function showDiv(name)
{
var cf=document.getElementById("DivID")
var oImg=document.getElementById(name)
var eT=0,eL=0,p=oImg
var sT=document.body.scrollTop,sL=document.body.scrollLeft
var eH=oImg.height+25,eW=oImg.width
while(p&&p.tagName!="BODY"){eT+=p.offsetTopeL+=p.offsetLeftp=p.offsetParent}
cf.style.top=((document.body.clientHeight-(eT-sT)-eH>=cf.style.posHeight)?eT+eH:eT-cf.style.posHeight)-4
cf.style.left=((document.body.clientWidth-(eL-sL)>=cf.style.posWidth)?eL:eL+eW-cf.style.posWidth)
}
js获取DIV的位置坐标的方法有三种，分别如下：方法一：
?
var odiv=document.getElementByIdx_x('divid')
alert(odiv.getBoundingClientRect().left)
alert(odiv.getBoundingClientRect().top)
方法二：
?
function CPos(x, y)
{
this.x = x
this.y = y
}
function GetObjPos(ATarget)
{
var target = ATarget
var pos = new CPos(target.offsetLeft, target.offsetTop)
var target = target.offsetParent
while (target)
{
pos.x += target.offsetLeft
pos.y += target.offsetTop
target = target.offsetParent
}
return pos
}
var obj = document.getElementByIdx_x('divid')
alert(GetObjPos(obj)['x']) //x坐标
alert(GetObjPos(obj)['y']) //y坐标
方法三：
?
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.getElementByIdx_x(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]
}
}
var xd = getElementPos("divid")
alert(xd.x)
alert(xd.y)
<body><div id="div1" style="width:100px height:100px background:#ccc"></div>
</body>
<script>
var oDiv = document.getElementById('div1')
oDiv.style.position = 'fixed'
oDiv.style.top = '20px'
oDiv.style.left = '20px'
</script>
主要思想就是，在js中修改div的位置。所有的赋值，都可以计算后再传值，这样就不想CSS中只能写一个值了。
