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# OverlayScrollbars > OverlayScrollbars is a javascript scrollbar plugin that hides native scrollbars, provides custom styleable overlay scrollbars and keeps the native functionality and feeling. ## Why I created this plugin because I hate ugly and space consuming scrollbars. Similar plugins haven't met my requirements in terms of features, quality, simplicity, license or browser support. ## Goals & Features - Simple, powerful and well documented API - High browser compatibility - Firefox 59+, Chrome 55+, Opera 42+, Edge 12+, Safari 10+ and IE 11 - Can be run on the server - SSR, SSG and ISR support - Tested on various devices - Mobile, Desktop and Tablet - Tested with various (and mixed) inputs - Mouse, touch and pen - Treeshaking - bundle only what you really need - Automatic update detection - no polling - Usage of latest browser features - best performance in new browsers - Bidirectional - LTR or RTL direction support - Supports usage on the `body` element - Simple and effective scrollbar styling - Highly customizable - TypeScript support - fully written in TypeScript - Dependency free - 100% self written to ensure small size and best functionality - High quality and fully typed framework versions for [`react`](https://github.com/KingSora/OverlayScrollbars/tree/master/packages/overlayscrollbars-react), [`vue`](https://github.com/KingSora/OverlayScrollbars/tree/master/packages/overlayscrollbars-vue), [`angular`](https://github.com/KingSora/OverlayScrollbars/tree/master/packages/overlayscrollbars-ngx), [`svelte`](https://github.com/KingSora/OverlayScrollbars/tree/master/packages/overlayscrollbars-svelte) and [`solid`](https://github.com/KingSora/OverlayScrollbars/tree/master/packages/overlayscrollbars-solid). ## Choose your framework Additionally to the vanilla JavaScript version you can use the official framework components & utilities:

## Getting started ### npm & node OverlayScrollbars can be downloaded from [npm](https://www.npmjs.com/package/overlayscrollbars) or the package manager of your choice: ```sh npm install overlayscrollbars ``` After installation it can be imported: ```js import 'overlayscrollbars/overlayscrollbars.css'; import { OverlayScrollbars } from 'overlayscrollbars'; ``` > __Note__: In older node versions use `'overlayscrollbars/styles/overlayscrollbars.css'` as the import path for the CSS file. ### Manual download & embedding

These instructions are for quick prototyping or old stacks. Click here to read them.

You can use OverlayScrollbars without any bundler or package manager. Simply download it from the [Releases](https://github.com/KingSora/OverlayScrollbars/releases) or use a [CDN](https://cdnjs.com/libraries/overlayscrollbars). - Use the javascript files with the `.browser` extension. - If you target old browsers use the `.es5` javascript file, for new browsers `.es6`. - For production use the javascript / stylesheet files with the `.min` extension. Embedd OverlayScrollbars manually in your HTML: ```html ``` You can use the global variable `OverlayScrollbarsGlobal` to access the api: ```js var OverlayScrollbars = OverlayScrollbarsGlobal.OverlayScrollbars; OverlayScrollbars(document.body, {}); ```

## Initialization > __Note__: During initialization its expected that the CSS file is loaded and parsed by the browser. You can initialize either directly with an `Element` or with an `Object` where you have more control over the initialization process. ```js // simple initialization with an element const osInstance = OverlayScrollbars(document.querySelector('#myElement'), {}); ``` ### Bridging initialization flickering If you initialize OverlayScrollbars it needs a few milliseconds to create and append all the elements to the DOM. While this period the native scrollbars are still visible and are switched out after the initialization is finished. This is perceived as flickering. To fix this behavior apply the `data-overlayscrollbars-initialize` attribute to the target element (and `html` element if the target element is `body`). ### Initialization with an Object

This is a in depth topic. Click here to read it.

> __Note__: For now please refer to the TypeScript definitions for a more detailed description of all possibilities. The only required field is the `target` field. This is the field to which the plugin is applied to. If you use the object initialization only with the `target` field, the outcome is equivalent to the element initialization: ```js // Both initializations have the same outcome OverlayScrollbars(document.querySelector('#myElement'), {}); OverlayScrollbars({ target: document.querySelector('#myElement') }, {}); ``` In the initialization object you can specify how the library is handling generated elements. For example you can appoint an existing element as the `viewport` element. Like this the library won't generate it but take the specified element instead: ```js OverlayScrollbars({ target: document.querySelector('#target'), elements: { viewport: document.querySelector('#viewport'), }, }, {}); ``` This is very useful if you have a fixed DOM structure and don't want OverlayScrollbars to generate its own elements. Those cases arise very often when you want an other library to work together with OverlayScrollbars. --- You can also decide to which element the scrollbars should be applied to: ```js OverlayScrollbars({ target: document.querySelector('#target'), scrollbars: { slot: document.querySelector('#target').parentElement, }, }, {}); ``` --- And last but not least you can decide when the initialization should be canceled: ```js OverlayScrollbars({ target: document.querySelector('#target'), cancel: { nativeScrollbarsOverlaid: true, body: null, } }, {}); ``` In the above example the initialization is canceled when the native scrollbars are overlaid or when your target is a `body` element and the plugin determined that a initialization to the `body` element would affect native functionality like `window.scrollTo`.

## Options You can initialize OverlayScrollbars with an initial set of options, which can be changed at any time with the `options` method: ```js OverlayScrollbars(document.querySelector('#myElement'), { overflow: { x: 'hidden', }, }); ``` ### Options in depth

This is a in depth topic. Click here to read it.

The default options are: ```js const defaultOptions = { paddingAbsolute: false, showNativeOverlaidScrollbars: false, update: { elementEvents: [['img', 'load']], debounce: [0, 33], attributes: null, ignoreMutation: null, }, overflow: { x: 'scroll', y: 'scroll', }, scrollbars: { theme: 'os-theme-dark', visibility: 'auto', autoHide: 'never', autoHideDelay: 1300, dragScroll: true, clickScroll: false, pointers: ['mouse', 'touch', 'pen'], }, }; ``` ### `paddingAbsolute` | type | default | | :--- | :--- | | `boolean` | `false` | Indicates whether the padding for the content shall be absolute. ### `showNativeOverlaidScrollbars` | type | default | | :--- | :--- | | `boolean` | `false` | Indicates whether the native overlaid scrollbars shall be visible. ### `update.elementEvents` | type | default | | :--- | :--- | | `Array<[string, string]> \| null` | `[['img', 'load']]` | An array of tuples. The first value in the tuple is an `selector` and the second value are `event names`. The plugin will update itself if any of the elements with the specified selector will emit any specified event. The default value can be interpreted as "The plugin will update itself if any `img` element emits an `load` event." ### `update.debounce` | type | default | | :--- | :--- | | `[number, number] \| number \| null` | `[0, 33]` | > __Note__: If 0 is used for the timeout, `requestAnimationFrame` instead of `setTimeout` is used for the debounce. Debounces the `MutationObserver` which tracks changes to the content. If a **tuple** is passed, the first value is the timeout and second is the max wait. If only a **number** is passed you specify only the timeout and there is no max wait. With **null** there is no debounce. **Usefull to fine-tune performance.** ### `update.attributes` | type | default | | :--- | :--- | | `string[] \| null` | `null` | > __Note__: There is a base array of attributes that the `MutationObserver` always observes, even if this option is `null`. An array of additional attributes that the `MutationObserver` should observe for the content. ### `update.ignoreMutation` | type | default | | :--- | :--- | | `((mutation) => any) \| null` | `null` | A function which receives a [`MutationRecord`](https://developer.mozilla.org/en-US/docs/Web/API/MutationRecord) as an argument. If the function returns a truthy value the mutation will be ignored and the plugin won't update. **Usefull to fine-tune performance.** ### `overflow.x` | type | default | | :--- | :--- | | `string` | `'scroll'` | > __Note__: Valid values are: `'hidden'`, `'scroll'`, `'visible'`, `'visible-hidden'` and `'visible-scroll'`. The overflow behavior for the horizontal (x) axis. ### `overflow.y` | type | default | | :--- | :--- | | `string` | `'scroll'` | > __Note__: Valid values are: `'hidden'`, `'scroll'`, `'visible'`, `'visible-hidden'` and `'visible-scroll'`. The overflow behavior for the vertical (y) axis. ### `scrollbars.theme` | type | default | | :--- | :--- | | `string \| null` | `'os-theme-dark'` | Applies the specified theme (classname) to the scrollbars. ### `scrollbars.visibility` | type | default | | :--- | :--- | | `string` | `'auto'` | > __Note__: Valid values are: `'visible'`, `'hidden'`, and `'auto'`. The base visibility of the scrollbars. ### `scrollbars.autoHide` | type | default | | :--- | :--- | | `string` | `'never'` | > __Note__: Valid values are: `'never'`, `'scroll'`, `'leave'` and `'move'`. The possibility to hide visible scrollbars automatically after a certain user action. ### `scrollbars.autoHideDelay` | type | default | | :--- | :--- | | `number` | `1300` | The delay in milliseconds before the scrollbars are hidden automatically. ### `scrollbars.dragScroll` | type | default | | :--- | :--- | | `boolean` | `true` | Indicates whether you can drag the scrollbar handles for scrolling. ### `scrollbars.clickScroll` | type | default | | :--- | :--- | | `boolean` | `false` | > __Note__: This options requires the **ClickScrollPlugin** to work. Indicates whether you can click on the scrollbar track for scrolling. ### `scrollbars.pointers` | type | default | | :--- | :--- | | `string[] \| null` | `['mouse', 'touch', 'pen']` | The [`PointerTypes`](https://developer.mozilla.org/en-US/docs/Web/API/PointerEvent/pointerType) the plugin should react to.

## Events You can initialize OverlayScrollbars with an initial set of events, which can be managed at any time with the `on` and `off` methods: ```js OverlayScrollbars(document.querySelector('#myElement'), {}, { updated(osInstance, onUpdatedArgs) { // ... } }); ``` ### Events in depth

This is a in depth topic. Click here to read it.

## Instance > __Note__: For now please refer to the TypeScript definitions for a more detailed description. ```ts interface OverlayScrollbars { options(): Options; options(newOptions: PartialOptions, pure?: boolean): Options; on(eventListeners: EventListeners, pure?: boolean): () => void; on(name: N, listener: EventListener): () => void; on(name: N, listener: EventListener[]): () => void; off(name: N, listener: EventListener): void; off(name: N, listener: EventListener[]): void; update(force?: boolean): boolean; state(): State; elements(): Elements; destroy(): void; } ``` ## Static Methods > __Note__: For now please refer to the TypeScript definitions for a more detailed description. ```ts interface OverlayScrollbarsStatic { (target: InitializationTarget): OverlayScrollbars | undefined; (target: InitializationTarget, options: PartialOptions, eventListeners?: EventListeners): OverlayScrollbars; plugin(plugin: Plugin | Plugin[]): void; valid(osInstance: any): osInstance is OverlayScrollbars; env(): Environment; } ``` ## Styling OverlayScrollbars comes with two themes called `os-theme-dark` and `os-theme-light`. You can use the `scrollbars.theme` option to change the theme. Custom themes can be done in multiple ways. The easiest and fastest is to use the predefined set of `CSS Custom Properties` aka. CSS variables. In case those aren't enought you can add custom class names or add custom styling to the existing class names. ### Styling in depth

This is a in depth topic. Click here to read it.

### CSS Custom properties OverlayScrollbars provides a set of `CSS Custom Properties` which makes scrollbar styling easy and fast: ```scss .os-scrollbar { // The size of the scrollbar --os-size: 0; // The axis-perpedicular padding of the scrollbar (horizontal: padding-y, vertical: padding-x) --os-padding-perpendicular: 0; // The axis padding of the scrollbar (horizontal: padding-x, vertical: padding-y) --os-padding-axis: 0; // The border radius of the scrollbar track --os-track-border-radius: 0; // The background of the scrollbar track --os-track-bg: none; // The :hover background of the scrollbar track --os-track-bg-hover: none; // The :active background of the scrollbar track --os-track-bg-active: none; // The border of the scrollbar track --os-track-border: none; // The :hover background of the scrollbar track --os-track-border-hover: none; // The :active background of the scrollbar track --os-track-border-active: none; // The border radius of the scrollbar handle --os-handle-border-radius: 0; // The background of the scrollbar handle --os-handle-bg: none; // The :hover background of the scrollbar handle --os-handle-bg-hover: none; // The :active background of the scrollbar handle --os-handle-bg-active: none; // The border of the scrollbar handle --os-handle-border: none; // The :hover border of the scrollbar handle --os-handle-border-hover: none; // The :active border of the scrollbar handle --os-handle-border-active: none; // The min size of the scrollbar handle --os-handle-min-size: 33px; // The max size of the scrollbar handle --os-handle-max-size: none; // The axis-perpedicular size of the scrollbar handle (horizontal: height, vertical: width) --os-handle-perpendicular-size: 100%; // The :hover axis-perpedicular size of the scrollbar handle (horizontal: height, vertical: width) --os-handle-perpendicular-size-hover: 100%; // The :active axis-perpedicular size of the scrollbar handle (horizontal: height, vertical: width) --os-handle-perpendicular-size-active: 100%; // Increases the interactive area of the scrollbar handle. --os-handle-interactive-area-offset: 0; } ``` You can alter the properties either for both scrollbars at once or per scrollbar axis: ```scss // horizontal and vertical scrollbar are 10px .os-theme-custom { --os-size: 10px; } // horizontal scrollbar is 10px .os-theme-custom.os-scrollbar-horizontal { --os-size: 10px; } // vertical scrollbar is 20px .os-theme-custom.os-scrollbar-vertical { --os-size: 20px; } ``` Since scrollbar styles are usually simple, this set of options should be enough to get your desired styling. In case you need more freedom you can create your own styles by adding styling to the base class names described in the next section. ### Scrollbars structure and CSS class names The scrollbars HTML markup looks like: ```html

``` The class names are simplified, in a real application the `.os-scrollbar` element can have additional class names which modify the appearance (mostly visibility and alignment). Below is a list of the most important class names you will encounter: | CSS class name | description | | :--- | :--- | | `.os-scrollbar` | The root element of a scrollbar. | | `.os-scrollbar-rtl` | Indicates a `RTL` direction of the host element the scrollbar belongs to. | | `.os-scrollbar-horizontal` | The root element of a horizontal scrollbar. | | `.os-scrollbar-vertical` | The root element of a vertical scrollbar. | | `.os-scrollbar-handle-interactive` | Indicates that the handle inside the scrollbar is interactive (`scrollbars.dragScroll` is `true`). | | `.os-scrollbar-track-interactive` | Indicates that the track inside the scrollbar is interactive (`scrollbars.clickScroll` is `true`). | | `.os-scrollbar-track` | The track element. This is the track of the nested handle element. If `scrollbars.clickScroll` is `true` this is the element users can click to change the scroll offset. | | `.os-scrollbar-handle` | The handle element. If `scrollbars.dragScroll` is `true` this is the handle users can drag to change the scroll offset. | If you create your own theme, please only use the classes listed above. All other classes are modifier classes used to change visibility, alignment and pointer-events of the scrollbars.

## Plugins Everything thats considered not core functionality or old browser compatibility is exposed via a plugin. This is done because all unused plugins are treeshaken and thus won't end up in your final bundle. OverlayScrollbars comes with the following plugins: - **ScrollbarsHidingPlugin**: Is needed for old browsers which aren't supporting nativ scrollbar styling features. [You can find the list of browsers where you need this plugin here](https://caniuse.com/?search=scrollbar%20styling) (note that even though `iOS Safari >= 14` is marked as unsupported you only need this plugin for `iOS < 7.1`). - **SizeObserverPlugin**: Is needed for old browsers which aren't supporting the `ResizeObserver` api. [You can find the list of browsers where you need this plugin here](https://caniuse.com/?search=ResizeObserver) - **ClickScrollPlugin**: If you want to use the option `scrollbars: { clickScroll: true }`. ### Consuming Plugins Plugins are consumed like: ```ts import { OverlayScrollbars, ScrollbarsHidingPlugin, SizeObserverPlugin, ClickScrollPlugin } from 'overlayscrollbars'; // single plugin OverlayScrollbars.plugin(ScrollbarsHidingPlugin); // multiple plugins OverlayScrollbars.plugin([SizeObserverPlugin, ClickScrollPlugin]); ``` ### Writing Plugins > __Note__: For now please refer to the TypeScript definitions for a more detailed description. You can write and publish your own Plugins. This section is a work in progress. ## FAQ

How do I get / set the scroll position of an element I applied OverlayScrollbars to?

If you applied `OverlayScrollbars` to the `body` element you can use [`window.scrollX`](https://developer.mozilla.org/en-US/docs/Web/API/Window/scrollX), [`window.scrollY`](https://developer.mozilla.org/en-US/docs/Web/API/Window/scrollY), [`window.scroll`](https://developer.mozilla.org/en-US/docs/Web/API/Window/scroll), [`window.scrollTo`](https://developer.mozilla.org/en-US/docs/Web/API/Window/scrollTo), [`window.scrollBy`](https://developer.mozilla.org/en-US/docs/Web/API/Window/scrollBy) or any other native api. If the plugin was applied to any other element you have to get the `viewport` element with the `instance.elements()` function first. With this element you can use [`element.scrollTop`](https://developer.mozilla.org/en-US/docs/Web/API/Element/scrollTop), [`element.scrollLeft`](https://developer.mozilla.org/en-US/docs/Web/API/Element/scrollLeft), [`element.scroll`](https://developer.mozilla.org/en-US/docs/Web/API/Element/scroll), [`element.scrollTo`](https://developer.mozilla.org/en-US/docs/Web/API/Element/scrollTo), [`element.scrollBy`](https://developer.mozilla.org/en-US/docs/Web/API/Element/scrollBy) or any other native api. ```js const { viewport } = osInstance.elements(); const { scrollLeft, scrollTop } = viewport; // get scroll offset viewport.scrollTo({ top: 0 }); // set scroll offset ```

Is it possible to limit / adjust the scrollbar handle length?

You can adjust a scrollbars handle length by setting a `min-width / min-height` and `max-width / max-height` style: ```css /* horizontal boundaries */ .os-scrollbar-horizontal .os-scrollbar-handle { min-width: 50px; max-width: 200px; } /* vertical boundaries */ .os-scrollbar-vertical .os-scrollbar-handle { min-height: 40px; max-height: 40px; } ``` You can assign the same value to both properties to force the scrollbar to be always the same size. Setting the `width` and `height` properties won't work since those are set by the plugin automatically.

## Feature comparison to `v1` - The `scroll` function is missing. Planned as a `plugin`. (WIP) - Initialization to the `textarea` element isn't supported yet. Planned as a `plugin`. (WIP) ## Sponsors

Thanks to BrowserStack for sponsoring open source projects and letting me test OverlayScrollbars for free.

## Future Plans - Provide plugin based support for missing features. (treeshakeable) - Frequent updates in terms of bug-fixes and enhancements. (always use latest browser features) - Improve tests. (unit & browser tests) ## License MIT

	Stars	Issues	Version	Updated	Created
gemini-scrollbar	414	22	1.5.3	5 years ago	8 years ago
overlayscrollbars	2,631	11	2.1.0	2 months ago	5 years ago
react-perfect-scrollbar	465	56	1.5.8	3 years ago	8 years ago

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