(function($) {

Drupal.behaviors.HierarchicalSelect = {
  attach: function (context) {
    $('.hierarchical-select-wrapper:not(.hierarchical-select-wrapper-processed)', context)
    .addClass('hierarchical-select-wrapper-processed').each(function() {
      var hsid = $(this).attr('id').replace(/^hierarchical-select-(.+)-wrapper$/, "$1");
      Drupal.HierarchicalSelect.initialize(hsid);
    });
  }
};

Drupal.HierarchicalSelect = {};

Drupal.HierarchicalSelect.state = [];

Drupal.HierarchicalSelect.context = function() {
  return $("form .hierarchical-select-wrapper");
};

Drupal.HierarchicalSelect.initialize = function(hsid) {
  // Prevent JS errors when Hierarchical Select is loaded dynamically.
  if (undefined == Drupal.settings.HierarchicalSelect || undefined == Drupal.settings.HierarchicalSelect.settings["hs-" + hsid]) {
    return false;
  }

  // If you set Drupal.settings.HierarchicalSelect.pretendNoJS to *anything*,
  // and as such, Hierarchical Select won't initialize its Javascript! It
  // will seem as if your browser had Javascript disabled.
  if (undefined != Drupal.settings.HierarchicalSelect.pretendNoJS) {
    return false;
  }

  var form = $('#hierarchical-select-'+ hsid +'-wrapper').parents('form');

  // Pressing the 'enter' key on a form that contains an HS widget, depending
  // on which browser, usually causes the first submit button to be pressed
  // (likely an HS button).  This results in unpredictable behaviour.  There is
  // no way to determine the 'real' submit button, so disable the enter key.
  form.find('input').keypress(function(event) {
    if (event.keyCode == 13) {
      event.preventDefault();
      return false;
    }
  });

  // Turn off Firefox' autocomplete feature. This causes Hierarchical Select
  // form items to be disabled after a hard refresh.
  // See http://drupal.org/node/453048 and
  // http://www.ryancramer.com/journal/entries/radio_buttons_firefox/
  if (navigator.userAgent.toLowerCase().indexOf('firefox') > -1) {
    form.attr('autocomplete', 'off');
  }

  // Enable *all* submit buttons in this form, as well as all input-related
  // elements of the current hierarchical select, in case we reloaded while
  // they were disabled.
  form.add('#hierarchical-select-' + hsid +'-wrapper .hierarchical-select .selects select')
      .add('#hierarchical-select-' + hsid +'-wrapper .hierarchical-select input')
      .attr('disabled', false);

  if (this.cache != null) {
    this.cache.initialize();
  }

  Drupal.settings.HierarchicalSelect.settings["hs-" + hsid]['updatesEnabled'] = true;
  if (undefined == Drupal.HierarchicalSelect.state["hs-" + hsid]) {
    Drupal.HierarchicalSelect.state["hs-" + hsid] = {};
  }

  this.transform(hsid);
  if (Drupal.settings.HierarchicalSelect.settings["hs-" + hsid].resizable) {
    this.resizable(hsid);
  }
  Drupal.HierarchicalSelect.attachBindings(hsid);

  if (this.cache != null && this.cache.status()) {
    this.cache.load(hsid);
  }

  Drupal.HierarchicalSelect.log(hsid);
};

Drupal.HierarchicalSelect.log = function(hsid, messages) {
  // Only perform logging if logging is enabled.
  if (Drupal.settings.HierarchicalSelect.initialLog == undefined || Drupal.settings.HierarchicalSelect.initialLog["hs-" + hsid] == undefined) {
    return;
  }
  else {
    Drupal.HierarchicalSelect.state["hs-" + hsid].log = [];
  }

  // Store the log messages. The first call to this function may not contain a
  // message: the initial log included in the initial HTML rendering should be
  // used instead..
  if (Drupal.HierarchicalSelect.state["hs-" + hsid].log.length == 0) {
    Drupal.HierarchicalSelect.state["hs-" + hsid].log.push(Drupal.settings.HierarchicalSelect.initialLog["hs-" + hsid]);
  }
  else {
      Drupal.HierarchicalSelect.state["hs-" + hsid].log.push(messages);
  }

  // Print the log messages.
  console.log("HIERARCHICAL SELECT " + hsid);
  var logIndex = Drupal.HierarchicalSelect.state["hs-" + hsid].log.length - 1;
  for (var i = 0; i < Drupal.HierarchicalSelect.state["hs-" + hsid].log[logIndex].length; i++) {
    console.log(Drupal.HierarchicalSelect.state["hs-" + hsid].log[logIndex][i]);
  }
  console.log(' ');
};

Drupal.HierarchicalSelect.transform = function(hsid) {
  var removeString = $('#hierarchical-select-'+ hsid +'-wrapper .dropbox .dropbox-remove:first', Drupal.HierarchicalSelect.context).text();

  $('#hierarchical-select-'+ hsid +'-wrapper', Drupal.HierarchicalSelect.context)
  // Remove the .nojs div.
  .find('.nojs').hide().end()
  // Find all .dropbox-remove cells in the dropbox table.
  .find('.dropbox .dropbox-remove')
  // Hide the children of these table cells. We're not removing them because
  // we want to continue to use the "Remove" checkboxes.
  .find('*').css('display', 'none').end() // We can't use .hide() because of collapse.js: http://drupal.org/node/351458#comment-1258303.
  // Put a "Remove" link there instead.
  .append('<a href="">'+ removeString +'</a>');
};

Drupal.HierarchicalSelect.resizable = function(hsid) {
  var $selectsWrapper = $('#hierarchical-select-' + hsid + '-wrapper .hierarchical-select .selects', Drupal.HierarchicalSelect.context);

  // No select wrapper present: the user is creating a new item.
  if ($selectsWrapper.length == 0) {
    return;
  }

  // Append the drag handle ("grippie").
  $selectsWrapper.append($('<div class="grippie"></div>'));

  // jQuery object that contains all selects in the hierarchical select, to
  // speed up DOM manipulation during dragging.
  var $selects = $selectsWrapper.find('select');

  var defaultPadding = parseInt($selects.slice(0, 1).css('padding-top').replace(/^(\d+)px$/, "$1")) + parseInt($selects.slice(0, 1).css('padding-bottom').replace(/^(\d+)px$/, "$1"));
  var defaultHeight = Drupal.HierarchicalSelect.state["hs-" + hsid].defaultHeight = $selects.slice(0, 1).height() + defaultPadding;
  var defaultSize = Drupal.HierarchicalSelect.state["hs-" + hsid].defaultSize = $selects.slice(0, 1).attr('size');
  defaultSize = (defaultSize == 0) ? 1 : defaultSize;
  var margin = Drupal.HierarchicalSelect.state["hs-" + hsid].margin = parseInt($selects.slice(0, 1).css('margin-bottom').replace(/^(\d+)px$/, "$1"));

  // Bind the drag event.
  $('.grippie', $selectsWrapper)
  .mousedown(startDrag)
  .dblclick(function() {
    if (Drupal.HierarchicalSelect.state["hs-" + hsid].resizedHeight == undefined) {
      Drupal.HierarchicalSelect.state["hs-" + hsid].resizedHeight = defaultHeight;
    }
    var resizedHeight = Drupal.HierarchicalSelect.state["hs-" + hsid].resizedHeight = (Drupal.HierarchicalSelect.state["hs-" + hsid].resizedHeight > defaultHeight + 2) ? defaultHeight : 4.6 / defaultSize * defaultHeight;
    Drupal.HierarchicalSelect.resize($selects, defaultHeight, resizedHeight, defaultSize, margin);
  });

  function startDrag(e) {
    staticOffset = $selects.slice(0, 1).height() - e.pageY;
    $selects.css('opacity', 0.25);
    $(document).mousemove(performDrag).mouseup(endDrag);
    return false;
  }

  function performDrag(e) {
    var resizedHeight = staticOffset + e.pageY;
    Drupal.HierarchicalSelect.resize($selects, defaultHeight, resizedHeight, defaultSize, margin);
    return false;
  }

  function endDrag(e) {
    var height = $selects.slice(0, 1).height();

    $(document).unbind("mousemove", performDrag).unbind("mouseup", endDrag);
    $selects.css('opacity', 1);
    if (height != Drupal.HierarchicalSelect.state["hs-" + hsid].resizedHeight) {
      Drupal.HierarchicalSelect.state["hs-" + hsid].resizedHeight = (height > defaultHeight) ? height : defaultHeight;
    }
  }
};

Drupal.HierarchicalSelect.resize = function($selects, defaultHeight, resizedHeight, defaultSize, margin) {
  if (resizedHeight == undefined) {
    resizedHeight = defaultHeight;
  }

  $selects
  .attr('size', (resizedHeight > defaultHeight) ? 2 : defaultSize)
  .height(Math.max(defaultHeight + margin, resizedHeight)); // Without the margin component, the height() method would allow the select to be sized to low: defaultHeight - margin.
};

Drupal.HierarchicalSelect.disableForm = function(hsid) {
  // Disable *all* submit buttons in this form, as well as all input-related
  // elements of the current hierarchical select.
  $('form:has(#hierarchical-select-' + hsid +'-wrapper) :submit')
  .add('#hierarchical-select-' + hsid +'-wrapper .hierarchical-select .selects select')
  .add('#hierarchical-select-' + hsid +'-wrapper .hierarchical-select :input')
  .attr('disabled', true);

  // Add the 'waiting' class. Default style: make everything transparent.
  $('#hierarchical-select-' + hsid +'-wrapper').addClass('waiting');

  // Indicate that the user has to wait.
  $('body').css('cursor', 'wait');
};

Drupal.HierarchicalSelect.enableForm = function(hsid) {
  // This method undoes everything the disableForm() method did.

  $e = $('form:has(#hierarchical-select-' + hsid +'-wrapper) :submit')
  .add('#hierarchical-select-' + hsid +'-wrapper .hierarchical-select :input:not(:submit)');

  // Don't enable the selects again if they've been disabled because the
  // dropbox limit was exceeded.
  dropboxLimitExceeded = $('#hierarchical-select-' + hsid +'-wrapper .hierarchical-select-dropbox-limit-warning').length > 0;
  if (!dropboxLimitExceeded) {
    $e = $e.add($('#hierarchical-select-' + hsid +'-wrapper .hierarchical-select .selects select'));
  }
  $e.removeAttr("disabled");

  // Don't enable the 'Add' button again if it's been disabled because the
  // dropbox limit was exceeded.
  if (dropboxLimitExceeded) {
    $('#hierarchical-select-' + hsid +'-wrapper .hierarchical-select :submit')
    .attr('disabled', true);
  }

  $('#hierarchical-select-' + hsid +'-wrapper').removeClass('waiting');

  $('body').css('cursor', 'auto');
};

Drupal.HierarchicalSelect.throwError = function(hsid, message) {
  // Show the error to the user.
  alert(message);

  // Log the error.
  Drupal.HierarchicalSelect.log(hsid, [ message ]);

  // Re-enable the form to allow the user to retry, but reset the selection to
  // the level label if possible, otherwise the "<none>" option if possible.
  var $select = $('#hierarchical-select-' + hsid +'-wrapper .hierarchical-select .selects select:first');
  var levelLabelOption = $('option[value^=label_]', $select).val();
  if (levelLabelOption !== undefined) {
    $select.val(levelLabelOption);
  }
  else {
    var noneOption = $('option[value=none]', $select).val();
    if (noneOption !== undefined) {
      $select.val(noneOption);
    }
  }
  Drupal.HierarchicalSelect.enableForm(hsid);
};

Drupal.HierarchicalSelect.prepareGETSubmit = function(hsid) {
  // Remove the name attributes of all form elements that end up in GET,
  // except for the "flat select" form element.
  $('#hierarchical-select-'+ hsid +'-wrapper', Drupal.HierarchicalSelect.context)
  .find('input, select')
  .not('.flat-select')
  .removeAttr('name');

  // Update the name attribute of the "flat select" form element
  var $flatSelect = $('#hierarchical-select-'+ hsid +'-wrapper .flat-select', Drupal.HierarchicalSelect.context);
  var newName = $flatSelect.attr('name').replace(/^([a-zA-Z0-9_\-]*)(?:\[flat_select\]){1}(\[\])?$/, "$1$2");
  $flatSelect.attr('name', newName);

  Drupal.HierarchicalSelect.triggerEvents(hsid, 'prepared-GET-submit', {});
};

Drupal.HierarchicalSelect.attachBindings = function(hsid) {
  var updateOpString = $('#hierarchical-select-'+ hsid +'-wrapper .update-button').val();
  var addOpString = $('#hierarchical-select-'+ hsid +'-wrapper .hierarchical-select .add-to-dropbox', Drupal.HierarchicalSelect.context).val();
  var createNewItemOpString = $('#hierarchical-select-'+ hsid +'-wrapper .hierarchical-select .create-new-item-create', Drupal.HierarchicalSelect.context).val();
  var cancelNewItemOpString = $('#hierarchical-select-'+ hsid +'-wrapper .hierarchical-select .create-new-item-cancel', Drupal.HierarchicalSelect.context).val();

  var data = {};
  data.hsid = hsid;

  $('#hierarchical-select-'+ hsid +'-wrapper', this.context)
  // "disable-updates" event
  .unbind('disable-updates').bind('disable-updates', data, function(e) {
    Drupal.settings.HierarchicalSelect.settings["hs-" + e.data.hsid]['updatesEnabled'] = false;
  })

  // "enforce-update" event
  .unbind('enforce-update').bind('enforce-update', data, function(e, extraPost) {
     Drupal.HierarchicalSelect.update(e.data.hsid, 'enforced-update', { opString: updateOpString, extraPost: extraPost });
  })

  // "prepare-GET-submit" event
  .unbind('prepare-GET-submit').bind('prepare-GET-submit', data, function(e) {
    Drupal.HierarchicalSelect.prepareGETSubmit(e.data.hsid);
  })

  // "update-hierarchical-select" event
  .find('.hierarchical-select .selects select').unbind().change(function(_hsid) {
    return function() {
      if (Drupal.settings.HierarchicalSelect.settings["hs-" + _hsid]['updatesEnabled']) {
        Drupal.HierarchicalSelect.update(_hsid, 'update-hierarchical-select', { opString: updateOpString, select_id : $(this).attr('id') });
      }
    };
  }(hsid)).end()

  // "create-new-item" event
  .find('.hierarchical-select .create-new-item .create-new-item-create').unbind().click(function(_hsid) {
    return function() {
      Drupal.HierarchicalSelect.update(_hsid, 'create-new-item', { opString : createNewItemOpString });
      return false; // Prevent the browser from POSTing the page.
    };
  }(hsid)).end()

  // "cancel-new-item" event"
  .find('.hierarchical-select .create-new-item .create-new-item-cancel').unbind().click(function(_hsid) {
    return function() {
      Drupal.HierarchicalSelect.update(_hsid, 'cancel-new-item', { opString : cancelNewItemOpString });
      return false; // Prevent the browser from POSTing the page (in case of the "Cancel" button).
    };
  }(hsid)).end()

  // "add-to-dropbox" event
  .find('.hierarchical-select .add-to-dropbox').unbind().click(function(_hsid) {
    return function() {
      Drupal.HierarchicalSelect.update(_hsid, 'add-to-dropbox', { opString : addOpString });
      return false; // Prevent the browser from POSTing the page.
    };
  }(hsid)).end()

  // "remove-from-dropbox" event
  // (anchors in the .dropbox-remove cells in the .dropbox table)
  .find('.dropbox .dropbox-remove a').unbind().click(function(_hsid) {
    return function() {
      var isDisabled = $('#hierarchical-select-'+ hsid +'-wrapper', Drupal.HierarchicalSelect.context).attr('disabled');

      // If the hierarchical select is disabled, then ignore this click.
      if (isDisabled) {
        return false;
      }

      // Check the (hidden, because JS is enabled) checkbox that marks this
      // dropbox entry for removal.
      $(this).parent().find('input[type=checkbox]').attr('checked', true);
      Drupal.HierarchicalSelect.update(_hsid, 'remove-from-dropbox', { opString: updateOpString });
      return false; // Prevent the browser from POSTing the page.
    };
  }(hsid));
};

Drupal.HierarchicalSelect.preUpdateAnimations = function(hsid, updateType, lastUnchanged, callback) {
  switch (updateType) {
    case 'update-hierarchical-select':
      // Drop out the selects of the levels deeper than the select of the
      // level that just changed.
      var animationDelay = Drupal.settings.HierarchicalSelect.settings["hs-" + hsid]['animationDelay'];
      var $animatedSelects = $('#hierarchical-select-'+ hsid +'-wrapper .hierarchical-select .selects select', Drupal.HierarchicalSelect.context).slice(lastUnchanged);
      if ($animatedSelects.size() > 0) {
        $animatedSelects.hide();
        for (var i = 0; i < $animatedSelects.size(); i++) {
          if (i < $animatedSelects.size() - 1) {
            $animatedSelects.slice(i, i + 1).hide("drop", { direction: "left" }, animationDelay);
          }
          else {
            $animatedSelects.slice(i, i + 1).hide("drop", { direction: "left" }, animationDelay, callback);
          }
        }
      }
      else if (callback) {
        callback();
      }
      break;
    default:
      if (callback) {
        callback();
      }
      break;
  }
};

Drupal.HierarchicalSelect.postUpdateAnimations = function(hsid, updateType, lastUnchanged, callback) {
  if (Drupal.settings.HierarchicalSelect.settings["hs-" + hsid].resizable) {
    // Restore the resize.
    Drupal.HierarchicalSelect.resize(
      $('#hierarchical-select-' + hsid + '-wrapper .hierarchical-select .selects select', Drupal.HierarchicalSelect.context),
      Drupal.HierarchicalSelect.state["hs-" + hsid].defaultHeight,
      Drupal.HierarchicalSelect.state["hs-" + hsid].resizedHeight,
      Drupal.HierarchicalSelect.state["hs-" + hsid].defaultSize,
      Drupal.HierarchicalSelect.state["hs-" + hsid].margin
    );
  }

  switch (updateType) {
    case 'update-hierarchical-select':
      var $createNewItemInput = $('#hierarchical-select-'+ hsid +'-wrapper .hierarchical-select .create-new-item-input', Drupal.HierarchicalSelect.context);
      // Hide the loaded selects after the one that was just changed, then
      // drop them in.
      var animationDelay = Drupal.settings.HierarchicalSelect.settings["hs-" + hsid]['animationDelay'];
      var $animatedSelects = $('#hierarchical-select-'+ hsid +'-wrapper .hierarchical-select .selects select', Drupal.HierarchicalSelect.context).slice(lastUnchanged);
      if ($animatedSelects.size() > 0) {
        $animatedSelects.hide();
        for (var i = 0; i < $animatedSelects.size(); i++) {
          if (i < $animatedSelects.size() - 1) {
            $animatedSelects.slice(i, i + 1).show("drop", { direction: "left" }, animationDelay);
          }
          else {
            $animatedSelects.slice(i, i + 1).show("drop", { direction: "left" }, animationDelay, callback);
          }
        }
      }
      else if (callback) {
        callback();
      }
      if ($createNewItemInput.size() == 0) {
        // Give focus to the level below the one that has changed, if it
        // exists.
        setTimeout(
          function() {
            $('#hierarchical-select-'+ hsid +'-wrapper .hierarchical-select .selects select', Drupal.HierarchicalSelect.context)
              .slice(lastUnchanged, lastUnchanged + 1)
              .focus();
          },
          animationDelay + 100
        );
      }
      else {
        // Give focus to the input field of the "create new item/level"
        // section, if it exists, and also select the existing text.
        $createNewItemInput.focus();
        $createNewItemInput[0].select();
      }
      break;

    case 'create-new-item':
      // Make sure that other Hierarchical Selects that represent the same
      // hierarchy are also updated, to make sure that they have the newly
      // created item!
      var cacheId = Drupal.settings.HierarchicalSelect.settings["hs-" + hsid].cacheId;
      for (var otherHsid in Drupal.settings.HierarchicalSelect.settings) {
        if (Drupal.settings.HierarchicalSelect.settings[otherHsid].cacheId == cacheId) {
          $('#hierarchical-select-'+ otherHsid +'-wrapper')
          .trigger('enforce-update');
        }
      }
      // TRICKY: NO BREAK HERE!

    case 'cancel-new-item':
      // After an item/level has been created/cancelled, reset focus to the
      // beginning of the hierarchical select.
      $('#hierarchical-select-'+ hsid +'-wrapper .hierarchical-select .selects select', Drupal.HierarchicalSelect.context)
      .slice(0, 1)
      .focus();

      if (callback) {
        callback();
      }
      break;

    default:
      if (callback) {
        callback();
      }
      break;
  }
};

Drupal.HierarchicalSelect.triggerEvents = function(hsid, updateType, settings) {
  $('#hierarchical-select-'+ hsid +'-wrapper', Drupal.HierarchicalSelect.context)
  .trigger(updateType, [ hsid, settings ]);
};

Drupal.HierarchicalSelect.update = function(hsid, updateType, settings) {
  var post = $('form:has(#hierarchical-select-' + hsid +'-wrapper)', Drupal.HierarchicalSelect.context).formToArray();
  var hs_current_language = Drupal.settings.HierarchicalSelect.hs_current_language;

  // Pass the hierarchical_select id via POST.
  post.push({ name : 'hsid', value : hsid });
  // Send the current language so we can use the same language during the AJAX callback.
  post.push({ name : 'hs_current_language', value : hs_current_language});
  // Emulate the AJAX data sent normally so that we get the same theme.
  post.push({ name : 'ajax_page_state[theme]', value : Drupal.settings.ajaxPageState.theme });
  post.push({ name : 'ajax_page_state[theme_token]', value : Drupal.settings.ajaxPageState.theme_token });

  // If a cache system is installed, let the server know if it's running
  // properly. If it is running properly, the server will send back additional
  // information to maintain a lazily-loaded cache.
  if (Drupal.HierarchicalSelect.cache != null) {
    post.push({ name : 'client_supports_caching', value : Drupal.HierarchicalSelect.cache.status() });
  }

  // updateType is one of:
  // - 'none' (default)
  // - 'update-hierarchical-select'
  // - 'enforced-update'
  // - 'create-new-item'
  // - 'cancel-new-item'
  // - 'add-to-dropbox'
  // - 'remove-from-dropbox'
  switch (updateType) {
    case 'update-hierarchical-select':
      var value = $('#'+ settings.select_id).val();
      var lastUnchanged = parseInt(settings.select_id.replace(/^.*-hierarchical-select-selects-(\d+)/, "$1")) + 1;
      var optionClass = $('#'+ settings.select_id).find('option[value="'+ value +'"]').attr('class');

      // Don't do anything (also no callback to the server!) when the selected
      // item is:
      // - the '<none>' option and the renderFlatSelect setting is disabled, or
      // - a level label, or
      // - an option of class 'has-no-children', and
      //   (the renderFlatSelect setting is disabled or the dropbox is enabled)
      //   and
      //   (the createNewLevels setting is disabled).
      if ((value == 'none' && Drupal.settings.HierarchicalSelect.settings["hs-" + hsid]['renderFlatSelect'] == false)
          || value.match(/^label_\d+$/)
          || (optionClass == 'has-no-children'
             &&
             (
               (Drupal.settings.HierarchicalSelect.settings["hs-" + hsid]['renderFlatSelect'] == false
                || $('#hierarchical-select-'+ hsid +'-wrapper .dropbox').length > 0
               )
               &&
               Drupal.settings.HierarchicalSelect.settings["hs-" + hsid]['createNewLevels'] == false
             )
           )
         )
      {
        Drupal.HierarchicalSelect.preUpdateAnimations(hsid, updateType, lastUnchanged, function() {
          // Remove the sublevels.
          $('#hierarchical-select-'+ hsid +'-wrapper .hierarchical-select .selects select', Drupal.HierarchicalSelect.context)
          .slice(lastUnchanged)
          .remove();

          // The selection of this hierarchical select has changed!
          Drupal.HierarchicalSelect.triggerEvents(hsid, 'change-hierarchical-select', settings);
        });
        return;
      }
      post.push({ name : 'op', value : settings.opString });
      break;

    case 'enforced-update':
      post.push({ name : 'op', value : settings.opString });
      post = post.concat(settings.extraPost);
      break;

    case 'create-new-item':
    case 'cancel-new-item':
    case 'add-to-dropbox':
    case 'remove-from-dropbox':
      post.push({ name : 'op', value : settings.opString });
      break;

    default:
      break;
  }

  // Construct the URL the request should be made to.
  var url = Drupal.settings.HierarchicalSelect.settings["hs-" + hsid].ajax_url;

  // Construct the object that contains the options for a callback to the
  // server. If a client-side cache is found however, it's possible that this
  // won't be used.
  var ajaxOptions = $.extend({}, Drupal.ajax.prototype, {
    url:        url,
    type:       'POST',
    dataType:   'json',
    data:       post,
    effect:     'fade',
    wrapper:    '#hierarchical-select-' + hsid + '-wrapper',
    beforeSend: function() {
      Drupal.HierarchicalSelect.triggerEvents(hsid, 'before-' + updateType, settings);
      Drupal.HierarchicalSelect.disableForm(hsid);
    },
    error: function (XMLHttpRequest, textStatus, errorThrown) {
      // When invalid HTML is received in Safari, jQuery calls this function.
      Drupal.HierarchicalSelect.throwError(hsid, Drupal.t('Received an invalid response from the server.'));
    },
    success: function(response, status) {
      // An invalid response may be returned by the server, in case of a PHP
      // error. Detect this and let the user know.
      if (response === null || response.length == 0) {
        Drupal.HierarchicalSelect.throwError(hsid, Drupal.t('Received an invalid response from the server.'));
        return;
      }

      // Execute all AJAX commands in the response. But pass an additional
      // hsid parameter, which is then only used by the commands written
      // for Hierarchical Select.

      // This is another hack because of the non-Drupal ajax implementation
      // of this module, one of the response that can come from a drupal
      // ajax command is insert, which expects a Drupal.ajax object as the first
      // arguments and assumes that certain functions/settings are available.
      // Because we are calling a Drupal.ajax.command but providing the regular
      // jQuery ajax object itself, we are allowing Drupal.ajax.prototype.commands
      // to misserably fail.
      //
      // This hack attempts to fix one issue with an insert command,
      // @see https://www.drupal.org/node/2393695, allowing it to work properly
      // Other hacks might be necessary for other ajax commands if they are added
      // by external modules.
      this.effect = 'none';
      this.getEffect = Drupal.ajax.prototype.getEffect;

      for (var i in response) {
        if (response[i]['command'] && Drupal.ajax.prototype.commands[response[i]['command']]) {
          Drupal.ajax.prototype.commands[response[i]['command']](this, response[i], status, hsid);
        }
      }

      // Attach behaviors. This is just after the HTML has been updated, so
      // it's as soon as we can.
      Drupal.attachBehaviors($('#hierarchical-select-' + hsid + '-wrapper').parents('div.form-type-hierarchical-select')[0]);

      // Transform the hierarchical select and/or dropbox to the JS variant,
      // make it resizable again and re-enable the disabled form items.
      Drupal.HierarchicalSelect.enableForm(hsid);

      Drupal.HierarchicalSelect.postUpdateAnimations(hsid, updateType, lastUnchanged, function() {
        // Update the client-side cache when:
        // - information for in the cache is provided in the response, and
        // - the cache system is available, and
        // - the cache system is running.
        if (response.cache != null && Drupal.HierarchicalSelect.cache != null && Drupal.HierarchicalSelect.cache.status()) {
          Drupal.HierarchicalSelect.cache.sync(hsid, response.cache);
        }

        if (response.log != undefined) {
          Drupal.HierarchicalSelect.log(hsid, response.log);
        }

        Drupal.HierarchicalSelect.triggerEvents(hsid, updateType, settings);

        if (updateType == 'update-hierarchical-select') {
          // The selection of this hierarchical select has changed!
          Drupal.HierarchicalSelect.triggerEvents(hsid, 'change-hierarchical-select', settings);
        }
      });
    }
  });

  // Use the client-side cache to update the hierarchical select when:
  // - the hierarchical select is being updated (i.e. no add/remove), and
  // - the renderFlatSelect setting is disabled, and
  // - the createNewItems setting is disabled, and
  // - the cache system is available, and
  // - the cache system is running.
  // Otherwise, perform a normal dynamic form submit.
  if (updateType == 'update-hierarchical-select'
      && Drupal.settings.HierarchicalSelect.settings["hs-" + hsid]['renderFlatSelect'] == false
      && Drupal.settings.HierarchicalSelect.settings["hs-" + hsid]['createNewItems'] == false
      && Drupal.HierarchicalSelect.cache != null
      && Drupal.HierarchicalSelect.cache.status())
  {
    Drupal.HierarchicalSelect.cache.updateHierarchicalSelect(hsid, value, settings, lastUnchanged, ajaxOptions);
  }
  else {
    Drupal.HierarchicalSelect.preUpdateAnimations(hsid, updateType, lastUnchanged, function() {
      // Adding current theme to prevent conflicts, @see ajax.js
      // @TODO, try converting to use Drupal.ajax instead.

      // Prevent duplicate HTML ids in the returned markup.
      // @see drupal_html_id()
      var ids = [];
      $('[id]').each(function () {
        ids.push(this.id);
      });

      ajaxOptions.data.push({ name : 'ajax_html_ids[]', value : ids });

      ajaxOptions.data.push({ name : 'ajax_page_state[theme]', value : Drupal.settings.ajaxPageState.theme });
      ajaxOptions.data.push({ name : 'ajax_page_state[theme_token]', value : Drupal.settings.ajaxPageState.theme_token });
      for (var key in Drupal.settings.ajaxPageState.css) {
        ajaxOptions.data.push({ name : 'ajax_page_state[css][' + key + ']', value : 1});
      }
      for (var key in Drupal.settings.ajaxPageState.js) {
        ajaxOptions.data.push({ name : 'ajax_page_state[js][' + key + ']', value : 1});
      }

      // Make it work with jquery update
      if (Drupal.settings.ajaxPageState.jquery_version) {
        ajaxOptions.data.push({ name : 'ajax_page_state[jquery_version]', value : Drupal.settings.ajaxPageState.jquery_version });
      }

      $.ajax(ajaxOptions);
    });
  }
};

Drupal.ajax.prototype.commands.hierarchicalSelectUpdate = function(ajax, response, status, hsid) {
  // Replace the old HTML with the (relevant part of) retrieved HTML.
  $('#hierarchical-select-'+ hsid +'-wrapper', Drupal.HierarchicalSelect.context)
  .parent('.form-item')
  .replaceWith($(response.output));
};

Drupal.ajax.prototype.commands.hierarchicalSelectSettingsUpdate = function(ajax, response, status, hsid) {
  Drupal.settings.HierarchicalSelect.settings["hs-" + response.hsid] = response.settings;
};

})(jQuery);