Как сделать аякс-подгрузку контента для InstantCMS 1.10.6

$inDB->limitPage($page, $model->config['perpage']);

if(isset($_POST['ajax_page'])) {
    $page = $_POST['ajax_page'];
    $perpage = $model->config['perpage'];
    $inDB->limitPage($page, $perpage);
}

 
$(document).ready(function() {
  if ($('.contentlist').length && $('.pagebar').length) {
    window.counter = 1;
    var allPages = $('.pagebar > *').last().attr('href').split('-');
    var maxPage = allPages[allPages.length-1];
    $(document).on('click', '.load_more_btn', function() {
      window.counter++;
      if (window.counter <= maxPage) {
        $.ajax({
            url: window.location.pathname,
            data: {ajax_page:window.counter},
            type: "POST",
            success: function(data) 
            {   
              var filterData = $(data).filter('table.contentlist').find('tbody').html();
              $('.component table.contentlist tbody').append(filterData);
            },
            complete: function() {
              if (window.counter == maxPage-1) {
                $('body').addClass('ajax-before-last-page');
              }
            }
        });
      }
    });
    $(document).on('click', 'body.ajax-before-last-page .load_more_btn', function() {
      setTimeout(function () {
        $('.load_more_btn').hide();
        $('body').removeClass('ajax-before-last-page');
      }, 200);
    });
  }
});
 

 
<span class="load_more_btn">Загрузить ещё</span>
 

{$pagebar}

<div style="display: none;">{$pagebar}</div>

 
        .load_more_btn {
            display: table;
            font-size: 21px;
            color: #fff !important;
            text-decoration: none !important;
            padding: 12px 40px;
            line-height: 1;
            overflow: hidden;
            position: relative;
            box-shadow: 0 1px 1px #ccc;
            border-radius: 2px;
            background-color: #51b7e6;
            background-image: -webkit-linear-gradient(top, #51b7e6, #4dafdd);
            background-image: -moz-linear-gradient(top, #51b7e6, #4dafdd);
            background-image: linear-gradient(top, #51b7e6, #4dafdd);
            border: 1px solid #51b7e6;
            margin: 20px auto 10px;
            -webkit-transition-duration: 0.4s;
            -o-transition-duration: 0.4s;
            transition-duration: 0.4s;
            cursor: pointer;
        }
        .load_more_btn:hover {
            opacity: 0.7;
        }
        .load_more_btn:active {
            opacity: 0.85;
        }