//Accordion Content script: By Dynamic Drive, at http://www.dynamicdrive.com
//Created: Jan 7th, 08'
//Version 1.3: April 3rd, 08':
//**1) Script now no longer conflicts with other JS frameworks
//**2) Adds custom oninit() and onopenclose() event handlers that fire when Accordion Content instance has initialized, plus whenever a header is opened/closed
//**3) Adds support for expanding header(s) using the URL parameter (ie: http://mysite.com/accordion.htm?headerclass=0,1)

//April 9th, 08': Fixed "defaultexpanded" setting not working when page first loads

//Version 1.4: June 4th, 08':
//**1) Added option to activate a header "mouseover" instead of the default "click"
//**2) Bug persistence not working when used with jquery 1.2.6

//Version 1.5: June 20th, 08':
//**1) Adds new "onemustopen:true/false" parameter, which lets you set whether at least one header should be open at all times (so never all closed).
//**2) Changed cookie path to site wide for persistence feature
//**3) Fixed bug so "expandedindices" parameter in oninit(headers, expandedindices) returns empty array [] instead of [-1] when no expanded headers found

//Version 1.5.1: June 27th, 08': Fixed "defaultexpanded" setting not working properly when used with jquery 1.2.6

var ddaccordion={

  contentclassname:{}, //object to store corresponding contentclass name based on headerclass

  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 $=jQuery
    var $headers=$('.'+headerclass)
    $('.'+this.contentclassname[headerclass]+':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 $=jQuery
    var $headers=$('.'+headerclass)
    $('.'+this.contentclassname[headerclass]+':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 $=jQuery
    var $targetHeader=$('.'+headerclass).eq(selected)
    var $subcontent=$('.'+this.contentclassname[headerclass]).eq(selected)
    if (typeof optstate=="undefined" || optstate=="expand" && $subcontent.is(":hidden") || optstate=="collapse" && $subcontent.is(":visible"))
      $targetHeader.trigger("evt_accordion")
  },

  expandit:function($targetHeader, $targetContent, config, useractivated){
    $targetContent.slideDown(config.animatespeed, function(){config.onopenclose($targetHeader.get(0), parseInt($targetHeader.attr('headerindex')), $targetContent.css('display'), useractivated)})
    this.transformHeader($targetHeader, config, "expand")
  },

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

  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('<\/style>')
  jQuery(document).ready(function($){
    ddaccordion.urlparamselect(config.headerclass)
    var persistedheaders=ddaccordion.getCookie(config.headerclass)
    ddaccordion.contentclassname[config.headerclass]=config.contentclass //remember contentclass name based on headerclass
    config.cssclass={collapse: config.toggleclass[0], expand: config.toggleclass[1]} //store expand and contract CSS classes as object properties
    config.revealtype=/^(click)|(mouseover)$/i.test(config.revealtype)? config.revealtype.replace(/mouseover/i, "mouseenter") : "click"
    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]
    var $subcontents=$('.'+config["contentclass"])
    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]
    $('.'+config["headerclass"]).each(function(index){ //loop through all headers
      if (/(prefix)|(suffix)/i.test(config.htmlsetting.location) && $(this).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)
      }
      $(this).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 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)
        if (config.animatedefault==false)
          $subcontent.show()
        ddaccordion.expandit($(this), $subcontent, config, false) //Last Boolean value sets 'isuseractivated' parameter
        lastexpanded={$header:$(this), $content:$subcontent}
      }  //end check
      else{
        $subcontent.hide()
        config.onopenclose($(this).get(0), parseInt($(this).attr('headerindex')), $subcontent.css('display'), false) //Last Boolean value sets 'isuseractivated' parameter
        ddaccordion.transformHeader($(this), config, "collapse")
      }
    })
    $('.'+config["headerclass"]).bind("evt_accordion", function(){ //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), $subcontent, config, true) //Last Boolean value sets 'isuseractivated' parameter
          if (config["collapseprev"] && lastexpanded.$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{
          ddaccordion.collapseit($(this), $subcontent, config, true) //Last Boolean value sets 'isuseractivated' parameter
        }
     })
    $('.'+config["headerclass"]).bind(config.revealtype, function(){
      if (config.revealtype=="mouseenter"){
        ddaccordion.expandone(config["headerclass"], parseInt($(this).attr("headerindex")))
      }
      else{
        $(this).trigger("evt_accordion")
        return false //cancel default click behavior
      }
    })
    config.oninit($('.'+config["headerclass"]).get(), expandedindices)
    $(window).bind('unload', function(){ //clean up and persist on page unload
      $('.'+config["headerclass"]).unbind()
      var expandedindices=[]
      $('.'+config["contentclass"]+":visible").each(function(index){ //get indices of expanded headers
        expandedindices.push($(this).attr('contentindex'))
      })
      if (config.persiststate==true){ //persist state?
        expandedindices=(expandedindices.length==0)? '-1c' : expandedindices //No contents expanded, indicate that with dummy '-1c' value?
        ddaccordion.setCookie(config.headerclass, expandedindices)
      }
    })
  })
  }
}