SnailWong 发表于 2013-2-7 16:55:50

获取Html元素在页面中的绝对位置及问题

 在Web开发中如果要想随心所欲的自由控制HTML元素,我们很多时候需要获得HTML元素在页面中的绝对位置(就是相对于浏览器的左上角坐标(0,0))。
   这个位置的获取其实并不难,由于每个Html元素提供了一组和位置相关的属性,他们是: offsetLeft、offsetTop和offsetParent,还有两个带offset叫offsetWidth和offsetHeight,不过这俩和我们要说的取Html元素绝对位置没有太大关系。
   属性offsetLeft和offsetTop就是Html元素相对于自己的offsetParent元素的位置,所以我们一般使用如下代码获得指定元素的绝对位置:
<div style="padding-right: 5.4pt; padding-left: 5.4pt; background: #e6e6e6; padding-bottom: 4px; width: 98%; padding-top: 4px;">http://snailwong.iteye.com/Images/OutliningIndicators/None.giffunction GetAbsoluteLocation(element)
http://snailwong.iteye.com/Images/OutliningIndicators/None.gif{
http://snailwong.iteye.com/Images/OutliningIndicators/None.gif    if ( arguments.length != 1 || element == null )
http://snailwong.iteye.com/Images/OutliningIndicators/None.gif    {
http://snailwong.iteye.com/Images/OutliningIndicators/None.gif        return null;
http://snailwong.iteye.com/Images/OutliningIndicators/None.gif    }
http://snailwong.iteye.com/Images/OutliningIndicators/None.gif    var offsetTop = element.offsetTop;
http://snailwong.iteye.com/Images/OutliningIndicators/None.gif    var offsetLeft = element.offsetLeft;
http://snailwong.iteye.com/Images/OutliningIndicators/None.gif    var offsetWidth = element.offsetWidth;
http://snailwong.iteye.com/Images/OutliningIndicators/None.gif    var offsetHeight = element.offsetHeight;
http://snailwong.iteye.com/Images/OutliningIndicators/None.gif    while( element = element.offsetParent )
http://snailwong.iteye.com/Images/OutliningIndicators/None.gif    {
http://snailwong.iteye.com/Images/OutliningIndicators/None.gif        offsetTop += element.offsetTop;
http://snailwong.iteye.com/Images/OutliningIndicators/None.gif        offsetLeft += element.offsetLeft;
http://snailwong.iteye.com/Images/OutliningIndicators/None.gif    }
http://snailwong.iteye.com/Images/OutliningIndicators/None.gif    return { absoluteTop: offsetTop, absoluteLeft: offsetLeft,
http://snailwong.iteye.com/Images/OutliningIndicators/None.gif        offsetWidth: offsetWidth, offsetHeight: offsetHeight };
http://snailwong.iteye.com/Images/OutliningIndicators/None.gif}
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