Combined Thumbnail Viewer III & CMotion- need help making it random

**grassmeyer** · 06-15-2007, 11:48 PM

1) Script Title: Combined Thumbnail Viewer III (Ultimate Fade-In Slideshow v1.5 and Thumbnail Viewer II) & CMotion

2) Script URL (on DD):
http://www.dynamicdrive.com/dynamici...iongallery.htm
http://www.dynamicdrive.com/dynamici...nslideshow.htm
http://www.dynamicdrive.com/dynamici...thumbnail2.htm

3) Describe problem:
I need help making the large image random on page load.

Here's my code:

HTML Code:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">	
<html>
<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
 
<link rel="stylesheet" type="text/css" href="css/gallerystyle.css" />
<script type="text/javascript" src="motiongallery3.js">

/***********************************************
* CMotion Image Gallery- Copyright Dynamic Drive DHTML code library (www.dynamicdrive.com)
* Visit http://www.dynamicDrive.com for hundreds of DHTML scripts
* This notice must stay intact for legal use
***********************************************/

</script>
<script type="text/javascript">
/***********************************************
* Thumbnail Viewer III modified from
* Ultimate Fade-In Slideshow (v1.5) and Thumbnail Viewer II:
* both Copyright Dynamic Drive (http://www.dynamicdrive.com)
* modified by jscheuer1 in http://www.dynamicdrive.com/forums
* This notice MUST stay intact for legal use
* Visit http://www.dynamicdrive.com/ for this script and 100s more.
***********************************************/

var dynimages=new Array()
//SET IMAGE PATHS. Extend or contract array as needed
//"Thumnail for Gallery", "Large Image", "optional_link", "optional_target"
//link and target are for large image
dynimages[0]=["photos/console_th.jpg", "photos/console.jpg", "", ""] //plain image syntax
dynimages[1]=["photos/lights_th.jpg", "photos/lights.jpg", "", ""] //plain image syntax
dynimages[2]=["photos/rv_th.jpg", "photos/rv.jpg", "", ""] //plain image syntax
dynimages[3]=["photos/police_th.jpg", "photos/police.jpg", "", ""] //plain image syntax


var fadebgcolor="white"

////NO need to edit beyond here/////////////
var flag=1
var fadearray=new Array() //array to cache displayarea instances
var fadeclear=new Array() //array to cache corresponding clearinterval pointers

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

function displayarea(theimages, fadewidth, fadeheight, borderwidth){
this.pausecheck=0
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"
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][1]
}

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;filter:progid:DXImageTransform.Microsoft.alpha(opacity=100);-moz-opacity:1;-khtml-opacity:1;opacity:1;background-color:'+fadebgcolor+'"></div><div id="'+this.canvasbase+'_1" style="position:absolute;width:'+fadewidth+'px;height:'+fadeheight+'px;top:0;left:0;filter:progid:DXImageTransform.Microsoft.alpha(opacity=100);-moz-opacity:1;-khtml-opacity:1;opacity:1;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()", 100)
}
}

function fadepic(obj){
if (obj.degree<100){
if (obj.tempobj.filters&&obj.tempobj.filters[0]&&typeof obj.tempobj.ofilter=='undefined') obj.tempobj.ofilter=obj.tempobj.style.filter
obj.degree+=5
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 if (obj.tempobj.style.opacity&&!obj.tempobj.filters)
obj.tempobj.style.opacity=obj.degree/101
}
else{
if (obj.tempobj.filters&&obj.tempobj.filters[0]&&typeof obj.tempobj.ofilter!=='undefined') obj.tempobj.style.filter=null
clearInterval(fadeclear[obj.slideshowid])
obj.pausecheck=flag=1
}
}

displayarea.prototype.populateslide=function(picobj, picindex){
var slideHTML=""
if (this.theimages[picindex][2]!="") //if associated link exists for image
slideHTML='<a href="'+this.theimages[picindex][2]+'" target="'+this.theimages[picindex][3]+'">'
slideHTML+='<img src="'+this.postimages[picindex].src+'" border="'+this.imageborder+'px">'
if (this.theimages[picindex][2]!="") //if associated link exists for image
slideHTML+='</a>'
picobj.innerHTML=slideHTML
}


displayarea.prototype.rotateimage=function(){
var cacheobj=this
if (this.pausecheck==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
}

displayarea.prototype.resetit=function(){
this.degree=10
var crossobj=iebrowser? iebrowser[this.curcanvas] : document.getElementById(this.curcanvas)
if (crossobj.filters){ 
if (typeof crossobj.ofilter!=='undefined') 
crossobj.style.filter=crossobj.ofilter 
if(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=this.degree/100
else if (crossobj.style.opacity&&!crossobj.filters)
crossobj.style.opacity=this.degree/101
}


displayarea.prototype.startit=function(){
var crossobj=iebrowser? iebrowser[this.curcanvas] : document.getElementById(this.curcanvas)
this.populateslide(crossobj, this.curimageindex)
var cacheobj=this
this.rotateimage()
}

var wait
function switchFade(iNum, slideId){
var slideIdNum
if (typeof slideId=='number')
slideIdNum=slideId
else
for (var i_tem = 0; i_tem < fadearray.length; i_tem++)
if (fadearray[i_tem].theimages==slideId)
slideIdNum=i_tem
if (flag){
clearInterval(wait)
flag=0
clearInterval(fadeclear[slideIdNum])
fadearray[slideIdNum].pausecheck=0
fadearray[slideIdNum].nextimageindex=iNum
fadearray[slideIdNum].nextcanvas=(fadearray[slideIdNum].curcanvas==fadearray[slideIdNum].canvasbase+"_0")? fadearray[slideIdNum].canvasbase+"_0" : fadearray[slideIdNum].canvasbase+"_1"
fadearray[slideIdNum].tempobj=iebrowser? iebrowser[fadearray[slideIdNum].nextcanvas] : document.getElementById(fadearray[slideIdNum].nextcanvas)
fadearray[slideIdNum].populateslide(fadearray[slideIdNum].tempobj, fadearray[slideIdNum].nextimageindex)
setTimeout("fadearray["+slideIdNum+"].rotateimage()", 100)
}
else{
clearInterval(wait)
wait=setInterval("switchFade("+iNum+", "+slideIdNum+");", 100)
}
}

</script>
</head>

<body link="#d291d3" vlink="#d291d3" alink="#d291d3" style="margin:0px; padding:0px;">
<script type="text/javascript">
//new displayarea(IMAGES_ARRAY_NAME, images_width, images_height, borderwidth)
new displayarea(dynimages, 448, 299, 0)
</script>

<div style="overflow:hidden; height:98px; background-image:url(photos/images/arrows_03.gif); background-repeat:no-repeat; background-position:0px 35px;"><div id="motioncontainer" style="position:relative; width:432px; height:98px; overflow:hidden; left: 10px; top: 5px;">
<div id="motiongallery" style="position:absolute;left:0;top:0;white-space: nowrap;">
<script type="text/javascript">
document.write('<nobr id="trueContainer">')
for (var i_tem = 0; i_tem < dynimages.length; i_tem++)
document.write('<a href="javascript:switchFade('+[i_tem]+', dynimages)"><img src="'+dynimages[i_tem][0]+'" border="1"></a>')
document.write('</nobr>')
</script>
</div>
</div>
</div>

</body>
</html>

You can see it working here:
http://www.kdbco.com/gallery/

Everything functions like how I want it except I can't figure out how to make the large image that loads when the page is loaded or refreshed be random.

Any help will be appreciated, DD rocks!!

Jen

**grassmeyer** · 06-16-2007, 02:01 AM

After some trial and error with the code, I found that this is the line that specifies what image is displayed on pageload.

Code:

this.curimageindex=0

So I played around with some different math.random functions to get a random image.

See a great article here:
http://www.shawnolson.net/a/789/make...om-useful.html

Since I have 4 images 0 to 3, I used this code to come up with a random image:

Code:

this.curimageindex=Math.floor(Math.random() * (3 - 0 + 1) + 0)

This seems to work well, but if there is a better way let me know!

Thanks!

Jen

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