//** Drill Down Menu v1.0- (c) Dynamic Drive DHTML code library: http://www.dynamicdrive.com
//** Script Download/ instructions page: http://www.dynamicdrive.com/dynamicindex1/drilldownmenu.htm
//** June 8th, 2009: Script Creation date
//** June 10th, 2009: v1.01: Minor update

//Version 1.5: June 21st, 09':
//**1) Ability to include menu from external file and added to page via Ajax
//**2) Adds support for arbitrary links to act as "back buttons" for a drill menu. Just give the link a rel="drillback-menuid" attribute
//**3) Adds drillmenuinstance.back() method, which can be called on demand to go back one level within drill menu
//**4) Fixes bug with background ULs being visible following foreground UL contents
//**5) Updated css so browsers with JS disabled will get a scrolling, fixed height UL

//Version 1.6: August 9th, 09': Adds ability to specify explicit height for main menu, instead of defaulting to top UL's natural height.


function drilldownmenu(setting){
	this.sublevelarrow={src:'Images/right.gif', width:'8px', top:'3px', left:'6px'} //full URL to image used to indicate there's a sub level
	this.breadcrumbarrow='Images/right.gif' //full URL to image separating breadcrumb links (if it's defined)
	this.loadingimage='Images/loader.gif' //full URL to 'loading' image, if menu is loaded via Ajax
	this.homecrumbtext=setting.nombreSeccion //Top level crumb text
	this.titlelength=35 //length of parent LI text to extract from to use as crumb titles
	this.backarrow='Images/leftarrow.gif' //full URL to image added in front of back LI 

	////////// No need to edit beyond here /////////////
	this.menuid=setting.menuid
	this.$menudiv=null
	this.mainul=null
	this.$uls=null
	this.navdivs={}
	this.menuheight=setting.menuheight || 'auto'
	this.selectedul=setting.selectedul || null
	this.speed=setting.speed || 70
	this.persist=setting.persist || {enable: false, overrideselectedurl: false}
	this.$arrowimgs=null
	this.currentul=0
	this.filesetting=setting.filesetting || {url: null, targetElement: null}
	this.zIndexvalue=100
	this.arrowposx=0 //default arrow x position relative to parent LI
	var thisdrill=this
	jQuery.noConflict()	
	jQuery(document).ready(function($){


		if (thisdrill.filesetting.url && thisdrill.filesetting.url.length>0){ //menu defined inside external file (use Ajax)?
			var $dest=(typeof thisdrill.filesetting.targetElement=="string")? $('#'+thisdrill.filesetting.targetElement) : null
			if (!$dest || $dest.length!=1){ //if target element isn't defined or multiple targets found
				alert("Error: The target element \"" + thisdrill.filesetting.targetElement + "\" to add the menu into doesn't exist or is incorrectly specified.")
				return
			}
			$dest.html('<img src="'+thisdrill.loadingimage+'" style="vertical-align:middle" /> <b>Loading Drill Down Menu...</b>')
			$.ajax({
				url: thisdrill.filesetting.url,
				error:function(ajaxrequest){
					alert('Error fetching Ajax content.\nServer Response: '+ajaxrequest.responseText)
				}, //end error
				success:function(content){
					$dest.html(content)
					thisdrill.init($, setting)
				} //end success
			}) //end ajax
		}
		else{ //if inline menu
			thisdrill.init($, setting)
		}
	}) //end document.ready
}

drilldownmenu.prototype.init=function($, setting){
		var thisdrill=this
		var $maindiv=$('#'+setting.menuid).css({position:'relative'}) //relative position main DIV
		var $uls=$maindiv.find('ul')
		$uls.css({position:'absolute', left:0, top:0, visibility:'hidden'}) //absolutely position ULs
		this.$maindiv=$maindiv
		this.$uls=$uls
		this.navdivs.$crumb=$('#'+setting.breadcrumbid)
		this.navdivs.$backbuttons=$('a[rel^="drillback-'+setting.menuid+'"]').css({outline:'none'}).click(function(e){
			thisdrill.back()
			e.preventDefault()
		})
		this.buildmenu($)
		$(window).bind('unload', function(){
			thisdrill.uninit()
		})
		setting=null	
}

drilldownmenu.prototype.buildmenu = function ($) {
    var thisdrill = this

    this.$uls.each(function (i) { //loop through each UL
        var $thisul = $(this)
        if (i == 0) { //if topmost UL
            $('<li class="backcontroltitle">En esta secci&oacute;n</li>').prependTo($thisul).click(function (e) { e.preventDefault() })
            thisdrill.$maindiv.css({ height: (thisdrill.menuheight == 'auto') ? $thisul.outerHeight() : parseInt(thisdrill.menuheight), overflow: 'hidden' }) //set main menu DIV's height to top level UL's height
				.data('h', parseInt(thisdrill.$maindiv.css('height')))
                 
        }
        else { //if this isn't the topmost UL
            var $parentul = $thisul.parents('ul:eq(0)')
            var $parentli = $thisul.parents('li:eq(0)')
            $('<li class="backcontrol"><img src="' + thisdrill.backarrow + '" style="border-width:0" /> Volver atr&aacute;s</li>') //add back LI item
				.click(function (e) { thisdrill.back(); e.preventDefault() })
				.prependTo($thisul)
            var $anchorlink = $parentli.children('a:eq(0)').css({ outline: 'none' }).data('control', { order: i }) //remove outline from anchor links
            var $arrowimg = $('<img class="arrowclass" />').attr('src', thisdrill.sublevelarrow.src).css({ position: 'absolute', borderWidth: 0, paddingTop: thisdrill.sublevelarrow.top, left: $parentli.width() - parseInt(thisdrill.sublevelarrow.width) - parseInt(thisdrill.sublevelarrow.left) }).prependTo($anchorlink)
            $anchorlink.click(function (e) { //assign click behavior to anchor link
                thisdrill.slidemenu(jQuery(this).data('control').order)
                e.preventDefault()
            })

        }

        var ulheight = ($thisul.outerHeight() < thisdrill.$maindiv.data('h')) ? thisdrill.$maindiv.data('h') : 'auto'
        $thisul.css({ visibility: 'visible', width: '100%', height: ulheight, left: (i == 0) ? 'auto' : $parentli.outerWidth(), top: 0 })
        $thisul.data('specs', { w: $thisul.outerWidth(), h: $thisul.outerHeight(), order: i, parentorder: (i == 0) ? -1 : $anchorlink.parents('ul:eq(0)').data('specs').order, x: (i == 0) ? $thisul.position().left : $parentul.data('specs').x + $parentul.data('specs').w, title: (i == 0) ? thisdrill.homecrumbtext : $parentli.find('a:eq(0)').text().substring(0, thisdrill.titlelength) })
    }) //end UL loop
    var selectedulcheck = this.selectedul && document.getElementById(this.selectedul) //check if "selectedul" defined, plus if actual element exists
    this.$arrowimgs = this.$maindiv.find('img.arrowclass')
    this.arrowposx = parseInt(this.$arrowimgs.eq(0).css('left')) //get default x position of arrow
    if (window.opera)
        this.$uls.eq(0).css({ zIndex: this.zIndexvalue }) //Opera seems to require this in order for top level arrows to show
    if (this.persist.enable && (this.persist.overrideselectedul || !this.persist.overrideselectedul && !selectedulcheck) && drilldownmenu.routines.getCookie(this.menuid)) { //go to last persisted UL?
        var ulorder = parseInt(drilldownmenu.routines.getCookie(this.menuid))
        this.slidemenu(ulorder, true)
    }
    else if (selectedulcheck) { //if "selectedul" setting defined, slide to that UL by default
        var ulorder = $('#' + this.selectedul).data('specs').order
        this.slidemenu(ulorder, true)
    }
    else {
        this.slidemenu(0, true)
    }
    this.navdivs.$crumb.click(function (e) { //assign click behavior to breadcrumb div
        if (e.target.tagName == "A") {
            var order = parseInt(e.target.getAttribute('rel'))
            if (!isNaN(order)) { //check link contains a valid rel attribute int value (is anchor link)
                thisdrill.slidemenu(order)
                e.preventDefault()
            }
        }
    })
}

drilldownmenu.prototype.slidemenu=function(order, disableanimate){
	var order=isNaN(order)? 0 : order
	this.$uls.css({display: 'none'})
	var $targetul=this.$uls.eq(order).css({zIndex: this.zIndexvalue++})
	$targetul.parents('ul').andSelf().css({display: 'block'})
	this.currentul=order
	if ($targetul.data('specs').h > this.$maindiv.data('h')){
		this.$maindiv.css({overflowY:'auto'}).scrollTop(0)
		this.$arrowimgs.css('left', this.arrowposx-15) //adjust arrow position if scrollbar is added
	}
	else{
		this.$maindiv.css({overflowY: 'hidden'}).scrollTop(0)
		this.$arrowimgs.css('left', this.arrowposx)
	}
	this.updatenav($, order)
	this.$uls.eq(0).animate({left:-$targetul.data('specs').x}, typeof disableanimate!="undefined"? 0 : this.speed)
}

drilldownmenu.prototype.back=function(){
	if (this.currentul>0){
		var order=this.$uls.eq(this.currentul).parents('ul:eq(0)').data('specs').order
		this.slidemenu(order)
	}
}

drilldownmenu.prototype.updatenav=function($, endorder){
	var $currentul=this.$uls.eq(endorder)
	if (this.navdivs.$crumb.length==1){ //if breadcrumb div defined
		var $crumb=this.navdivs.$crumb.empty()
		if (endorder>0){ //if this isn't the topmost UL (no point in showing crumbs if it is)
			var crumbhtml=''
			while ($currentul && $currentul.data('specs').order>=0){
				crumbhtml=' <img src="'+this.breadcrumbarrow+'" /> <a href="#nav" rel="'+$currentul.data('specs').order+'">'+$currentul.data('specs').title+'</a>'+crumbhtml
				$currentul=($currentul.data('specs').order>0)? this.$uls.eq($currentul.data('specs').parentorder) : null
			}
			$crumb.append(crumbhtml).find('img:eq(0)').remove().end().find('a:last').replaceWith(this.$uls.eq(endorder).data('specs').title) //remove link from very last crumb trail
		}
		else{
			$crumb.append(this.homecrumbtext)
		}
	}
	if (this.navdivs.$backbuttons.length>0){ //if back buttons found
		if	(!/Safari/i.test(navigator.userAgent)) //exclude Safari from button state toggling due to bug when the button is an image link
			this.navdivs.$backbuttons.css((endorder>0)? {opacity:1, cursor:'pointer'} : {opacity:0.5, cursor:'default'})
	}
}

drilldownmenu.prototype.uninit=function(){
	if (this.persist.enable)
		drilldownmenu.routines.setCookie(this.menuid, this.currentul)
}

drilldownmenu.routines={

	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=/"
	}

}