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'(object reference)' is null or not an object

 
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All Forums >> Web Development >> Microsoft FrontPage Help >> '(object reference)' is null or not an object
Page: [1]
 
M.J

 

Posts: 2
Joined: 5/18/2005
Status: offline

 
'(object reference)' is null or not an object - 5/18/2005 10:54:21   
hi

i am using a code to view some pictures .. and it work fine with me ..

but..

when i use the same code to view an other set of pictures this error appears
:

'(tdiv.style.left)' is null or not an object

how can i prevent that error ..

i want to use that code more than once in my page

can u help me plz ?

************************************

i took my code from this link:

http://www.dynamicdrive.com/dynamicindex14/leftrightslide2.htm

************************************



code:



<script language="JavaScript1.2">

/*
Left-Right image slideshow Script-
By Dynamic Drive (www.dynamicdrive.com)
For full source code, terms of use, and 100's more scripts, visit http://dynamicdrive.com
*/

///////configure the below four variables to change the style of the slider///////
//set the scrollerwidth and scrollerheight to the width/height of the LARGEST image in your slideshow!
var scrollerwidth='100px'
var scrollerheight='106px'
var scrollerbgcolor='white'
//3000 miliseconds=3 seconds
var pausebetweenimages=3000


//configure the below variable to change the images used in the slideshow. If you wish the images to be clickable, simply wrap the images with the appropriate <a> tag
var slideimages=new Array()
slideimages[0]='<a href="http://www.cnn.com"><img src="PE01805A.gif" border=0"></a>'
slideimages[1]='<img src="PE01803A.gif">'
slideimages[2]='<img src="TN00411A.gif">'
slideimages[3]='<img src="PE02054A.gif">'
slideimages[4]='<img src="cake.gif">'
//extend this list

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

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

if (slideimages.length>1)
i=2
else
i=0

function move1(whichlayer){
tlayer=eval(whichlayer)
if (tlayer.left>0&&tlayer.left<=5){
tlayer.left=0
setTimeout("move1(tlayer)",pausebetweenimages)
setTimeout("move2(document.main.document.second)",pausebetweenimages)
return
}
if (tlayer.left>=tlayer.document.width*-1){
tlayer.left-=5
setTimeout("move1(tlayer)",50)
}
else{
tlayer.left=parseInt(scrollerwidth)+5
tlayer.document.write(slideimages)
tlayer.document.close()
if (i==slideimages.length-1)
i=0
else
i++
}
}

function move2(whichlayer){
tlayer2=eval(whichlayer)
if (tlayer2.left>0&&tlayer2.left<=5){
tlayer2.left=0
setTimeout("move2(tlayer2)",pausebetweenimages)
setTimeout("move1(document.main.document.first)",pausebetweenimages)
return
}
if (tlayer2.left>=tlayer2.document.width*-1){
tlayer2.left-=5
setTimeout("move2(tlayer2)",50)
}
else{
tlayer2.left=parseInt(scrollerwidth)+5
tlayer2.document.write(slideimages)
tlayer2.document.close()
if (i==slideimages.length-1)
i=0
else
i++
}
}

function move3(whichdiv){
tdiv=eval(whichdiv)
if (parseInt(tdiv.style.left)>0&&parseInt(tdiv.style.left)<=5){
tdiv.style.left=0+"px"
setTimeout("move3(tdiv)",pausebetweenimages)
setTimeout("move4(scrollerdiv2)",pausebetweenimages)
return
}
if (parseInt(tdiv.style.left)>=tdiv.offsetWidth*-1){
tdiv.style.left=parseInt(tdiv.style.left)-5+"px"
setTimeout("move3(tdiv)",50)
}
else{
tdiv.style.left=scrollerwidth
tdiv.innerHTML=slideimages
if (i==slideimages.length-1)
i=0
else
i++
}
}

function move4(whichdiv){
tdiv2=eval(whichdiv)
if (parseInt(tdiv2.style.left)>0&&parseInt(tdiv2.style.left)<=5){
tdiv2.style.left=0+"px"
setTimeout("move4(tdiv2)",pausebetweenimages)
setTimeout("move3(scrollerdiv1)",pausebetweenimages)
return
}
if (parseInt(tdiv2.style.left)>=tdiv2.offsetWidth*-1){
tdiv2.style.left=parseInt(tdiv2.style.left)-5+"px"
setTimeout("move4(scrollerdiv2)",50)
}
else{
tdiv2.style.left=scrollerwidth
tdiv2.innerHTML=slideimages
if (i==slideimages.length-1)
i=0
else
i++
}
}

function startscroll(){
if (ie||dom){
scrollerdiv1=ie? first2 : document.getElementById("first2")
scrollerdiv2=ie? second2 : document.getElementById("second2")
move3(scrollerdiv1)
scrollerdiv2.style.left=scrollerwidth
}
else if (document.layers){
document.main.visibility='show'
move1(document.main.document.first)
document.main.document.second.left=parseInt(scrollerwidth)+5
document.main.document.second.visibility='show'
}
}

window.onload=startscroll

</script>




<ilayer id="main" width=&{scrollerwidth}; height=&{scrollerheight}; bgColor=&{scrollerbgcolor}; visibility=hide>
<layer id="first" left=1 top=0 width=&{scrollerwidth}; >
<script language="JavaScript1.2">
if (document.layers)
document.write(slideimages[0])
</script>
</layer>
<layer id="second" left=0 top=0 width=&{scrollerwidth}; visibility=hide>
<script language="JavaScript1.2">
if (document.layers)
document.write(slideimages[1])
</script>
</layer>
</ilayer>

<script language="JavaScript1.2">
if (ie||dom){
document.writeln('<div id="main2" style="position:relative;width:'+scrollerwidth+';height:'+scrollerheight+';overflow:hidden;background-color:'+scrollerbgcolor+'">')
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:1px;top:0px;">')
document.write(slideimages[0])
document.writeln('</div>')
document.writeln('<div id="second2" style="position:absolute;width:'+scrollerwidth+';left:0px;top:0px">')
document.write(slideimages[1])
document.writeln('</div>')
document.writeln('</div>')
document.writeln('</div>')
}
</script>

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




kevin3442

 

Posts: 197
Joined: 1/25/2005
From: Nebraska, USA (home of the once-mighty Huskers)
Status: offline

 
RE: '(object reference)' is null or not an object - 5/18/2005 12:25:16   
Just looking at the js code won't necessarily help us tell you why it works in one place but not another.  Offhand, I'd say that it might be because the page where it doesn't work doesn't have a div named "tdiv".  But that's just a guess.  It'll be easier to diagnose the problem if we can see it in action.  Can you please post a url to your site, or a page where this is happening?

Kevin

(in reply to M.J)
M.J

 

Posts: 2
Joined: 5/18/2005
Status: offline

 
RE: '(object reference)' is null or not an object - 5/19/2005 5:42:13   
i hope that u can download these 2 file

page.zip (the code working fine)

error.zip (after dupilcating the code i got the error)

(in reply to kevin3442)
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