js实现完美拖拽效果可拖动层与回放拖动规迹并显示拖动距离参数

发布于 2016-12-31 08:28:59 | 176 次阅读 | 评论: 0 | 来源: 网友投递

JavaScript客户端脚本语言

Javascript 是一种由Netscape的LiveScript发展而来的原型化继承的基于对象的动态类型的区分大小写的客户端脚本语言，主要目的是为了解决服务器端语言，比如Perl，遗留的速度问题，为客户提供更流畅的浏览效果。

一个完美的JS拖拽功能，实现层在网页上任意拖动，还可回放拖动规迹，而且在拖动时显示拖动距离参数等相关属性。经本人测试兼容性也是相当不错的代码，学习JavaScript的朋友，可以拿来研究研究，您可不要错过哦

<!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>完美拖拽</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> 
<h2><a href="javascript:;">点击回放拖动轨迹</a></h2> 
<p><strong>Drag:</strong></p> 
<p><strong>offsetTop:</strong></p> 
<p><strong>offsetLeft:</strong></p> 
</div> 
</body> 
</html>

[Ctrl+A 全选注:如需引入外部Js需刷新才能执行]

js实现完美拖拽效果可拖动层与回放拖动规迹并显示拖动距离参数

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