JavaScript auto scroll RSS feed loop gets slower after running certain time

**orangeadnan** · 02-15-2013 10:36 AM

Hi,
I have a JavaScript auto scroll RSS feed page, that runs fine but it gets/responds very slow after running 24+ hours. Not sure what is the best way to create this kind of page that could run at least few months without any issue?

Example: RSS feed auto scroll loop

Detail info if that helps:
I'm using a CNN RSS feed and using rssdog.com to parse data. I have a decent shared web hosting. I'm using Firefox on a windows 7 PC with 2GB of RAM. This PC is going to run 24/7 only for a feed for 3 months.

Please let me know if there is any better way to handle this? Thanks so much (in advance)!

Code:
<!DOCTYPE html>
<HTML>
<HEAD>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=UTF-8">
<META HTTP-EQUIV="REFRESH" CONTENT="900">
<TITLE>RSS feed autoscroll loop</TITLE>
<META NAME="description" CONTENT="">
<meta name="robots" content="index,nofollow" />
<meta http-equiv="Cache-Control" content="no-cache, no-store, must-revalidate" />
<meta http-equiv="Pragma" content="no-cache" />
<meta http-equiv="Expires" content="0" />

<STYLE TYPE="text/css">
body,html {
min-height:100%; /*Firefox scrollbar fix*/
}
a, a:visited, a:hover, a:active {
color:#333;
text-decoration: none;
display: block;
padding-bottom: 12px;
margin-top: 10px;;
}
#top-stories {
font-family: 'Helvetica', Verdana, sans-serif;
font-size: 1.5em;
font-weight: bolder;
text-align: left;
line-height: 1.2em;
margin: 0px 15px 0px 15px;
}
</STYLE>
</HEAD>

<BODY>
<script language="JavaScript1.2">

/*
Top-Down scrolling window Script- © Dynamic Drive (www.dynamicdrive.com)
For full source code, visit http://www.dynamicdrive.com
This notice MUST stay intact for use
*/

//change 1 to another integer to alter the scroll speed. Greater is faster
var speed=1
var currentpos=0,alt=1,curpos1=0,curpos2=-1
function initialize(){
startit()
}

function iecompattest(){
return (document.compatMode!="BackCompat")? document.documentElement : document.body
}

function scrollwindow(){
if (document.all)
temp=iecompattest().scrollTop
else
temp=window.pageYOffset
if (alt==0)
alt=1
else
alt=0
if (alt==0)
curpos1=temp
else
curpos2=temp
if (curpos1!=curpos2){
if (document.all)
currentpos=iecompattest().scrollTop+speed
else
currentpos=window.pageYOffset+speed
window.scroll(0,currentpos)
}
else{
currentpos=0
window.scroll(0,currentpos)
}
}
function startit(){
setInterval("scrollwindow()",50)
}
window.onload=initialize
</script>

<div id="top-stories">
<script type="text/javascript" language="javascript" src="http://www.rssdog.com/index.htm?url=http%3A%2F%2Frss.cnn.com%2Frss%2Fedition.rss&mode=javascript&showonly=&max items=500&showdescs=1&desctrim=0&descmax=0&tabwidth=100%25&excltitle=1&linkt arget=_blank&bordercol=%23d4d0c8&headbgcol=%23999999&headtxtcol=%23ffffff&titlebgcol =%23f1eded&titletxtcol=%23000000&itembgcol=%23ffffff&itemtxtcol=%23000000&ctl=0">
</script>
</div>

</BODY>
</HTML>

**Logic Ali** · 02-16-2013 07:58 PM

Perhaps content is expiring and being reloaded, causing multiple onload events. Try modifying the initialize function as follows:

Code:

function initialize()
{
  window.onload = null;
  startit();
}

**orangeadnan** · 02-18-2013 09:54 AM

Thanks so much Logic Ali. I updated the function and running another test for next 24 hours. Let's see how it works. Thanks again!

**orangeadnan** · 02-19-2013 09:32 AM

Logic Ali,
This time it worked well without any problem. Thanks so much.

One more question: Do you think this script might cause Firefox throwing script error/warning message (e.g. a script on this page may be busy...) if I keep running this for few months non-stop? If yes, then what are the other options to parse and display RSS feeds?

Thread: JavaScript auto scroll RSS feed loop gets slower after running certain time

Thread Tools

Display

JavaScript auto scroll RSS feed loop gets slower after running certain time

Thread Information

Users Browsing this Thread

Bookmarks

Bookmarks

Posting Permissions