Add Infinite Scroll to Tumblr's Stationary theme

infinite_scroll.js

(function($) {    

    function bindScroll() {
      $(window).scroll(function(){
          var threshold = 0.8 * ($(document).height() - $(window).height());
          if ($(window).scrollTop() >= threshold){
            $(window).unbind('scroll');
            getNextPage();
          }
      });
    }

    function getNextPage() {
      this.currentPage = this.currentPage ? ++this.currentPage : 2;
      $.ajax({
        url: '/page/' + this.currentPage,
        type: 'GET',
        dataType: 'html',
        success: function(data, status, xhr) {
          var output = "", query = "?";
          $($(data)).find('article').each(function(index, article) {
            output += $('<div>').append($(article).clone()).remove().html();
          });
          $('#stat-articles').append(output);
          bindScroll();
        }
      });
    }
  
    $('#stat-navigation').hide();
    var allowedUrls = [ 
      'http://blog.amarnus.me', 
      'http://blog.amarnus.me/', 
      'http://blog.amarnus.me/page/1'
    ];
    for (var index in allowedUrls) {
      if (window.location.href == allowedUrls[index]) {
        bindScroll();
      }
    }

})(jQuery);