Infinite pager without infinitescroll.js [Drupal] [Apache solr page] Ref : https://www.drupal.org/node/1473558#comment-8597229

infinitescrollajax.js

/**
 * Js file to add load more button on the search result page.
 */

(function ($) {
  Drupal.behaviors.loadMoreAjax = {
    attach: function (context, settings) {
      $('.load-more-ajax', context).click(function () {
        var nextPage = $('.pager .pager__item--next a').attr('href');
        var lastPage = $('.pager .pager__item--last a').attr('href');
        $.get(nextPage, function (data) {
          $(data).find('.apachesolr_search-results').insertBefore($('.pager'));
          $('.pager').remove();
          if (nextPage == lastPage) {
            $('.load-more-ajax').remove();
          }
          else {
            $(data).find('.pager').appendTo($('.pager'));
            Drupal.attachBehaviors($('.apachesolr_search-results'));
          }
        });
      });
      $('.pane-apachesolr-result .pager').hide();
    }
  };
})(jQuery);