js获取DIV的位置坐标的三种方法

js获取DIV的位置坐标的三种方法

2013-11-04 16:12:53 hello刘海 阅读数 1032更多

分类专栏： javascript

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本文链接：https://blog.csdn.net/helloliuhai/article/details/14126593

 方法一：

var odiv=document.getElementByIdx_x_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;  //(1)

     while (target)

     {

         pos.x += target.offsetLeft;

         pos.y += target.offsetTop;     

         target = target.offsetParent  //(2)

     }

     return pos;

 }

      

var obj =  document.getElementByIdx_x_x('divid')  

alert(GetObjPos(obj)['x']) //x坐标

alert(GetObjPos(obj)['y']) //y坐标

 

（1）和（2）这两行代码是什么意思，不是很清楚。。。貌似删除后可以的。

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_x_x_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);

 

注意：方法二和方法三中用到的offsetLeft和offsetTop属性所指定的父元素，将在offsetParent文章中做详细的介绍。