自定义滚动条

默认的html滚动条很难看，一些漂亮的网站，滚动条都是针对网站整体样式配套设计的。

在网上搜索到两种改造方式。一种是给默认滚动条设置样式，另一种是使用设计好的图片+css+js。

都挺好用的。

第一种（纯css）：完成后

.div{ 
scrollbar-face-color: #ebebeb;
scrollbar-shadow-color: #ffffff; 
scrollbar-highlight-color:#ffffff; 
scrollbar-3dlight-color: #d8d8d8;  
scrollbar-darkshadow-color: #d8d8d8; 
scrollbar-track-color:#ffffff; 
scrollbar-arrow-color: #686868;
}

说明：

scrollbar-face-color 滚动条凸出部分的颜色
scrollbar-shadow-color 立体滚动条阴影的颜色
scrollbar-highlight-color 滚动条空白部分的颜色
scrollbar-3dlight-color 滚动条亮边的颜色
scrollbar-darkshadow-color 滚动条强阴影的颜色
scrollbar-track-color 滚动条的背景颜色
scrollbar-arrow-color 上下按钮上三角箭头的颜色
scrollbar-base-color 滚动条的基本颜色

第二种（css+图片+js，这是网上找的。谢谢原作者）：我自己页面使用的效果。

本例的css，图片，js直接拷贝就能用，js支持键盘上下方向键。

滚动条使用的图片如下（可以自行修改）：

下图一共是7个小图，从左到右分别是：

默认上箭头，按下时的上箭头，按下时的滚动块，背景，默认滚动块，默认下箭头，按下时的下箭头。

我这张图片做的简单。没有背景色，默认和按下的样子是一样的。不喜欢的同学可以自己改改~~

滚动条的css如下：

View Code

.dumascroll {}        /*只需对需要渲染滚动条的div设置该class即可,div要固定高度，超出部分设置隐藏，显示纵向滚动条。*/
.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(../images/un_bg_bar.gif);}
.dumascroll_bar {    position:absolute;    top:0;    right:0;    z-index:9;    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 {    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 { 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; }

js如下：

View Code

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);

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