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js完美的div拖拽程序代码

发布时间：2023-12-19 编辑：jiaochengji.com

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文章实现的div拖拽程序可以根据按钮来控制是要种拖拽方式与位置，下面希望有需要的朋友可参考。

提示：您可以先修改部分代码再运行

<!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>拖拽库</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>  </td>  	  </tr>  	</table>

提示：您可以先修改部分代码再运行

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