/* Horizontal Accordion script
* Created: Oct 27th, 2009. This notice must stay intact for usage 
* Author: Dynamic Drive at http://www.dynamicdrive.com/
* Visit http://www.dynamicdrive.com/ for full source code
*/


var haccordion={
    //customize loading message if accordion markup is fetched via Ajax:
    ajaxloadingmsg: '<div style="margin: 1em; font-weight: bold"><img src="images/ajaxloadr.gif" style="vertical-align: middle" /></div>',

    accordioninfo: {}, //class that holds config information of each haccordion instance

    expandli:function(accordionid, targetli){
        var config=haccordion.accordioninfo[accordionid]
        var $targetli=(typeof targetli=="number")? config.$targetlis.eq(targetli) : (typeof targetli=="string")? jQuery('#'+targetli) : jQuery(targetli)
        if (typeof config.$lastexpanded!="undefined") //targetli may be an index, ID string, or DOM reference to LI
            config.$lastexpanded.stop().animate({width:config.paneldimensions.peekw}, config.speed) //contract last opened content
        $targetli.stop().animate({width:$targetli.data('hpaneloffsetw')}, config.speed) //expand current content
        config.$lastexpanded=$targetli
    },


    urlparamselect:function(accordionid){
        var result=window.location.search.match(new RegExp(accordionid+"=(\\d+)", "i")) //check for "?accordionid=index" in URL
        if (result!=null)
            result=parseInt(RegExp.$1)+"" //return value as string so 0 doesn't test for false
        return result //returns null or index, where index is the desired selected hcontent index
    },

    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=/"
    },


    loadexternal:function($, config){ //function to fetch external page containing the entire accordion content markup
        var $hcontainer=$('#'+config.ajaxsource.container).html(this.ajaxloadingmsg)
        $.ajax({
            url: config.ajaxsource.path, //path to external content
            async: true,
            error:function(ajaxrequest){
                $hcontainer.html('Error fetching content.<br />Server Response: '+ajaxrequest.responseText)
            },
            success:function(content){
                $hcontainer.html(content)
                haccordion.init($, config)
            }
        })
    },


    init:function($, config){
            haccordion.accordioninfo[config.accordionid]=config //cache config info for this accordion
            var $targetlis=$('#'+config.accordionid).find('ul:eq(0) > li') //find top level LIs
            config.$targetlis=$targetlis
            config.selectedli=config.selectedli || [] //set default selectedli option
            config.speed=config.speed || "normal" //set default speed
            $targetlis.each(function(i){
                var $target=$(this).data('pos', i) //give each li an index #
                $target.data('hpaneloffsetw', $target.find('.hpanel:eq(0)').outerWidth()) //get offset width of each .hpanel DIV (config.dimensions.fullw + any DIV padding)
                $target.mouseenter(function(){
                        haccordion.expandli(config.accordionid, this)
                    config.$lastexpanded=$(this)
                })
                if (config.collapsecurrent){ //if previous content should be contracted when expanding current
                    $target.mouseleave(function(){
                        $(this).stop().animate({width:config.paneldimensions.peekw}, config.speed) //contract previous content
                    })
                }                
            }) //end $targetlis.each
            var selectedli=haccordion.urlparamselect(config.accordionid) || ((config.selectedli[1] && haccordion.getCookie(config.accordionid))? parseInt(haccordion.getCookie(config.accordionid)) : config.selectedli[0])
            selectedli=parseInt(selectedli)
            if (selectedli>=0 && selectedli<config.$targetlis.length){ //if selectedli index is within range
                config.$lastexpanded=$targetlis.eq(selectedli)
                config.$lastexpanded.css('width', config.$lastexpanded.data('hpaneloffsetw')) //expand selected li
            }
            $(window).bind('unload', function(){ //clean up and persist on page unload
                haccordion.uninit($, config)
            }) //end window.onunload
    },

    uninit:function($, config){
        var $targetlis=config.$targetlis
        var expandedliindex=-1 //index of expanded content to remember (-1 indicates non)
        $targetlis.each(function(){
            var $target=$(this)
            $target.unbind()
            if ($target.width()==$target.data('hpaneloffsetw'))
                expandedliindex=$target.data('pos')
        })
        if (config.selectedli[1]==true) //enable persistence?
            haccordion.setCookie(config.accordionid, expandedliindex)
    },

    setup:function(config){
        //Use JS to write out CSS that sets up initial dimensions of each LI, for JS enabled browsers only
        document.write('<style type="text/css">\n')
        document.write('#'+config.accordionid+' li{width: '+config.paneldimensions.peekw+';\nheight: '+config.paneldimensions.h+';\n}\n')
        document.write('#'+config.accordionid+' li .hpanel{width: '+config.paneldimensions.fullw+';\nheight: '+config.paneldimensions.h+';\n}\n')
        document.write('<\/style>')
        jQuery(document).ready(function($){ //on Dom load
            if (config.ajaxsource) //if config.ajaxsource option defined
                haccordion.loadexternal($, config)
            else
                haccordion.init($, config)
        }) //end DOM load
    }

}