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Streaming text, with focus always on bottom

steve_howell
steve_howell asked
on
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Last Modified: 2013-12-25
I found out a way in Netscape to stream text to the browser without any buffering.  In other words, as my CGI programs gets the data (trace data from another program), it sends it to the browser and the browser keeps streaming the data.  Only nice feature missing would be for browser to show the text at the bottom and scroll, instead of keeping focus on top.  I suspect JavaScript might help here, but I know very little about it.  Java's not a realistic option.  
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The solution is not so complicated: At the top of your file, you have to send the following code:
<script language="JavaScript1.1">
<!-- hide code
function scrollIt() {
  window.scroll(0,100000); //scroll to bottom
  scr_id=setTimeout("scrollIt()",1000);
}
scrollIt();
// end of hiding -->
</script>

This will scroll the window to the bottom once per second (every 1000 milliseconds) (the function calls itself).
Then, when your file is complete, the last lines to send are:
<script language="JavaScript1.1">
clearTimeout(scr_id);
</script>

this stops the scrolling.
If you want to see this code "in action", you can go to netchat.city.de - this is a very nice real-time chat that uses the same technique: it keeps sending lines as people "speak" and displays them right away.

P.S.: This will only work in Netscape 3+, because IE does not support a scroll-function. IE 4 might support it and it would then probably be the same one.

Good luck ;-)

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Commented:
Great answer.  This should solve my problem perfectly.  
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