Personalizar la barra de desplazamiento (scrollbar) con jScrollPane

jScrollPane es un script de jQuery que permite cambiar la barra de desplazamiento del blog, es decir, el scrollbar del navegador.
Si bien podemos usar CSS para modificarlo, el problema es que no est? estandarizado, por lo que con CSS s?lo podemos hacerlo funcionar en Chrome y Safari; y en el caso de Internet Explorer tambi�n tiene su propio c?digo pero obviamente s?lo funciona en ese navegador (no s� en cu?les versiones). As? que lo que haremos a continuaci?n es darle un nuevo aspecto al scrollbar pero usando jQuery, de esta manera el cambio ser? visible en todos los navegadores.

Puedes ver un ejemplo en este blog de pruebas, ver?s que la barra de desplazamiento tiene otra forma y color.

Para cambiar el scrollbar de tu blog primero entra en Plantilla | Edici?n de HTML y antes de </head> pega este c?digo:

<script src='//ajax.googleapis.com/ajax/libs/jquery/1.8.2/jquery.min.js' type='text/javascript'/>

<style>
.jspContainer {overflow: hidden;position: relative;}.jspPane {position: absolute;}
.jspVerticalBar {position: absolute;top: 0;right: 0;width: 16px;height: 100%;background: #ccc;}
.jspHorizontalBar {position: absolute;bottom: 0;left: 0;width: 100%;height: 16px;background: #ccc;}
.jspVerticalBar *,.jspHorizontalBar * {margin: 0;padding: 0;}
.jspCap {display: none;}.jspHorizontalBar .jspCap {float: left;}

.jspTrack {
background: #dde; /* Color de fondo de la barra */
position: relative;
}
.jspDrag {
background: #bbd; /* Color del botón de desplazamiento */
position: relative;
top: 0;
left: 0;
cursor: pointer;
}
.jspHorizontalBar .jspTrack,
.jspHorizontalBar .jspDrag {
float: left;
height: 100%;
}
.jspArrow {
background: #50506d; /*Color de los límites */
text-indent: -20000px;
display: block;
cursor: pointer;
}
.jspArrow.jspDisabled {
cursor: default;
background: #80808d; /*Color de los límites cuando el botón llega hasta ellos */
}
.jspVerticalBar .jspArrow {
height: 16px;
}
.jspHorizontalBar .jspArrow {
width: 16px;
float: left;
height: 100%;
}
.jspVerticalBar .jspArrow:focus {outline: none;}.jspCorner {background: #eeeef4;float: left;height: 100%;}* html .jspCorner {margin: 0 -3px 0 0;}
html, body {
height: 100%;
margin: 0;
padding: 0;
}
#blog-container {
height: 100%;
margin: 0;
padding: 0;
overflow: auto;
}
</style>
<script>
//<![CDATA[
/*! Copyright (c) 2013 Brandon Aaron (http://brandonaaron.net)
* Licensed under the MIT License (LICENSE.txt).
* Version: 3.1.3
*/

(function (factory) {
if ( typeof define === 'function' && define.amd ) {
define(['jquery'], factory);
} else if (typeof exports === 'object') {
module.exports = factory;
} else {
// Browser globals
factory(jQuery);
}
}(function ($) {

var toFix = ['wheel', 'mousewheel', 'DOMMouseScroll', 'MozMousePixelScroll'];
var toBind = 'onwheel' in document || document.documentMode >= 9 ? ['wheel'] : ['mousewheel', 'DomMouseScroll', 'MozMousePixelScroll'];
var lowestDelta, lowestDeltaXY;

if ( $.event.fixHooks ) {
for ( var i = toFix.length; i; ) {
$.event.fixHooks[ toFix[--i] ] = $.event.mouseHooks;
}
}

$.event.special.mousewheel = {
setup: function() {
if ( this.addEventListener ) {
for ( var i = toBind.length; i; ) {
this.addEventListener( toBind[--i], handler, false );
}
} else {
this.onmousewheel = handler;
}
},

teardown: function() {
if ( this.removeEventListener ) {
for ( var i = toBind.length; i; ) {
this.removeEventListener( toBind[--i], handler, false );
}
} else {
this.onmousewheel = null;
}
}
};

$.fn.extend({
mousewheel: function(fn) {
return fn ? this.bind("mousewheel", fn) : this.trigger("mousewheel");
},

unmousewheel: function(fn) {
return this.unbind("mousewheel", fn);
}
});

function handler(event) {
var orgEvent = event || window.event,
args = [].slice.call(arguments, 1),
delta = 0,
deltaX = 0,
deltaY = 0,
absDelta = 0,
absDeltaXY = 0,
fn;
event = $.event.fix(orgEvent);
event.type = "mousewheel";
if ( orgEvent.wheelDelta ) { delta = orgEvent.wheelDelta; }
if ( orgEvent.detail ) { delta = orgEvent.detail * -1; }
if ( orgEvent.deltaY ) {
deltaY = orgEvent.deltaY * -1;
delta = deltaY;
}
if ( orgEvent.deltaX ) {
deltaX = orgEvent.deltaX;
delta = deltaX * -1;
}
if ( orgEvent.wheelDeltaY !== undefined ) { deltaY = orgEvent.wheelDeltaY; }
if ( orgEvent.wheelDeltaX !== undefined ) { deltaX = orgEvent.wheelDeltaX * -1; }
absDelta = Math.abs(delta);
if ( !lowestDelta || absDelta < lowestDelta ) { lowestDelta = absDelta; }
absDeltaXY = Math.max(Math.abs(deltaY), Math.abs(deltaX));
if ( !lowestDeltaXY || absDeltaXY < lowestDeltaXY ) { lowestDeltaXY = absDeltaXY; }
fn = delta > 0 ? 'floor' : 'ceil';
delta = Math[fn](delta / lowestDelta);
deltaX = Math[fn](deltaX / lowestDeltaXY);
deltaY = Math[fn](deltaY / lowestDeltaXY);
args.unshift(event, delta, deltaX, deltaY);
return ($.event.dispatch || $.event.handle).apply(this, args);
}
}));

/*
* jScrollPane - v2.0.0beta5 - 2010-09-18
* http://jscrollpane.kelvinluck.com/
* Copyright (c) 2010 Kelvin Luck
* Dual licensed under the MIT and GPL licenses.
*/
(function(b,a,c){b.fn.jScrollPane=function(f){function d(C,L){var au,N=this,V,ah,v,aj,Q,W,y,q,av,aB,ap,i,H,h,j,X,R,al,U,t,A,am,ac,ak,F,l,ao,at,x,aq,aE,g,aA,ag=true,M=true,aD=false,k=false,Z=b.fn.mwheelIntent?"mwheelIntent.jsp":"mousewheel.jsp";aE=C.css("paddingTop")+" "+C.css("paddingRight")+" "+C.css("paddingBottom")+" "+C.css("paddingLeft");g=(parseInt(C.css("paddingLeft"))||0)+(parseInt(C.css("paddingRight"))||0);an(L);function an(aH){var aL,aK,aJ,aG,aF,aI;au=aH;if(V==c){C.css({overflow:"hidden",padding:0});ah=C.innerWidth()+g;v=C.innerHeight();C.width(ah);V=b('<div class="jspPane" />').wrap(b('<div class="jspContainer" />').css({width:ah+"px",height:v+"px"}));C.wrapInner(V.parent());aj=C.find(">.jspContainer");V=aj.find(">.jspPane");V.css("padding",aE)}else{C.css("width",null);aI=C.outerWidth()+g!=ah||C.outerHeight()!=v;if(aI){ah=C.innerWidth()+g;v=C.innerHeight();aj.css({width:ah+"px",height:v+"px"})}aA=V.innerWidth();if(!aI&&V.outerWidth()==Q&&V.outerHeight()==W){if(aB||av){V.css("width",aA+"px");C.css("width",(aA+g)+"px")}return}V.css("width",null);C.css("width",(ah)+"px");aj.find(">.jspVerticalBar,>.jspHorizontalBar").remove().end()}aL=V.clone().css("position","absolute");aK=b('<div style="width:1px; position: relative;" />').append(aL);b("body").append(aK);Q=Math.max(V.outerWidth(),aL.outerWidth());aK.remove();W=V.outerHeight();y=Q/ah;q=W/v;av=q>1;aB=y>1;if(!(aB||av)){C.removeClass("jspScrollable");V.css({top:0,width:aj.width()-g});n();D();O();w();af()}else{C.addClass("jspScrollable");aJ=au.maintainPosition&&(H||X);if(aJ){aG=ay();aF=aw()}aC();z();E();if(aJ){K(aG);J(aF)}I();ad();if(au.enableKeyboardNavigation){P()}if(au.clickOnTrack){p()}B();if(au.hijackInternalLinks){m()}}if(au.autoReinitialise&&!aq){aq=setInterval(function(){an(au)},au.autoReinitialiseDelay)}else{if(!au.autoReinitialise&&aq){clearInterval(aq)}}C.trigger("jsp-initialised",[aB||av])}function aC(){if(av){aj.append(b('<div class="jspVerticalBar" />').append(b('<div class="jspCap jspCapTop" />'),b('<div class="jspTrack" />').append(b('<div class="jspDrag" />').append(b('<div class="jspDragTop" />'),b('<div class="jspDragBottom" />'))),b('<div class="jspCap jspCapBottom" />')));R=aj.find(">.jspVerticalBar");al=R.find(">.jspTrack");ap=al.find(">.jspDrag");if(au.showArrows){am=b('<a class="jspArrow jspArrowUp" />').bind("mousedown.jsp",az(0,-1)).bind("click.jsp",ax);ac=b('<a class="jspArrow jspArrowDown" />').bind("mousedown.jsp",az(0,1)).bind("click.jsp",ax);if(au.arrowScrollOnHover){am.bind("mouseover.jsp",az(0,-1,am));ac.bind("mouseover.jsp",az(0,1,ac))}ai(al,au.verticalArrowPositions,am,ac)}t=v;aj.find(">.jspVerticalBar>.jspCap:visible,>.jspVerticalBar>.jspArrow").each(function(){t-=b(this).outerHeight()});ap.hover(function(){ap.addClass("jspHover")},function(){ap.removeClass("jspHover")}).bind("mousedown.jsp",function(aF){b("html").bind("dragstart.jsp selectstart.jsp",function(){return false});ap.addClass("jspActive");var s=aF.pageY-ap.position().top;b("html").bind("mousemove.jsp",function(aG){S(aG.pageY-s,false)}).bind("mouseup.jsp mouseleave.jsp",ar);return false});o()}}function o(){al.height(t+"px");H=0;U=au.verticalGutter+al.outerWidth();V.width(ah-U-g);if(R.position().left==0){V.css("margin-left",U+"px")}}function z(){if(aB){aj.append(b('<div class="jspHorizontalBar" />').append(b('<div class="jspCap jspCapLeft" />'),b('<div class="jspTrack" />').append(b('<div class="jspDrag" />').append(b('<div class="jspDragLeft" />'),b('<div class="jspDragRight" />'))),b('<div class="jspCap jspCapRight" />')));ak=aj.find(">.jspHorizontalBar");F=ak.find(">.jspTrack");h=F.find(">.jspDrag");if(au.showArrows){at=b('<a class="jspArrow jspArrowLeft" />').bind("mousedown.jsp",az(-1,0)).bind("click.jsp",ax);x=b('<a class="jspArrow jspArrowRight" />').bind("mousedown.jsp",az(1,0)).bind("click.jsp",ax);
if(au.arrowScrollOnHover){at.bind("mouseover.jsp",az(-1,0,at));x.bind("mouseover.jsp",az(1,0,x))}ai(F,au.horizontalArrowPositions,at,x)}h.hover(function(){h.addClass("jspHover")},function(){h.removeClass("jspHover")}).bind("mousedown.jsp",function(aF){b("html").bind("dragstart.jsp selectstart.jsp",function(){return false});h.addClass("jspActive");var s=aF.pageX-h.position().left;b("html").bind("mousemove.jsp",function(aG){T(aG.pageX-s,false)}).bind("mouseup.jsp mouseleave.jsp",ar);return false});l=aj.innerWidth();ae()}else{}}function ae(){aj.find(">.jspHorizontalBar>.jspCap:visible,>.jspHorizontalBar>.jspArrow").each(function(){l-=b(this).outerWidth()});F.width(l+"px");X=0}function E(){if(aB&&av){var aF=F.outerHeight(),s=al.outerWidth();t-=aF;b(ak).find(">.jspCap:visible,>.jspArrow").each(function(){l+=b(this).outerWidth()});l-=s;v-=s;ah-=aF;F.parent().append(b('<div class="jspCorner" />').css("width",aF+"px"));o();ae()}if(aB){V.width((aj.outerWidth()-g)+"px")}W=V.outerHeight();q=W/v;if(aB){ao=1/y*l;if(ao>au.horizontalDragMaxWidth){ao=au.horizontalDragMaxWidth}else{if(ao<au.horizontalDragMinWidth){ao=au.horizontalDragMinWidth}}h.width(ao+"px");j=l-ao;ab(X)}if(av){A=1/q*t;if(A>au.verticalDragMaxHeight){A=au.verticalDragMaxHeight}else{if(A<au.verticalDragMinHeight){A=au.verticalDragMinHeight}}ap.height(A+"px");i=t-A;aa(H)}}function ai(aG,aI,aF,s){var aK="before",aH="after",aJ;if(aI=="os"){aI=/Mac/.test(navigator.platform)?"after":"split"}if(aI==aK){aH=aI}else{if(aI==aH){aK=aI;aJ=aF;aF=s;s=aJ}}aG[aK](aF)[aH](s)}function az(aF,s,aG){return function(){G(aF,s,this,aG);this.blur();return false}}function G(aH,aF,aK,aJ){aK=b(aK).addClass("jspActive");var aI,s=function(){if(aH!=0){T(X+aH*au.arrowButtonSpeed,false)}if(aF!=0){S(H+aF*au.arrowButtonSpeed,false)}},aG=setInterval(s,au.arrowRepeatFreq);s();aI=aJ==c?"mouseup.jsp":"mouseout.jsp";aJ=aJ||b("html");aJ.bind(aI,function(){aK.removeClass("jspActive");clearInterval(aG);aJ.unbind(aI)})}function p(){w();if(av){al.bind("mousedown.jsp",function(aH){if(aH.originalTarget==c||aH.originalTarget==aH.currentTarget){var aG=b(this),s=setInterval(function(){var aI=aG.offset(),aJ=aH.pageY-aI.top;if(H+A<aJ){S(H+au.trackClickSpeed)}else{if(aJ<H){S(H-au.trackClickSpeed)}else{aF()}}},au.trackClickRepeatFreq),aF=function(){s&&clearInterval(s);s=null;b(document).unbind("mouseup.jsp",aF)};b(document).bind("mouseup.jsp",aF);return false}})}if(aB){F.bind("mousedown.jsp",function(aH){if(aH.originalTarget==c||aH.originalTarget==aH.currentTarget){var aG=b(this),s=setInterval(function(){var aI=aG.offset(),aJ=aH.pageX-aI.left;if(X+ao<aJ){T(X+au.trackClickSpeed)}else{if(aJ<X){T(X-au.trackClickSpeed)}else{aF()}}},au.trackClickRepeatFreq),aF=function(){s&&clearInterval(s);s=null;b(document).unbind("mouseup.jsp",aF)};b(document).bind("mouseup.jsp",aF);return false}})}}function w(){F&&F.unbind("mousedown.jsp");al&&al.unbind("mousedown.jsp")}function ar(){b("html").unbind("dragstart.jsp selectstart.jsp mousemove.jsp mouseup.jsp mouseleave.jsp");ap&&ap.removeClass("jspActive");h&&h.removeClass("jspActive")}function S(s,aF){if(!av){return}if(s<0){s=0}else{if(s>i){s=i}}if(aF==c){aF=au.animateScroll}if(aF){N.animate(ap,"top",s,aa)}else{ap.css("top",s);aa(s)}}function aa(aF){if(aF==c){aF=ap.position().top}aj.scrollTop(0);H=aF;var aI=H==0,aG=H==i,aH=aF/i,s=-aH*(W-v);if(ag!=aI||aD!=aG){ag=aI;aD=aG;C.trigger("jsp-arrow-change",[ag,aD,M,k])}u(aI,aG);V.css("top",s);C.trigger("jsp-scroll-y",[-s,aI,aG])}function T(aF,s){if(!aB){return}if(aF<0){aF=0}else{if(aF>j){aF=j}}if(s==c){s=au.animateScroll}if(s){N.animate(h,"left",aF,ab)}else{h.css("left",aF);ab(aF)}}function ab(aF){if(aF==c){aF=h.position().left}aj.scrollTop(0);X=aF;var aI=X==0,aH=X==j,aG=aF/j,s=-aG*(Q-ah);if(M!=aI||k!=aH){M=aI;k=aH;C.trigger("jsp-arrow-change",[ag,aD,M,k])}r(aI,aH);V.css("left",s);C.trigger("jsp-scroll-x",[-s,aI,aH])}function u(aF,s){if(au.showArrows){am[aF?"addClass":"removeClass"]("jspDisabled");ac[s?"addClass":"removeClass"]("jspDisabled")}}function r(aF,s){if(au.showArrows){at[aF?"addClass":"removeClass"]("jspDisabled");
x[s?"addClass":"removeClass"]("jspDisabled")}}function J(s,aF){var aG=s/(W-v);S(aG*i,aF)}function K(aF,s){var aG=aF/(Q-ah);T(aG*j,s)}function Y(aN,aL,aF){var aJ,aH,s=0,aG,aK,aM;try{aJ=b(aN)}catch(aI){return}aH=aJ.outerHeight();aj.scrollTop(0);while(!aJ.is(".jspPane")){s+=aJ.position().top;aJ=aJ.offsetParent();if(/^body|html$/i.test(aJ[0].nodeName)){return}}aG=aw();aK=aG+v;if(s<aG||aL){aM=s-au.verticalGutter}else{if(s+aH>aK){aM=s-v+aH+au.verticalGutter}}if(aM){J(aM,aF)}}function ay(){return -V.position().left}function aw(){return -V.position().top}function ad(){aj.unbind(Z).bind(Z,function(aI,aJ,aH,aF){var aG=X,s=H;T(X+aH*au.mouseWheelSpeed,false);S(H-aF*au.mouseWheelSpeed,false);return aG==X&&s==H})}function n(){aj.unbind(Z)}function ax(){return false}function I(){V.unbind("focusin.jsp").bind("focusin.jsp",function(s){if(s.target===V[0]){return}Y(s.target,false)})}function D(){V.unbind("focusin.jsp")}function P(){var aF,s;C.attr("tabindex",0).unbind("keydown.jsp").bind("keydown.jsp",function(aJ){if(aJ.target!==C[0]){return}var aH=X,aG=H,aI=aF?2:16;switch(aJ.keyCode){case 40:S(H+aI,false);break;case 38:S(H-aI,false);break;case 34:case 32:J(aw()+Math.max(32,v)-16);break;case 33:J(aw()-v+16);break;case 35:J(W-v);break;case 36:J(0);break;case 39:T(X+aI,false);break;case 37:T(X-aI,false);break}if(!(aH==X&&aG==H)){aF=true;clearTimeout(s);s=setTimeout(function(){aF=false},260);return false}});if(au.hideFocus){C.css("outline","none");if("hideFocus" in aj[0]){C.attr("hideFocus",true)}}else{C.css("outline","");if("hideFocus" in aj[0]){C.attr("hideFocus",false)}}}function O(){C.attr("tabindex","-1").removeAttr("tabindex").unbind("keydown.jsp")}function B(){if(location.hash&&location.hash.length>1){var aG,aF;try{aG=b(location.hash)}catch(s){return}if(aG.length&&V.find(aG)){if(aj.scrollTop()==0){aF=setInterval(function(){if(aj.scrollTop()>0){Y(location.hash,true);b(document).scrollTop(aj.position().top);clearInterval(aF)}},50)}else{Y(location.hash,true);b(document).scrollTop(aj.position().top)}}}}function af(){b("a.jspHijack").unbind("click.jsp-hijack").removeClass("jspHijack")}function m(){af();b("a[href^=#]").addClass("jspHijack").bind("click.jsp-hijack",function(){var s=this.href.split("#"),aF;if(s.length>1){aF=s[1];if(aF.length>0&&V.find("#"+aF).length>0){Y("#"+aF,true);return false}}})}b.extend(N,{reinitialise:function(aF){aF=b.extend({},aF,au);an(aF)},scrollToElement:function(aG,aF,s){Y(aG,aF,s)},scrollTo:function(aG,s,aF){K(aG,aF);J(s,aF)},scrollToX:function(aF,s){K(aF,s)},scrollToY:function(s,aF){J(s,aF)},scrollBy:function(aF,s,aG){N.scrollByX(aF,aG);N.scrollByY(s,aG)},scrollByX:function(s,aG){var aF=ay()+s,aH=aF/(Q-ah);T(aH*j,aG)},scrollByY:function(s,aG){var aF=aw()+s,aH=aF/(W-v);S(aH*i,aG)},animate:function(aF,aI,s,aH){var aG={};aG[aI]=s;aF.animate(aG,{duration:au.animateDuration,ease:au.animateEase,queue:false,step:aH})},getContentPositionX:function(){return ay()},getContentPositionY:function(){return aw()},getIsScrollableH:function(){return aB},getIsScrollableV:function(){return av},getContentPane:function(){return V},scrollToBottom:function(s){S(i,s)},hijackInternalLinks:function(){m()}})}f=b.extend({},b.fn.jScrollPane.defaults,f);var e;this.each(function(){var g=b(this),h=g.data("jsp");if(h){h.reinitialise(f)}else{h=new d(g,f);g.data("jsp",h)}e=e?e.add(g):g});return e};b.fn.jScrollPane.defaults={showArrows:false,maintainPosition:true,clickOnTrack:true,autoReinitialise:false,autoReinitialiseDelay:500,verticalDragMinHeight:0,verticalDragMaxHeight:99999,horizontalDragMinWidth:0,horizontalDragMaxWidth:99999,animateScroll:false,animateDuration:300,animateEase:"linear",hijackInternalLinks:false,verticalGutter:4,horizontalGutter:4,mouseWheelSpeed:10,arrowButtonSpeed:10,arrowRepeatFreq:100,arrowScrollOnHover:false,trackClickSpeed:30,trackClickRepeatFreq:100,verticalArrowPositions:"split",horizontalArrowPositions:"split",enableKeyboardNavigation:true,hideFocus:false}})(jQuery,this);
//]]>
</script>

<script>
$(document).ready(function() {
$('.scroll-pane').jScrollPane({showArrows: true});
});
</script>

Luego busca la etiqueta:

<body>

O esta l?nea:

<body expr:class='&quot;loading&quot; + data:blog.mobileClass'>

Debajo de cualquiera de ellas dos agrega esto:

<div class='scroll-pane' id='blog-container'>

Por ?ltimo busca la etiqueta </body> y arriba de ella pega esto:

</div>

Guarda los cambios y listo. En color verde ver?s d?nde se cambian los colores de la barra de desplazamiento y sus diferentes ?reas, como es CSS puedes a?adirle otros estilos si lo deseas, somo sombras, bordes redondeados, etc.
Si quisieras que no aparezcan los l?mites superior e inferior (como en el ejemplo) entonces elimina lo que est? en color rojo.

Recuerda que el script usa jQuery, as? que si ya lo tuvieras no pongas de nuevo el script (la primera l?nea del c?digo). Si usas Scriptaculous o Mootools deber?s hacerle unos ligeros cambios para que funcione.

Parece largo el c?digo pero siempre es mejor alojar los scripts directo en la plantilla que subirlo a un hosting, de estar forma los scripts siempre estar?n disponibles y cargar?n m?s r?pido. Independientemente de todo eso el resultado final es bastante est�tico, ?no lo creen?