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JavaScript 无缝上下左右滚动加定高定宽停顿效果

2012-06-02 03:50 721 查看

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

<head>

<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>

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));

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>

<ul>

</ul>

</div>

</body>

</html>

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