How to fix this JavaScript star rating control? It stops working if the user has to scroll down on the page due to positioning related script.

I am having a problem when trying to use the AJAX Rating Control below.  It works great when the rating controls are located in the first screen of a page where the user does not have to scroll at all.  However, if the page requires the user to scroll the rating controls stop working after the user uses the scroll bar (e.g. the Y position changes).

I wanted to know if anyone could help fix problem this as I am not a JavaScript expert.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>AJAX Star Rating</title>
<style type="text/css">
#star ul.star { LIST-STYLE: none; MARGIN: 0; PADDING: 0; WIDTH: 85px; HEIGHT: 20px; LEFT: 10px; TOP: -5px; POSITION: relative; FLOAT: left; BACKGROUND: url('media/stars.gif') repeat-x; CURSOR: pointer; }
#star li { PADDING: 0; MARGIN: 0; FLOAT: left; DISPLAY: block; WIDTH: 85px; HEIGHT: 20px; TEXT-DECORATION: none; text-indent: -9000px; Z-INDEX: 20; POSITION: absolute; PADDING: 0; }
#star li.curr { BACKGROUND: url('media/stars.gif') left 25px; FONT-SIZE: 1px; }
#star div.user { LEFT: 15px; POSITION: relative; FLOAT: left; FONT-SIZE: 13px; FONT-FAMILY: Arial; COLOR: #888; }
</style>
<script type="text/javascript">
 
/* AJAX Star Rating : v1.0.3 : 2008/05/06 */
/* http://www.nofunc.com/AJAX_Star_Rating/ */
 
function $(v,o) { return((typeof(o)=='object'?o:document).getElementById(v)); }
function $S(o) { return((typeof(o)=='object'?o:$(o)).style); }
function agent(v) { return(Math.max(navigator.userAgent.toLowerCase().indexOf(v),0)); }
function abPos(o) { var o=(typeof(o)=='object'?o:$(o)), z={X:0,Y:0}; while(o!=null) { z.X+=o.offsetLeft; z.Y+=o.offsetTop; o=o.offsetParent; }; return(z); }
function XY(e,v) { var o=agent('msie')?{'X':event.clientX+document.body.scrollLeft,'Y':event.clientY+document.body.scrollTop}:{'X':e.pageX,'Y':e.pageY}; return(v?o[v]:o); }
 
star={};
 
star.mouse=function(e,o) { if(star.stop || isNaN(star.stop)) { star.stop=0;
 
	document.onmousemove=function(e) { var n=star.num;
	
		var p=abPos($('star'+n)), x=XY(e), oX=x.X-p.X, oY=x.Y-p.Y; star.num=o.id.substr(4);
 
		if(oX<1 || oX>84 || oY<0 || oY>19) { star.stop=1; star.revert(); }
		
		else {
 
			$S('starCur'+n).width=oX+'px';
			$S('starUser'+n).color='#111';
			$('starUser'+n).innerHTML=Math.round(oX/84*100)+'%';
		}
	};
} };
 
star.update=function(e,o) { var n=star.num, v=parseInt($('starUser'+n).innerHTML);
 
	n=o.id.substr(4); $('starCur'+n).title=v;
 
	req=new XMLHttpRequest(); req.open('GET','/AJAX_Star_Vote.php?vote='+(v/100),false); req.send(null);    
 
};
 
star.revert=function() { var n=star.num, v=parseInt($('starCur'+n).title);
 
	$S('starCur'+n).width=Math.round(v*84/100)+'px';
	$('starUser'+n).innerHTML=(v>0?Math.round(v)+'%':'');
	$('starUser'+n).style.color='#888';
	
	document.onmousemove='';
 
};
 
star.num=0;
 
</script>
</head>
<body>
<p>Ensure that you have to scroll down using your browser's scroll bar then see if the stars work.</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p>&nbsp; </p>
<div id="star">
 <ul id="star0" class="star" onmousedown="star.update(event,this)" onmousemove="star.mouse(event,this)" title="Rate This!">
  <li id="starCur0" class="curr" title="98" style="width: 82px;"></li>
 </ul>
 <div style="color: rgb(136, 136, 136);" id="starUser0" class="user"></div>
 <br style="clear: both;">
 <ul id="star1" class="star" onmousedown="star.update(event,this)" onmousemove="star.mouse(event,this)" title="Rate This!">
  <li id="starCur1" class="curr" title="50" style="width: 84px;"></li>
 </ul>
 <div style="color: rgb(136, 136, 136);" id="starUser1" class="user"></div>
 <br style="clear: both;">
 <ul id="star2" class="star" onmousedown="star.update(event,this)" onmousemove="star.mouse(event,this)" title="Rate This!">
  <li id="starCur2" class="curr" title="99" style="width: 83px;"></li>
 </ul>
 <div style="color: rgb(136, 136, 136);" id="starUser2" class="user"></div>
 <br style="clear: both;">
 <ul id="star3" class="star" onmousedown="star.update(event,this)" onmousemove="star.mouse(event,this)" title="Rate This!">
  <li id="starCur3" class="curr" title="70" style="width: 59px;"></li>
 </ul>
 <div style="color: rgb(136, 136, 136);" id="starUser3" class="user"></div>
 <br style="clear: both;">
 <ul id="star4" class="star" onmousedown="star.update(event,this)" onmousemove="star.mouse(event,this)" title="Rate This!">
  <li id="starCur4" class="curr" title="30" style="width: 25px;"></li>
 </ul>
 <div style="color: rgb(136, 136, 136);" id="starUser4" class="user"></div>
 
  <br style="clear: both;">
 <ul id="star5" class="star" onmousedown="star.update(event,this)" onmousemove="star.mouse(event,this)" title="Rate This!">
  <li id="starCur5" class="curr" title="30" style="width: 25px;"></li>
 </ul>
 <div style="color: rgb(136, 136, 136);" id="starUser5" class="user"></div>
</div>
 
</body>
</html>

Open in new window

endrecAsked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

x
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

SRigneyCommented:
Is this a control you wrote yourself?  

Why are you using so much xy positioning code.  Even in your mouse over, you know which object it is, you are passing this in the parameter list.  Why don't you just use the object rather than the xy coordinates code to get what you need?
0
endrecAuthor Commented:
I saw the the create of the JavaScript found this problem as well and has corrected it on their site.  

http://www.nofunc.com/AJAX_Star_Rating/

This line was incorrect:

function XY(e,v) { var o=agent('msie')?{'X':event.clientX+document.body.scrollLeft,'Y':event.clientY+document.body.scrollTop}:{'X':e.pageX,'Y':e.pageY}; return(v?o[v]:o); }
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
JavaScript

From novice to tech pro — start learning today.