js走马灯

转载地址:
http://www.cnblogs.com/cloudgamer/archive/2008/04/30/1177682.html

<!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() {
//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);
}
};
window.onload = function(){
new Scroller(“idScroller”, “idScrollMid”,{ Side:[“up”,“left”], PauseHeight:50, PauseWidth:400 });
}
</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;}
</style>
<div id=“idScroller” class=“Scroller” style=“width:400px; height:50px;”>
<div style=“width:1600px”>
<div id=“idScrollMid” class=“ScrollMid”>
<ul>
<li>111111111111</li>
<li>2222222222222</li>
<li>333333333333333</li>
<li>4444444444444</li>
</ul>
</div>
</div>
</div>
<div id=“test”></div>
</body>
</html>