AJAX content replace

update_content.js

(function($) {
  // scan our ajax response for replaceable content blocks then update the HTML
  var updateContent = function(content) {
    var $contentKeyElements = $(content).filter('[data-content-key]');
    $contentKeyElements.each(function() {
      var node = $(this);
      var key = node.attr('data-content-key');
      $('[data-content-key=' + key + ']').replaceWith(node);
    });

    $(document).trigger('content-updated');
  };

  $(function() {
    $(document).bind('ajax:success', function(e, content) {
      $.each(content, function(key, value) {
        updateContent(value);
      });
    });
  });
})(jQuery);