Slim-scroll (JavaScript Scroll Library) ~ 4KB compressed

Slim scroll is a replacement of default scrollbar provided by browsers on Windows. This library lets you design the scroll-bar by using simple css properties. It is created using javascript and css.

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Tested on: IE9+, Chrome and Firefox.

Main Features:

• Easier to color the custom scrollbar using CSS.
• Can animate easily (check below properties for support).
• Re-evaluates when the container is fluid, vertically.

How to use:

• To make it work, include slimscroll.js in head tag.
• Apply height to the container in fixed units or percentage.
• Just design the scrollbar as you want by applying css classes as explained below.
• [In IE8] Apply high specificity to override normal styles given to the scroll bar.

and then:

Method 1 (with no added styles):

new slimScroll(Element);   // 'Element' is Javascript DOM object

Method 2 (with added styles):

or to add your own defined css styles:

new slimScroll(Element, {
  'wrapperClass': '',

  'scrollBarClass': '',

  'scrollBarContainerClass': '',  

  'scrollBarContainerSpecialClass': '',

  'scrollBarMinHeight': '',

  'scrollBarFixedHeight': '',

  'keepFocus': true/false
});

Explanation of above properties:

• wrapperClass (type - "string") : Mention wrapper class here.
• scrollBarClass (type - "string") : Mention scroll bar class here.
• scrollBarContainerClass (type - "string") : Mention scroll bar container class here.
• scrollBarContainerSpecialClass (type - "string") : This property is used to mention a class which will be applied only when the user is scrolling the content. Could be helpful while applying animations to the scroll bar.
• scrollBarMinHeight (type - "Integer") : Used to mention minimum scroll bar height here (without pixel unit)
• scrollBarFixedHeight (type - "Integer") : Used to mention scroll bar fixed height (without pixel unit). This makes sure to show the scroll bar height fixed even when content inside the container is increased.
• keepFocus (type - "Boolean") : Used to focus the container.

To make this work on height resize:

var customScroll = new slimScroll();
window.onresize = customScroll.resetValues;  // pure javascript example.

Note:

• Usage of the above mentioned properties is optional or as per need.
• Add higher specificity css to override the custom styles which are being applied by this library.
• Don't override the styles which are given highest specificity (!important) by this library (those styles are necessary to make this scroll library work).

How I got this thought:

I got this thought, when I found solution to hide the default scrollbar (using css) which was the requirement for a post on Stackoverflow.

The solution was simple but that is how I got this thought :).

Future implementations:

• Implement Horizontal Scrollbar.

If you find any issue(s), please file here.