(function ($) {

/**

 * Provides Ajax page updating via jQuery $.ajax (Asynchronous JavaScript and XML).

 *

 * Ajax is a method of making a request via JavaScript while viewing an HTML

 * page. The request returns an array of commands encoded in JSON, which is

 * then executed to make any changes that are necessary to the page.

 *

 * Drupal uses this file to enhance form elements with #ajax['path'] and

 * #ajax['wrapper'] properties. If set, this file will automatically be included

 * to provide Ajax capabilities.

 */

Drupal.ajax = Drupal.ajax || {};

Drupal.settings.urlIsAjaxTrusted = Drupal.settings.urlIsAjaxTrusted || {};

/**

 * Attaches the Ajax behavior to each Ajax form element.

 */

Drupal.behaviors.AJAX = {

  attach: function (context, settings) {

    // Load all Ajax behaviors specified in the settings.

    for (var base in settings.ajax) {

      if (!$('#' + base + '.ajax-processed').length) {

        var element_settings = settings.ajax[base];

        if (typeof element_settings.selector == 'undefined') {

          element_settings.selector = '#' + base;

        }

        $(element_settings.selector).each(function () {

          element_settings.element = this;

          Drupal.ajax[base] = new Drupal.ajax(base, this, element_settings);

        });

        $('#' + base).addClass('ajax-processed');

      }

    }

    // Bind Ajax behaviors to all items showing the class.

    $('.use-ajax:not(.ajax-processed)').addClass('ajax-processed').each(function () {

      var element_settings = {};

      // Clicked links look better with the throbber than the progress bar.

      element_settings.progress = { 'type': 'throbber' };

      // For anchor tags, these will go to the target of the anchor rather

      // than the usual location.

      if ($(this).attr('href')) {

        element_settings.url = $(this).attr('href');

        element_settings.event = 'click';

      }

      var base = $(this).attr('id');

      Drupal.ajax[base] = new Drupal.ajax(base, this, element_settings);

    });

    // This class means to submit the form to the action using Ajax.

    $('.use-ajax-submit:not(.ajax-processed)').addClass('ajax-processed').each(function () {

      var element_settings = {};

      // Ajax submits specified in this manner automatically submit to the

      // normal form action.

      element_settings.url = $(this.form).attr('action');

      // Form submit button clicks need to tell the form what was clicked so

      // it gets passed in the POST request.

      element_settings.setClick = true;

      // Form buttons use the 'click' event rather than mousedown.

      element_settings.event = 'click';

      // Clicked form buttons look better with the throbber than the progress bar.

      element_settings.progress = { 'type': 'throbber' };

      var base = $(this).attr('id');

      Drupal.ajax[base] = new Drupal.ajax(base, this, element_settings);

    });

  }

};

/**

 * Ajax object.

 *

 * All Ajax objects on a page are accessible through the global Drupal.ajax

 * object and are keyed by the submit button's ID. You can access them from

 * your module's JavaScript file to override properties or functions.

 *

 * For example, if your Ajax enabled button has the ID 'edit-submit', you can

 * redefine the function that is called to insert the new content like this

 * (inside a Drupal.behaviors attach block):

 * @code

 *    Drupal.behaviors.myCustomAJAXStuff = {

 *      attach: function (context, settings) {

 *        Drupal.ajax['edit-submit'].commands.insert = function (ajax, response, status) {

 *          new_content = $(response.data);

 *          $('#my-wrapper').append(new_content);

 *          alert('New content was appended to #my-wrapper');

 *        }

 *      }

 *    };

 * @endcode

 */

Drupal.ajax = function (base, element, element_settings) {

  var defaults = {

    url: 'system/ajax',

    event: 'mousedown',

    keypress: true,

    selector: '#' + base,

    effect: 'none',

    speed: 'none',

    method: 'replaceWith',

    progress: {

      type: 'throbber',

      message: Drupal.t('Please wait...')

    },

    submit: {

      'js': true

    }

  };

  $.extend(this, defaults, element_settings);

  this.element = element;

  this.element_settings = element_settings;

  // Replacing 'nojs' with 'ajax' in the URL allows for an easy method to let

  // the server detect when it needs to degrade gracefully.

  // There are five scenarios to check for:

  // 1. /nojs/

  // 2. /nojs$ - The end of a URL string.

  // 3. /nojs? - Followed by a query (with clean URLs enabled).

  //      E.g.: path/nojs?destination=foobar

  // 4. /nojs& - Followed by a query (without clean URLs enabled).

  //      E.g.: ?q=path/nojs&destination=foobar

  // 5. /nojs# - Followed by a fragment.

  //      E.g.: path/nojs#myfragment

  this.url = element_settings.url.replace(/\/nojs(\/|$|\?|&|#)/g, '/ajax$1');

  // If the 'nojs' version of the URL is trusted, also trust the 'ajax' version.

  if (Drupal.settings.urlIsAjaxTrusted[element_settings.url]) {

    Drupal.settings.urlIsAjaxTrusted[this.url] = true;

  }

  this.wrapper = '#' + element_settings.wrapper;

  // If there isn't a form, jQuery.ajax() will be used instead, allowing us to

  // bind Ajax to links as well.

  if (this.element.form) {

    this.form = $(this.element.form);

  }

  // Set the options for the ajaxSubmit function.

  // The 'this' variable will not persist inside of the options object.

  var ajax = this;

  ajax.options = {

    url: ajax.url,

    data: ajax.submit,

    beforeSerialize: function (element_settings, options) {

      return ajax.beforeSerialize(element_settings, options);

    },

    beforeSubmit: function (form_values, element_settings, options) {

      ajax.ajaxing = true;

      return ajax.beforeSubmit(form_values, element_settings, options);

    },

    beforeSend: function (xmlhttprequest, options) {

      ajax.ajaxing = true;

      return ajax.beforeSend(xmlhttprequest, options);

    },

    success: function (response, status, xmlhttprequest) {

      // Sanity check for browser support (object expected).

      // When using iFrame uploads, responses must be returned as a string.

      if (typeof response == 'string') {

        response = $.parseJSON(response);

      }

      // Prior to invoking the response's commands, verify that they can be

      // trusted by checking for a response header. See

      // ajax_set_verification_header() for details.

      // - Empty responses are harmless so can bypass verification. This avoids

      //   an alert message for server-generated no-op responses that skip Ajax

      //   rendering.

      // - Ajax objects with trusted URLs (e.g., ones defined server-side via

      //   #ajax) can bypass header verification. This is especially useful for

      //   Ajax with multipart forms. Because IFRAME transport is used, the

      //   response headers cannot be accessed for verification.

      if (response !== null && !Drupal.settings.urlIsAjaxTrusted[ajax.url]) {

        if (xmlhttprequest.getResponseHeader('X-Drupal-Ajax-Token') !== '1') {

          var customMessage = Drupal.t("The response failed verification so will not be processed.");

          return ajax.error(xmlhttprequest, ajax.url, customMessage);

        }

      }

      return ajax.success(response, status);

    },

    complete: function (xmlhttprequest, status) {

      ajax.ajaxing = false;

      if (status == 'error' || status == 'parsererror') {

        return ajax.error(xmlhttprequest, ajax.url);

      }

    },

    dataType: 'json',

    type: 'POST'

  };

  // Bind the ajaxSubmit function to the element event.

  $(ajax.element).bind(element_settings.event, function (event) {

    if (!Drupal.settings.urlIsAjaxTrusted[ajax.url] && !Drupal.urlIsLocal(ajax.url)) {

      throw new Error(Drupal.t('The callback URL is not local and not trusted: !url', {'!url': ajax.url}));

    }

    return ajax.eventResponse(this, event);

  });

  // If necessary, enable keyboard submission so that Ajax behaviors

  // can be triggered through keyboard input as well as e.g. a mousedown

  // action.

  if (element_settings.keypress) {

    $(ajax.element).keypress(function (event) {

      return ajax.keypressResponse(this, event);

    });

  }

  // If necessary, prevent the browser default action of an additional event.

  // For example, prevent the browser default action of a click, even if the

  // AJAX behavior binds to mousedown.

  if (element_settings.prevent) {

    $(ajax.element).bind(element_settings.prevent, false);

  }

};

/**

 * Handle a key press.

 *

 * The Ajax object will, if instructed, bind to a key press response. This

 * will test to see if the key press is valid to trigger this event and

 * if it is, trigger it for us and prevent other keypresses from triggering.

 * In this case we're handling RETURN and SPACEBAR keypresses (event codes 13

 * and 32. RETURN is often used to submit a form when in a textfield, and 

 * SPACE is often used to activate an element without submitting. 

 */

Drupal.ajax.prototype.keypressResponse = function (element, event) {

  // Create a synonym for this to reduce code confusion.

  var ajax = this;

  // Detect enter key and space bar and allow the standard response for them,

  // except for form elements of type 'text' and 'textarea', where the 

  // spacebar activation causes inappropriate activation if #ajax['keypress'] is 

  // TRUE. On a text-type widget a space should always be a space.

  if (event.which == 13 || (event.which == 32 && element.type != 'text' && element.type != 'textarea')) {

    $(ajax.element_settings.element).trigger(ajax.element_settings.event);

    return false;

  }

};

/**

 * Handle an event that triggers an Ajax response.

 *

 * When an event that triggers an Ajax response happens, this method will

 * perform the actual Ajax call. It is bound to the event using

 * bind() in the constructor, and it uses the options specified on the

 * ajax object.

 */

Drupal.ajax.prototype.eventResponse = function (element, event) {

  // Create a synonym for this to reduce code confusion.

  var ajax = this;

  // Do not perform another ajax command if one is already in progress.

  if (ajax.ajaxing) {

    return false;

  }

  try {

    if (ajax.form) {

      // If setClick is set, we must set this to ensure that the button's

      // value is passed.

      if (ajax.setClick) {

        // Mark the clicked button. 'form.clk' is a special variable for

        // ajaxSubmit that tells the system which element got clicked to

        // trigger the submit. Without it there would be no 'op' or

        // equivalent.

        element.form.clk = element;

      }

      ajax.form.ajaxSubmit(ajax.options);

    }

    else {

      ajax.beforeSerialize(ajax.element, ajax.options);

      $.ajax(ajax.options);

    }

  }

  catch (e) {

    // Unset the ajax.ajaxing flag here because it won't be unset during

    // the complete response.

    ajax.ajaxing = false;

    alert("An error occurred while attempting to process " + ajax.options.url + ": " + e.message);

  }

  // For radio/checkbox, allow the default event. On IE, this means letting

  // it actually check the box.

  if (typeof element.type != 'undefined' && (element.type == 'checkbox' || element.type == 'radio')) {

    return true;

  }

  else {

    return false;

  }

};

/**

 * Handler for the form serialization.

 *

 * Runs before the beforeSend() handler (see below), and unlike that one, runs

 * before field data is collected.

 */

Drupal.ajax.prototype.beforeSerialize = function (element, options) {

  // Allow detaching behaviors to update field values before collecting them.

  // This is only needed when field values are added to the POST data, so only

  // when there is a form such that this.form.ajaxSubmit() is used instead of

  // $.ajax(). When there is no form and $.ajax() is used, beforeSerialize()

  // isn't called, but don't rely on that: explicitly check this.form.

  if (this.form) {

    var settings = this.settings || Drupal.settings;

    Drupal.detachBehaviors(this.form, settings, 'serialize');

  }

  // Prevent duplicate HTML ids in the returned markup.

  // @see drupal_html_id()

  options.data['ajax_html_ids[]'] = [];

  $('[id]').each(function () {

    options.data['ajax_html_ids[]'].push(this.id);

  });

  // Allow Drupal to return new JavaScript and CSS files to load without

  // returning the ones already loaded.

  // @see ajax_base_page_theme()

  // @see drupal_get_css()

  // @see drupal_get_js()

  options.data['ajax_page_state[theme]'] = Drupal.settings.ajaxPageState.theme;

  options.data['ajax_page_state[theme_token]'] = Drupal.settings.ajaxPageState.theme_token;

  for (var key in Drupal.settings.ajaxPageState.css) {

    options.data['ajax_page_state[css][' + key + ']'] = 1;

  }

  for (var key in Drupal.settings.ajaxPageState.js) {

    options.data['ajax_page_state[js][' + key + ']'] = 1;

  }

};

/**

 * Modify form values prior to form submission.

 */

Drupal.ajax.prototype.beforeSubmit = function (form_values, element, options) {

  // This function is left empty to make it simple to override for modules

  // that wish to add functionality here.

};

/**

 * Prepare the Ajax request before it is sent.

 */

Drupal.ajax.prototype.beforeSend = function (xmlhttprequest, options) {

  // For forms without file inputs, the jQuery Form plugin serializes the form

  // values, and then calls jQuery's $.ajax() function, which invokes this

  // handler. In this circumstance, options.extraData is never used. For forms

  // with file inputs, the jQuery Form plugin uses the browser's normal form

  // submission mechanism, but captures the response in a hidden IFRAME. In this

  // circumstance, it calls this handler first, and then appends hidden fields

  // to the form to submit the values in options.extraData. There is no simple

  // way to know which submission mechanism will be used, so we add to extraData

  // regardless, and allow it to be ignored in the former case.

  if (this.form) {

    options.extraData = options.extraData || {};

    // Let the server know when the IFRAME submission mechanism is used. The

    // server can use this information to wrap the JSON response in a TEXTAREA,

    // as per http://jquery.malsup.com/form/#file-upload.

    options.extraData.ajax_iframe_upload = '1';

    // The triggering element is about to be disabled (see below), but if it

    // contains a value (e.g., a checkbox, textfield, select, etc.), ensure that

    // value is included in the submission. As per above, submissions that use

    // $.ajax() are already serialized prior to the element being disabled, so

    // this is only needed for IFRAME submissions.

    var v = $.fieldValue(this.element);

    if (v !== null) {

      options.extraData[this.element.name] = Drupal.checkPlain(v);

    }

  }

  // Disable the element that received the change to prevent user interface

  // interaction while the Ajax request is in progress. ajax.ajaxing prevents

  // the element from triggering a new request, but does not prevent the user

  // from changing its value.

  $(this.element).addClass('progress-disabled').attr('disabled', true);