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JavaScript打造有軌跡的拖動特效_瀏覽器特效

JavaScript打造有軌跡的拖動特效，隨意拖動小方塊移動幾秒鐘，如果此時選擇記住規(guī)則的話，那么重新拖動后，方塊會從沿著上次的拖動路線行進，有人說這是玩弄瀏覽器東西，不過看來好像很有趣，親自試一下吧。

<!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" mrc="text/html; charset=gb2312" />
<title>拖動</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;
}
</script>
<script type="text/javascript">
//這里可以封裝
var MyDrag = Class.create();
MyDrag.prototype = {
	initilize:function(obj){
		this.Obj = $ID(obj);
		this._x = this._y = 0;
		this._xx = this._yy = 0;//Move記錄坐標(biāo)
		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(){//記錄坐標(biāo)
		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 = {//默認(rèn)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>
<label for="rad1"><input type="radio" id="rad1" name="rad" checked="checked"/>記住軌跡</label>
<label for="rad2"><input type="radio" id="rad2" name="rad"/>不記軌跡</label>
<div id="div1">
</div>
</body>
</html>

所屬頻道：瀏覽器特效/更新時間：2013-04-17

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