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获取网页中元素位置

2010-06-30 00:19 246 查看 
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
<script language="JavaScript" type="text/javascript">
<!--  // 说明：用 Javascript 获取指定页面元素的位置    来自internet

function getElementPos(elementId)
{      var ua = navigator.userAgent.toLowerCase();
var isOpera = (ua.indexOf('opera') != -1);
var isIE = (ua.indexOf('msie') != -1 && !isOpera);
// not opera spoof
var el = document.getElementById(elementId);
if(el.parentNode === null || el.style.display == 'none')
{         return false;     }
var parent = null;
var pos = [];
var box;
if(el.getBoundingClientRect)    //IE
{
box = el.getBoundingClientRect();
var scrollTop = Math.max(document.documentElement.scrollTop, document.body.scrollTop);
var scrollLeft = Math.max(document.documentElement.scrollLeft, document.body.scrollLeft);
return {x:box.left + scrollLeft, y:box.top + scrollTop};     }
else if(document.getBoxObjectFor)
// gecko
{         box = document.getBoxObjectFor(el);
var borderLeft = (el.style.borderLeftWidth)?parseInt(el.style.borderLeftWidth):0;
var borderTop = (el.style.borderTopWidth)?parseInt(el.style.borderTopWidth):0;
pos = [box.x - borderLeft, box.y - borderTop];     }
else    // safari & opera
{
pos = [el.offsetLeft, el.offsetTop];
parent = el.offsetParent;
if (parent != el) {
while (parent) {
pos[0] += parent.offsetLeft;
pos[1] += parent.offsetTop;
parentparent = parent.offsetParent;             }         }
if (ua.indexOf('opera') != -1              || ( ua.indexOf('safari') != -1 && el.style.position == 'absolute' ))
{
pos[0] -= document.body.offsetLeft;
pos[1] -= document.body.offsetTop;         }      }
if (el.parentNode) { parent = el.parentNode; }     else { parent = null; }
while (parent && parent.tagName != 'BODY' && parent.tagName != 'HTML')
{ // account for any scrolled ancestors
pos[0] -= parent.scrollLeft;         pos[1] -= parent.scrollTop;
if (parent.parentNode) { parentparent = parent.parentNode; }
else { parent = null; }     }
return {x:pos[0], y:pos[1]};
}
function showDt(){
var pos=getElementPos("theDt");
var obj=document.getElementById("MydtGenerator");

var h=parseInt(document.getElementById("theDt").style.height);
obj.style.left=pos.x;
obj.style.top=pos.y+h;
obj.style.display='';
event.cancelBubble=true;

}

//-->
</script>
</HEAD>

<BODY>

<INPUT TYPE="text" style="height:25px;" NAME="theDt" id="theDt" onclick="showDt();">

<div id='MydtGenerator' style="width:100;height:200px;border:solid 1px red; position:absolute;left:0;top:10; z-index:999; display:none;" onclick="javascript:event.cancelBubble=true;">test</div>

</BODY>
</HTML>
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