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js实现的拖动后记录轨迹并运行

2010-06-04 19:11:47 作者：

轨迹拖动（拖影效果）

效果如图所示:

演示代码:

<!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=gb2312" /> 
<title>拖动_轨迹运行</title> 
<style type="text/css"> 
* {margin:0px;padding:0px;} 
#div1 {position:relative;left:200px;top:200px;width:100px; height:100px; background-color:#f60;cursor:move;} 
</style> 
<script type="text/javascript"> 
var isIE = (document.all)?true:false; 
var $ID = function(id){ 
return "string"==typeof id?document.getElementById(id):id; 
} 
var Class = { 
create:function(){ 
return function(){ 
this.initilize.apply(this,arguments); 
} 
} 
} 
var Extend = function(destination, source){ 
for(var property in source){ 
destination[property] = source[property]; 
} 
} 
var Bind = function(object,fun){ 
var args = Array.prototype.slice.call(arguments).slice(2); 
return function(){ 
return fun.apply(object,args); 
} 
} 
var BindAsEventListener = function(object,fun){ 
var args = Array.prototype.slice.call(arguments).slice(2); 
return function(event){ 
return fun.apply(object,[event||window.event].concat(args)); 
} 
} 
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; 
} 
}; 
function getNodePosition(node,type){//type="left"or"top" 
var nodeTemp = node; 
var l = 0; 
var t = 0; 
while(nodeTemp!=document.body&&nodeTemp!=null){ 
l += nodeTemp.offsetLeft; 
t += nodeTemp.offsetTop; 
nodeTemp = nodeTemp.offsetParent; 
} 
if(type.toLowerCase()=="left") return l; 
else return t; 
} 
//前面通常都用一个base.js封装 
</script> 
<script type="text/javascript"> 
var MyDrag = Class.create(); 
MyDrag.prototype = { 
initilize:function(obj){ 
this.Obj = $ID(obj); 
this._x = this._y = 0; 
this._xx = this._yy = 0;//Move记录坐标 
this.Obj.style.position = "absolute"; 
this._pos = []; 
this._ifSavePos = true; 
this._t = null; 
this._speed = 10; 
this._indexMove = 0;//全局的MoveIndex 
this._fnStart = BindAsEventListener(this,this.Start); 
this._fnMove = BindAsEventListener(this,this.Move); 
this._fnStop = Bind(this,this.Stop); 
addEventHandler(this.Obj,"mousedown",this._fnStart); 
}, 
Start:function(oEvent){ 
if(!this._ifSavePos) 
this._pos = []; 
this.Drag = this.Obj.cloneNode(true); 
if(isIE) this.Drag.style.filter = "alpha(opacity=50)"; 
else this.Drag.style.opacity = "0.5"; 
this.Obj.parentNode.appendChild(this.Drag);

this._left1 = this._xx = getNodePosition(this.Obj,"left"); 
this._top1 = this._yy = getNodePosition(this.Obj,"top"); 
this._x = oEvent.clientX - this.Obj.offsetLeft; 
this._y = oEvent.clientY - this.Obj.offsetTop; 
addEventHandler(document,"mousemove",this._fnMove); 
addEventHandler(document,"mouseup",this._fnStop); 
this._t = setInterval(Bind(this,this.SavePos),10); 
}, 
SavePos:function(){//记录坐标点 
this._pos.push(this._xx + "_" + this._yy); 
}, 
Move:function(oEvent){ 
if(isIE) oEvent.returnValue = false; 
this._xx = oEvent.clientX - this._x; 
this._yy = oEvent.clientY - this._y; 
this.Drag.style.left = this._xx + "px"; 
this.Drag.style.top = this._yy + "px"; 
}, 
Stop:function(){ 
removeEventHandler(document,"mousemove",this._fnMove); 
removeEventHandler(document,"mouseup",this._fnStop); 
this.Obj.parentNode.removeChild(this.Drag); 
this.Obj.style.left = this._xx + "px"; 
this.Obj.style.top = this._yy + "px"; 
clearInterval(this._t); 
this._fnCloneMove = Bind(this,this.CloneMove); 
this._t = setTimeout(this._fnCloneMove,50); 
}, 
CloneMove:function(){ 
if(this._indexMove<6){ 
new ObjMove({x1:this._left1,y1:this._top1,x2:this._xx,y2:this._yy,pos:this._pos}); 
this._indexMove++; 
this._t = setTimeout(this._fnCloneMove,50); 
}else{ 
clearTimeout(this._t); 
this._indexMove = 0; 
} 
} 
} 
var ObjMove = Class.create(); 
ObjMove.prototype = { 
initilize:function(options){ 
this.SetOptions(options); 
this.Obj = document.createElement("DIV"); 
this.Obj.style.cssText = "position:absolute;left:"+ this.options.x1 +"px;top:"+ this.options.y1 +"px;width:100px;height:100px;background-color:#f60;fliter:alpha(opacity=100);opacity:1;"; 
document.body.appendChild(this.Obj); 
this.Move2(); 
}, 
SetOptions: function(options) { 
this.options = {//默认值 
x1: 0, 
y1: 0, 
x2: 0, 
y2: 0, 
pos: [] 
}; 
Extend(this.options, options || {}); 
}, 
Move2:function(){ 
this._indexMove = 0; 
this._fnMovePos = Bind(this,this.MovePos); 
this._t = setInterval(this._fnMovePos,10); 
}, 
MovePos:function(){ 
if(this._indexMove>=this.options.pos.length){ 
this.options.pos = []; 
document.body.removeChild(this.Obj); 
clearInterval(this._t); 
}else{ 
this.Obj.style.left = this.options.pos[this._indexMove].split("_")[0] + "px"; 
this.Obj.style.top = this.options.pos[this._indexMove].split("_")[1] + "px"; 
} 
this._indexMove++; 
} 
} 
onload = function(){ 
var myDrag = new MyDrag("div1"); 
$ID("rad1").onclick = function(){ 
myDrag._ifSavePos = true; 
} 
$ID("rad2").onclick = function(){ 
myDrag._ifSavePos = false; 
} 
} 
</script> 
</head> 
<body> 
<div>随意拖动那个小方块几秒钟</div> 
<label for="rad1"><input type="radio" id="rad1" name="rad" checked="checked"/>记住轨迹</label> 
<label for="rad2"><input type="radio" id="rad2" name="rad"/>不记住轨迹</label> 
<div id="div1"> 
</div> 
</body> 
</html>

[Ctrl+A 全选注:如需引入外部Js需刷新才能执行]