图片自定义滚动条3.0

大中小文章来源：中国互联更新时间：2011-8-18 14:30:33

运行代码框
<!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></title> <style type="text/css"> * { margin:0; padding:0; } body { margin:20px 0 400px 20px; font:12px Arial; } h1 { font-size:14px; } ol,ul { margin:20px; line-height:160%; } ul li { color:#f00; } .a1 { width:300px; height:190px; border:1px solid #f00; overflow:auto; } .a2 { width:600px; height:350px; margin:100px 0 100px 80px; border:1px solid #369; background:#eee url(http://www.webjx.com/files/090716/1_161829.gif) no-repeat 50%; overflow:auto; } .dumascroll {} /*只需对需要渲染滚动条的div设置该class即可*/ .dumascroll_area { height:100%; overflow:hidden; } .dumascroll_bar,.dumascroll_handle,.dumascroll_handle_a,.dumascroll_arrow_up,.dumascroll_arrow_up_a,.dumascroll_arrow_down,.dumascroll_arrow_down_a { background-image:url(http://www.webjx.com/files/090716/1_161603.gif); } .dumascroll_bar { position:absolute; top:0; right:0; z-index:9; width:14px; height:100%; cursor:default; -moz-user-select:none; -khtml-user-select:none; user-select:none; background-repeat:repeat-y; background-position:-42px 0; float:left; } .dumascroll_arrow_up,.dumascroll_arrow_up_a,.dumascroll_handle,.dumascroll_handle_a,.dumascroll_arrow_down,.dumascroll_arrow_down_a { position:absolute; left:0; } .dumascroll_arrow_up,.dumascroll_arrow_up_a,.dumascroll_arrow_down,.dumascroll_arrow_down_a { width:100%; height:14px; color:#fff; text-align:center; } .dumascroll_arrow_up,.dumascroll_arrow_up_a { top:0; } .dumascroll_arrow_down,.dumascroll_arrow_down_a { bottom:0; } .dumascroll_handle,.dumascroll_handle_a { width:100%; background-repeat:repeat-y; } .dumascroll_arrow_up { background-position:0 0; } .dumascroll_arrow_up_a { background-position:-14px 0; } .dumascroll_handle { background-position:-28px 0; } .dumascroll_handle_a { background-position:-56px 0; } .dumascroll_arrow_down { background-position:-70px 0; } .dumascroll_arrow_down_a { background-position:-84px 0; } </style> <script> var duma = { $:function(o){ if(document.getElementById(o)) {return document.getElementById(o);} }, getStyle:function(o) { return o.currentStyle||document.defaultView.getComputedStyle(o,null); }, getOffset:function(o) { var t = o.offsetTop,h = o.offsetHeight; while(o = o.offsetParent) { t += o.offsetTop; } return { top:t, height:h }; }, bind:function(o,eType,fn) { if(o.addEventListener) { o.addEventListener(eType,fn,false); } else if(o.attachEvent) { o.attachEvent("on" + eType,fn); } else { o["on" + eType] = fn; } }, stopEvent:function(e) { e = e || window.event; e.stopPropagation && (e.preventDefault(),e.stopPropagation()) || (e.cancelBubble = true,e.returnValue = false); }, setCookie:function(c_name,value,expiredays) { var exdate = new Date(); exdate.setDate(exdate.getDate() + expiredays); document.cookie = c_name + "=" + escape(value) + ((expiredays == null) ? "" : ";expires=" + exdate.toGMTString()); }, getCookie:function(c_name) { if(document.cookie.length > 0) { c_start = document.cookie.indexOf(c_name + "="); if(c_start != -1) { c_start = c_start + c_name.length + 1; c_end = document.cookie.indexOf(";",c_start); if(c_end == -1) { c_end = document.cookie.length; } return unescape(document.cookie.substring(c_start,c_end)); } } return ""; } }; duma.BeautifyScrollBar = function(obj,arrowUpCss,arrowUpActiveCss,handleCss,handleActiveCss,arrowDownCss,arrowDownActiveCss) { this.arrowUpInterval; this.arrowDownInterval; this.barMouseDownInterval; this.relY; this.id = obj; this.obj = duma.$(this.id); this.setObjCss(); //预先设置父容器的css定位才能让接下来的属性设置起作用 this.obj.innerHTML = '<div id="' + obj + 'Area" class="dumascroll_area">' + this.obj.innerHTML + '</div><div id="' + obj + 'Bar" class="dumascroll_bar"><div class="dumascroll_arrow_up"></div><div class="dumascroll_handle"></div><div class="dumascroll_arrow_down"></div></div>'; this.area = duma.$(obj + "Area"); this.bar = duma.$(obj + "Bar"); this.barPos; this.arrowUp = this.bar.getElementsByTagName("div")[0]; this.arrowUpCss = arrowUpCss; this.arrowUpActiveCss = arrowUpActiveCss; this.handle = this.bar.getElementsByTagName("div")[1]; this.handleCss = handleCss; this.handleActiveCss = handleActiveCss; this.arrowDown = this.bar.getElementsByTagName("div")[2]; this.arrowDownCss = arrowDownCss; this.arrowDownActiveCss = arrowDownActiveCss; this.handleMinHeight = 15; this.arrowUpHeight = parseInt(duma.getStyle(this.arrowUp).height); this.arrowDownHeight = parseInt(duma.getStyle(this.arrowDown).height); this.areaScrollHeight = this.area.scrollHeight; this.handleHeight = parseInt(this.area.offsetHeight/this.area.scrollHeight * (this.bar.offsetHeight - this.arrowUpHeight - this.arrowDownHeight)); } duma.BeautifyScrollBar.prototype = { setObjCss:function() { duma.getStyle(this.obj).position == "static" ? this.obj.style.position = "relative" : duma.getStyle(this.obj).backgroundColor == "transparent" ? this.obj.style.backgroundColor = "#fff" : null; //若容器本来就没有设position，则初始化为relative；若容器原来未设置背景色，则初始化为白色； }, sethandle:function() { //当内容超多时设置拖拽条子的最小高度 this.handle.style.top = this.arrowUpHeight + "px"; if(this.handleHeight > this.handleMinHeight) { this.handleHeight < this.bar.offsetHeight - this.arrowUpHeight - this.arrowDownHeight ? this.handle.style.height = this.handleHeight + "px" : this.handle.style.display = "none"; } else { this.handleHeight = this.handleMinHeight; this.handle.style.height = this.handleMinHeight + "px"; } }, setBarPos:function() { //将当前滚动的距离值存入cookie this.barPos = this.area.scrollTop + ""; duma.setCookie(this.id + "CookieName",this.barPos,1); }, getBarPos:function() { this.barPos = duma.getCookie(this.id + "CookieName"); if(this.barPos!=null && this.barPos!="") { this.area.scrollTop = this.barPos; this.areaScroll(); } }, clearArrowUpInterval:function() { clearInterval(this.arrowUpInterval); }, clearArrowDownInterval:function() { clearInterval(this.arrowDownInterval); }, clearBarMouseDownInterval:function() { clearInterval(this.barMouseDownInterval); }, areaScroll:function() { this.handle.style.display != "none" ? this.handle.style.top = this.area.scrollTop/(this.area.scrollHeight - this.area.offsetHeight) * (this.bar.offsetHeight - this.handleHeight - this.arrowUpHeight - this.arrowDownHeight) + this.arrowUpHeight + "px" : null; }, areakeydown:function(e) { //支持键盘上下按键 var that = this; document.onkeydown = function(event) { var e = event || window.event, ek = e.keyCode || e.which; if(ek == 40) { that.area.scrollTop += 25 } else if(ek == 38) { that.area.scrollTop -= 25 } if(that.area.scrollTop > 0 && that.area.scrollTop < that.area.scrollHeight - that.area.offsetHeight){ duma.stopEvent(e); } that.setBarPos(); } }, handleMove:function(e) { var e = e || window.event; this.area.scrollTop = (e.clientY - this.relY - this.arrowUpHeight)/(this.bar.offsetHeight - this.handleHeight - this.arrowUpHeight - this.arrowDownHeight)*(this.area.scrollHeight - this.area.offsetHeight); this.setBarPos(); }, handleMouseDown:function(e) { var that = this,e = e || window.event; that.relY = e.clientY - that.handle.offsetTop; that.handle.setCapture ? that.handle.setCapture() : null; that.handle.className = that.handleActiveCss; document.onmousemove = function(event) { that.handleMove(event); }; document.onmouseup = function() { that.handle.className = that.handleCss; that.handle.releaseCapture ? that.handle.releaseCapture() : null; document.onmousemove = null; }; }, barScroll:function(e) { var e = e || window.event,eDir; //设置滚轮事件,e.wheelDelta与e.detail分别兼容IE、W3C，根据返回值的正负来判断滚动方向 if(e.wheelDelta) { eDir = e.wheelDelta/120; } else if(e.detail) { eDir = -e.detail/3; } eDir > 0 ? this.area.scrollTop -= 80 : this.area.scrollTop += 80; //步长设80像素比较接近window滚动条的滚动速度 if(this.area.scrollTop > 0 && this.area.scrollTop < this.area.scrollHeight - this.area.offsetHeight){ duma.stopEvent(e); } this.setBarPos(); }, barDown:function(e) { var e = e || window.event,that = this, eY = e.clientY, mStep = this.bar.offsetHeight, documentScrollTop = document.documentElement.scrollTop || document.body.scrollTop, hOffset = duma.getOffset(this.handle), bOffset = duma.getOffset(this.bar); if(documentScrollTop + eY < hOffset.top) { this.barMouseDownInterval = setInterval(function(e){ that.area.scrollTop -= that.area.offsetHeight; if(that.area.scrollTop <= (eY + documentScrollTop - bOffset.top - that.arrowUpHeight)/(that.bar.offsetHeight - that.arrowUpHeight - that.arrowDownHeight) * that.area.scrollHeight) { that.clearBarMouseDownInterval(); } that.setBarPos(); },80); } else if(documentScrollTop + eY > hOffset.top + hOffset.height) { this.barMouseDownInterval = setInterval(function(){ that.area.scrollTop += that.area.offsetHeight; if(that.area.scrollTop >= (eY + documentScrollTop - bOffset.top - that.arrowUpHeight - hOffset.height)/(that.bar.offsetHeight - that.arrowUpHeight - that.arrowDownHeight) * that.area.scrollHeight) { that.clearBarMouseDownInterval(); } that.setBarPos(); },80); } duma.stopEvent(e); }, arrowUpMouseDown:function(e) { var that = this; this.arrowUpInterval = setInterval(function(){ that.area.scrollTop -= 25; that.setBarPos(); },10); this.arrowUp.className = this.arrowUpActiveCss; duma.stopEvent(e); }, arrowUpMouseUp:function() { this.clearArrowUpInterval(); this.arrowUp.className = this.arrowUpCss; }, arrowUpMouseOut:function() { this.clearArrowUpInterval(); this.arrowUp.className = this.arrowUpCss; }, arrowDownMouseDown:function(e) { var that = this; this.arrowDownInterval = setInterval(function(){ that.area.scrollTop += 25; that.setBarPos(); },10); this.arrowDown.className = this.arrowDownActiveCss; duma.stopEvent(e); }, arrowDownMouseUp:function() { this.clearArrowDownInterval(); this.arrowDown.className = this.arrowDownCss; }, arrowDownMouseOut:function() { this.clearArrowDownInterval(); this.arrowDown.className = this.arrowDownCss; }, run:function(){ var that = this; this.sethandle(); this.areaScroll(); this.getBarPos(); this.area.onscroll = function(){that.areaScroll()}; this.area.onmouseover = this.bar.onmouseover = function(event){that.areakeydown(event)}; this.area.onmouseout = this.bar.onmouseout = function(){document.onkeydown = null}; this.handle.onmousedown = function(event){that.handleMouseDown(event)}; this.bar.onmousedown = function(event){that.barDown(event)}; this.bar.onmouseup = function(){that.clearBarMouseDownInterval()}; this.bar.onmouseout = function(){that.clearBarMouseDownInterval()}; this.arrowUp.onmousedown = function(event){that.arrowUpMouseDown(event)}; this.arrowUp.onmouseup = function(){that.arrowUpMouseUp()}; this.arrowUp.onmouseout = function(){that.arrowUpMouseOut()}; this.arrowDown.onmousedown = function(event){that.arrowDownMouseDown(event)}; this.arrowDown.onmouseup = function(){that.arrowDownMouseUp()}; this.arrowDown.onmouseout = function(){that.arrowDownMouseOut()}; duma.bind(this.obj,"mousewheel",function(event){that.barScroll(event)}); duma.bind(this.obj,"DOMMouseScroll",function(event){that.barScroll(event)}); } } duma.BeautifyScrollBar.init = function() { var o = document.getElementsByTagName("div"), oLen = o.length, dumascrollClass = /\bdumascroll\b/, oArr = [], oArrLen = oArr.length; for(var i=0; i<oLen; i++) { if(dumascrollClass.test(o[i].className)) { oArr.push("dumaScrollAreaId_" + i); oArrLen = oArr.length; o[i].id = oArr[oArrLen - 1]; } } for(var j=0; j<oArrLen; j++) { new duma.BeautifyScrollBar(oArr[j],"dumascroll_arrow_up","dumascroll_arrow_up_a","dumascroll_handle","dumascroll_handle_a","dumascroll_arrow_down","dumascroll_arrow_down_a").run(); } } duma.bind(window,"load",duma.BeautifyScrollBar.init); </script> </head> <body> <div class="a dumascroll b" style="width:300px; height:190px; padding:5px; border:1px solid #f00; line-height:400%; overflow:hidden;"> 我是第一个被渲染的，真不幸<br />我是第一个被渲染的，真不幸<br />我是第一个被渲染的，真不幸<br />我是第一个被渲染的，真不幸<br />我是第一个被渲染的，真不幸<br />我是第一个被渲染的，真不幸<br />我是第一个被渲染的，真不幸<br />我是第一个被渲染的，真不幸<br />我是第一个被渲染的，真不幸<br />我是第一个被渲染的，真不幸<br />我是第一个被渲染的，真不幸<br />我是第一个被渲染的，真不幸<br />我是第一个被渲染的，真不幸<br />我是第一个被渲染的，真不幸<br />我是第一个被渲染的，真不幸<br /> </div> <div class="a dumfaf" style="width:400px; height:100px; margin:20px; border:2px inset #eee; overflow:auto;"> 我还是普通的，我不希望被渲染，我就不用你的class，拿我怎么样？哈哈哈！<br /> 我还是普通的，我不希望被渲染，我就不用你的class，拿我怎么样？哈哈哈！<br />我还是普通的，我不希望被渲染，我就不用你的class，拿我怎么样？哈哈哈！<br />我还是普通的，我不希望被渲染，我就不用你的class，拿我怎么样？哈哈哈！<br />我还是普通的，我不希望被渲染，我就不用你的class，拿我怎么样？哈哈哈！<br />我还是普通的，我不希望被渲染，我就不用你的class，拿我怎么样？哈哈哈！<br />我还是普通的，我不希望被渲染，我就不用你的class，拿我怎么样？哈哈哈！<br />被渲染，我就不用你的class，拿我怎么样？哈哈哈！<br />我还是普通的，我不希望被渲染，我就不用你的class，拿我怎么样？哈哈哈！<br />我还是普通的，我不希望被渲染，我就不用你的class，拿我怎么样？哈哈哈！<br />我还是普通的，我不希望被渲染，我就不用你的class，拿我怎么样？哈哈哈！<br /> </div> <div class="a dumascroll" style="width:780px; height:350px; margin:20px; border:1px solid #369; background:#eee url(http://www.webjx.com/files/090716/1_161829.gif) no-repeat 50%; overflow:hidden;"> 22222<br /><div class="a dumascroll b" style=" width:200px; height:150px; margin:20px; border:1px solid #093; line-height:400%; background:#fff; overflow:hidden; float:left;"> 真倒霉啊，俺还是被嵌套渲染的，555555<br /> 真倒霉啊，俺还是被嵌套渲染的，555555<br /> 真倒霉啊，俺还是被嵌套渲染的，555555<br /> 真倒霉啊，俺还是被嵌套渲染的，555555<br /> 真倒霉啊，俺还是被嵌套渲染的，555555<br /> 真倒霉啊，俺还是被嵌套渲染的，555555<br /> 真倒霉啊，俺还是被嵌套渲染的，555555<br /> 真倒霉啊，俺还是被嵌套渲染的，555555<br /> 真倒霉啊，俺还是被嵌套渲染的，555555<br /> 真倒霉啊，俺还是被嵌套渲染的，555555<br /> 真倒霉啊，俺还是被嵌套渲染的，555555<br /> 真倒霉啊，俺还是被嵌套渲染的，555555<br /> 真倒霉啊，俺还是被嵌套渲染的，555555<br /> 真倒霉啊，俺还是被嵌套渲染的，555555<br /> 真倒霉啊，俺还是被嵌套渲染的，555555<br /> 真倒霉啊，俺还是被嵌套渲染的，555555<br /> 真倒霉啊，俺还是被嵌套渲染的，555555<br /> </div> <div class="a" style=" width:200px; height:120px; margin:20px; border:2px inset #eee; background:#fff; overflow:auto; float:right; float:right;"> 笨哟你，嵌套就嵌套，你不用他class就不会被渲染，你看看我，羡慕吧<br />笨哟你，嵌套就嵌套，你不用他class就不会被渲染，你看看我，羡慕吧<br />笨哟你，嵌套就嵌套，你不用他class就不会被渲染，你看看我，羡慕吧<br />笨哟你，嵌套就嵌套，你不用他class就不会被渲染，你看看我，羡慕吧<br />笨哟你，嵌套就嵌套，你不用他class就不会被渲染，你看看我，羡慕吧<br />笨哟你，嵌套就嵌套，你不用他class就不会被渲染，你看看我，羡慕吧<br />笨哟你，嵌套就嵌套，你不用他class就不会被渲染，你看看我，羡慕吧<br />笨哟你，嵌套就嵌套，你不用他class就不会被渲染，你看看我，羡慕吧<br />笨哟你，嵌套就嵌套，你不用他class就不会被渲染，你看看我，羡慕吧<br /> </div><br />11111111<br />fsdfs<br />11111111<br />fsdfs<br />11111111<br />fsdfs<br />11111111<br />fsdfs<br />11111111<br />fsdfs<br />11111111<br />fsdfs<br />11111111<br />fsdfs<br />11111111<br />fsdfs<br />11111111<br />fsdfs<br />11111111<br />fsdfs<br />11111111<br />fsdfs<br />fsdfs<br />11111111<br />fsdfs<br />11111111<br />fsdfs<br />11111111<br />fsdfs<br />11111111<br />fsdfs<br />11111111<br />fsdfs<br />11111111<br />fsdfs<br />11111111 </div> <h1>图片自定义滚动条3.0（Duma“自动渲染版”，也许世间万物都会变，但是真挚的爱，却永远留存在心中！）</h1> <ol> <li>支持任意形式（包括图片自定义）的美化扩展，跨浏览器支持</li> <li>支持鼠标按住上、下箭按钮实现上下滚动</li> <li>支持鼠标滚轮放于“滚动条区”滚动，而不仅限放于滚动内容区才滚</li> <li>支持鼠标按住滚动条（未松开）并移出滚动区域仍然能拖拽滚动</li> <li>滚动条子根据左边滚动内容高与可视区域高度比例等比例，且当滚动条细到一定程度时设置最小高度值,内容过少时隐藏滚动条子</li> <li>支持鼠标在滚动条子的上下空白区间点击实现上、下定位滚动（模拟windows滚动条）</li> <li>支持键盘上下方向键，滚动区滚完之后才轮到页面body滚</li> <li>支持页面刷新后保留滚动条滚动位置（需浏览器支持或打开cookie）</li> <li>鼠标放于自定义滚动区滚动滚轮，滚动区滚完之后才轮到页面body滚</li> <li>在原来几个版本基础上代码重构，这回只需在渲染的div里追加一个名为"dumascroll" 的class即可自动渲染，而不设此class的不受影响</li> <li>修复了以往版本所发现的bug</li> </ol> <h2>将来版本可继续扩展的功能有：</h2> <ul> <li>增加空格键的“下方向”快速滚动支持（更好地模拟windows滚动条用户体验）</li> <li>增加页面body的渲染支持</li> <li>增加textarea的渲染支持</li> <li>增加嵌套div的渲染支持（目前代码嵌套时有滚动的bug，被嵌套的div的滚动高度算法到这个版本时将大幅修改）</li> <li>增加同时出现横向滚动条的支持（当有这方面需求时可以扩展）</li> </ul> <p>期待大家帮忙寻找新bug并提出宝贵建议，相信下一版本将做的更好，谢谢。</p> </body> </html>
[Ctrl+A 全部选择提示：你可先修改部分代码，再按运行]

图片自定义滚动条3.0（Duma“自动渲染版”，也许世间万物都会变，但是真挚的爱，却永远留存在心中！）

支持任意形式（包括图片自定义）的美化扩展，跨浏览器支持
支持鼠标按住上、下箭按钮实现上下滚动
支持鼠标滚轮放于“滚动条区”滚动，而不仅限放于滚动内容区才滚
支持鼠标按住滚动条（未松开）并移出滚动区域仍然能拖拽滚动
滚动条子根据左边滚动内容高与可视区域高度比例等比例，且当滚动条细到一定程度时设置最小高度值,内容过少时隐藏滚动条子
支持鼠标在滚动条子的上下空白区间点击实现上、下定位滚动（模拟windows滚动条）
支持键盘上下方向键，滚动区滚完之后才轮到页面body滚
支持页面刷新后保留滚动条滚动位置（需浏览器支持或打开cookie）
鼠标放于自定义滚动区滚动滚轮，滚动区滚完之后才轮到页面body滚
在原来几个版本基础上代码重构，这回只需在渲染的div里追加一个名为"dumascroll" 的class即可自动渲染，而不设此class的不受影响
修复了以往版本所发现的bug：以往版本

将来版本可继续扩展的功能有：

增加空格键的“下方向”快速滚动支持（更好地模拟windows滚动条用户体验）
增加页面body的渲染支持
增加textarea的渲染支持
增加嵌套div的渲染支持（目前代码嵌套时有滚动的bug，被嵌套的div的滚动高度算法到这个版本时将大幅修改）
增加同时出现横向滚动条的支持（当有这方面需求时可以扩展）

期待大家帮忙寻找新bug并提出宝贵建议

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