nanoScroller.js [![NPM version][npm-image]][npm-url]

nanoScroller.js is a jQuery plugin that offers a simple way of implementing Mac OS X Lion-styled scrollbars for your website.
It uses minimal HTML markup being .nano > .nano-content. The other scrollbar div elements .pane > .nano-slider are added during run time to prevent clutter in templating. The latest version utilizes native scrolling and works with the iPad, iPhone, and some Android Tablets.

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- Production version
- Development version
- Default stylesheet

To start using, you need three basic things:

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The following type of markup structure is needed to make the plugin work:

``html



`

Copy the HTML markup. Change .nano into something related to your content. Though you can also remove that attribute as long as you have a parent div with an ID reference. e.g. #parent > .nano. nano and nano-content classnames can be customized via plugin options (_in that case you must rename them inside the plugin's CSS file as well_).

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Link to the nanoscroller.css file inside your page's section (...or copy the contents from it to your page's main stylesheet file).

`html

`

You should specify a width and a height to your container, and apply some custom styling for your scrollbar. Here's an example:

`css
.nano { background: #bba; width: 500px; height: 500px; }
.nano > .nano-content { padding: 10px; }
.nano > .nano-pane { background: #888; }
.nano > .nano-pane > .nano-slider { background: #111; }
`

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Running this script will apply the nanoScroller plugin to all DOM elements with a .nano className.

`js
$(".nano").nanoScroller();
`

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To scroll at the top:

`js
$(".nano").nanoScroller({ scroll: 'top' });
`

To scroll at the bottom:

`js
$(".nano").nanoScroller({ scroll: 'bottom' });
`

To scroll at the top with an offset value:

`js
$(".nano").nanoScroller({ scrollTop: value });
`

To scroll at the bottom with an offset value:

`js
$(".nano").nanoScroller({ scrollBottom: value });
`

To scroll to an element:

`js
$(".nano").nanoScroller({ scrollTo: $('#a_node') });
`

#### stop:

To stop the operation. This option will tell the plugin to disable all event bindings and hide the gadget scrollbar from the UI.

`js
$(".nano").nanoScroller({ stop: true });
`

#### destroy:

Destroys nanoScroller and restores browser's native scrollbar.

`js
$(".nano").nanoScroller({ destroy: true });
`

#### flash:

To flash the scrollbar gadget for an amount of time defined in plugin settings (_defaults to 1,5s_). Useful if you want to show the user (e.g. on pageload) that there is more content waiting for him.

`js
$(".nano").nanoScroller({ flash: true });
`

#### nanoScroller();

Refresh the scrollbar. This simply re-calculates the position and height of the scrollbar gadget.

`js
$(".nano").nanoScroller();
`

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#### 'scrollend'

A custom 'scrollend' event is triggered on the element every time the user has scrolled to the end of the content element (does not get triggered more than once when user tries to scroll down and has already reached the end of scrollable content).

`js
$(".nano").bind("scrollend", function(e){
console.log("current HTMLDivElement", e.currentTarget);
});
`

Some browsers trigger this event more than once each time, so to listen to the custom event, instead of using jQuery's normal .bind or .on, you most likely want to use this tiny jQuery debounce plugin to prevent browsers from firing your function more than once every 100ms.

`js
$(".nano").debounce("scrollend", function() {
alert("The end");
}, 100);
`

#### 'scrolltop'

Same as the 'scrollend' event, but it is triggered every time the user has scrolled to the top of the content element.

#### 'update'

Same as the 'scrolltop' and 'scrollend' events, but it's triggered every time the user scrolls. It also carries a JavaScript object with the current position, the maximum height and the direction (up or down).

`js
$(".nano").on("update", function(event, values){
console.debug( values );
});
`

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There are a few options that you can change when running nanoScroller, e.g. $(".nano").nanoScroller({ paneClass: 'myclass' });

#### iOSNativeScrolling

Set to true if you want to use native scrolling in iOS 5+. This will disable your custom nanoScroller scrollbar in iOS 5+ and use the native one instead. While the native iOS scrollbar usually works much better, there could possibly be bugs in certain situations.

Notice that .pane and .slider elements are not generated/added for devices that support iOS native scrolling when iOSNativeScrolling option is enabled.

__Default:__ false

`js
$(".nano").nanoScroller({ iOSNativeScrolling: true });
`

#### sliderMinHeight

Sets the minimum height of the slider element.

__Default:__ 20

`js
$(".nano").nanoScroller({ sliderMinHeight: 40 });
`

#### sliderMaxHeight

Sets the maximum height of the slider element.

__Default:__ null

`js
$(".nano").nanoScroller({ sliderMaxHeight: 200 });
`

#### preventPageScrolling

Set to true to prevent page scrolling when top or bottom inside the content div is reached.

__Default:__ false

`js
$(".nano").nanoScroller({ preventPageScrolling: true });
`

#### disableResize

Set to true to disable the resize from nanoscroller. Useful if you want total control of the resize event. If you set this option to true remember to call the reset method so that the scroll don't have strange behavior.

__Default:__ false

`js
$(".nano").nanoScroller({ disableResize: true });
`

#### alwaysVisible

Set to true to stop the scrollbar from auto-hiding itself.

__Default:__ false

`js
$(".nano").nanoScroller({ alwaysVisible: true });
`

#### flashDelay:

Use this setting to specify the scrollbar hide delay in milliseconds if you have enabled the flash option.

`js
$(".nano").nanoScroller({ flashDelay: 1000 });
`

__Default:__ 1500

#### paneClass

A classname for scrollbar track element. If you change this setting, you also have to change it in the plugin's CSS file.

__Default:__ 'nano-pane'

`js
$(".nano").nanoScroller({ paneClass: 'scrollPane' });
`

#### sliderClass

A classname for scrollbar thumb element. If you change this setting, you also have to change it in the plugin's CSS file.

__Default:__ 'nano-slider'

`js
$(".nano").nanoScroller({ sliderClass: 'scrollSlider' });
`

#### contentClass

A classname for your content div. If you change this setting, you also have to change it in the plugin's CSS file.

__Default:__ 'nano-content'

`js
$(".nano").nanoScroller({ contentClass: 'sliderContent' });
`

#### tabIndex

Set the tab order of the scrollable content. Set to -1 to skip over the scrollable content when tabbing.

__Default:__ 0

`js
$(".nano").nanoScroller({ tabIndex: 0 });
`

How it works

!Fig 1.

The plugin works by creating a scrollbar gadget (with pre-defined css for styling) and then subscribing the .nano-content's scroll events to it. Mouse press and drag events are also subscribed to the .nano-pane and .nano-pane > .nano-slider to emulate the native scrollbar's mechanism. The system scrollbars are hidden from the viewport (Fig 1). By doing this, we still retain the natural scrolling experience provided by the OS.

We are still working on doing a horizontal scrolling feature. If you're interested in contributing to the project, you are free to fork it and create a pull request.

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To build nanoScroller from source you need the following libraries installed:

* Node.js and npm: homepage / download
* Grunt: homepage | npm install -g grunt-cli

#### How to build & contribute

1. Make sure that you have Grunt installed.
2. In terminal move to nanoscroller folder and run npm install to install all dependencies.
3. Make all Javascript changes in Coffeescript file(s), CSS changes in CSS file(s).
4. run grunt to build nanoScroller
5. Make sure that all changes are valid and open a pull request.

#### How to run tests

1. You need to have PhantomJS installed. On Mac OS X the easiest way is to install Homebrew and run brew install phantomjs.
2. run grunt test in terminal

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__Tested desktop browsers:__

* IE7+
* Firefox 3+
* Chrome
* Safari 4+
* Opera 11.60+

__Mobile support:__

* iOS 5+ (iPhone, iPad and iPod Touch)
iOS 4 (with a polyfill*)
* Android Firefox
Android 2.2/2.3 native browser (with a polyfill*)
Android Opera 11.6 (with a polyfill*)
* If you see it's broken on other tablets and mobile devices, please file a ticket in the git repo. Along with model name, and OS of the device.

If you find a bug, please report here at the issues section.

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You can use overthrow.js polyfill (~1.5kb minified and gzipped) to make nanoScroller work on many mobile devices. It emulates CSS overflow (overflow: auto;/overflow: scroll;) in devices that are lacking it.

To use overthrow, link to the javascript file in your HTML document...

`html

`

...and add an overthrow class to your content div.

`html



``

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- jamesflorentino
- kristerkari

Other people who have contributed code:

- weareoutman #170
- Sailias #138
- antonpinchuk #123
- miljan-aleksic #144
- callmevlad #122
- bobo76 #115
- mente #110
- livskiy #83
- iStefo #65
- tahajahangir #60
- n0valyfe #57
- johanbaath #42
- marcelombc #40, #46
- zacstewart #30
- michael-lefebvre #22, #29
- AlicanC #28
- camerond #26
- jesstelford #23
- lluchs #7, #8
- Dlom

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- Initially written by James Florentino in CoffeeScript
- Released under MIT License

[npm-url]: https://npmjs.org/package/nanoscroller
[npm-image]: http://img.shields.io/npm/v/nanoscroller.svg