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星鸿娱乐注册JavaScript实现的多种鼠标拖放效果

  var isIE=(document.all) ? true : false;  var $=function (id) {  return "string"==typeof id ? document.getElementById(id) : id;  };  var Class={  create: function() {  return function() { this.initialize.apply(this, arguments); }  }  }  var Extend=function(destination, source) {  for (var property in source) {  destination[property]=source[property];  }  }  var Bind=function(object, fun) { 星鸿娱乐注册 return function() {  return fun.apply(object, arguments);  }  }  var BindAsEventListener=function(object, fun) {  return function(event) {  return fun.call(object, (event || window.event));  }  }  var CurrentStyle=function(element){  return element.currentStyle || document.defaultView.getComputedStyle(element, null);  }  function addEventHandler(oTarget, sEventType, fnHandler) {  if (oTarget.addEventListener) {  oTarget.addEventListener(sEventType, fnHandler, false);  } else if (oTarget.attachEvent) {  oTarget.attachEvent("on" + sEventType, fnHandler);  } else {  oTarget["on" + sEventType]=fnHandler;  }  };  function removeEventHandler(oTarget, sEventType, fnHandler) {  if (oTarget.removeEventListener) {  oTarget.removeEventListener(sEventType, fnHandler, false);  } else if (oTarget.detachEvent) {  oTarget.detachEvent("on" + sEventType, fnHandler);  } else {  oTarget["on" + sEventType]=null;  }  };  //拖放程序  var Drag=Class.create();  Drag.prototype={  //拖放对象  initialize: function(drag, options) {  this.Drag=$(drag);//拖放对象  this._x=this._y=0;//记录鼠标相对拖放对象的位置  this._marginLeft=this._marginTop=0;//记录margin  //事件对象(用于绑定移除事件)  this._fM=BindAsEventListener(this, this.Move);  this._fS=Bind(this, this.Stop);  this.SetOptions(options);  this.Limit=!!this.options.Limit;  this.mxLeft=parseInt(this.options.mxLeft);  this.mxRight=parseInt(this.options.mxRight);  this.mxTop=parseInt(this.options.mxTop);  this.mxBottom=parseInt(this.options.mxBottom);  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=$(this.options.Handle) || this.Drag;  this._mxContainer=$(this.options.mxContainer) || null;  this.Drag.style.position="absolute";  //透明  if(isIE && !!this.options.Transparent){  //填充拖放对象  with(this._Handle.appendChild(document.createElement("div")).style){  width=height="100%"; backgroundColor="#fff"; filter="alpha(opacity:0)";  }  }  //修正范围  this.Repair();  addEventHandler(this._Handle, "mousedown", BindAsEventListener(this, this.Start));  },  //设置默认属性  SetOptions: function(options) {  this.options={//默认值  Handle: "",//设置触发对象(不设置则使用拖放对象)  Limit: false,//是否设置范围限制(为true时下面参数有用,可以是负数)  mxLeft: 0,//左边限制  mxRight: 9999,//右边限制  mxTop: 0,//上边限制  mxBottom: 9999,//下边限制  mxContainer: "",//指定限制在容器内  LockX: false,//是否锁定水平方向拖放  LockY: false,//是否锁定垂直方向拖放  Lock: false,//是否锁定  Transparent: false,//是否透明  onStart: function(){},//开始移动时执行  onMove: function(){},//移动时执行  onStop: function(){}//结束移动时执行  };  Extend(this.options, options || {});  },  //准备拖动  Start: function(oEvent) {  if(this.Lock){ return; }  this.Repair();  //记录鼠标相对拖放对象的位置  this._x=oEvent.clientX - this.Drag.offsetLeft;  this._y=oEvent.clientY - this.Drag.offsetTop;  //记录margin  this._marginLeft=parseInt(CurrentStyle(this.Drag).marginLeft) || 0;  this._marginTop=parseInt(CurrentStyle(this.Drag).marginTop) || 0;  //mousemove时移动 mouseup时停止  addEventHandler(document, "mousemove", this._fM);  addEventHandler(document, "mouseup", this._fS);  if(isIE){  //焦点丢失  addEventHandler(this._Handle, "losecapture", this._fS);  //设置鼠标捕获  this._Handle.setCapture();  }else{  //焦点丢失  addEventHandler(window, "blur", this._fS);  //阻止默认动作  oEvent.preventDefault();  };  //附加程序  this.onStart();  },  //修正范围  Repair: function() {  if(this.Limit){  //修正错误范围参数  this.mxRight=Math.max(this.mxRight, this.mxLeft + this.Drag.offsetWidth);  this.mxBottom=Math.max(this.mxBottom, this.mxTop + this.Drag.offsetHeight);  //如果有容器必须设置position为relative来相对定位,并在获取offset之前设置  !this._mxContainer || CurrentStyle(this._mxContainer).position=="relative" || (this._mxContainer.style.position="relative");  }  },  //拖动  Move: function(oEvent) {  //判断是否锁定  if(this.Lock){ this.Stop(); return; };  //清除选择  window.getSelection ? window.getSelection().removeAllRanges() : document.selection.empty();  //设置移动参数  var iLeft=oEvent.clientX - this._x, iTop=oEvent.clientY - this._y;  //设置范围限制  if(this.Limit){  //设置范围参数  var mxLeft=this.mxLeft, mxRight=this.mxRight, mxTop=this.mxTop, mxBottom=this.mxBottom;  //如果设置了容器,再修正范围参数  if(!!this._mxContainer){  mxLeft=Math.max(mxLeft, 0);  mxTop=Math.max(mxTop, 0);  mxRight=Math.min(mxRight, this._mxContainer.clientWidth);  mxBottom=Math.min(mxBottom, this._mxContainer.clientHeight);  };  //修正移动参数  iLeft=Math.max(Math.min(iLeft, mxRight - this.Drag.offsetWidth), mxLeft);  iTop=Math.max(Math.min(iTop, mxBottom - this.Drag.offsetHeight), mxTop);  }  //设置位置,并修正margin  if(!this.LockX){ this.Drag.style.left=iLeft - this._marginLeft + "px"; }  if(!this.LockY){ this.Drag.style.top=iTop - this._marginTop + "px"; }  //附加程序  this.onMove();  },  //停止拖动  Stop: function() {  //移除事件  removeEventHandler(document, "mousemove", this._fM);  removeEventHandler(document, "mouseup", this._fS);  if(isIE){  removeEventHandler(this._Handle, "losecapture", this._fS);  this._Handle.releaseCapture();  }else{  removeEventHandler(window, "blur", this._fS);  };  //附加程序  this.onStop();  }  };    

  
  
              
拖放状态:未开始  var drag=new Drag("idDrag", { mxContainer: "idContainer", Handle: "idHandle", Limit: true,  onStart: function(){ $("idShow").innerHTML="开始拖放"; },  onMove: function(){ $("idShow").innerHTML="left:"+this.Drag.offsetLeft+";top:"+this.Drag.offsetTop; },  onStop: function(){ $("idShow").innerHTML="结束拖放"; }  });  $("idReset").onclick=function(){  drag.Limit=true;  drag.mxLeft=drag.mxTop=0;  drag.mxRight=drag.mxBottom=9999;  drag.LockX=drag.LockY=drag.Lock=false;  }  $("idLock").onclick=function(){ drag.Lock=true; }  $("idLockX").onclick=function(){ drag.LockX=true; }  $("idLockY").onclick=function(){ drag.LockY=true; }  $("idLimit").onclick=function(){ drag.mxRight=drag.mxBottom=200;drag.Limit=true; }  $("idLimitOff").onclick=function(){ drag.Limit=false; }  

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