js 自定义滚动条(可左右拖动效果)

作者：袖梨 2022-06-25

提示：您可以先修改部分代码再运行

//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>

<div id="box">
    <div class="list">
        <ul>
            <li><p>iPhone 4</p></li>
            <li><p>iPad 2</p></li>
            <li><p>iPod touch</p></li>
            <li><p>iPod classic</p></li>
            <li><p>iPod shuffle</p></li>
            <li><p>iPod nano</p></li>
            <li><p>MacBook Air</p></li>
            <li><p>MacBook Pro</p></li>
            <li><p>Mac mini</p></li>
            <li><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>

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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