HonLuk / smooth-scrollbar

Customize scrollbar in modern browsers with smooth scrolling experience.

Life is short, use smooth-scrollbar

• If you want smooth scrolling, use smooth-scrollbar;
• If you want customizable scrollbars, use smooth-scrollbar;
• If you want high-performance scrollbars, use smooth-scrollbar;
• If you want incredibly prompt user support, use smooth-scrollbar;
• If you want perfect scrollbar in modern browsers, use smooth-scrollbar!

So, why would you still use other scrollbar plugins? All you need is a quick setup:

Install

Via npm:

npm install smooth-scrollbar --save

Via bower:

bower install smooth-scrollbar --save

Browser Compatibility

Browser	Version
IE	10+
Chrome	22+
Firefox	16+
Safari	8+
Android Browser	4+
Chrome for Android	32+
iOS Safari	7+

Demo

http://idiotwu.github.io/smooth-scrollbar/

Why is native scrolling slow?

As is explained in this article, browser repaint every frame in scrolling. Less painting is better.

To avoid repainting, I use translate3d in scroll content to create composite layers and force hardware accelerating.

Usage

Smooth scrollbar is defined as an UMD module which named Scrollbar, you can use any loader to load it:

import Scrollbar from 'smooth-scrollbar';

Or get it from window object:

const { Scrollbar } = window;

Don't forget to include the stylesheet in your page:

<link rel="stylesheet" href="dist/smooth-scrollbar.css">

Here're three ways to tell the plugin which element should be a smooth scrollbar:

1. As an element:

   <scrollbar>
       ...
   </scrollbar>

2. As an attribute:

   <section scrollbar>
       ...
   </section>

3. As a data attribute

   <section data-scrollbar>
       ...
   </section>

Then init all scrollbars:

Scrollbar.initAll(options);

Or you can call Scrollbar.init(elem, options) to manually init the scrollbar.

Available Options for Scrollbar

parameter	type	default	description
speed	Number	1	Scrolling speed scale.
friction	Number	10	Scrolling friction, a percentage value within (1, 100).
thumbMinSize	Number	20	Minimal size for scrollbar thumb.
renderByPixels	Boolean	true	Render scrolling by integer pixels, set to true to improve performance.
continuousScrolling	Boolean|String	'auto'	Whether allow upper scrollable content to continue scrolling when current scrollbar reaches edge. When set to 'auto', it will be enabled on nested scrollbars, and disabled on first-class scrollbars.

Confusing with the option field? Try edit tool here!

DOM Structure

Following is the DOM structure that Scrollbar generated:

<scrollbar>
    <article class="scroll-content">
        your contents here...
    </article>
    <aside class="scrollbar-track scrollbar-track-x">
        <div class="scrollbar-thumb scrollbar-thumb-x"></div>
    </aside>
    <aside class="scrollbar-track scrollbar-track-y">
        <div class="scrollbar-thumb scrollbar-thumb-y"></div>
    </aside>
</scrollbar>

APIs

• Scrollbar API Documents
• Instance API Documents

Scrollbar

• Scrollbar.init( element, [options] )
• Scrollbar.initAll( [options] )
• Scrollbar.has( element )
• Scrollbar.get( element )
• Scrollbar.getAll()
• Scrollbar.destroy( element )
• Scrollbar.destroyAll()

Instance

Properties

• instance#targets
• instance#offset
• instance#limit
• instance#scrollTop
• instance#scrollLeft

Methods

• instance#update( [async] )
• instance#getSize()
• instance#setPosition( x, y, [withoutCallbacks] )
• instance#scrollTo( x, y, [duration], [callback] )
• instance#scrollIntoView( elem, [options] )
• instance#isVisible( elem )
• instance#addListener( fn )
• instance#removeListener( fn )
• instance#unregisterEvents( regex [, regex [,...regex] ] )
• instance#registerEvents( regex [, regex [,...regex] ] )
• instance#infiniteScroll( callback, [threshold] )
• instance#clearMovement()
• instance#stop()
• instance#destroy()
• instance#getContentElem()
• instance#showTrack( [direction] )
• instance#hideTrack( [direction] )

Related

• angular-smooth-scrollbar
• react-smooth-scrollbar

Todo

• Overscroll effect.

Contribuiting

• Create an issue with an example on jsbin.com, including latest version of smooth-scrollbar through:

  <link rel="stylesheet" href="https://cdn.rawgit.com/idiotWu/smooth-scrollbar/master/dist/smooth-scrollbar.css">
  
  <script src="https://cdn.rawgit.com/idiotWu/smooth-scrollbar/master/dist/smooth-scrollbar.js"></script>

• Fork the repo and modify the code if you have better ideas, create a pull request into develop branch after you've done.

License

MIT.