<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>获取页面元素的位置</title>
<style>
div{padding:20px;}
</style>
</head>
<body>
<script>
//页面的实际尺寸
function getPagearea(){
if(document.compatMode == 'Backcompat'){
return {
width : Math.max(document.body.clientWidth,document.body.scrollWidth),
height : Math.max(document.body.clientHeight,document.body.scrollHeight)
}
}else{
return {
width : Math.max(document.documentElement.clientWidth,document.documentElement.scrollWidth),
height : Math.max(document.documentElement.clientHeight,document.documentElement.scrollHeight)
}
}
}
//获取元素在页面里的绝对位置
function getElementLeft(element){
var actualLeft = element.offsetLeft;
var current = element.offsetParent;
while (current !== null){
actualLeft += current.offsetLeft;
current = current.offsetParent;
}
return actualLeft;
}
function getElementTop(element){
var actualTop = element.offsetTop;
var current = element.offsetParent;
while (current !== null){
actualTop += current.offsetTop;
current = current.offsetParent;
}
return actualTop;
}
// 由于在表格和iframe中，offsetParent对象未必等于父容器，所以上面的函数对于表格和iframe中的元素不适用
//获取元素在页面里的相对位置
function getElementViewLeft(){
var actualLeft = element.offsetLeft;
var current = element.offsetParent;
while (current !== null){
actualLeft += current.offsetLeft;
current = current.offsetParent;
}
if(document.compatMode == 'Backcompat'){
var elementScrollLeft = document.documentElement.scrollLeft;
}else{
var elementScrollLeft = document.body.scrollLeft;
}
return actualLeft - elementScrollLeft;
}
</script>
</body>
</html>
