JavaScript 无缝上下滚动加定高停顿效果

来源：互联网发布：淘宝货款可以提现吗编辑：程序博客网时间：2024/04/30 21:37

<!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