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JavaScript 无缝上下左右滚动加定高定宽停顿效果

　2009-05-06 20:12:06　来源：WEB开发网　　　

核心提示：代码：程序代码<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><h

代码：

程序代码
<!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>javaScript 无缝上下左右滚动加定高定宽停顿效果(兼容ie/ff)</title>
</head>
<body>
<SCRIPT type=text/Javascript>
var $ = function (id) {
　 return "string" == typeof id ? document.getElementById(id) : id;
};
var Class = {
create: function() {
　 return function() {
　　 this.initialize.apply(this, arguments);
　 }
}
}
Object.extend = function(destination, source) {
for (var PRoperty in source) {
destination[property] = source[property];
}
return destination;
}
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;
}
};

var Scroller = Class.create();
Scroller.prototype = {
initialize: function(idScroller, idScrollMid, options) {
　 var oThis = this, oScroller = $(idScroller), oScrollMid = $(idScrollMid);

this.SetOptions(options);
this.Side = this.options.Side || ["up"];//方向
this.scroller = oScroller;　 //对象
this.speed = this.options.Speed; //速度
this.timer = null;　　 //时间
this.pauseHeight = 0;　 //定高
this.pauseWidth = 0;　 //定宽
this.pause = 0;　　 //定高(宽)
this.side = 0;　　 //参数

//用于上下滚动
this.heightScroller = parseInt(oScroller.style.height) || oScroller.offsetHeight;
this.heightList = oScrollMid.offsetHeight;

//用于左右滚动
this.widthScroller = parseInt(oScroller.style.width) || oScroller.offsetWidth;
this.widthList = oScrollMid.offsetWidth;

//js取不到CSS设置的height和width

oScroller.style.overflow = "hidden";
oScrollMid.appendChild(oScrollMid.cloneNode(true));
oScrollMid.appendChild(oScrollMid.cloneNode(true));

addEventHandler(oScroller, "mouSEOver", function() { oThis.Stop(); });
addEventHandler(oScroller, "mouseout", function() { oThis.Start(); });

this.Start();
},
//设置默认属性
SetOptions: function(options) {
　 this.options = {//默认值
　 Step:　 1,//每次变化的px量
　 Speed: 20,//速度(越大越慢)
　 Side:　 ["up"],//滚动方向:"up"是上，"down"是下，"left"是左，"right"是右
　 PauseHeight: 0,//隔多高停一次
　 PauseWidth: 0,//隔多宽停一次
　 //当上下和左右一起使用时必须设置PauseHeight和PauseWidth来设置转向位置
　 PauseStep: 1000//停顿时间(PauseHeight或PauseWidth大于0该参数才有效)
　 };
　 Object.extend(this.options, options || {});
},
//转向
Turn: function() {
//通过设置方向数组的排列来转向
this.Side.push(this.Side.shift().toLowerCase());
},
//上下滚动
ScrollUpDown: function() {
this.pause = this.pauseHeight;
this.scroller.scrollTop = this.GetScroll(this.scroller.scrollTop, this.heightScroller, this.heightList, this.options.PauseHeight);
this.pauseHeight = this.pause;

var oThis = this;
this.timer = window.setTimeout(function(){ oThis.Start(); }, this.speed);
},
//左右滚动
ScrollLeftRight: function() {
this.pause = this.pauseWidth;
//注意:scrollLeft超过1400会自动变回1400 注意长度
this.scroller.scrollLeft = this.GetScroll(this.scroller.scrollLeft, this.widthScroller, this.widthList, this.options.PauseWidth);
this.pauseWidth = this.pause;

var oThis = this;
this.timer = window.setTimeout(function(){ oThis.Start(); }, this.speed);
},
//获取设置滚动数据
GetScroll: function(iScroll, iScroller, iList, iPause) {
var iStep = this.options.Step * this.side;

if(this.side > 0){
if(iScroll >= (iList * 2 - iScroller)){ iScroll -= iList; }
} else {
if(iScroll <= 0){ iScroll += iList; }
}

this.speed = this.options.Speed;
if(iPause > 0){
if(Math.abs(this.pause) >= iPause){
　 this.speed = this.options.PauseStep; this.pause = iStep = 0; this.Turn();
} else {
　 this.pause += iStep;
}
}

return (iScroll + iStep);
},
//开始
Start: function() {

//document.getElementById("test").innerHTML+=sTurn+",";

//方向设置
switch (this.Side[0].toLowerCase()) {
case "right" :
　 if(this.widthList < this.widthScroller) return;
　 this.side = -1;
　 this.ScrollLeftRight();
　 break;
case "left" :
　 if(this.widthList < this.widthScroller) return;
　 this.side = 1;
　 this.ScrollLeftRight();
　 break;
case "down" :
　 if(this.heightList < this.heightScroller) return;
　 this.side = -1;
　 this.ScrollUpDown();
　 break;
case "up" :
default :
　 if(this.heightList < this.heightScroller) return;
　 this.side = 1;
　 this.ScrollUpDown();
}
},
//停止
Stop: function() {
clearTimeout(this.timer);
}
};
</SCRIPT>

<STYLE>
.Scroller {line-height:50px; border:1px solid #000000; padding:0px 10px; height:50px; width:400px;}
.Scroller *{margin:0px; padding:0px;}
.ScrollMid {float:left;}
.ScrollMid ul{width:800px;float:left;}
.ScrollMid li{list-style:none; float:left; width:390px; padding-left:10px;line-height:50px; }
</STYLE>

<DIV class=Scroller id=idScroller>
<DIV style="WIDTH: 1600px">
<DIV class=ScrollMid id=idScrollMid>
<UL>
<LI>顺德于1993年被批准为广东省综合改革试点。 </LI>
<LI>2006年顺德成为首个GDP超过1000亿的县级行政单位。 </LI>
<LI>2000至2003年顺德均在中国百强县排名中位居榜首。 </LI>
<LI>2005年顺德实现国内生产总值856.11亿元。 </LI></UL></DIV></DIV></DIV>
<SCRIPT>
new Scroller("idScroller", "idScrollMid",{ Side:["up","left"], PauseHeight:50, PauseWidth:400 });
</SCRIPT>
</body>
</html>