js div浮动层拖拽效果代码

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以下是 js div浮动层拖拽效果代码的示例演示效果:
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部分效果截图2:
HTML代码(index.html):
<!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 div浮动层拖拽效果代码</title>
<style type="text/css">
div,h2,p{margin:0;padding:0;}
body{font:14px/1.5 arial;}
#box{width:100px;height:100px;background:#fef4eb;padding:5px;margin:50px;border:1px solid #f60;}
#box .title{height:25px;background:#f60;}
#tool{margin-bottom:10px;}
</style>
<script type="text/javascript">
function Drag()
{
	//初始化
	this.initialize.apply(this, arguments)
}
Drag.prototype = {
	//初始化
	initialize : function (drag, options)
	{
		this.drag = this.$(drag);
		this._x = this._y = 0;
		this._moveDrag = this.bind(this, this.moveDrag);
		this._stopDrag = this.bind(this, this.stopDrag);
		
		this.setOptions(options);
		
		this.handle = this.$(this.options.handle);
		this.maxContainer = this.$(this.options.maxContainer);
		
		this.maxTop = Math.max(this.maxContainer.clientHeight, this.maxContainer.scrollHeight) - this.drag.offsetHeight;
		this.maxLeft = Math.max(this.maxContainer.clientWidth, this.maxContainer.scrollWidth) - this.drag.offsetWidth;
		
		this.limit = this.options.limit;
		this.lockX = this.options.lockX;
		this.lockY = this.options.lockY;
		this.lock = this.options.lock;
		
		this.onStart = this.options.onStart;
		this.onMove = this.options.onMove;
		this.onStop = this.options.onStop;
		
		this.handle.style.cursor = "move";
		
		this.changeLayout();
		
		this.addHandler(this.handle, "mousedown", this.bind(this, this.startDrag))
	},
	changeLayout : function ()
	{
		this.drag.style.top = this.drag.offsetTop + "px";
		this.drag.style.left = this.drag.offsetLeft + "px";
		this.drag.style.position = "absolute";
		this.drag.style.margin = "0"
	},
	startDrag : function (event)
	{		
		var event = event || window.event;
		
		this._x = event.clientX - this.drag.offsetLeft;
		this._y = event.clientY - this.drag.offsetTop;
		
		this.addHandler(document, "mousemove", this._moveDrag);
		this.addHandler(document, "mouseup", this._stopDrag);
		
		event.preventDefault && event.preventDefault();
		this.handle.setCapture && this.handle.setCapture();
		
		this.onStart()
	},
	moveDrag : function (event)
	{
		var event = event || window.event;
		
		var iTop = event.clientY - this._y;
		var iLeft = event.clientX - this._x;
		
		if (this.lock) return;
		
		this.limit && (iTop < 0 && (iTop = 0), iLeft < 0 && (iLeft = 0), iTop > this.maxTop && (iTop = this.maxTop), iLeft > this.maxLeft && (iLeft = this.maxLeft));
		
		this.lockY || (this.drag.style.top = iTop + "px");
		this.lockX || (this.drag.style.left = iLeft + "px");
		
		event.preventDefault && event.preventDefault();
		
		this.onMove()
	},
	stopDrag : function ()
	{
		this.removeHandler(document, "mousemove", this._moveDrag);
		this.removeHandler(document, "mouseup", this._stopDrag);
		
		this.handle.releaseCapture && this.handle.releaseCapture();
		
		this.onStop()
	},
	//参数设置
	setOptions : function (options)
	{
		this.options =
		{
			handle:			this.drag, //事件对象
			limit:			true, //锁定范围
			lock:			false, //锁定位置
			lockX:			false, //锁定水平位置
			lockY:			false, //锁定垂直位置
			maxContainer:	document.documentElement || document.body, //指定限制容器
			onStart:		function () {}, //开始时回调函数
			onMove:			function () {}, //拖拽时回调函数
			onStop:			function () {}  //停止时回调函数
		};
		for (var p in options) this.options[p] = options[p]
	},
	//获取id
	$ : function (id)
	{
		return typeof id === "string" ? document.getElementById(id) : id
	},
	//添加绑定事件
	addHandler : function (oElement, sEventType, fnHandler)
	{
		return oElement.addEventListener ? oElement.addEventListener(sEventType, fnHandler, false) : oElement.attachEvent("on" + sEventType, fnHandler)
	},
	//删除绑定事件
	removeHandler : function (oElement, sEventType, fnHandler)
	{
		return oElement.removeEventListener ? oElement.removeEventListener(sEventType, fnHandler, false) : oElement.detachEvent("on" + sEventType, fnHandler)
	},
	//绑定事件到对象
	bind : function (object, fnHandler)
	{
		return function ()
		{
			return fnHandler.apply(object, arguments)	
		}
	}
};





//应用
window.onload = function ()
{
	var oBox = document.getElementById("box");	
	var oTitle = oBox.getElementsByTagName("h2")[0];
	var oSpan = document.getElementsByTagName("span")[0];
	var oDrag = new Drag(oBox, {handle:oTitle, limit:false});
	
	var aInput = document.getElementsByTagName("input");
	
	//锁定范围接口
	aInput[0].onclick = function ()
	{
		oDrag.limit = !oDrag.limit;
		this.value = oDrag.limit ? "取消锁定范围" : "锁定范围"
	};
	
	//水平锁定接口
	aInput[1].onclick = function ()
	{
		oDrag.lockX = !oDrag.lockX;
		this.value = oDrag.lockX ? "取消水平锁定" : "水平锁定"
	};
	
	//垂直锁定接口
	aInput[2].onclick = function ()
	{
		oDrag.lockY = !oDrag.lockY;
		this.value = oDrag.lockY ? "取消垂直锁定" : "垂直锁定"
	};
	
	//锁定位置接口
	aInput[3].onclick = function ()
	{
		oDrag.lock = !oDrag.lock;
		this.value = oDrag.lock ? "取消锁定位置" : "锁定位置"
	};
	
	//开始拖拽时方法
	oDrag.onStart = function ()
	{
		oSpan.innerHTML = "开始拖拽"	
	};
	
	//开始拖拽时方法
	oDrag.onMove = function ()
	{
		oSpan.innerHTML = "left:" + this.drag.offsetLeft + ", top:" + this.drag.offsetTop	
	};
	
	//开始拖拽时方法
	oDrag.onStop = function ()
	{
		oSpan.innerHTML = "结束拖拽"	
	};
};
</script>
</head>
<body>
<div id="tool">
	<input type="button" value="锁定范围" />
    <input type="button" value="水平锁定" />
    <input type="button" value="垂直锁定" />
    <input type="button" value="锁定位置" />
</div>
<p>拖放状态：<span>未开始</span></p>
<div id="box">
	<h2 class="title"></h2>
</div>
</body>
</html>
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