understand Translucent scroller

**dukevn** · 07-15-2008, 10:04 PM

1) Script Title: Translucent scroller

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

3) Describe problem:

I am playing with Translucent scroller, and I want to modify it a little so that the div ID can be controllable: I can put any name for it. I go ahead, create a new variable var divid = "divid", var divhidden="divhidden" and then change the corresponding "canvas0" and "canvas1" value to divid and divhidden.

Code:

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>translucent ticker</title>
</head>
<body>
<script language="JavaScript1.2">

//Translucent scroller- By Dynamic Drive
//For full source code and more DHTML scripts, visit http://www.dynamicdrive.com
//This credit MUST stay intact for use

// added variables
var divid='divid'
var divhidden='divhidden'

var scroller_width='150px'
var scroller_height='115px'
var bgcolor='#E0EFD1'
var pause=3000 //SET PAUSE BETWEEN SLIDE (3000=3 seconds)

var scrollercontent=new Array()
//Define scroller contents. Extend or contract array as needed
scrollercontent[0]='Visit our partner site <a href="http://freewarejava.com">Freewarejava.com </a>for free Java applets!'
scrollercontent[1]='Got JavaScript? <a href="http://www.javascriptkit.com">JavaScript Kit</a> is the most comprehensive JavaScript site online.'
scrollercontent[2]='Link to Dynamic Drive on your site. Please visit our <a href="http://www.dynamicdrive.com/link.htm">links page</a>.'


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

var ie4=document.all
var dom=document.getElementById&&navigator.userAgent.indexOf("Opera")==-1

if (ie4||dom)
document.write('<div style="position:relative;width:'+scroller_width+';height:'+scroller_height+';overflow:hidden"><div id="'+divid+'" style="position:absolute;background-color:'+bgcolor+';width:'+scroller_width+';height:'+scroller_height+';top:'+scroller_height+';filter:alpha(opacity=20);-moz-opacity:0.2;"></div><div id="'+divhidden+'" style="position:absolute;background-color:'+bgcolor+';width:'+scroller_width+';height:'+scroller_height+';top:'+scroller_height+';filter:alpha(opacity=20);-moz-opacity:0.2;"></div></div>')
else if (document.layers){
document.write('<ilayer id=tickernsmain visibility=hide width='+scroller_width+' height='+scroller_height+' bgColor='+bgcolor+'><layer id=tickernssub width='+scroller_width+' height='+scroller_height+' left=0 top=0>'+scrollercontent[0]+'</layer></ilayer>')
}

var curpos=scroller_height*(1)
var degree=10
var curcanvas=divid
var curindex=0
var nextindex=1

function moveslide(){
if (curpos>0){
curpos=Math.max(curpos-degree,0)
tempobj.style.top=curpos+"px"
}
else{
clearInterval(dropslide)
if (crossobj.filters)
crossobj.filters.alpha.opacity=100
else if (crossobj.style.MozOpacity)
crossobj.style.MozOpacity=1
nextcanvas=(curcanvas==divid)? divid : divhidden
tempobj=ie4? eval("document.all."+nextcanvas) : document.getElementById(nextcanvas)
tempobj.innerHTML=scrollercontent[curindex]
nextindex=(nextindex<scrollercontent.length-1)? nextindex+1 : 0
setTimeout("rotateslide()",pause)
}
}

function rotateslide(){
if (ie4||dom){
resetit(curcanvas)
crossobj=tempobj=ie4? eval("document.all."+curcanvas) : document.getElementById(curcanvas)
crossobj.style.zIndex++
if (crossobj.filters)
document.all.divid.filters.alpha.opacity=document.all.divhidden.filters.alpha.opacity=20
else if (crossobj.style.MozOpacity)
document.getElementById(divid).style.MozOpacity=document.getElementById(divhidden).style.MozOpacity=0.2
var temp='setInterval("moveslide()",50)'
dropslide=eval(temp)
curcanvas=(curcanvas==divid)? divhidden : divid
}
else if (document.layers){
crossobj.document.write(scrollercontent[curindex])
crossobj.document.close()
}
curindex=(curindex<scrollercontent.length-1)? curindex+1 : 0
}

function resetit(what){
curpos=parseInt(scroller_height)*(1)
var crossobj=ie4? eval("document.all."+what) : document.getElementById(what)
crossobj.style.top=curpos+"px"
}

function startit(){
crossobj=ie4? eval("document.all."+curcanvas) : dom? document.getElementById(curcanvas) : document.tickernsmain.document.tickernssub
if (ie4||dom){
crossobj.innerHTML=scrollercontent[curindex]
rotateslide()
}
else{
document.tickernsmain.visibility='show'
curindex++
setInterval("rotateslide()",pause)
}
}

if (ie4||dom||document.layers)
window.onload=startit

</script>
</body>
</html>

So far, the code works when I tried with FF3, Safari3, IE7. I do not have older browsers to test whether it still works or not. One thing I am not sure when making modification the code, is the line marked red. Originally the line contains the name of the div, and I modified it with the variables. Did I do it right? If not, what should I have changed to?

Thanks,

D.

**ddadmin** · 07-16-2008, 03:01 AM

The line in red is incorrect, it should be:

Code:

document.all[divid].filters.alpha.opacity=document.all[divhidden].filters.alpha.opacity=20

With that change script works for me in IE7 and FF3.

**dukevn** · 07-16-2008, 03:27 AM

Ah, got it now. Thanks ddadmin.

D.

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