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Reload Webcam Images by Port Number

Posted on 2008-06-23
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282 Views
Last Modified: 2010-04-21
Hi everyone, first time-long time, so be gentle. :)

When users log into our warehouse website, they can view specific webcams as designated by their account permissions. Each webcam FTPs one image every second to a predetermined image directory and has a different image name based on its port (ex. "80021.jpg", "80022.jpg", etc.)

Using a PHP recordset, I'm loading one camera image at a time, based on permissions, and that's working great. But using Javascript I want to refresh the images every 2 seconds without refreshing the page.

My problem is I need to tell the Javascript newImage function (see below) what the image is called (ex. "80021.jpg", "80022.jpg", etc.) based on the PHP recordset.

(Javascript to reload the image:)
<script type="text/javascript">
function newImage(){
      if(document.images){
            document.images['camImage'].src =**CAMERA-SPECIFIC IMAGE NAME HERE??** +  '.jpg?' + Date.parse(new Date().toString());
      }
      setTimeout(newImage,5000);
}
</script>

(Image call in the html body:)
<img name="camImage" src="<? echo $aCams[$iCount]['iPortNumber']?>.jpg" />

Admittedly this kinda thing is new to me, so if I need to bark up another tree, let me know.
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Question by:IgniteWeb
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3 Comments
 
LVL 75

Accepted Solution

by:
Michel Plungjan earned 500 total points
ID: 21854542
<script type="text/javascript">
function newImage(){
  if (!document.images) return; // no need to stay
  var src = document.images['camImage'].src;
  document.images['camImage'].src = src.substring(0,src.lastIndexOf('.jpg'))+ '.jpg?' + new Date().getTime();
  setTimeout('newImage()',5000);
}
</script>
0
 
LVL 75

Expert Comment

by:Michel Plungjan
ID: 21854557
or better
<script type="text/javascript">
function newImage(){
  var src = document.images['camImage'].src;
  document.images['camImage'].src = src.substring(0,src.lastIndexOf('.jpg'))+ '.jpg?' + new Date().getTime();
}
window.onload=function() {
  if (document.images) setInterval('newImage()',5000);
}
</script>

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Author Closing Comment

by:IgniteWeb
ID: 31469872
Thanks for your expertise. much appreciated!
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