js 自定义滚动条(可左右拖动效果)

作者：简简单单 2013-09-12

提示：您可以先修改部分代码再运行

<!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=utf-8" />
<title>自定义滚动条</title>
<style type="text/<a href="http://www.111com.net/cssdiv/css.html" target="_blank">css</a>">
body,div,ul,li,p{margin:0;padding:0;}
body{background:#3e3e3e;font:14px/1.5 5fae8f6f96c59ed1;}
#box{margin:20px auto;}
.list{position:relative;margin-bottom:10px;overflow:hidden;border-radius:8px;}
.list ul{position:absolute;top:0;left:0;}
.list li{display:inline;float:left;list-style:none;background:#000;margin-right:8px;border-radius:8px;}
.list li img{float:left;border-radius:5px;margin:10px 0 0 10px;}
.list li p{float:left;color:#fff;width:100%;text-align:center;line-}
.scrollBar{position:relative;background:#0a0a0a;overflow:hidden;}
.scrollBar .barL,.scrollBar .barR,.scrollBar .barLStop,.scrollBar .barRStop{position:absolute;top:0;cursor:pointer;background:url(img/03.gif) no-repeat;}
.scrollBar .barL{left:0;}
.scrollBar .barR{right:0;background-position:right 0;}
.scrollBar .barLStop{left:0;background-position:0 -19px;cursor:default;}
.scrollBar .barRStop{right:0;background-position:right -19px;cursor:default;}
.scrollBar .barM{position:relative;border:1px solid #545454;border-0;margin:0 28px;padding:1px 0;z-index:1;cursor:pointer;}
.scrollBar .bar{position:absolute;top:1px;left:0;cursor:e-resize;background:url(img/01.gif) repeat-x;}
.scrollBar .bar .l,.scrollBar .bar .r{position:absolute;top:0;background:url(img/02.gif) no-repeat;}
.scrollBar .bar .l{left:-6px;}
.scrollBar .bar .r{right:-6px;background-position:right 0;}
#desc{color:#ccc;padding:10px;margin:0 auto;line-height:2;border:1px dashed #666;}
#desc dd{margin-left:2em;}
.ta-r{text-align:right;}
</style>
<script type="text/javascript">
/*-------------------------- +
  获取id, class, tagName
 +-------------------------- */
var get = {
	byId: function(id) {
		return typeof id === "string" ? document.getElementById(id) : id
	},
	byClass: function(sClass, oParent) {
		var aClass = [];
		var reClass = new RegExp("(^| )" + sClass + "( |$)");
		var aElem = this.byTagName("*", oParent);
		for (var i = 0; i < aElem.length; i++) reClass.test(aElem[i].className) && aClass.push(aElem[i]);
		return aClass
	},
	byTagName: function(elem, obj) {
		return (obj || document).getElementsByTagName(elem)
	}
};
/*-------------------------- +
  获取最终样式
 +-------------------------- */
function getStyle(obj, attr)
{
	return parseFloat(obj.currentStyle ? obj.currentStyle[attr] : getComputedStyle(obj, null)[attr])	
}
window.onload = function ()
{
	var oBox = get.byId("box");
	var oScrollBar = get.byClass("scrollBar", oBox)[0];
	var oList = get.byClass("list", oBox)[0];
	var oUl = get.byTagName("ul", oBox)[0];
	var aLi = get.byTagName("li", oBox);
	var oBarL = get.byClass("barL", oScrollBar)[0];
	var oBarM = get.byClass("barM", oScrollBar)[0];
	var oBarR = get.byClass("barR", oScrollBar)[0];
	var oBar = get.byClass("bar", oBarM)[0];
	var maxL = oBarM.offsetWidth - oBar.offsetWidth;
	var iMarginRight = getStyle(aLi[0], "marginRight");
	var timer = null;
	var iScale = 0;
	var disX = 0;
	var i = 0;
	
	//图片列表容器动态设置宽度
	oUl.style.px";
	
	//拖动滚动条
	oBar.onmousedown = function (event)
	{
		var event = event || window.event;
		disX = event.clientX - oBar.offsetLeft;		
		document.onmousemove = function (event)
		{
			var event = event || window.event;
			var iL = event.clientX - disX;			
			iL <= 0 && (iL = 0);
			iL >= maxL && (iL = maxL);
			oBar.style.left = iL + "px";
			iScale = iL / maxL;			
			return false
		};		
		document.onmouseup = function ()
		{
			startMove(oUl, parseInt((oList.offsetWidth + iMarginRight - oUl.offsetWidth) * iScale));
			isStop();
			document.onmousemove = null;
			document.onmouseup = null
		};
		return false
	};
	//阻止滚动条点击事件冒泡
	oBar.onclick = function (event)
	{
		(event || window.event).cancelBubble = true
	};

//滚动条左右按钮鼠标移入及键盘左右键按下事件
	oBarL.onmouseover = oBarR.onmouseover = document.onkeydown = function (event)
	{
		clearInterval(timer);
		var event = event || window.event;
		var iSpeed = 0;
		if (this == oBarR || event.keyCode == 39)
		{
			iSpeed = 5
		}
		else if(this == oBarL || event.keyCode == 37)
		{
			iSpeed = -5
		}
		timer = setInterval(function ()
		{
			togetherMove(getStyle(oBar, "left") + iSpeed, 1)	
		}, 30)
	};
	//滚动条左右按钮鼠标移开及键盘左右键抬起事件
	oBarL.onmouseout = oBarR.onmouseout = document.onkeyup = function ()
	{
		clearInterval(timer)	
	};	
	
	//滚动条可移动区域点击事件
	oBarM.onclick = function (event)
	{
		var iTarget = (event || window.event).clientX - oBox.offsetLeft - this.offsetLeft - oBar.offsetWidth / 2;
		togetherMove(iTarget)
	};
	
	//鼠标滚轮事件
	oBox.onmouseover = function (event)
	{
		event = event || window.event;		
		function mouseWheel(event)
		{
			var delta = event.wheelDelta ? event.wheelDelta : -event.detail * 40
			var iTarget = delta > 0 ? -50 : 50;
			togetherMove(oBar.offsetLeft + iTarget)
		}
		addHandler(this, "mousewheel", mouseWheel);
		addHandler(this, "DOMMouseScroll", mouseWheel);
	};	
	
	//图片列表和流动条同时移动
	function togetherMove(iTarget, buffer)
	{
		if (iTarget <= 0)
		{
			timer && clearInterval(timer);
			iTarget = 0
		}
		else if (iTarget >= maxL)
		{
			timer && clearInterval(timer);
			iTarget	= maxL
		}
		iScale = iTarget / maxL;
		startMove(oUl, parseInt((oList.offsetWidth + iMarginRight - oUl.offsetWidth) * iScale), function () {isStop()}, buffer);
		startMove(oBar, iTarget, function () {isStop()}, buffer)
	}
	
	//判断滚动条是否到达边界
	function isStop()
	{
		oBarL.className = "barL";
		oBarR.className = "barR";
		switch (oBar.offsetLeft)
		{
			case 0:
				/(^|s)barLStop(s|$)/.test(oBarL.className) || (oBarL.className += " barLStop");
				break;
			case maxL:
				/(^|s)barRStop(s|$)/.test(oBarR.className) || (oBarR.className += " barRStop");
				break;
		}
	}
	isStop()
};
function addHandler(element, type, handler)
{
	return element.addEventListener ? element.addEventListener(type, handler, false) : element.attachEvent("on" + type, handler)
}
function startMove(obj, iTarget, fnEnd, buffer)
{
	clearInterval(obj.timer);
	obj.timer = setInterval(function ()
	{
		doMove(obj, iTarget, fnEnd, buffer)	
	}, 25)
}
function doMove(obj, iTarget, fnEnd, buffer)
{
	var iLeft = getStyle(obj, "left");
	var iSpeed = (iTarget - iLeft) / (buffer || 5);
	iSpeed = iSpeed > 0 ? Math.ceil(iSpeed) : Math.floor(iSpeed);
	iLeft == iTarget ? (clearInterval(obj.timer), fnEnd && fnEnd()) : obj.style.left = iLeft + iSpeed + "px"
}
</script>
</head>
<body>
<div id="box">
    <div class="list">
        <ul>
            <li><a href="img/1.jpg" class="js-smartPhoto" target="_blank"><img  src="img/1.jpg" /></a><p>iPhone 4</p></li>
            <li><a href="img/2.jpg" class="js-smartPhoto" target="_blank"><img  src="img/2.jpg" /></a><p>iPad 2</p></li>
            <li><a href="img/3.jpg" class="js-smartPhoto" target="_blank"><img  src="img/3.jpg" /></a><p>iPod touch</p></li>
            <li><a href="img/4.jpg" class="js-smartPhoto" target="_blank"><img  src="img/4.jpg" /></a><p>iPod classic</p></li>
            <li><a href="img/5.jpg" class="js-smartPhoto" target="_blank"><img  src="img/5.jpg" /></a><p>iPod shuffle</p></li>
            <li><a href="img/6.jpg" class="js-smartPhoto" target="_blank"><img  src="img/6.jpg" /></a><p>iPod nano</p></li>
            <li><a href="img/7.jpg" class="js-smartPhoto" target="_blank"><img  src="img/7.jpg" /></a><p>MacBook Air</p></li>
            <li><a href="img/8.jpg" class="js-smartPhoto" target="_blank"><img  src="img/8.jpg" /></a><p>MacBook Pro</p></li>
            <li><a href="img/9.jpg" class="js-smartPhoto" target="_blank"><img  src="img/9.jpg" /></a><p>Mac mini</p></li>
            <li><a href="img/10.jpg" class="js-smartPhoto" target="_blank"><img  src="img/10.jpg" /></a><p>Mac Pro</p></li>
        </ul>
    </div>
    
    <div class="scrollBar">
        <div class="barL"></div>
        <div class="barM">
            <div class="bar">
                <div class="l"></div>
                <div class="r"></div>
            </div>
        </div>
        <div class="barR"></div>
    </div>
    
</div>

<dl id="desc">
    <dt>功能说明：</dt>
    <dd>① 拖动滚动条，图片列表缓冲滑动至目标点；</dd>
    <dd>② 滚动条两端鼠标移入自动滑动；</dd>
    <dd>③ 滚动条滑动到两端自动更换为停止标识；</dd>
    <dd>④ 点击滚动条黑色背景区，滚动条及图片列表缓冲滑动至目标点；</dd>
    <dd>⑤ 支持键盘左右键；</dd>
    <dd>⑥ 支持鼠标滚轮。</dd>
    <dd class="ta-r">QQ:173045138, 铁马网络</dd>
</dl>
</body>
</html></td>
	  </tr>
	</table>

提示：您可以先修改部分代码再运行

js 自定义滚动条(可左右拖动效果)

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