ASP.NET MVC3 Slideshow Control using jQuery and XML

//** Simple Controls Gallery- (c) Dynamic Drive DHTML code library: http://www.dynamicdrive.com
//** Dec 7th, 08'- Script created (Requires jquery 1.2.x)
//** February 6th, 09'- Updated to v 1.3:
//1) Adds Description Panel to optionally show a textual description for each slide
//2) In Auto Play mode, you can now set the number of cycles before gallery stops.
//3) Inside oninit() and onslide(), keyword "this" now references the current gallery instance

var simpleGallery_navpanel = {
    panel: { height: '20%', opacity: 0.5, paddingTop: '3px', fontStyle: 'bold 11px Verdana' }, //customize nav panel container
    images: ['http://images.ysatech.com/ads/previous.gif', 'http://images.ysatech.com/ads/play.gif', 'http://images.ysatech.com/ads/next.gif', 'http://images.ysatech.com/ads/pause.gif'], //nav panel images (in that order)
    imageSpacing: { offsetTop: [-2, -2, -2], spacing: 10 }, //top offset of left, play, and right images, PLUS spacing between the 3 images
    slideduration: 500 //duration of slide up animation to reveal panel
}

function simpleGallery(settingarg) {
    this.setting = settingarg
    settingarg = null
    var setting = this.setting

    // hide the panel by setting the height =0
    var panelHeight = simpleGallery_navpanel.panel.height;

    if (setting.showpanel === 'false') {
        panelHeight = "0px";
    }
    
    setting.panelheight = (parseInt(setting.navpanelheight) > 5) ? parseInt(setting.navpanelheight) : parseInt(panelHeight)
    setting.fadeduration = parseInt(setting.fadeduration)
    setting.curimage = (setting.persist) ? simpleGallery.routines.getCookie("gallery-" + setting.wrapperid) : 0
    setting.curimage = setting.curimage || 0 //account for curimage being null if cookie is empty
    setting.ispaused = !setting.autoplay[0] //ispaused reflects current state of gallery, autoplay[0] indicates whether gallery is set to auto play
    setting.currentstep = 0 //keep track of # of slides slideshow has gone through
    setting.totalsteps = setting.imagearray.length * setting.autoplay[2] //Total steps limit: # of images x # of user specified cycles
    setting.fglayer = 0, setting.bglayer = 1 //index of active and background layer (switches after each change of slide)
    setting.oninit = setting.oninit || function() { }
    setting.onslide = setting.onslide || function() { }
    var preloadimages = [], longestdesc = null //preload images
    setting.longestdesc = "" //get longest description of all slides. If no desciptions defined, variable contains ""
    for (var i = 0; i < setting.imagearray.length; i++) {
        preloadimages[i] = new Image()
        preloadimages[i].src = setting.imagearray[i][0]
        if (setting.imagearray[i][3] && setting.imagearray[i][3].length > setting.longestdesc.length)
            setting.longestdesc = setting.imagearray[i][3]
    }
    var slideshow = this
    jQuery(document).ready(function($) {
        var setting = slideshow.setting
        setting.$wrapperdiv = $('#' + setting.wrapperid).css({ position: 'relative', visibility: 'visible', background: 'white', overflow: 'hidden', width: setting.dimensions[0], height: setting.dimensions[1] }).empty() //main gallery DIV
        if (setting.$wrapperdiv.length == 0) { //if no wrapper DIV found
            alert("Error: DIV with ID \"" + setting.wrapperid + "\" not found on page.")
            return
        }
        setting.$gallerylayers = $('<div class="gallerylayer"></div><div class="gallerylayer"></div>') //two stacked DIVs to display the actual slide 
			.css({ position: 'absolute', left: 0, top: 0 })
			.appendTo(setting.$wrapperdiv)
        setting.gallerylayers = setting.$gallerylayers.get() //cache stacked DIVs as DOM objects
        setting.navbuttons = simpleGallery.routines.addnavpanel(setting) //get 4 nav buttons DIVs as DOM objects
        if (setting.longestdesc != "") //if at least one slide contains a description (feature is enabled)
            setting.descdiv = simpleGallery.routines.adddescpanel(setting)
        $(setting.navbuttons).filter('img.navimages').css({ opacity: 0.8 })
			.bind('mouseover mouseout', function(e) {
			    $(this).css({ opacity: (e.type == "mouseover") ? 1 : 0.8 })
			})
			.bind('click', function(e) {
			    var keyword = e.target.title.toLowerCase()
			    slideshow.navigate(keyword) //assign behavior to nav images
			})
        setting.$wrapperdiv.bind('mouseenter', function() { slideshow.showhidenavpanel('show') })
        setting.$wrapperdiv.bind('mouseleave', function() { slideshow.showhidenavpanel('hide') })
        slideshow.showslide(setting.curimage) //show initial slide
        setting.oninit.call(slideshow) //trigger oninit() event
        $(window).bind('unload', function() { //clean up and persist
            $(slideshow.setting.navbuttons).unbind()
            if (slideshow.setting.persist) //remember last shown image's index
                simpleGallery.routines.setCookie("gallery-" + setting.wrapperid, setting.curimage)
            jQuery.each(slideshow.setting, function(k) {
                if (slideshow.setting[k] instanceof Array) {
                    for (var i = 0; i < slideshow.setting[k].length; i++) {
                        if (slideshow.setting[k][i].tagName == "DIV") //catches 2 gallerylayer divs, gallerystatus div
                            slideshow.setting[k][i].innerHTML = null
                        slideshow.setting[k][i] = null
                    }
                }
                if (slideshow.setting[k].innerHTML) //catch gallerydesctext div
                    slideshow.setting[k].innerHTML = null
                slideshow.setting[k] = null
            })
            slideshow = slideshow.setting = null
        })
    })
}

simpleGallery.prototype = {

    navigate: function(keyword) {
        clearTimeout(this.setting.playtimer)
        this.setting.totalsteps = 100000 //if any of the nav buttons are clicked on, set totalsteps limit to an "unreachable" number 
        if (!isNaN(parseInt(keyword))) {
            this.showslide(parseInt(keyword))
        }
        else if (/(prev)|(next)/i.test(keyword)) {
            this.showslide(keyword.toLowerCase())
        }
        else { //if play|pause button
            var slideshow = this
            var $playbutton = $(this.setting.navbuttons).eq(1)
            if (!this.setting.ispaused) { //if pause Gallery
                this.setting.autoplay[0] = false
                //alert(this.setting.navimages[1]);
                $playbutton.attr({ title: 'Play', src: this.setting.navimages[1] })
                //  $playbutton.attr({ title: 'Play', src: simpleGallery_navpanel.images[1] })
            }
            else if (this.setting.ispaused) { //if play Gallery
                //  alert(this.setting.navimages[1]);
                this.setting.autoplay[0] = true
                this.setting.playtimer = setTimeout(function() { slideshow.showslide('next') }, this.setting.autoplay[1])
                $playbutton.attr({ title: 'Pause', src: this.setting.navimages[3] })
                //  $playbutton.attr({ title: 'Pause', src: simpleGallery_navpanel.images[3] })
            }
            slideshow.setting.ispaused = !slideshow.setting.ispaused
        }
    },

    showslide: function(keyword) {
        var slideshow = this
        var setting = slideshow.setting
        var totalimages = setting.imagearray.length

       // alert(totalimages);


        var imgindex = (keyword == "next") ? (setting.curimage < totalimages - 1 ? setting.curimage + 1 : 0)
			: (keyword == "prev") ? (setting.curimage > 0 ? setting.curimage - 1 : totalimages - 1)
			: Math.min(keyword, totalimages - 1)
        setting.gallerylayers[setting.bglayer].innerHTML = simpleGallery.routines.getSlideHTML(setting.imagearray[imgindex])
        setting.$gallerylayers.eq(setting.bglayer).css({ zIndex: 1000, opacity: 0 }) //background layer becomes foreground
			.stop().css({ opacity: 0 }).animate({ opacity: 1 }, setting.fadeduration, function() { //Callback function after fade animation is complete:
			    clearTimeout(setting.playtimer)
			    setting.gallerylayers[setting.bglayer].innerHTML = null  //empty bglayer (previously fglayer before setting.fglayer=setting.bglayer was set below)
			    try {
			        setting.onslide.call(slideshow, setting.gallerylayers[setting.fglayer], setting.curimage)
			    } catch (e) {
			        alert("Simple Controls Gallery: An error has occured somwhere in your code attached to the \"onslide\" event: " + e)
			    }
			    setting.currentstep += 1
			    if (setting.autoplay[0]) {
			        if (setting.currentstep <= setting.totalsteps)
			            setting.playtimer = setTimeout(function() { slideshow.showslide('next') }, setting.autoplay[1])
			        else
			            slideshow.navigate("play/pause")
			    }
			}) //end callback function
        setting.gallerylayers[setting.fglayer].style.zIndex = 999 //foreground layer becomes background
        setting.fglayer = setting.bglayer
        setting.bglayer = (setting.bglayer == 0) ? 1 : 0
        setting.curimage = imgindex
        setting.navbuttons[3].innerHTML = (setting.curimage + 1) + '/' + setting.imagearray.length
        if (setting.imagearray[imgindex][3]) { //if this slide contains a description
            setting.$descpanel.css({ visibility: 'visible' })

            //hide desc text
            setting.descdiv.innerHTML = setting.imagearray[imgindex][3]
            if (setting.showpanel === 'false') {
                setting.$descpanel.css({ visibility: 'hidden' })
            }
        }
        else if (setting.longestdesc != "") { //if at least one slide contains a description (feature is enabled)
            setting.descdiv.innerHTML = null
            setting.$descpanel.css({ visibility: 'hidden' })

        }
    },

    showhidenavpanel: function(state) {
        var setting = this.setting
        var endpoint = (state == "show") ? setting.dimensions[1] - setting.panelheight : this.setting.dimensions[1]
        setting.$navpanel.stop().animate({ top: endpoint }, simpleGallery_navpanel.slideduration)
        if (setting.longestdesc != "") //if at least one slide contains a description (feature is enabled)
            this.showhidedescpanel(state)
    },

    showhidedescpanel: function(state) {
        var setting = this.setting
        var endpoint = (state == "show") ? 0 : -setting.descpanelheight
        setting.$descpanel.stop().animate({ top: endpoint }, simpleGallery_navpanel.slideduration)
    }
}

simpleGallery.routines = {

//add alternate text
    getSlideHTML: function(imgelement) {
    var layerHTML = (imgelement[1]) ? '<a href="' + imgelement[1] + '" target="' + imgelement[2] + '">\n' : '' //hyperlink slide?
    layerHTML += '<img title="' + imgelement[3] + '" alt="' + imgelement[3] + '"  src="' + imgelement[0] + '" style="border-width:0" />'
        layerHTML += (imgelement[1]) ? '</a>' : ''
        return layerHTML //return HTML for this layer
    },

    addnavpanel: function(setting) {
        var interfaceHTML = ''
        var myTop = simpleGallery_navpanel.imageSpacing.offsetTop[i];
        for (var i = 0; i < 3; i++) {
            //  alert(setting.navimages[i]);
          /*
            var imgstyle = 'position:relative; border:0; cursor:hand; cursor:pointer; top:' + simpleGallery_navpanel.imageSpacing.offsetTop[i] + 'px; margin-right:' + (i != 2 ? simpleGallery_navpanel.imageSpacing.spacing + 'px' : 0)
            var title = (i == 0 ? 'Prev' : (i == 1) ? (setting.ispaused ? 'Play' : 'Pause') : 'Next')
            var imagesrc = (i == 1) ? simpleGallery_navpanel.images[(setting.ispaused) ? 1 : 3] : simpleGallery_navpanel.images[i]
            interfaceHTML += '<img class="navimages" title="' + title + '" src="' + imagesrc + '" style="' + imgstyle + '" /> '
            */

            var imgstyle = 'position:relative; border:0; cursor:hand; cursor:pointer; top:' + simpleGallery_navpanel.imageSpacing.offsetTop[i] + 'px; margin-right:' + (i != 2 ? simpleGallery_navpanel.imageSpacing.spacing + 'px' : 0)
            var title = (i == 0 ? 'Prev' : (i == 1) ? (setting.ispaused ? 'Play' : 'Pause') : 'Next')
            var imagesrc = (i == 1) ? setting.navimages[(setting.ispaused) ? 1 : 3] : setting.navimages[i]
            interfaceHTML += '<img class="navimages" title="' + title + '" src="' + imagesrc + '" style="' + imgstyle + '" /> '
            
            //  alert(imgstyle);
        }

        interfaceHTML += '<div class="gallerystatus" style="position:absolute; top:-2px; right:0px; width:50px;">' + (setting.curimage + 1) + '/' + setting.imagearray.length + '</div>'
        setting.$navpanel = $('<div class="navpanellayer"></div>')
			.css({ position: 'absolute', width: '100%', height: setting.panelheight, left: 0, top: setting.dimensions[1], font: simpleGallery_navpanel.panel.fontStyle, zIndex: '1001' })
			.appendTo(setting.$wrapperdiv)
        $('<div class="navpanelbg"></div><div class="navpanelfg"></div>') //create inner nav panel DIVs
			.css({ position: 'absolute', left: 0, top: 0, width: '100%', height: '90%' })
			.eq(0).css({ background: 'white', opacity: simpleGallery_navpanel.panel.opacity }).end() //"navpanelbg" div
			.eq(1).css({ paddingTop: simpleGallery_navpanel.panel.paddingTop, textAlign: 'center', color: 'blue' }).html(interfaceHTML).end() //"navpanelfg" div
			.appendTo(setting.$navpanel)
        return setting.$navpanel.find('img.navimages, div.gallerystatus').get() //return 4 nav related images and DIVs as DOM objects
    },
    //description
    adddescpanel: function(setting) {
        setting.$descpanel = $('<div class="gallerydesc"><div class="gallerydescbg"></div><div class="gallerydescfg"><div class="gallerydesctext"></div></div></div>')
			.css({ position: 'absolute', width: '100%', left: 0, top: -1000, zIndex: '1001' })
			.find('div').css({ position: 'absolute', left: 0, top: 0, width: '100%' })
			.eq(0).css({ background: 'white', opacity: simpleGallery_navpanel.panel.opacity }).end() //"gallerydescbg" div
			.eq(1).css({ color: '#000099' }).end() //"gallerydescfg" div
			.eq(2).html(setting.longestdesc).end().end()
			.appendTo(setting.$wrapperdiv)

        var $gallerydesctext = setting.$descpanel.find('div.gallerydesctext')
        
        //hide des panel
        setting.descpanelheight = $gallerydesctext.outerHeight()
        if (setting.showpanel === 'false') {
            setting.$descpanel.css({ visibility: 'hidden' })
        }
        setting.$descpanel.css({ top: -setting.descpanelheight, height: setting.descpanelheight }).find('div').css({ height: '100%' })

        return setting.$descpanel.find('div.gallerydesctext').get(0) //return gallery description DIV as a DOM object

    },

    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=/"
    }
}