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use onLoad to hide/show images

Posted on 2001-08-06
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Last Modified: 2008-03-04
Hello,

I have an intranet site with GIF images which load slowly and at different rates.  I am looking for someone who can give me usable code which preloads images into cashe (possibly using the onLoad function and looping until every image is loaded and then displaying the images all at once.)  

I use the <DIV> tag to position my images and can set my images to be hidden by default instead of visible.   I am a novice web developer with no javascript experience so please keep everything simple.

Thank you!

0
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Question by:stevenshl
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5 Comments
 
LVL 22

Expert Comment

by:CJ_S
ID: 6356011
Is it an IE only intranet?

If so you can use the following.

Add this to the <head>-section:
<style type='text/css'>
IMG{visibility:hidden;}
</style>

Then load the usual way (no changes needed in your current code). And then add the folowing script (also in the Head-section):
<script>
function document_onload()
{
   for(i=0;i<document.images.length;i++) document.images[i].style.visibility="visible";
}
window.onload=document_onload;
</script>



If you want a different approach, just ask. me or someone else will be able to help you out.

regards,
CJ
0
 
LVL 9

Accepted Solution

by:
nimaig earned 300 total points
ID: 6356187
Try this. Works in both IE and netscape

<html>
<script language="JavaScript">
<!--
     var imgCount = 9;
     var imgLoaded = 0;
     function dispDIV(){
          imgLoaded++;
          if(imgLoaded >= imgCount){
               if(document.all){
                    window.divImg.style.visibility="visible";
               }else if(document.layers){
                    document.divImg.visibility="show";
               }
          }
     }
//-->
</script>
<body>
<form name=myform>
</form>
<DIV name="divImg" id="divImg" style="position:absolute;visibility:hidden">
     <img src="http://otnxchange.experts-exchange.com/images/otn_logo_75x44_xp.gif" onLoad="javascript:dispDIV()">
     <img src="http://www.onjava.com/images/onjava/onjava_logo.jpg" onLoad="javascript:dispDIV()">
     <img src="http://careers.onjava.com/graphics/complogo_thomson.gif" onLoad="javascript:dispDIV()">
     <img src="http://m.doubleclick.net/viewad/567037-468-6to4.gif" onLoad="javascript:dispDIV()">
     <img src="http://m.doubleclick.net/viewad/538206-125-essentialjs2.gif" onLoad="javascript:dispDIV()">
     <img src="http://servedby.advertising.com/mnum=0000018953/logs=0/bins=1/site=0000034004/bnum=34004" onLoad="javascript:dispDIV()">
     <img src="http://otnxchange.experts-exchange.com/images/otn.gif" onLoad="javascript:dispDIV()">
     <img src="http://m.doubleclick.net/viewad/620465-altoweb_120x480_rev2__060501aaaa.gif" onLoad="javascript:dispDIV()">
     <img src="http://ad.doubleclick.net/557907/sgp2q01_336x280_WS_DEV_v_r3_c2.jpg" onLoad="javascript:dispDIV()">
</DIV>

</body>
</html>

0
 

Author Comment

by:stevenshl
ID: 6356646
Our intranet is used by IE and Netscape... we try to keep users current  -  within the last two revisions of both.
0
 
LVL 4

Expert Comment

by:ravi_raj123
ID: 6359165
HI,

<html>
<head>
<script language="JavaScript">
<!--
function MM_preloadImages() { //v3.0
var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}
//-->
</script>
</head>

<body bgcolor="#FFFFFF" text="#000000" background="images/Celebrations.jpg" onLoad="MM_preloadImages('images/pic0.jpg','images/pic1.jpg','images/pic2.jpg','images/pic3.jpg','images/pic4.jpg','images/pic5.jpg')">
</body>
</html>

Hope this is pretty clear to you.
Hope this helps you.
Good Luck...:)
0
 

Author Comment

by:stevenshl
ID: 6361277
Thanks for your help... this code definitely got me going in the right direction.
0

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