#SimpleBar 2

SimpleBar is a plugin that tries to solve a long time problem : how to get custom scrollbars for your web-app? SimpleBar does NOT implement a custom scroll behaviour. It keeps the native overflow: auto scroll and only replace the scrollbar visual appearance.

SimpleBar 2 is here! See the changes:

• Feature: No need to manually instantiate SimpleBar with new or to call recalculate() anymore. Thanks to mutation observers, this is handled "automatically". Just add data-simplebar to any scrollable element you want and it will be SimpleBar-ified.
• Feature: No need to know what scroll direction you want, horizontal and vertical scrolls are now supported simultaneously.
• Feature: Dependency free. Fully rewritten with ES6 (transpiled to ES6 using Babel).

###Installation

- Via npm npm install simplebar --save

- Via <script> tag

<link rel="stylesheet" href="https://unpkg.com/simplebar@2.1.0/dist/simplebar.css" />
<script src="https://unpkg.com/simplebar@2.1.0/dist/simplebar.js"></script>

###Usage

Set data-simplebar on the element you want your custom scrollbar. You're done.

<div data-simplebar></div>

###Warning! SimpleBar is not intended to be used on the body element! I don't recommend wrapping your entire web page inside a custom scroll as it will often affect badly the user experience (slower scroll performances compare to natural body scroll, no usual scroll behaviours like arrow keys, etc.). Do it at your own risk! SimpleBar is mean to improve the experience of internal web pages scrolls: like a chat box or a small scrolling area.

1. Documentation
2. Browsers support
3. Demo
4. How it works
5. Changelog
6. Credits

##1. Documentation

Other usages

You can start SimpleBar mannually if you need to:

new SimpleBar(document.getElementById('#myElement'))

If you want to use jQuery:

new SimpleBar($('#myElement')[0])

###Options

Options can be applied to the plugin during initialization:

new SimpleBar(document.getElementById('#myElement'), {
    option1: value1,
    option2: value2
})

Available options are:

####forceEnabled

By default SimpleBar is not enabled on floating scrollbars environments like on mobile or on mac OS. To force SimpleBar to be enabled, use this option.

Default value is false

####wrapContent

By default SimpleBar requires minimal markup. When initialized it will wrap a simplebar-contentelement in a div with the class simplebar-scroll-content. If you prefer to include this wrapper element directly in your markup you can switch the default behaviour off by setting the wrapContent option to false:

new SimpleBar(document.getElementById('#myElement'), { wrapContent: false });

Default value is true

####autoHide

By default SimpleBar automatically hides the scrollbar if the user is not scrolling (it emulates Mac OSX Lion's scrollbar). You can make the scrollbar always visible by setting the autoHide option to false:

new SimpleBar(document.getElementById('#myElement'), { autoHide: false });

Default value is true

You can also control the animation via CSS as it's a simple CSS opacity transition.

####scrollbarMinSize Define the minimum scrollbar size in pixels.

Default value is 10

####css

It is possible to specify css classes to change the design of the scrollbar. To get your own styles to work refer to simplebar.css to get an idea how to setup your css.

• container represents the wrapper for the area scrolled by simplebar.
• content represents the wrapper for the content being scrolled.
• scrollContent represents the container containing elements being scrolled.
• scrollbar defines the style of the scrollbar with which the user can interact to scroll the content.
• scrollbarTrack styles the area surrounding the scrollbar.

css: {
  // defaults
  container: 'simplebar',
  content: 'simplebar-content',
  scrollContent: 'simplebar-scroll-content',
  scrollbar: 'simplebar-scrollbar',
  scrollbarTrack: 'simplebar-track'
}

###Notifying the plugin of content changes ####Note: you shouldn't need to use these functions as SimpleBar is taking care of that automatically. This is for advanced usage only.

If you later dynamically modify your content, for instance changing its height or width, or adding or removing content, you should recalculate the scrollbars like so:

var el = new SimpleBar(document.getElementById('#myElement'));
el.SimpleBar.recalculate()

###Trigger programmatical scrolling If you want to access to original scroll element, you can retrieve it via a getter :

var el = new SimpleBar(document.getElementById('#myElement'));
el.SimpleBar.getScrollElement()

###Subscribe to scroll event You can subscribe to the scroll event just like you do with native scrolling element :

var el = new SimpleBar(document.getElementById('#myElement'));
el.SimpleBar.getScrollElement().addEventListener('scroll', function(...));

###Add content dynamically (ajax) You can retrieve the element containing datas like this :

var el = new SimpleBar(document.getElementById('#myElement'));
el.SimpleBar.getContentElement();

This is best to use this rather than querying it via the DOM directly cause it avoids problem when the plugin is disabled (like on mobiles).

###Disable Mutation Observer SimpleBar.removeObserver();

###Non-JS fallback

SimpleBar hides the browser's default scrollbars, which obviously is undesirable if the user has JavaScript disabled. To restore the browser's scrollbars you can include the following noscript element in your document's head:

<noscript>
  <style>
    [data-simplebar] {
      overflow: auto;
    }
  </style>
</noscript>

##2. Browsers support

Simplebar has been tested on the following browsers: Chrome, Firefox, Safari, Edge, IE11.

Notice: IE10 doesn't support MutationObserver so you will still need to instantiate SimpleBar manually and call recalculate() as needed (or you can just use a polyfill for MutationObserver).

If you want to support IE9 you will need polyfills for:

• classList

Or you can use SimpleBar v1.

###Mobile support Most of the mobile browsers have "floating" scrollbars. Also, they are not all currently supporting hardware acceleration on overflow: auto elements. So we decided to automatically disable SimpleBar when a "floating" scrollbar is detected. So mobile browsers will use native scrollbar seemlessly. For example you will notice that it will use native scrollbar on mac OSX 10.8+ (when using trackpad) as the scrollbar is natively floating.

##3. Demo http://grsmto.github.io/simplebar/

##4. How it works

SimpleBar does only one thing : replace the browser's default scrollbars with a custom CSS-styled scrollbar without losing performance. Unlike most of others plugins, SimpleBar doesn't mimic scroll with Javascript, causing janks and strange scrolling behaviours...You keep the awesomeness of native scrolling...with a custom scrollbar! Design your scrollbar like you want, with CSS, on all browsers.

For the most part SimpleBar uses the browser's native scrolling functionality, but replaces the conventional scrollbar with a custom CSS-styled scrollbar. The plugin listens for scroll events and redraws the custom scrollbar accordingly.

Key to this technique is hiding the native browser scrollbar. The scrollable element is made slightly wider/taller than its containing element, effectively hiding the scrollbar from view.

##5. Changelog

See changelog here : https://github.com/Grsmto/simplebar/releases

##6. Credits

Most of the credit goes to Jonathan Nicol who made the original plugin called Trackpad Scroll Emulator.

Website: http://html5up.net/

###Additional contributors

Yoh Suzuki: wrapContent option