{ direction }}">Первая</a> </li>
      <!-- Если существует предыдущая страница --> {% if paginator.has_previous %} 
      <li class="page-item"> <a class="page-link" href="/mytestblog/publication/?cat={{ cat_id_join }}{% if tag.0 != "" %}&tag={{ tagstr_param }}{% endif %}&page={{ paginator.previous_page_number }}&size={{ size }}&order={{ order }}&direction={{ direction }}">«</a> </li>
      {% else %} <li class="page-item disabled"> <a class="page-link" href="#">«</a> </li>
      {% endif %} <!-- Если нет страницы +1, но есть страница -6 --> {% if page|add:"1" not in page_range and page|add:"-6" in page_range %} 
      <li class="page-item"> <a class="page-link" href="/mytestblog/publication/?cat={{ cat_id_join }}{% if tag.0 != "" %}&tag={{ tagstr_param }}{% endif %}&page={{ page|add:"-6" }}&size={{ size }}&order={{ order }}&direction={{ direction }}">{{ page|add:"-6" }}</a> </li>
      {% endif %} <!-- Если нет страницы +2, но есть страница -5 --> {% if page|add:"2" not in page_range and page|add:"-5" in page_range %} 
      <li class="page-item"> <a class="page-link" href="/mytestblog/publication/?cat={{ cat_id_join }}{% if tag.0 != "" %}&tag={{ tagstr_param }}{% endif %}&page={{ page|add:"-5" }}&size={{ size }}&order={{ order }}&direction={{ direction }}">{{ page|add:"-5" }}</a> </li>
      {% endif %} <!-- Если нет страницы +3, но есть страница -4 --> {% if page|add:"3" not in page_range and page|add:"-4" in page_range %} 
      <li class="page-item"> <a class="page-link" href="/mytestblog/publication/?cat={{ cat_id_join }}{% if tag.0 != "" %}&tag={{ tagstr_param }}{% endif %}&page={{ page|add:"-4" }}&size={{ size }}&order={{ order }}&direction={{ direction }}">{{ page|add:"-4" }}</a> </li>
      {% endif %} <!-- Если существует страница текущая - 3 --> {% if page|add:"-3" in page_range %} 
      <li class="page-item"> <a class="page-link" href="/mytestblog/publication/?cat={{ cat_id_join }}{% if tag.0 != "" %}&tag={{ tagstr_param }}{% endif %}&page={{ page|add:"-3" }}&size={{ size }}&order={{ order }}&direction={{ direction }}">{{ page|add:"-3" }}</a> </li>
      {% endif %} <!-- Если существует страница текущая - 2 --> {% if page|add:"-2" in page_range %} 
      <li class="page-item"> <a class="page-link" href="/mytestblog/publication/?cat={{ cat_id_join }}{% if tag.0 != "" %}&tag={{ tagstr_param }}{% endif %}&page={{ page|add:"-2" }}&size={{ size }}&order={{ order }}&direction={{ direction }}">{{ page|add:"-2" }}</a> </li>
      {% endif %} <!-- Если существует страница текущая - 1 --> {% if page|add:"-1" in page_range %} 
      <li class="page-item"> <a class="page-link" href="/mytestblog/publication/?cat={{ cat_id_join }}{% if tag.0 != "" %}&tag={{ tagstr_param }}{% endif %}&page={{ page|add:"-1" }}&size={{ size }}&order={{ order }}&direction={{ direction }}">{{ page|add:"-1" }}</a> </li>
      {% endif %} <!-- Текущая активная страница --> 
      <li class="page-item active"> <a class="page-link" href="#">{{ page }}</a> </li>
      <!-- Если существует страница текущая + 1 --> {% if page|add:"1" in page_range %} 
      <li class="page-item"> <a class="page-link" href="/mytestblog/publication/?cat={{ cat_id_join }}{% if tag.0 != "" %}&tag={{ tagstr_param }}{% endif %}&page={{ page|add:"1" }}&size={{ size }}&order={{ order }}&direction={{ direction }}">{{ page|add:"1" }}</a> </li>
      {% endif %} <!-- Если существует страница текущая + 2 --> {% if page|add:"2" in page_range %} 
      <li class="page-item"> <a class="page-link" href="/mytestblog/publication/?cat={{ cat_id_join }}{% if tag.0 != "" %}&tag={{ tagstr_param }}{% endif %}&page={{ page|add:"2" }}&size={{ size }}&order={{ order }}&direction={{ direction }}">{{ page|add:"2" }}</a> </li>
      {% endif %} <!-- Если существует страница текущая + 3 --> {% if page|add:"3" in page_range %} 
      <li class="page-item"> <a class="page-link" href="/mytestblog/publication/?cat={{ cat_id_join }}{% if tag.0 != "" %}&tag={{ tagstr_param }}{% endif %}&page={{ page|add:"3" }}&size={{ size }}&order={{ order }}&direction={{ direction }}">{{ page|add:"3" }}</a> </li>
      {% endif %} <!-- Если нет страницы -3, но есть страница +4 --> {% if page|add:"-3" not in page_range and page|add:"4" in page_range %} 
      <li class="page-item"> <a class="page-link" href="/mytestblog/publication/?cat={{ cat_id_join }}{% if tag.0 != "" %}&tag={{ tagstr_param }}{% endif %}&page={{ page|add:"4" }}&size={{ size }}&order={{ order }}&direction={{ direction }}">{{ page|add:"4" }}</a> </li>
      {% endif %} <!-- Если нет страницы -2, но есть страница +5 --> {% if page|add:"-2" not in page_range and page|add:"5" in page_range %} 
      <li class="page-item"> <a class="page-link" href="/mytestblog/publication/?cat={{ cat_id_join }}{% if tag.0 != "" %}&tag={{ tagstr_param }}{% endif %}&page={{ page|add:"5" }}&size={{ size }}&order={{ order }}&direction={{ direction }}">{{ page|add:"5" }}</a> </li>
      {% endif %} <!-- Если нет страницы -1, но есть страница +6 --> {% if page|add:"-1" not in page_range and page|add:"6" in page_range %} 
      <li class="page-item"> <a class="page-link" href="/mytestblog/publication/?cat={{ cat_id_join }}{% if tag.0 != "" %}&tag={{ tagstr_param }}{% endif %}&page={{ page|add:"6" }}&size={{ size }}&order={{ order }}&direction={{ direction }}">{{ page|add:"6" }}</a> </li>
      {% endif %} <!-- Если существует следующая страница --> {% if paginator.has_next %} 
      <li class="page-item"> <a class="page-link" href="/mytestblog/publication/?cat={{ cat_id_join }}{% if tag.0 != "" %}&tag={{ tagstr_param }}{% endif %}&page={{ paginator.next_page_number }}&size={{ size }}&order={{ order }}&direction={{ direction }}">»</a> </li>
      {% else %} 
      <li class="page-item disabled"> <a class="page-link" href="#">»</a> </li>
      {% endif %} <!-- Последняя страница --> 
      <li class="page-item {% if page == num_pages %}disabled{% endif %}"> <a class="page-link" href="/mytestblog/publication/?cat={{ cat_id_join }}{% if tag.0 != "" %}&tag={{ tagstr_param }}{% endif %}&page={{ num_pages }}&size={{ size }}&order={{ order }}&direction={{ direction }}">Последняя</a> </li>
   </ul>
</nav>
{% endif %}