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  1. #1
    Regular Coder
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    preloading an array

    I found this script online, I just can't tell whether it preloads the array. I think lines 42 though 45 handle the preload, but can someone who actually understands javascript confirm this?
    [CODE]// JavaScript Document
    /***********************************************
    * Ultimate Fade-In Slideshow (v1.5): Dynamic Drive (http://www.dynamicdrive.com)
    * This notice MUST stay intact for legal use
    * Visit http://www.dynamicdrive.com/ for this script and 100s more.
    * http://www.dynamicdrive.com/dynamicindex14/fadeinslideshow.htm
    ***********************************************/

    var fadeimages=new Array()
    //SET IMAGE PATHS. Extend or contract array as needed
    fadeimages[0]=["images//slideshow/wide_steps.jpg", "directions.html", ""]
    fadeimages[1]=["images//slideshow/wide_archie.jpg", "accommodations.html", ""]
    fadeimages[2]=["images/slideshow/wide_flora.jpg", "contact.html", ""]
    fadeimages[3]=["images/slideshow/wide_cottage.jpg", "accommodations.html", ""]
    fadeimages[4]=["images/slideshow/wide_stream1.jpg", "directions.html", ""]

    var fadebgcolor="#ffffff"

    ////NO need to edit beyond here/////////////

    var fadearray=new Array() //array to cache fadeshow instances
    var fadeclear=new Array() //array to cache corresponding clearinterval pointers

    var dom=(document.getElementById) //modern dom browsers
    var iebrowser=document.all

    function fadeshow(theimages, fadewidth, fadeheight, borderwidth, delay, pause, displayorder){
    this.pausecheck=pause
    this.mouseovercheck=0
    this.delay=delay
    this.degree=10 //initial opacity degree (10%)
    this.curimageindex=0
    this.nextimageindex=1
    fadearray[fadearray.length]=this
    this.slideshowid=fadearray.length-1
    this.canvasbase="canvas"+this.slideshowid
    this.curcanvas=this.canvasbase+"_0"
    if (typeof displayorder!="undefined")
    theimages.sort(function() {return 0.5 - Math.random();}) //thanks to Mike (aka Mwinter)
    this.theimages=theimages
    this.imageborder=parseInt(borderwidth)
    this.postimages=new Array() //preload images
    for (p=0;p<theimages.length;p++){
    this.postimages[p]=new Image()
    this.postimages[p].src=theimages[p][0]
    }

    var fadewidth=fadewidth+this.imageborder*2
    var fadeheight=fadeheight+this.imageborder*2

    if (iebrowser&&dom||dom) //if IE5+ or modern browsers (ie: Firefox)
    document.write('<div id="master'+this.slideshowid+'" style="position:relative;width:'+fadewidth+'px;height:'+fadeheight+'px;overflow:hidden;"><div id="'+this.canvasbase+'_0" style="position:absolute;width:'+fadewidth+'px;height:'+fadeheight+'px;top:0;left:0;filterrogidXImageTransform.Microsoft.alpha(opacity=10);-moz-opacity:10;-khtml-opacity:10;background-color:'+fadebgcolor+'"></div><div id="'+this.canvasbase+'_1" style="position:absolute;width:'+fadewidth+'px;height:'+fadeheight+'px;top:0;left:0;filterrogidXImageTransform.Microsoft.alpha(opacity=10);-moz-opacity:10;background-color:'+fadebgcolor+'"></div></div>')
    else
    document.write('<div><img name="defaultslide'+this.slideshowid+'" src="'+this.postimages[0].src+'"></div>')

    if (iebrowser&&dom||dom) //if IE5+ or modern browsers such as Firefox
    this.startit()
    else{
    this.curimageindex++
    setInterval("fadearray["+this.slideshowid+"].rotateimage()", this.delay)
    }
    }

    function fadepic(obj){
    if (obj.degree<100){
    obj.degree+=6
    if (obj.tempobj.filters&&obj.tempobj.filters[0]){
    if (typeof obj.tempobj.filters[0].opacity=="number") //if IE6+
    obj.tempobj.filters[0].opacity=obj.degree
    else //else if IE5.5-
    obj.tempobj.style.filter="alpha(opacity="+obj.degree+")"
    }
    else if (obj.tempobj.style.MozOpacity)
    obj.tempobj.style.MozOpacity=obj.degree/101
    else if (obj.tempobj.style.KhtmlOpacity)
    obj.tempobj.style.KhtmlOpacity=obj.degree/100
    }
    else{
    clearInterval(fadeclear[obj.slideshowid])
    obj.nextcanvas=(obj.curcanvas==obj.canvasbase+"_0")? obj.canvasbase+"_0" : obj.canvasbase+"_1"
    obj.tempobj=iebrowser? iebrowser[obj.nextcanvas] : document.getElementById(obj.nextcanvas)
    obj.populateslide(obj.tempobj, obj.nextimageindex)
    obj.nextimageindex=(obj.nextimageindex<obj.postimages.length-1)? obj.nextimageindex+1 : 0
    setTimeout("fadearray["+obj.slideshowid+"].rotateimage()", obj.delay)
    }
    }

    fadeshow.prototype.populateslide=function(picobj, picindex){
    var slideHTML=""
    if (this.theimages[picindex][1]!="") //if associated link exists for image
    slideHTML='<a href="'+this.theimages[picindex][1]+'" target="'+this.theimages[picindex][2]+'">'
    slideHTML+='<img src="'+this.postimages[picindex].src+'" border="'+this.imageborder+'px">'
    if (this.theimages[picindex][1]!="") //if associated link exists for image
    slideHTML+='</a>'
    picobj.innerHTML=slideHTML
    }


    fadeshow.prototype.rotateimage=function(){
    if (this.pausecheck==1) //if pause onMouseover enabled, cache object
    var cacheobj=this
    if (this.mouseovercheck==1)
    setTimeout(function(){cacheobj.rotateimage()}, 100)
    else if (iebrowser&&dom||dom){
    this.resetit()
    var crossobj=this.tempobj=iebrowser? iebrowser[this.curcanvas] : document.getElementById(this.curcanvas)
    crossobj.style.zIndex++
    fadeclear[this.slideshowid]=setInterval("fadepic(fadearray["+this.slideshowid+"])",50)
    this.curcanvas=(this.curcanvas==this.canvasbase+"_0")? this.canvasbase+"_1" : this.canvasbase+"_0"
    }
    else{
    var ns4imgobj=document.images['defaultslide'+this.slideshowid]
    ns4imgobj.src=this.postimages[this.curimageindex].src
    }
    this.curimageindex=(this.curimageindex<this.postimages.length-1)? this.curimageindex+1 : 0
    }

    fadeshow.prototype.resetit=function(){
    this.degree=10
    var crossobj=iebrowser? iebrowser[this.curcanvas] : document.getElementById(this.curcanvas)
    if (crossobj.filters&&crossobj.filters[0]){
    if (typeof crossobj.filters[0].opacity=="number") //if IE6+
    crossobj.filters(0).opacity=this.degree
    else //else if IE5.5-
    crossobj.style.filter="alpha(opacity="+this.degree+")"
    }
    else if (crossobj.style.MozOpacity)
    crossobj.style.MozOpacity=this.degree/101
    else if (crossobj.style.KhtmlOpacity)
    crossobj.style.KhtmlOpacity=obj.degree/100
    }


    fadeshow.prototype.startit=function(){
    var crossobj=iebrowser? iebrowser[this.curcanvas] : document.getElementById(this.curcanvas)
    this.populateslide(crossobj, this.curimageindex)
    if (this.pausecheck==1){ //IF SLIDESHOW SHOULD PAUSE ONMOUSEOVER
    var cacheobj=this
    var crossobjcontainer=iebrowser? iebrowser["master"+this.slideshowid] : document.getElementById("master"+this.slideshowid)
    crossobjcontainer.onmouseover=function(){cacheobj.mouseovercheck=1}
    crossobjcontainer.onmouseout=function(){cacheobj.mouseovercheck=0}
    }
    this.rotateimage()
    }
    Outside of a dog, a book is man's best friend. Inside of a dog it's too dark to read. Groucho Marx

  • #2
    Senior Coder shyam's Avatar
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    yup it does
    You never have to change anything you got up in the middle of the night to write. -- Saul Bellow

  • #3
    Regular Coder
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    thank you. : )
    Outside of a dog, a book is man's best friend. Inside of a dog it's too dark to read. Groucho Marx


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