//** Accordion Content script: By Dynamic Drive, at http://www.dynamicdrive.com
//** Created: Jan 7th, 08'. Last updated: June 7th, 2010 to v1.9

//Version 1.9: June 7th, 2010':
//**1) Ajax content support added, so a given header's content can be dynamically fetched from an external file and on demand.
//**2) Optimized script performance by caching header and content container references


var ddaccordion={
  ajaxloadingmsg: '<img src="http://www.taylor.edu/js/loading2.gif" /><br />Loading Content...', //customize HTML to output while Ajax content is being fetched (if applicable)

  headergroup: {}, //object to store corresponding header group based on headerclass value
  contentgroup: {}, //object to store corresponding content group based on headerclass value

  preloadimages:function($images){
    $images.each(function(){
      var preloadimage=new Image()
      preloadimage.src=this.src
    })
  },

  expandone:function(headerclass, selected){ //PUBLIC function to expand a particular header
    this.toggleone(headerclass, selected, "expand")
  },

  collapseone:function(headerclass, selected){ //PUBLIC function to collapse a particular header
    this.toggleone(headerclass, selected, "collapse")
  },

  expandall:function(headerclass){ //PUBLIC function to expand all headers based on their shared CSS classname
    var $headers=this.headergroup[headerclass]
    this.contentgroup[headerclass].filter(':hidden').each(function(){
      $headers.eq(parseInt($(this).attr('contentindex'))).trigger("evt_accordion")
    })
  },

  collapseall:function(headerclass){ //PUBLIC function to collapse all headers based on their shared CSS classname
    var $headers=this.headergroup[headerclass]
    this.contentgroup[headerclass].filter(':visible').each(function(){
      $headers.eq(parseInt($(this).attr('contentindex'))).trigger("evt_accordion")
    })
  },

  toggleone:function(headerclass, selected, optstate){ //PUBLIC function to expand/ collapse a particular header
    var $targetHeader=this.headergroup[headerclass].eq(selected)
    var $subcontent=this.contentgroup[headerclass].eq(selected)
    if (typeof optstate=="undefined" || optstate=="expand" && $subcontent.is(":hidden") || optstate=="collapse" && $subcontent.is(":visible"))
      $targetHeader.trigger("evt_accordion")
  },

  ajaxloadcontent:function($targetHeader, $targetContent, config, callback){
    var ajaxinfo=$targetHeader.data('ajaxinfo')

    function handlecontent(content){ //nested function
      if (content){ //if ajax content has loaded
        ajaxinfo.cacheddata=content //remember ajax content 
        ajaxinfo.status="cached" //set ajax status to cached
        if ($targetContent.queue("fx").length==0){ //if this content isn't currently expanding or collapsing
          $targetContent.hide().html(content) //hide loading message, then set sub content's HTML to ajax content
          ajaxinfo.status="complete" //set ajax status to complete
          callback() //execute callback function- expand this sub content
        }
      }
      if (ajaxinfo.status!="complete"){
        setTimeout(function(){handlecontent(ajaxinfo.cacheddata)}, 100) //call handlecontent() again until ajax content has loaded (ajaxinfo.cacheddata contains data)
      }
    } //end nested function

    if (ajaxinfo.status=="none"){ //ajax data hasn't been fetched yet
      $targetContent.html(this.ajaxloadingmsg)
      $targetContent.slideDown(config.animatespeed)
      ajaxinfo.status="loading" //set ajax status to "loading"
      $.ajax({
        url: ajaxinfo.url, //path to external menu file
        error:function(ajaxrequest){
          handlecontent('Error fetching content. Server Response: '+ajaxrequest.responseText)
        },
        success:function(content){
          content=(content=="")? " " : content //if returned content is empty, set it to "space" is content no longer returns false/empty (hasn't loaded yet)
          handlecontent(content)
        }
      })
    }
    else if (ajaxinfo.status=="loading")
      handlecontent(ajaxinfo.cacheddata)
  },

  expandit:function($targetHeader, $targetContent, config, useractivated, directclick, skipanimation){
    var ajaxinfo=$targetHeader.data('ajaxinfo')
    if (ajaxinfo){ //if this content should be fetched via Ajax
      if (ajaxinfo.status=="none" || ajaxinfo.status=="loading")
        this.ajaxloadcontent($targetHeader, $targetContent, config, function(){ddaccordion.expandit($targetHeader, $targetContent, config, useractivated, directclick)})
      else if (ajaxinfo.status=="cached"){
        $targetContent.html(ajaxinfo.cacheddata)
        ajaxinfo.cacheddata=null
        ajaxinfo.status="complete"
      }
    }
    this.transformHeader($targetHeader, config, "expand")
    $targetContent.slideDown(skipanimation? 0 : config.animatespeed, function(){
      config.onopenclose($targetHeader.get(0), parseInt($targetHeader.attr('headerindex')), $targetContent.css('display'), useractivated)
      if (config.postreveal=="gotourl" && directclick){ //if revealtype is "Go to Header URL upon click", and this is a direct click on the header
        var targetLink=($targetHeader.is("a"))? $targetHeader.get(0) : $targetHeader.find('a:eq(0)').get(0)
        if (targetLink) //if this header is a link
          setTimeout(function(){location=targetLink.href}, 200) //ignore link target, as window.open(targetLink, targetLink.target) doesn't work in FF if popup blocker enabled
      }
    })
  },

  collapseit:function($targetHeader, $targetContent, config, isuseractivated){
    this.transformHeader($targetHeader, config, "collapse")
    $targetContent.slideUp(config.animatespeed, function(){config.onopenclose($targetHeader.get(0), parseInt($targetHeader.attr('headerindex')), $targetContent.css('display'), isuseractivated)})
  },

  transformHeader:function($targetHeader, config, state){
    $targetHeader.addClass((state=="expand")? config.cssclass.expand : config.cssclass.collapse) //alternate btw "expand" and "collapse" CSS classes
    .removeClass((state=="expand")? config.cssclass.collapse : config.cssclass.expand)
    if (config.htmlsetting.location=='src'){ //Change header image (assuming header is an image)?
      $targetHeader=($targetHeader.is("img"))? $targetHeader : $targetHeader.find('img').eq(0) //Set target to either header itself, or first image within header
      $targetHeader.attr('src', (state=="expand")? config.htmlsetting.expand : config.htmlsetting.collapse) //change header image
    }
    else if (config.htmlsetting.location=="prefix") //if change "prefix" HTML, locate dynamically added ".accordprefix" span tag and change it
      $targetHeader.find('.accordprefix').html((state=="expand")? config.htmlsetting.expand : config.htmlsetting.collapse)
    else if (config.htmlsetting.location=="suffix")
      $targetHeader.find('.accordsuffix').html((state=="expand")? config.htmlsetting.expand : config.htmlsetting.collapse)
  },

  urlparamselect:function(headerclass){
    var result=window.location.search.match(new RegExp(headerclass+"=((\\d+)(,(\\d+))*)", "i")) //check for "?headerclass=2,3,4" in URL
    if (result!=null)
      result=RegExp.$1.split(',')
    return result //returns null, [index], or [index1,index2,etc], where index are the desired selected header indices
  },

  getCookie:function(Name){ 
    var re=new RegExp(Name+"=[^;]+", "i") //construct RE to search for target name/value pair
    if (document.cookie.match(re)) //if cookie found
      return document.cookie.match(re)[0].split("=")[1] //return its value
    return null
  },

  setCookie:function(name, value){
    document.cookie = name + "=" + value + "; path=/"
  },

  init:function(config){
  document.write('<style type="text/css">\n')
  document.write('.'+config.contentclass+'{display: none}\n') //generate CSS to hide contents
  document.write('a.hiddenajaxlink{display: none}\n') //CSS class to hide ajax link
  document.write('<\/style>')
  jQuery(document).ready(function($){
    ddaccordion.urlparamselect(config.headerclass)
    var persistedheaders=ddaccordion.getCookie(config.headerclass)
    ddaccordion.headergroup[config.headerclass]=$('.'+config.headerclass) //remember header group for this accordion
    ddaccordion.contentgroup[config.headerclass]=$('.'+config.contentclass) //remember content group for this accordion
    var $headers=ddaccordion.headergroup[config.headerclass]
    var $subcontents=ddaccordion.contentgroup[config.headerclass]
    config.cssclass={collapse: config.toggleclass[0], expand: config.toggleclass[1]} //store expand and contract CSS classes as object properties
    config.revealtype=config.revealtype || "click"
    config.revealtype=config.revealtype.replace(/mouseover/i, "mouseenter")
    if (config.revealtype=="clickgo"){
      config.postreveal="gotourl" //remember added action
      config.revealtype="click" //overwrite revealtype to "click" keyword
    }
    if (typeof config.togglehtml=="undefined")
      config.htmlsetting={location: "none"}
    else
      config.htmlsetting={location: config.togglehtml[0], collapse: config.togglehtml[1], expand: config.togglehtml[2]} //store HTML settings as object properties
    config.oninit=(typeof config.oninit=="undefined")? function(){} : config.oninit //attach custom "oninit" event handler
    config.onopenclose=(typeof config.onopenclose=="undefined")? function(){} : config.onopenclose //attach custom "onopenclose" event handler
    var lastexpanded={} //object to hold reference to last expanded header and content (jquery objects)
    var expandedindices=ddaccordion.urlparamselect(config.headerclass) || ((config.persiststate && persistedheaders!=null)? persistedheaders : config.defaultexpanded)
    if (typeof expandedindices=='string') //test for string value (exception is config.defaultexpanded, which is an array)
      expandedindices=expandedindices.replace(/c/ig, '').split(',') //transform string value to an array (ie: "c1,c2,c3" becomes [1,2,3]
    if (expandedindices.length==1 && expandedindices[0]=="-1") //check for expandedindices value of [-1], indicating persistence is on and no content expanded
      expandedindices=[]
    if (config["collapseprev"] && expandedindices.length>1) //only allow one content open?
      expandedindices=[expandedindices.pop()] //return last array element as an array (for sake of jQuery.inArray())
    if (config["onemustopen"] && expandedindices.length==0) //if at least one content should be open at all times and none are, open 1st header
      expandedindices=[0]
    $headers.each(function(index){ //loop through all headers
      var $header=$(this)
      if (/(prefix)|(suffix)/i.test(config.htmlsetting.location) && $header.html()!=""){ //add a SPAN element to header depending on user setting and if header is a container tag
        $('<span class="accordprefix"></span>').prependTo(this)
        $('<span class="accordsuffix"></span>').appendTo(this)
      }
      $header.attr('headerindex', index+'h') //store position of this header relative to its peers
      $subcontents.eq(index).attr('contentindex', index+'c') //store position of this content relative to its peers
      var $subcontent=$subcontents.eq(index)
      var $hiddenajaxlink=$subcontent.find('a.hiddenajaxlink:eq(0)') //see if this content should be loaded via ajax
      if ($hiddenajaxlink.length==1){
        $header.data('ajaxinfo', {url:$hiddenajaxlink.attr('href'), cacheddata:null, status:'none'}) //store info about this ajax content inside header
      }
      var needle=(typeof expandedindices[0]=="number")? index : index+'' //check for data type within expandedindices array- index should match that type
      if (jQuery.inArray(needle, expandedindices)!=-1){ //check for headers that should be expanded automatically (convert index to string first)
        ddaccordion.expandit($header, $subcontent, config, false, false, !config.animatedefault) //3rd last param sets 'isuseractivated' parameter, 2nd last sets isdirectclick, last sets skipanimation param
        lastexpanded={$header:$header, $content:$subcontent}
      }  //end check
      else{
        $subcontent.hide()
        config.onopenclose($header.get(0), parseInt($header.attr('headerindex')), $subcontent.css('display'), false) //Last Boolean value sets 'isuseractivated' parameter
        ddaccordion.transformHeader($header, config, "collapse")
      }
    })
    $headers.bind("evt_accordion", function(e, isdirectclick){ //assign CUSTOM event handler that expands/ contacts a header
        var $subcontent=$subcontents.eq(parseInt($(this).attr('headerindex'))) //get subcontent that should be expanded/collapsed
        if ($subcontent.css('display')=="none"){
          ddaccordion.expandit($(this), $subcontent, config, true, isdirectclick) //2nd last param sets 'isuseractivated' parameter
          if (config["collapseprev"] && lastexpanded.$header && $(this).get(0)!=lastexpanded.$header.get(0)){ //collapse previous content?
            ddaccordion.collapseit(lastexpanded.$header, lastexpanded.$content, config, true) //Last Boolean value sets 'isuseractivated' parameter
          }
          lastexpanded={$header:$(this), $content:$subcontent}
        }
        else if (!config["onemustopen"] || config["onemustopen"] && lastexpanded.$header && $(this).get(0)!=lastexpanded.$header.get(0)){
          ddaccordion.collapseit($(this), $subcontent, config, true) //Last Boolean value sets 'isuseractivated' parameter
        }
     })
    $headers.bind(config.revealtype, function(){
      if (config.revealtype=="mouseenter"){
        clearTimeout(config.revealdelay)
        var headerindex=parseInt($(this).attr("headerindex"))
        config.revealdelay=setTimeout(function(){ddaccordion.expandone(config["headerclass"], headerindex)}, config.mouseoverdelay || 0)
      }
      else{
        $(this).trigger("evt_accordion", [true]) //last parameter indicates this is a direct click on the header
        return false //cancel default click behavior
      }
    })
    $headers.bind("mouseleave", function(){
      clearTimeout(config.revealdelay)
    })
    config.oninit($headers.get(), expandedindices)
    $(window).bind('unload', function(){ //clean up and persist on page unload
      $headers.unbind()
      var expandedindices=[]
      $subcontents.filter(':visible').each(function(index){ //get indices of expanded headers
        expandedindices.push($(this).attr('contentindex'))
      })
      if (config.persiststate==true && $headers.length>0){ //persist state?
        expandedindices=(expandedindices.length==0)? '-1c' : expandedindices //No contents expanded, indicate that with dummy '-1c' value?
        ddaccordion.setCookie(config.headerclass, expandedindices)
      }
    })
  })
  }
}

//preload any images defined inside ajaxloadingmsg variable
ddaccordion.preloadimages(jQuery(ddaccordion.ajaxloadingmsg).filter('img'))