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View Full Version : Probelms with onload event handler



eternal student
09-25-2003, 06:21 PM
I hope someone can find the problem with this....

I have two scripts running on the same page - the only problem is the onload event handler does not seem to be working correctly - although I can find no problems with it.

Only one of the scripts works - can someone let me know where I am going wrong!!

Thanks,

Eternal Student

Heres the script:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>Untitled Document</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
</head>
<body onload="startscroll();startit()">
<script language="JavaScript1.2">

/*
Pausing updown message scroller-
Dynamic Drive (www.dynamicdrive.com)
For full source code, installation instructions,
Terms Of Use, visit http://www.dynamicdrive.com
*/

//configure the below five variables to change the style of the scroller
var scrollerwidth='200px'
var scrollerheight='110px'
var scrollerbgcolor=''
//set below to '' if you don't wish to use a background image
var scrollerbackground=''

//configure the below variable to change the contents of the scroller
var messages=new Array()
messages[0]="<font face='Arial'><a>Welcome to the ??? Website!</a></font>"
messages[1]="<font face='Arial'><a>We have been keeping an eye on what types of searches you are performing on the site - hence, ........</a></font>"
messages[2]="<font face='Arial'><a>Need a specific link and can't find it? Use the .......</a></font>"
messages[3]="<font face='Arial'><a>Feel free to contact us about anything that you may need.....Just use the E-mail link on the right hand side of the page</a></font>"
messages[4]="<font face='Arial'><a>Thanks for all your support .......</a></font>"

///////Do not edit pass this line///////////////////////

var ie=document.all
var dom=document.getElementById

if (messages.length>2)
i=2
else
i=0

function move1(whichlayer){
tlayer=eval(whichlayer)
if (tlayer.top>0&&tlayer.top<=5){
tlayer.top=0
setTimeout("move1(tlayer)",5500)
setTimeout("move2(document.main.document.second)",5500)
return
}
if (tlayer.top>=tlayer.document.height*-1){
tlayer.top-=5
setTimeout("move1(tlayer)",100)
}
else{
tlayer.top=parseInt(scrollerheight)
tlayer.document.write(messages[i])
tlayer.document.close()
if (i==messages.length-1)
i=0
else
i++
}
}

function move2(whichlayer){
tlayer2=eval(whichlayer)
if (tlayer2.top>0&&tlayer2.top<=5){
tlayer2.top=0
setTimeout("move2(tlayer2)",5500)
setTimeout("move1(document.main.document.first)",5500)
return
}
if (tlayer2.top>=tlayer2.document.height*-1){
tlayer2.top-=5
setTimeout("move2(tlayer2)",100)
}
else{
tlayer2.top=parseInt(scrollerheight)
tlayer2.document.write(messages[i])
tlayer2.document.close()
if (i==messages.length-1)
i=0
else
i++
}
}

function move3(whichdiv){
tdiv=eval(whichdiv)
if (parseInt(tdiv.style.top)>0&&parseInt(tdiv.style.top)<=5){
tdiv.style.top=0+"px"
setTimeout("move3(tdiv)",5500)
setTimeout("move4(second2_obj)",5500)
return
}
if (parseInt(tdiv.style.top)>=tdiv.offsetHeight*-1){
tdiv.style.top=parseInt(tdiv.style.top)-5+"px"
setTimeout("move3(tdiv)",100)
}
else{
tdiv.style.top=parseInt(scrollerheight)
tdiv.innerHTML=messages[i]
if (i==messages.length-1)
i=0
else
i++
}
}

function move4(whichdiv){
tdiv2=eval(whichdiv)
if (parseInt(tdiv2.style.top)>0&&parseInt(tdiv2.style.top)<=5){
tdiv2.style.top=0+"px"
setTimeout("move4(tdiv2)",5500)
setTimeout("move3(first2_obj)",5500)
return
}
if (parseInt(tdiv2.style.top)>=tdiv2.offsetHeight*-1){
tdiv2.style.top=parseInt(tdiv2.style.top)-5+"px"
setTimeout("move4(second2_obj)",100)
}
else{
tdiv2.style.top=parseInt(scrollerheight)
tdiv2.innerHTML=messages[i]
if (i==messages.length-1)
i=0
else
i++
}
}

function startscroll(){
if (ie||dom){
first2_obj=ie? first2 : document.getElementById("first2")
second2_obj=ie? second2 : document.getElementById("second2")
move3(first2_obj)
second2_obj.style.top=scrollerheight
second2_obj.style.visibility='visible'
}
else if (document.layers){
document.main.visibility='show'
move1(document.main.document.first)
document.main.document.second.top=parseInt(scrollerheight)+5
document.main.document.second.visibility='show'
}
}

</script>
<ilayer name="main" id="main" width=&{scrollerwidth}; height=&{scrollerheight}; visibility=hide bgcolor=&{scrollerbgcolor}; background=&{scrollerbackground};>
<layer id="first" left=0 top=1 width=&{scrollerwidth};>
<script language="JavaScript1.2">
if (document.layers)
document.write(messages[0])
</script>
</layer>
<layer id="second" left=0 top=0 width=&{scrollerwidth}; visibility=hide>
<script language="JavaScript1.2">
if (document.layers)
document.write(messages[dyndetermine=(messages.length==1)? 0 : 1])
</script>
</layer>
</ilayer>
<script language="JavaScript1.2">
if (ie||dom){
document.writeln('<div id="main2" style="font-size:12px; position:relative;width:'+scrollerwidth+';height:'+scrollerheight+';overflow:hidden;background-color:'+scrollerbgcolor+' ;background-image:url('+scrollerbackground+')">')
document.writeln('<div style="position:absolute;width:'+scrollerwidth+';height:'+scrollerheight+';clip:rect(0 '+scrollerwidth+' '+scrollerheight+' 0);left:0px;top:0px">')
document.writeln('<div id="first2" style="position:absolute;width:'+scrollerwidth+';left:0px;top:1px;">')
document.write(messages[0])
document.writeln('</div>')
document.writeln('<div id="second2" style="position:absolute;width:'+scrollerwidth+';left:0px;top:0px;visibility:hidden">')
document.write(messages[dyndetermine=(messages.length==1)? 0 : 1])
document.writeln('</div>')
document.writeln('</div>')
document.writeln('</div>')
}
</script>

<script language="JavaScript1.2">

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

var slideshow_width='140px' //SET IMAGE WIDTH
var slideshow_height='225px' //SET IMAGE HEIGHT
var pause=3000 //SET PAUSE BETWEEN SLIDE (3000=3 seconds)

var fadeimages=new Array()
//SET IMAGE PATHS. Extend or contract array as needed
fadeimages[0]="file:///C|/Documents and Settings/Farr/Desktop/The Vet Student Exchange/images/histo1.jpg"
fadeimages[1]="file:///C|/Documents and Settings/Farr/Desktop/The Vet Student Exchange/images/embryo2.jpg"
fadeimages[2]="file:///C|/Documents and Settings/Farr/Desktop/The Vet Student Exchange/images/histo1.jpg"

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

var preloadedimages=new Array()
for (p=0;p<fadeimages.length;p++){
preloadedimages[p]=new Image()
preloadedimages[p].src=fadeimages[p]
}

var ie4=document.all
var dom=document.getElementById

if (ie4||dom)
document.write('<div style="position:relative;width:'+slideshow_width+';height:'+slideshow_height+';overflow:hidden"><div id="canvas0" style="position:absolute;width:'+slideshow_width+';height:'+slideshow_height+';top:0;left:0;filter:alpha(op acity=10);-moz-opacity:10"></div><div id="canvas1" style="position:absolute;width:'+slideshow_width+';height:'+slideshow_height+';top:0;left:0;filter:alpha(op acity=10);-moz-opacity:10"></div></div>')
else
document.write('<img name="defaultslide" src="'+fadeimages[0]+'">')

var curpos=10
var degree=10
var curcanvas="canvas0"
var curimageindex=0
var nextimageindex=1


function fadepic(){
if (curpos<100){
curpos+=10
if (tempobj.filters)
tempobj.filters.alpha.opacity=curpos
else if (tempobj.style.MozOpacity)
tempobj.style.MozOpacity=curpos/100
}
else{
clearInterval(dropslide)
nextcanvas=(curcanvas=="canvas0")? "canvas0" : "canvas1"
tempobj=ie4? eval("document.all."+nextcanvas) : document.getElementById(nextcanvas)
tempobj.innerHTML='<img src="'+fadeimages[nextimageindex]+'">'
nextimageindex=(nextimageindex<fadeimages.length-1)? nextimageindex+1 : 0
setTimeout("rotateimage()",pause)
}
}

function rotateimage(){
if (ie4||dom){
resetit(curcanvas)
var crossobj=tempobj=ie4? eval("document.all."+curcanvas) : document.getElementById(curcanvas)
crossobj.style.zIndex++
var temp='setInterval("fadepic()",50)'
dropslide=eval(temp)
curcanvas=(curcanvas=="canvas0")? "canvas1" : "canvas0"
}
else
document.images.defaultslide.src=fadeimages[curimageindex]
curimageindex=(curimageindex<fadeimages.length-1)? curimageindex+1 : 0
}

function resetit(what){
curpos=10
var crossobj=ie4? eval("document.all."+what) : document.getElementById(what)
if (crossobj.filters)
crossobj.filters.alpha.opacity=curpos
else if (crossobj.style.MozOpacity)
crossobj.style.MozOpacity=curpos/100
}

function startit(){
var crossobj=ie4? eval("document.all."+curcanvas) : document.getElementById(curcanvas)
crossobj.innerHTML='<img src="'+fadeimages[curimageindex]+'">'
rotateimage()
}

if (ie4||dom)



else
setInterval("rotateimage()",pause)

</script>

<p align="center"><font face="Arial" size="-2">Free DHTML scripts provided by<br>
<a href="http://www.dynamicdrive.com">Dynamic Drive</a></font></p>
</body>
</html>

Roy Sinclair
09-25-2003, 09:41 PM
Turn ON the Javascript error messages in your browser.

Then you'd get some indication from the browser when there's an error on your page and that would give you an idea where to look in your code for the problem which would help you quite a lot in solving these problems more quickly.

In this case try looking near the end of your page where you've got a bit of code:


if (ie4||dom)



else
setInterval("rotateimage()",pause)


That code doesn't seem to be complete and it certainly throws a javascript error (which I see because I have the option to show errors turned on).



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