//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)
			}
		})
	})
	}
}