gistfile1.txt

<script>
  (function () {
    function init() {
      if (!window.jQuery) return;
      var $ = window.jQuery;
      var $btn = $('.js-load-cards');
      var baseNextUrl = $('link[rel="next"]').attr('href');

      if (!$btn.length || !baseNextUrl) return;

      function decodeHtml(str) {
        return $('<textarea/>').html(str || '').text();
      }

      function buildNextPageUrl(urlString, pageNumber) {
        try {
          var url = new URL(String(urlString), window.location.origin);
          if (/\/page\/\d+\/?$/.test(url.pathname)) {
            url.pathname = url.pathname.replace(/\/page\/\d+\/?$/, '/page/' + pageNumber + '/');
          } else {
            url.pathname = url.pathname.replace(/\/$/, '') + '/page/' + pageNumber + '/';
          }
          return url.toString();
        } catch (e) {
          var raw = String(urlString || '');
          if (/\/page\/\d+\/?$/.test(raw)) {
            return raw.replace(/\/page\/\d+\/?$/, '/page/' + pageNumber + '/');
          }
          return raw.replace(/\/$/, '') + '/page/' + pageNumber + '/';
        }
      }

      var nextPageNumber = Number(window.pagination_next_page_number || 2);
      var availablePages = Number(window.pagination_available_pages_number || 1);

      $btn.off('click').on('click', function (e) {
        e.preventDefault();
        e.stopImmediatePropagation();

        var requestUrl = buildNextPageUrl(baseNextUrl, nextPageNumber);

        $.ajax({
          url: requestUrl,
          beforeSend: function () {
            $btn.text(decodeHtml(window.pagination_loading_text));
            $btn.addClass('c-btn--loading');
          }
        }).done(function (data) {
          var $posts = $('.js-card', data);
          $('.js-grid').append($posts);

          $btn.text(decodeHtml(window.pagination_more_posts_text));
          $btn.removeClass('c-btn--loading');

          nextPageNumber += 1;
          window.pagination_next_page_number = nextPageNumber;

          if (nextPageNumber > availablePages) {
            $btn.addClass('c-btn--disabled').attr('disabled', true);
          }
        }).fail(function () {
          $btn.text(decodeHtml(window.pagination_more_posts_text));
          $btn.removeClass('c-btn--loading');
        });
      });
    }

    if (document.readyState === 'loading') {
      document.addEventListener('DOMContentLoaded', init);
    } else {
      init();
    }
  })();
  </script>