perfect scrollbars: added README
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# `perfect-scrollbar`
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Minimalistic but perfect custom scrollbar plugin
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[](https://travis-ci.org/noraesae/perfect-scrollbar)
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If you want information of old versions<0.6.0, please refer to
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[an old documentation](https://github.com/noraesae/perfect-scrollbar/tree/0.5.9).
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## Why perfect-scrollbar?
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I was once working on a personal project, and trying to find the jQuery
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scrollbar plugin that's *perfect*. But there was no *perfect* one.
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That's why I decided to make one.
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perfect-scrollbar is minimalistic but *perfect* (for me, and maybe for most developers)
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scrollbar plugin working with jQuery or vanilla JavaScript as well.
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I hope you love it!
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## [Demo](http://noraesae.github.com/perfect-scrollbar/)
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[It's on the GitHub Pages](http://noraesae.github.com/perfect-scrollbar/).
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## What does *perfect* mean?
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*perfect* means...
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* There should be no css change on any original element.
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* The scrollbar should not affect the original design layout.
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* The design of the scrollbar should be (nearly) fully customizable.
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* If the size of the container or the content changes, the scrollbar
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size and position should be able to change.
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* *New!* It should work with vanilla JavaScript and major tools like
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NPM or Browserify.
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## Then perfect-scrollbar is really *perfect*?
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* perfect-scrollbar has some requirements, but doesn't change or add
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any style on original elements.
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* perfect-scrollbar is designed not to have width or height. It's fixed
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on the right and bottom side of the container.
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* You can change nearly all css styles of the scrollbar. The scrollbar
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design has no dependency on scripts.
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* perfect-scrollbar supports an 'update' function. Whenever you need
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to update the size or position of the scrollbar, just update.
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* Additionally, perfect-scrollbar uses 'scrollTop' and 'scrollLeft',
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not absolute positioning or something messy.
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* perfect-scrollbar supports RTL perfectly on both WebKit and Gecko based browsers.
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It's cool, isn't it?
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## Install
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The best way to install and use perfect-scrollbar is with NPM.
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It's registered on [npm](https://www.npmjs.org/package/perfect-scrollbar) as `perfect-scrollbar`.
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```
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$ npm install perfect-scrollbar
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```
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You can download the latest stable version with download links [here](http://noraesae.github.io/perfect-scrollbar/).
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You also can find all releases on [Releases](https://github.com/noraesae/perfect-scrollbar/releases).
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If you want to use the development version of the plugin, use the
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source files which are not minified. They're in the `src` directory.
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The development version may be unstable, but some known bugs may
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have been fixed.
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```
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$ git clone https://github.com/noraesae/perfect-scrollbar.git
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$ cd perfect-scrollbar/src
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$ npm install
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$ gulp # will lint and build the source code.
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```
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There is a Bower package for perfect-scrollbar as well. It is managed
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under the [perfect-scrollbar-bower](https://github.com/noraesae/perfect-scrollbar-bower)
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repository. The plugin is registered as `perfect-scrollbar`.
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```
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$ bower install perfect-scrollbar
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```
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You can also load it from [cdnjs](http://cdnjs.com/).
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It is registered as [`jquery.perfect-scrollbar`](http://www.cdnjs.com/libraries/jquery.perfect-scrollbar).
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## Requirements
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To make this plugin *perfect*, some requirements were unavoidable.
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But, they're all very trivial and there is nothing to worry about.
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The following requirements should meet.
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* the container must have a 'position' css style.
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The following requirements are included in the basic CSS, but please
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keep in mind when you'd like to change the CSS files.
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* the container must have an 'overflow:hidden' css style.
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* the scrollbar's position must be 'absolute'.
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* the scrollbar-x must have a 'bottom' css style, and the scrollbar-y
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must have a 'right' css style.
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## How to use
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First of all, please check if the container element meets the
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requirements.
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```html
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<link rel='stylesheet' href='dist/css/perfect-scrollbar.css' />
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<style>
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#container {
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position: relative;
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height: 100%; /* Or whatever you want (eg. 400px) */
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}
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</style>
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```
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I would recommend using the plugin with NPM and CommonJS module system
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like Browserify.
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```javascript
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var Ps = require('perfect-scrollbar');
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```
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Or you can just load the script file as usual.
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```html
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<script src='dist/js/perfect-scrollbar.js'></script>
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```
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To initialise the plugin, `Ps.initialize` is used.
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```javascript
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var container = document.getElementById('container');
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Ps.initialize(container);
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```
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It can be initialised with optional parameters.
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```javascript
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Ps.initialize(container, {
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wheelSpeed: 2,
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wheelPropagation: true,
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minScrollbarLength: 20
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});
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```
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If the size of your container or content changes, call `update`.
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```javascript
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Ps.update(container);
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```
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If you want to destory the scrollbar, use `destroy`.
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```javascript
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Ps.destroy(container);
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```
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If you want to scroll to somewhere, just use a `scrollTop`
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property and update.
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```javascript
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container.scrollTop = 0;
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Ps.update(container);
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```
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You can also get information about how to use the plugin
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from code in the `examples` directory of the source tree.
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## jQuery
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As you may already know, perfect-scrollbar was a jQuery plugin.
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And it *is* as well. There's a jQuery adaptor and the plugin can
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be used in the same way it used to be used before.
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I also recommend using NPM and CommonJS here, but it's not mandatory.
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```javascript
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var $ = require('jquery');
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require('perfect-scrollbar/jquery')($);
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```
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For sure, you can just import a built script.
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```html
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<script src='dist/js/perfect-scrollbar.jquery.js'></script>
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```
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After importing it, you can use the plugin in the usual way.
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```javascript
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$('#container').perfectScrollbar(); // Initialize
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$('#container').perfectScrollbar({ ... }); // with options
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$('#container').perfectScrollbar('update'); // Update
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$('#container').perfectScrollbar('destroy'); // Destroy
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```
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## RequireJS usage
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For RequireJS loader, no need to write shim, simply import two libs:
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```javascript
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require.config({
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paths: {
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perfectScrollbarJQuery: '.../perfect-scrollbar.jquery',
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perfectScrollbar: '.../perfect-scrollbar',
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}
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...
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})
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```
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and load `perfectScrollbar` in the initialiser of your app:
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```javascript
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// for vanilla JS:
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window.Ps = require('perfectScrollbar');
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// for jQuery:
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require('perfectScrollbarJQuery');
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```
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## AngularJS + RequireJS usage
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With the require.config settings above, at the beginning of your app module
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definition, you can have following code:
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```javascript
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define([
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'angular',
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'perfectScrollbar',
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'perfectScrollbarJquery'
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],
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function (angular) {
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var myApp = angular.module('myApp', [])
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.run(function() {
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window.Ps = require('perfectScrollbar');
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require('perfectScrollbarJQuery');
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})
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return myApp;
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});
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```
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And initialise perfectScrollbar in a controller:
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```javascript
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// by vanilla JS:
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var container = document.getElementById('imgLoader');
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Ps.initialize(container);
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Ps.update(container);
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// or by jQuery:
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var imgLoader = $("#imgLoader")
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imgLoader.perfectScrollbar();
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```
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## Optional parameters
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perfect-scrollbar supports optional parameters.
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### wheelSpeed
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The scroll speed applied to mousewheel event.
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**Default: 1**
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### wheelPropagation
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If this option is true, when the scroll reaches the end of the side, mousewheel event will be propagated to parent element.
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**Default: false**
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### swipePropagation
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If this option is true, when the scroll reaches the end of the side, touch scrolling will be propagated to parent element.
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**Default: true**
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### minScrollbarLength
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When set to an integer value, the thumb part of the scrollbar will not shrink below that number of pixels.
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**Default: null**
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### maxScrollbarLength
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When set to an integer value, the thumb part of the scrollbar will not expand over that number of pixels.
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**Default: null**
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### useBothWheelAxes
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When set to true, and only one (vertical or horizontal) scrollbar is visible then both vertical and horizontal scrolling will affect the scrollbar.
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**Default: false**
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### useKeyboard
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When set to true, the scroll works with arrow keys on the keyboard. The element is scrolled only when the mouse cursor hovers the element.
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**Default: true**
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### suppressScrollX
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When set to true, the scroll bar in X axis will not be available, regardless of the content width.
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**Default: false**
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### suppressScrollY
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When set to true, the scroll bar in Y axis will not be available, regardless of the content height.
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**Default: false**
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### scrollXMarginOffset
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The number of pixels the content width can surpass the container width without enabling the X axis scroll bar. Allows some "wiggle room" or "offset break", so that X axis scroll bar is not enabled just because of a few pixels.
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**Default: 0**
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### scrollYMarginOffset
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The number of pixels the content height can surpass the container height without enabling the Y axis scroll bar. Allows some "wiggle room" or "offset break", so that Y axis scroll bar is not enabled just because of a few pixels.
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**Default: 0**
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### stopPropagationOnClick
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When set to false, when clicking on a rail, the click event will be allowed to propagate.
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**Default: true**
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### useSelectionScroll
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When set to true, you can scroll the container by selecting text and move the cursor.
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**Default: false**
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## Events
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perfect-scrollbar dispatches custom events.
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### ps-scroll-y
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This event fires when the y-axis is scrolled in either direction.
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### ps-scroll-x
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This event fires when the x-axis is scrolled in either direction.
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### ps-scroll-up
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This event fires when scrolling upwards.
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### ps-scroll-down
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This event fires when scrolling downwards.
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### ps-scroll-left
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This event fires when scrolling to the left.
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### ps-scroll-right
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This event fires when scrolling to the right.
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### ps-y-reach-start
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This event fires when scrolling reaches the start of the y-axis.
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### ps-y-reach-end
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This event fires when scrolling reaches the end of the y-axis (useful for infinite scroll).
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### ps-x-reach-start
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This event fires when scrolling reaches the start of the x-axis.
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### ps-x-reach-end
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This event fires when scrolling reaches the end of the x-axis.
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You can listen to these events either with vanilla JavaScript
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```javascript
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document.addEventListener('ps-scroll-x', function () {
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// ...
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})
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```
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or with jQuery
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```javascript
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$(document).on('ps-scroll-x', function () {
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// ...
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})
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```
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## Contribution
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#### Please read [Contributing](https://github.com/noraesae/perfect-scrollbar/wiki/Contributing) in the wiki before making any contribution.
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I *really* welcome contributions! Please feel free to fork and issue pull requests when...
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* You have a very nice idea to improve this plugin!
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* You found a bug!
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* You're good at English and can help my bad English!
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For IE problems, please refer to [IE Support](https://github.com/noraesae/perfect-scrollbar#ie-support).
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## IE Support
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The plugin would work in IEs >= IE9 (not well, though).
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**The patches to fix problems in IE<=8 won't be accepted.**
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When old IEs should be supported, please fork the project and
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make patches personally.
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## Helpdesk
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If you have any idea to improve this project or any problem
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using this, please feel free to upload an
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[issue](https://github.com/noraesae/perfect-scrollbar/issues).
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For common problems there is a
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[FAQ](https://github.com/noraesae/perfect-scrollbar/wiki/FAQ) wiki page. Please check the page before uploading an issue.
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## License
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The MIT License (MIT) Copyright (c) 2015 Hyunje Alex Jun and other contributors.
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Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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