js(javascript)实现的列表文字上下滚动并加定高定宽停顿效果
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<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title></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 = source;
}
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>
<div id="idScroller">
<div id="idScrollMid">
<ul>
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</ul>
<div style="clear:both;"></div>
</div>
</div>
</body>
</html>
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