JS实现网页中可以任意拖动的DIV层,并可以自动回放轨迹

ggp 技术 2013-01-06 533 次浏览

这个代码比较简单也可以实现这个功能,但是多了一个在拖动完后,点击回放,会沿着拖动的轨迹回放到最初的位置。

[code]<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>JS完美实现网页任意拖动DIV 可以回放轨迹</title>
<style type="text/css">
html,body{overflow:hidden;}
body,div,h2,p{margin:0;padding:0;}
body{color:#fff;background:#000;font:12px/2 Arial;}
p{padding:0 10px;margin-top:10px;}
span{color:#ff0;padding-left:5px;}
#box{position:absolute;width:300px;height:150px;background:#333;border:2px solid #ccc;top:50%;left:50%;margin:-75px 0 0 -150px;}
#box h2{height:25px;cursor:move;background:#222;border-bottom:2px solid #ccc;text-align:right;padding:0 10px;}
#box h2 a{color:#fff;font:12px/25px Arial;text-decoration:none;outline:none;}
</style>
<script type="text/javascript">
window.onload=function ()
{
var oBox=document.getElementById("box");
var oH2 = oBox.getElementsByTagName("h2")[0];
var oA = oBox.getElementsByTagName("a")[0];
var aSpan = oBox.getElementsByTagName("span");
var disX = disY = 0;
var bDrag = false;
var aPos = [{x:oBox.offsetLeft, y:oBox.offsetTop}]
//鼠标按下, 激活拖拽
oH2.onmousedown = function (event)
{
var event = event || window.event;
bDrag = true;
disX = event.clientX – oBox.offsetLeft;
disY = event.clientY – oBox.offsetTop;
aPos.push({x:oBox.offsetLeft, y:oBox.offsetTop})
this.setCapture && this.setCapture();
return false
};
//拖拽开始
document.onmousemove = function (event)
{
if (!bDrag) return;
var event = event || window.event;
var iL = event.clientX – disX;
var iT = event.clientY – disY;
var maxL = document.documentElement.clientWidth – oBox.offsetWidth;
var maxT = document.documentElement.clientHeight – oBox.offsetHeight;
iL = iL < 0 ? 0 : iL;
iL = iL > maxL ? maxL : iL;
iT = iT < 0 ? 0 : iT;
iT = iT > maxT ? maxT : iT;
oBox.style.marginTop = oBox.style.marginLeft = 0;
oBox.style.left = iL + "px";
oBox.style.top = iT + "px";
aPos.push({x:iL, y:iT})
status();
return false
};
//鼠标释放, 结束拖拽
document.onmouseup = window.onblur = oH2.onlosecapture = function ()
{
bDrag = false;
oH2.releaseCapture && oH2.releaseCapture();
status()
};
//回放拖动轨迹
oA.onclick = function ()
{
if (aPos.length == 1) return;
var timer = setInterval(function ()
{
var oPos = aPos.pop();
oPos ? (oBox.style.left = oPos.x + "px", oBox.style.top = oPos.y + "px", status()) : clearInterval(timer)
}, 30);
this.focus = false;//去除链接虚线
return false
};
//阻止冒泡
oA.onmousedown = function (event)
{
(event || window.event).cancelBubble = true
};
//监听状态函数
function status ()
{
aSpan[0].innerHTML = bDrag;
aSpan[1].innerHTML = oBox.offsetTop;
aSpan[2].innerHTML = oBox.offsetLeft
}
//初始调用
status()
};
</script>
</head>
<body>
<div id="box">
<h2><a href="javascript:;">点击回放拖动轨迹</a></h2>
<p><strong>Drag:</strong><span></span></p>
<p><strong>offsetTop:</strong><span></span></p>
<p><strong>站长学院 www.pigzz.com</strong><span></span></p>
</div>
</body>
</html>[/code]

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