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js获得页面元素位置

2009-06-03 11:34 302 查看
Code
<!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;
parent = 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) { parent = parent.parentNode; }
else { parent = null; } }
return {x:pos[0], y:pos[1]};
}

function showDt(){
var pos=getElementPos("theDt");
// alert(pos.x+','+pos.y);
/*
var re = (function () {
return {a:"不是我不明白，",
b:"是这个世界变化太快"};
}
)();

alert(re.a + re.b); //json 非常good
}
*/
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.returnValue=false;
event.cancelBubble=true; //取消事件冒泡

}

function clickDom(){
//alert('ldkf');
document.getElementById("MydtGenerator").style.display='none';

};
//-->
</script>
</HEAD>

<BODY onclick="clickDom();">
jwoiej;sijdflaksje;fkasd;lkfja;sdkjfaslkdjflaksd
<br>
<br>
<br>
jwoiej;sijdflaksje;fkasd;lkfja;sdkjfaslkdjflaksdjwoiej

<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;">中国人，我爱中国sdjflaiskdjflaksjdflkjs</div>
<br>
;sijdflaksje;fkasd;lkfja;sdkjfaslkdjflaksd
</BODY>
</HTML>
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