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/*
 * jQuery EasyTabs plugin 3.2.0
 *
 * Copyright (c) 2010-2011 Steve Schwartz (JangoSteve)
 *
 * Dual licensed under the MIT and GPL licenses:
 *   http://www.opensource.org/licenses/mit-license.php
 *   http://www.gnu.org/licenses/gpl.html
 *
 * Date: Thu May 09 17:30:00 2013 -0500
 */
( function($) {

  $.easytabs = function(container, options) {

        // Attach to plugin anything that should be available via
        // the $container.data('easytabs') object
    var plugin = this,
        $container = $(container),

        defaults = {
          animate: true,
          panelActiveClass: "active",
          tabActiveClass: "active",
          defaultTab: "li:first-child",
          animationSpeed: "normal",
          tabs: "> ul > li",
          updateHash: true,
          cycle: false,
          collapsible: false,
          collapsedClass: "collapsed",
          collapsedByDefault: true,
          uiTabs: false,
          transitionIn: 'fadeIn',
          transitionOut: 'fadeOut',
          transitionInEasing: 'swing',
          transitionOutEasing: 'swing',
          transitionCollapse: 'slideUp',
          transitionUncollapse: 'slideDown',
          transitionCollapseEasing: 'swing',
          transitionUncollapseEasing: 'swing',
          containerClass: "",
          tabsClass: "",
          tabClass: "",
          panelClass: "",
          cache: true,
          event: 'click',
          panelContext: $container
        },

        // Internal instance variables
        // (not available via easytabs object)
        $defaultTab,
        $defaultTabLink,
        transitions,
        lastHash,
        skipUpdateToHash,
        animationSpeeds = {
          fast: 200,
          normal: 400,
          slow: 600
        },

        // Shorthand variable so that we don't need to call
        // plugin.settings throughout the plugin code
        settings;

    // =============================================================
    // Functions available via easytabs object
    // =============================================================

    plugin.init = function() {

      plugin.settings = settings = $.extend({}, defaults, options);
      settings.bind_str = settings.event+".easytabs";

      // Add jQuery UI's crazy class names to markup,
      // so that markup will match theme CSS
      if ( settings.uiTabs ) {
        settings.tabActiveClass = 'ui-tabs-selected';
        settings.containerClass = 'ui-tabs ui-widget ui-widget-content ui-corner-all';
        settings.tabsClass = 'ui-tabs-nav ui-helper-reset ui-helper-clearfix ui-widget-header ui-corner-all';
        settings.tabClass = 'ui-state-default ui-corner-top';
        settings.panelClass = 'ui-tabs-panel ui-widget-content ui-corner-bottom';
      }

      // If collapsible is true and defaultTab specified, assume user wants defaultTab showing (not collapsed)
      if ( settings.collapsible && options.defaultTab !== undefined && options.collpasedByDefault === undefined ) {
        settings.collapsedByDefault = false;
      }

      // Convert 'normal', 'fast', and 'slow' animation speed settings to their respective speed in milliseconds
      if ( typeof(settings.animationSpeed) === 'string' ) {
        settings.animationSpeed = animationSpeeds[settings.animationSpeed];
      }

      $('a.anchor').remove().prependTo('body');

      // Store easytabs object on container so we can easily set
      // properties throughout
      $container.data('easytabs', {});

      plugin.setTransitions();

      plugin.getTabs();

      addClasses();

      setDefaultTab();

      bindToTabClicks();

      initHashChange();

      initCycle();

      // Append data-easytabs HTML attribute to make easy to query for
      // easytabs instances via CSS pseudo-selector
      $container.attr('data-easytabs', true);
    };

    // Set transitions for switching between tabs based on options.
    // Could be used to update transitions if settings are changes.
    plugin.setTransitions = function() {
      transitions = ( settings.animate ) ? {
          show: settings.transitionIn,
          hide: settings.transitionOut,
          speed: settings.animationSpeed,
          collapse: settings.transitionCollapse,
          uncollapse: settings.transitionUncollapse,
          halfSpeed: settings.animationSpeed / 2
        } :
        {
          show: "show",
          hide: "hide",
          speed: 0,
          collapse: "hide",
          uncollapse: "show",
          halfSpeed: 0
        };
    };

    // Find and instantiate tabs and panels.
    // Could be used to reset tab and panel collection if markup is
    // modified.
    plugin.getTabs = function() {
      var $matchingPanel;

      // Find the initial set of elements matching the setting.tabs
      // CSS selector within the container
      plugin.tabs = $container.find(settings.tabs),

      // Instantiate panels as empty jquery object
      plugin.panels = $(),

      plugin.tabs.each(function(){
        var $tab = $(this),
            $a = $tab.children('a'),

            // targetId is the ID of the panel, which is either the
            // `href` attribute for non-ajax tabs, or in the
            // `data-target` attribute for ajax tabs since the `href` is
            // the ajax URL
            targetId = $tab.children('a').data('target');

        $tab.data('easytabs', {});

        // If the tab has a `data-target` attribute, and is thus an ajax tab
        if ( targetId !== undefined && targetId !== null ) {
          $tab.data('easytabs').ajax = $a.attr('href');
        } else {
          targetId = $a.attr('href');
        }
        targetId = targetId.match(/#([^\?]+)/)[1];

        $matchingPanel = settings.panelContext.find("#" + targetId);

        // If tab has a matching panel, add it to panels
        if ( $matchingPanel.length ) {

          // Store panel height before hiding
          $matchingPanel.data('easytabs', {
            position: $matchingPanel.css('position'),
            visibility: $matchingPanel.css('visibility')
          });

          // Don't hide panel if it's active (allows `getTabs` to be called manually to re-instantiate tab collection)
          $matchingPanel.not(settings.panelActiveClass).hide();

          plugin.panels = plugin.panels.add($matchingPanel);

          $tab.data('easytabs').panel = $matchingPanel;

        // Otherwise, remove tab from tabs collection
        } else {
          plugin.tabs = plugin.tabs.not($tab);
          if ('console' in window) {
            console.warn('Warning: tab without matching panel for selector \'#' + targetId +'\' removed from set');
          }
        }
      });
    };

    // Select tab and fire callback
    plugin.selectTab = function($clicked, callback) {
      var url = window.location,
          hash = url.hash.match(/^[^\?]*/)[0],
          $targetPanel = $clicked.parent().data('easytabs').panel,
          ajaxUrl = $clicked.parent().data('easytabs').ajax;

      // Tab is collapsible and active => toggle collapsed state
      if( settings.collapsible && ! skipUpdateToHash && ($clicked.hasClass(settings.tabActiveClass) || $clicked.hasClass(settings.collapsedClass)) ) {
        plugin.toggleTabCollapse($clicked, $targetPanel, ajaxUrl, callback);

      // Tab is not active and panel is not active => select tab
      } else if( ! $clicked.hasClass(settings.tabActiveClass) || ! $targetPanel.hasClass(settings.panelActiveClass) ){
        activateTab($clicked, $targetPanel, ajaxUrl, callback);

      // Cache is disabled => reload (e.g reload an ajax tab).
      } else if ( ! settings.cache ){
        activateTab($clicked, $targetPanel, ajaxUrl, callback);
      }

    };

    // Toggle tab collapsed state and fire callback
    plugin.toggleTabCollapse = function($clicked, $targetPanel, ajaxUrl, callback) {
      plugin.panels.stop(true,true);

      if( fire($container,"easytabs:before", [$clicked, $targetPanel, settings]) ){
        plugin.tabs.filter("." + settings.tabActiveClass).removeClass(settings.tabActiveClass).children().removeClass(settings.tabActiveClass);

        // If panel is collapsed, uncollapse it
        if( $clicked.hasClass(settings.collapsedClass) ){

          // If ajax panel and not already cached
          if( ajaxUrl && (!settings.cache || !$clicked.parent().data('easytabs').cached) ) {
            $container.trigger('easytabs:ajax:beforeSend', [$clicked, $targetPanel]);

            $targetPanel.load(ajaxUrl, function(response, status, xhr){
              $clicked.parent().data('easytabs').cached = true;
              $container.trigger('easytabs:ajax:complete', [$clicked, $targetPanel, response, status, xhr]);
            });
          }

          // Update CSS classes of tab and panel
          $clicked.parent()
            .removeClass(settings.collapsedClass)
            .addClass(settings.tabActiveClass)
            .children()
              .removeClass(settings.collapsedClass)
              .addClass(settings.tabActiveClass);

          $targetPanel
            .addClass(settings.panelActiveClass)
            [transitions.uncollapse](transitions.speed, settings.transitionUncollapseEasing, function(){
              $container.trigger('easytabs:midTransition', [$clicked, $targetPanel, settings]);
              if(typeof callback == 'function') callback();
            });

        // Otherwise, collapse it
        } else {

          // Update CSS classes of tab and panel
          $clicked.addClass(settings.collapsedClass)
            .parent()
              .addClass(settings.collapsedClass);

          $targetPanel
            .removeClass(settings.panelActiveClass)
            [transitions.collapse](transitions.speed, settings.transitionCollapseEasing, function(){
              $container.trigger("easytabs:midTransition", [$clicked, $targetPanel, settings]);
              if(typeof callback == 'function') callback();
            });
        }
      }
    };


    // Find tab with target panel matching value
    plugin.matchTab = function(hash) {
      return plugin.tabs.find("[href='" + hash + "'],[data-target='" + hash + "']").first();
    };

    // Find panel with `id` matching value
    plugin.matchInPanel = function(hash) {
      return ( hash && plugin.validId(hash) ? plugin.panels.filter(':has(' + hash + ')').first() : [] );
    };

    // Make sure hash is a valid id value (admittedly strict in that HTML5 allows almost anything without a space)
    // but jQuery has issues with such id values anyway, so we can afford to be strict here.
    plugin.validId = function(id) {
      return id.substr(1).match(/^[A-Za-z]+[A-Za-z0-9\-_:\.].$/);
    };

    // Select matching tab when URL hash changes
    plugin.selectTabFromHashChange = function() {
      var hash = window.location.hash.match(/^[^\?]*/)[0],
          $tab = plugin.matchTab(hash),
          $panel;

      if ( settings.updateHash ) {

        // If hash directly matches tab
        if( $tab.length ){
          skipUpdateToHash = true;
          plugin.selectTab( $tab );

        } else {
          $panel = plugin.matchInPanel(hash);

          // If panel contains element matching hash
          if ( $panel.length ) {
            hash = '#' + $panel.attr('id');
            $tab = plugin.matchTab(hash);
            skipUpdateToHash = true;
            plugin.selectTab( $tab );

          // If default tab is not active...
          } else if ( ! $defaultTab.hasClass(settings.tabActiveClass) && ! settings.cycle ) {

            // ...and hash is blank or matches a parent of the tab container or
            // if the last tab (before the hash updated) was one of the other tabs in this container.
            if ( hash === '' || plugin.matchTab(lastHash).length || $container.closest(hash).length ) {
              skipUpdateToHash = true;
              plugin.selectTab( $defaultTabLink );
            }
          }
        }
      }
    };

    // Cycle through tabs
    plugin.cycleTabs = function(tabNumber){
      if(settings.cycle){
        tabNumber = tabNumber % plugin.tabs.length;
        $tab = $( plugin.tabs[tabNumber] ).children("a").first();
        skipUpdateToHash = true;
        plugin.selectTab( $tab, function() {
          setTimeout(function(){ plugin.cycleTabs(tabNumber + 1); }, settings.cycle);
        });
      }
    };

    // Convenient public methods
    plugin.publicMethods = {
      select: function(tabSelector){
        var $tab;

        // Find tab container that matches selector (like 'li#tab-one' which contains tab link)
        if ( ($tab = plugin.tabs.filter(tabSelector)).length === 0 ) {

          // Find direct tab link that matches href (like 'a[href="#panel-1"]')
          if ( ($tab = plugin.tabs.find("a[href='" + tabSelector + "']")).length === 0 ) {

            // Find direct tab link that matches selector (like 'a#tab-1')
            if ( ($tab = plugin.tabs.find("a" + tabSelector)).length === 0 ) {

              // Find direct tab link that matches data-target (lik 'a[data-target="#panel-1"]')
              if ( ($tab = plugin.tabs.find("[data-target='" + tabSelector + "']")).length === 0 ) {

                // Find direct tab link that ends in the matching href (like 'a[href$="#panel-1"]', which would also match http://example.com/currentpage/#panel-1)
                if ( ($tab = plugin.tabs.find("a[href$='" + tabSelector + "']")).length === 0 ) {

                  $.error('Tab \'' + tabSelector + '\' does not exist in tab set');
                }
              }
            }
          }
        } else {
          // Select the child tab link, since the first option finds the tab container (like <li>)
          $tab = $tab.children("a").first();
        }
        plugin.selectTab($tab);
      }
    };

    // =============================================================
    // Private functions
    // =============================================================

    // Triggers an event on an element and returns the event result
    var fire = function(obj, name, data) {
      var event = $.Event(name);
      obj.trigger(event, data);
      return event.result !== false;
    }

    // Add CSS classes to markup (if specified), called by init
    var addClasses = function() {
      $container.addClass(settings.containerClass);
      plugin.tabs.parent().addClass(settings.tabsClass);
      plugin.tabs.addClass(settings.tabClass);
      plugin.panels.addClass(settings.panelClass);
    };

    // Set the default tab, whether from hash (bookmarked) or option,
    // called by init
    var setDefaultTab = function(){
      var hash = window.location.hash.match(/^[^\?]*/)[0],
          $selectedTab = plugin.matchTab(hash).parent(),
          $panel;

      // If hash directly matches one of the tabs, active on page-load
      if( $selectedTab.length === 1 ){
        $defaultTab = $selectedTab;
        settings.cycle = false;

      } else {
        $panel = plugin.matchInPanel(hash);

        // If one of the panels contains the element matching the hash,
        // make it active on page-load
        if ( $panel.length ) {
          hash = '#' + $panel.attr('id');
          $defaultTab = plugin.matchTab(hash).parent();

        // Otherwise, make the default tab the one that's active on page-load
        } else {
          $defaultTab = plugin.tabs.parent().find(settings.defaultTab);
          if ( $defaultTab.length === 0 ) {
            $.error("The specified default tab ('" + settings.defaultTab + "') could not be found in the tab set ('" + settings.tabs + "') out of " + plugin.tabs.length + " tabs.");
          }
        }
      }

      $defaultTabLink = $defaultTab.children("a").first();

      activateDefaultTab($selectedTab);
    };

    // Activate defaultTab (or collapse by default), called by setDefaultTab
    var activateDefaultTab = function($selectedTab) {
      var defaultPanel,
          defaultAjaxUrl;

      if ( settings.collapsible && $selectedTab.length === 0 && settings.collapsedByDefault ) {
        $defaultTab
          .addClass(settings.collapsedClass)
          .children()
            .addClass(settings.collapsedClass);

      } else {

        defaultPanel = $( $defaultTab.data('easytabs').panel );
        defaultAjaxUrl = $defaultTab.data('easytabs').ajax;

        if ( defaultAjaxUrl && (!settings.cache || !$defaultTab.data('easytabs').cached) ) {
          $container.trigger('easytabs:ajax:beforeSend', [$defaultTabLink, defaultPanel]);
          defaultPanel.load(defaultAjaxUrl, function(response, status, xhr){
            $defaultTab.data('easytabs').cached = true;
            $container.trigger('easytabs:ajax:complete', [$defaultTabLink, defaultPanel, response, status, xhr]);
          });
        }

        $defaultTab.data('easytabs').panel
          .show()
          .addClass(settings.panelActiveClass);

        $defaultTab
          .addClass(settings.tabActiveClass)
          .children()
            .addClass(settings.tabActiveClass);
      }

      // Fire event when the plugin is initialised
      $container.trigger("easytabs:initialised", [$defaultTabLink, defaultPanel]);
    };

    // Bind tab-select funtionality to namespaced click event, called by
    // init
    var bindToTabClicks = function() {
      plugin.tabs.children("a").bind(settings.bind_str, function(e) {

        // Stop cycling when a tab is clicked
        settings.cycle = false;

        // Hash will be updated when tab is clicked,
        // don't cause tab to re-select when hash-change event is fired
        skipUpdateToHash = false;

        // Select the panel for the clicked tab
        plugin.selectTab( $(this) );

        // Don't follow the link to the anchor
        e.preventDefault ? e.preventDefault() : e.returnValue = false;
      });
    };

    // Activate a given tab/panel, called from plugin.selectTab:
    //
    //   * fire `easytabs:before` hook
    //   * get ajax if new tab is an uncached ajax tab
    //   * animate out previously-active panel
    //   * fire `easytabs:midTransition` hook
    //   * update URL hash
    //   * animate in newly-active panel
    //   * update CSS classes for inactive and active tabs/panels
    //
    // TODO: This could probably be broken out into many more modular
    // functions
    var activateTab = function($clicked, $targetPanel, ajaxUrl, callback) {
      plugin.panels.stop(true,true);

      if( fire($container,"easytabs:before", [$clicked, $targetPanel, settings]) ){
        var $visiblePanel = plugin.panels.filter(":visible"),
            $panelContainer = $targetPanel.parent(),
            targetHeight,
            visibleHeight,
            heightDifference,
            showPanel,
            hash = window.location.hash.match(/^[^\?]*/)[0];

        if (settings.animate) {
          targetHeight = getHeightForHidden($targetPanel);
          visibleHeight = $visiblePanel.length ? setAndReturnHeight($visiblePanel) : 0;
          heightDifference = targetHeight - visibleHeight;
        }

        // Set lastHash to help indicate if defaultTab should be
        // activated across multiple tab instances.
        lastHash = hash;

        // TODO: Move this function elsewhere
        showPanel = function() {
          // At this point, the previous panel is hidden, and the new one will be selected
          $container.trigger("easytabs:midTransition", [$clicked, $targetPanel, settings]);

          // Gracefully animate between panels of differing heights, start height change animation *after* panel change if panel needs to contract,
          // so that there is no chance of making the visible panel overflowing the height of the target panel
          if (settings.animate && settings.transitionIn == 'fadeIn') {
            if (heightDifference < 0)
              $panelContainer.animate({
                height: $panelContainer.height() + heightDifference
              }, transitions.halfSpeed ).css({ 'min-height': '' });
          }

          if ( settings.updateHash && ! skipUpdateToHash ) {
            //window.location = url.toString().replace((url.pathname + hash), (url.pathname + $clicked.attr("href")));
            // Not sure why this behaves so differently, but it's more straight forward and seems to have less side-effects
            window.location.hash = '#' + $targetPanel.attr('id');
          } else {
            skipUpdateToHash = false;
          }

          $targetPanel
            [transitions.show](transitions.speed, settings.transitionInEasing, function(){
              $panelContainer.css({height: '', 'min-height': ''}); // After the transition, unset the height
              $container.trigger("easytabs:after", [$clicked, $targetPanel, settings]);
              // callback only gets called if selectTab actually does something, since it's inside the if block
              if(typeof callback == 'function'){
                callback();
              }
          });
        };

        if ( ajaxUrl && (!settings.cache || !$clicked.parent().data('easytabs').cached) ) {
          $container.trigger('easytabs:ajax:beforeSend', [$clicked, $targetPanel]);
          $targetPanel.load(ajaxUrl, function(response, status, xhr){
            $clicked.parent().data('easytabs').cached = true;
            $container.trigger('easytabs:ajax:complete', [$clicked, $targetPanel, response, status, xhr]);
          });
        }

        // Gracefully animate between panels of differing heights, start height change animation *before* panel change if panel needs to expand,
        // so that there is no chance of making the target panel overflowing the height of the visible panel
        if( settings.animate && settings.transitionOut == 'fadeOut' ) {
          if( heightDifference > 0 ) {
            $panelContainer.animate({
              height: ( $panelContainer.height() + heightDifference )
            }, transitions.halfSpeed );
          } else {
            // Prevent height jumping before height transition is triggered at midTransition
            $panelContainer.css({ 'min-height': $panelContainer.height() });
          }
        }

        // Change the active tab *first* to provide immediate feedback when the user clicks
        plugin.tabs.filter("." + settings.tabActiveClass).removeClass(settings.tabActiveClass).children().removeClass(settings.tabActiveClass);
        plugin.tabs.filter("." + settings.collapsedClass).removeClass(settings.collapsedClass).children().removeClass(settings.collapsedClass);
        $clicked.parent().addClass(settings.tabActiveClass).children().addClass(settings.tabActiveClass);

        plugin.panels.filter("." + settings.panelActiveClass).removeClass(settings.panelActiveClass);
        $targetPanel.addClass(settings.panelActiveClass);

        if( $visiblePanel.length ) {
          $visiblePanel
            [transitions.hide](transitions.speed, settings.transitionOutEasing, showPanel);
        } else {
          $targetPanel
            [transitions.uncollapse](transitions.speed, settings.transitionUncollapseEasing, showPanel);
        }
      }
    };

    // Get heights of panels to enable animation between panels of
    // differing heights, called by activateTab
    var getHeightForHidden = function($targetPanel){

      if ( $targetPanel.data('easytabs') && $targetPanel.data('easytabs').lastHeight ) {
        return $targetPanel.data('easytabs').lastHeight;
      }

      // this is the only property easytabs changes, so we need to grab its value on each tab change
      var display = $targetPanel.css('display'),
          outerCloak,
          height;

      // Workaround with wrapping height, because firefox returns wrong
      // height if element itself has absolute positioning.
      // but try/catch block needed for IE7 and IE8 because they throw
      // an "Unspecified error" when trying to create an element
      // with the css position set.
      try {
        outerCloak = $('<div></div>', {'position': 'absolute', 'visibility': 'hidden', 'overflow': 'hidden'});
      } catch (e) {
        outerCloak = $('<div></div>', {'visibility': 'hidden', 'overflow': 'hidden'});
      }
      height = $targetPanel
        .wrap(outerCloak)
        .css({'position':'relative','visibility':'hidden','display':'block'})
        .outerHeight();

      $targetPanel.unwrap();

      // Return element to previous state
      $targetPanel.css({
        position: $targetPanel.data('easytabs').position,
        visibility: $targetPanel.data('easytabs').visibility,
        display: display
      });

      // Cache height
      $targetPanel.data('easytabs').lastHeight = height;

      return height;
    };

    // Since the height of the visible panel may have been manipulated due to interaction,
    // we want to re-cache the visible height on each tab change, called
    // by activateTab
    var setAndReturnHeight = function($visiblePanel) {
      var height = $visiblePanel.outerHeight();

      if( $visiblePanel.data('easytabs') ) {
        $visiblePanel.data('easytabs').lastHeight = height;
      } else {
        $visiblePanel.data('easytabs', {lastHeight: height});
      }
      return height;
    };

    // Setup hash-change callback for forward- and back-button
    // functionality, called by init
    var initHashChange = function(){

      // enabling back-button with jquery.hashchange plugin
      // http://benalman.com/projects/jquery-hashchange-plugin/
      if(typeof $(window).hashchange === 'function'){
        $(window).hashchange( function(){
          plugin.selectTabFromHashChange();
        });
      } else if ($.address && typeof $.address.change === 'function') { // back-button with jquery.address plugin http://www.asual.com/jquery/address/docs/
        $.address.change( function(){
          plugin.selectTabFromHashChange();
        });
      }
    };

    // Begin cycling if set in options, called by init
    var initCycle = function(){
      var tabNumber;
      if (settings.cycle) {
        tabNumber = plugin.tabs.index($defaultTab);
        setTimeout( function(){ plugin.cycleTabs(tabNumber + 1); }, settings.cycle);
      }
    };


    plugin.init();

  };

  $.fn.easytabs = function(options) {
    var args = arguments;

    return this.each(function() {
      var $this = $(this),
          plugin = $this.data('easytabs');

      // Initialization was called with $(el).easytabs( { options } );
      if (undefined === plugin) {
        plugin = new $.easytabs(this, options);
        $this.data('easytabs', plugin);
      }

      // User called public method
      if ( plugin.publicMethods[options] ){
        return plugin.publicMethods[options](Array.prototype.slice.call( args, 1 ));
      }
    });
  };

})(jQuery);