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JavaScript 无缝上下滚动加定高停顿效果

2008-04-26 15:54 676 查看

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<head>

</head>

<body>

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 oScroll = this, oScroller = $(idScroller), oScrollMid = $(idScrollMid);

this.heightScroller = oScroller.offsetHeight;

this.heightList = oScrollMid.offsetHeight;

if(this.heightList <= this.heightScroller) return;

oScroller.style.overflow = "hidden";

oScrollMid.appendChild(oScrollMid.cloneNode(true));

this.oScroller = oScroller;

this.timer = null;

this.SetOptions(options);

this.side = 1;//1是上 -1是下

switch (this.options.Side)

{

case "down" :

this.side = -1;

break;

case "up" :

default :

this.side = 1;

}

addEventHandler(oScrollMid , "mouseover", function()

{ oScroll.Stop(); });

addEventHandler(oScrollMid , "mouseout", function()

{ oScroll.Start(); });

if(this.options.PauseStep <= 0 || this.options.PauseHeight <= 0) this.options.PauseStep = this.options.PauseHeight = 0;

this.Pause = 0;

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

Time: 20,//速度(越大越慢)

Side: "up",//滚动方向:"up"是上，"down"是下

PauseHeight: 0,//隔多高停一次

PauseStep: 1000//停顿时间(PauseHeight大于0该参数才有效)

};

Object.extend(this.options, options ||

{});

//滚动

Scroll: function()

{

var iScroll = this.oScroller.scrollTop, iHeight = this.heightList, time = this.options.Time, oScroll = this, iStep = this.options.Step * this.side;

if(this.side > 0)

{

if(iScroll >= (iHeight * 2 - this.heightScroller))

{ iScroll -= iHeight; }

} else

{

if(iScroll <= 0)

{ iScroll += iHeight; }

}

if(this.options.PauseHeight > 0)

{

if(this.Pause >= this.options.PauseHeight)

{

time = this.options.PauseStep;

this.Pause = 0;

} else

{

this.Pause += Math.abs(iStep);

this.oScroller.scrollTop = iScroll + iStep;

}

} else

{ this.oScroller.scrollTop = iScroll + iStep; }

this.timer = window.setTimeout(function()

{ oScroll.Scroll(); }, time);

//开始

Start: function()

{

this.Scroll();

//停止

Stop: function()

{

clearTimeout(this.timer);

}

};

window.onload = function()

{

new Scroller("idScroller", "idScrollMid",

{ PauseHeight:25 });

}

</script>

<style>

#idScroller *

{margin:0px; padding:0px;}

#idScroller

{line-height:25px;width:500px; height:50px; overflow:hidden; border:1px solid #000000;}

#idScroller ul

{width:100%}

#idScroller li

{width:50%; float:left; overflow:hidden; list-style:none;}

</style>

<ul>

</ul>

</div>

</body>

</html>

效果

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