JavaScript :获取元素的坐标的三种方法
这是从别人那里看到的方法,具体出处不记得了,做下记录。
//获取div的坐标
//方法一
function check() {
var obj = document.getElementById('deleteDiv')
//方法一
var x = obj.getBoundingClientRect().left;
var y = obj.getBoundingClientRect().top;
alert("方法一:" + x + "," + y);
//方法二
alert("方法二:" + GetObjPos(obj)['x'] + "," + GetObjPos(obj)['y']); //x坐标
var xd = getElementPos("deleteDiv");
alert("方法三:" + xd.x+"," + xd.y);
}
//方法二
function CPos(x, y) {
this.x = x;
this.y = y;
}
/**
* 得到对象的相对浏览器的坐标
*/
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;
}
//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.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]
};
}
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