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  • Status: Solved
  • Priority: Medium
  • Security: Public
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Refresh automatically?

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
nyt
Asked:
nyt
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1 Solution
 
Michel PlungjanIT ExpertCommented:
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
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Michel PlungjanIT ExpertCommented:
If you want just one new image each time the page is loaded you need to use cookies.

Michel
0
 
nytAuthor Commented:
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?
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nytAuthor Commented:
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
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Michel PlungjanIT ExpertCommented:
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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