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Refresh automatically?

Posted on 2000-05-09
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Last Modified: 2010-04-09
Hi,
I saw some homepages(forgot the URLs already) which contain some images which can refresh themselves automatically.  The most special is that only the images are changed(random image), but the whole page hadn't got reloaded.  Therefore, the visitor will not be disturbed by the refresh action of the images.

How can I achieve this?  Will "layer" help?
Thanks in advance.
PS.  Please don't suggest me to use frames.
0
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Question by:nyt
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5 Comments
 
LVL 75

Accepted Solution

by:
Michel Plungjan earned 50 total points
ID: 2791806
They use javascript:

<html>
<head>
<script>
myImageNames = new Array('image0','image1','image2','image3')
myImages = new Array();

/* preload */

if (document.images) {
   for (i=0;i<myImages.length;i++) {
      myImages[i] = new Image();
      myImages[i].src = myImageNames[i] +'.jpg';
   }
}

count = 0
function swap() {
   if (!document.images) return;
   count++;
   if (count > myImages.length) count = 0;
   document.images['banner'].src = myImages[count].src;
   setTimeout('swap()',5000);
}
</script>
</head>
<body onLoad="swap()">
<img src=image0.jpg name=banner>

Michel
0
 
LVL 75

Expert Comment

by:Michel Plungjan
ID: 2791811
If you want just one new image each time the page is loaded you need to use cookies.

Michel
0
 

Author Comment

by:nyt
ID: 2791864
I use Netscape.
The code seems not working under Netscape.  Netscape gave me this error message:
"Line 21: myImages[count] has no properties."

How can I correct this so that the code can work under both Netscape and IE?
0
 

Author Comment

by:nyt
ID: 2791887
Moreover,
I prefer not using "Preload"...since the image files are actually changing with time.  That is something like a counter, the code loads the image file in regular intervals, so that the counter image can give the most updated info.

Of course, I am not do this for a counter.  Counter is used to explain what I want.

Thanks
0
 
LVL 75

Expert Comment

by:Michel Plungjan
ID: 2791906
Bug. I just whipped it up from the top of my head...

change

if (count > myImages.length) count = 0;

to

if (count >= myImages.length) count = 0;


To not preload use this:

<html>
<head>
<script>
myImages = new Array('image0.jpg','image1.jpg','image2.jpg','image3.jpg')
count = 0
function swap() {
   if (!document.images) return;
   count++;
   if (count >= myImages.length) count = 0;
   document.images['banner'].src = myImages[count];
   setTimeout('swap()',5000);
}
</script>
</head>
<body onLoad="swap()">
<img src=image0.jpg name=banner>

Michel
0

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