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js完美的div拖拽實例代碼
編輯:JavaScript綜合知識     

 文章實現的div拖拽程序可以根據按鈕來控制是要種拖拽方式與位置 ,下面希望有需要的朋友可參考

代碼如下: <!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>拖拽庫</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()  },  //參數設置  setOptions : function (options)  {   this.options =   {    handle:   this.drag, //事件對象    limit:   true, //鎖定范圍    lock:   false, //鎖定位置    lockX:   false, //鎖定水平位置    lockY:   false, //鎖定垂直位置    maxContainer: document.documentElement || document.body, //指定限制容器    onStart:  function () {}, //開始時回調函數    onMove:   function () {}, //拖拽時回調函數    onStop:   function () {}  //停止時回調函數   };   for (var p in options) this.options[p] = options[p]  },  //獲取id  $ : function (id)  {   return typeof id === "string" ? document.getElementById(id) : id  },  //添加綁定事件  addHandler : function (oElement, sEventType, fnHandler)  {   return oElement.addEventListener ? oElement.addEventListener(sEventType, fnHandler, false) : oElement.attachEvent("on" + sEventType, fnHandler)  },  //刪除綁定事件  removeHandler : function (oElement, sEventType, fnHandler)  {   return oElement.removeEventListener ? oElement.removeEventListener(sEventType, fnHandler, false) : oElement.detachEvent("on" + sEventType, fnHandler)  },  //綁定事件到對象  bind : function (object, fnHandler)  {   return function ()   {    return fnHandler.apply(object, arguments)    }  } };           //應用 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");    //鎖定范圍接口  aInput[0].onclick = function ()  {   oDrag.limit = !oDrag.limit;   this.value = oDrag.limit ? "取消鎖定范圍" : "鎖定范圍"  };    //水平鎖定接口  aInput[1].onclick = function ()  {   oDrag.lockX = !oDrag.lockX;   this.value = oDrag.lockX ? "取消水平鎖定" : "水平鎖定"  };    //垂直鎖定接口  aInput[2].onclick = function ()  {   oDrag.lockY = !oDrag.lockY;   this.value = oDrag.lockY ? "取消垂直鎖定" : "垂直鎖定"  };    //鎖定位置接口  aInput[3].onclick = function ()  {   oDrag.lock = !oDrag.lock;   this.value = oDrag.lock ? "取消鎖定位置" : "鎖定位置"  };    //開始拖拽時方法  oDrag.onStart = function ()  {   oSpan.innerHTML = "開始拖拽"   };    //開始拖拽時方法  oDrag.onMove = function ()  {   oSpan.innerHTML = "left:" + this.drag.offsetLeft + ", top:" + this.drag.offsetTop   };    //開始拖拽時方法  oDrag.onStop = function ()  {   oSpan.innerHTML = "結束拖拽"   }; }; </script> </head> <body> <div id="tool">  <input type="button" value="鎖定范圍" />     <input type="button" value="水平鎖定" />     <input type="button" value="垂直鎖定" />     <input type="button" value="鎖定位置" /> </div> <p>拖放狀態:<span>未開始</span></p> <div id="box">  <h2 class="title"></h2> </div> </body> </html> </td>    </tr>  </table>  
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