lit-scroll
v3.3.0
Published
JS smooth scrolling library
Downloads
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LitScroll
A lightweight (1.5kb gzipped) custom scroll implementation. Written in TypeScript.
Installation
Install it from NPM:
npm i lit-scroll
Browser Support
The library uses a ResizeObserver (conditionally) to listen to scrollable element size change. In order to support dynamic scrollable container size change in Safari and IE, you should use ResizeObserver polyfill.
IMPORTANT: The library's default compilation target is ES6. If you need to support ES5 environments - consider transpiling it.
Usage
In your HTML:
<body>
<div data-lit-scroll="wrapper">
<div data-lit-scroll="container">
<!-- Layout here -->
</div>
</div>
</body>Note: wrapper element must be a descendant of <body>.
In your JS:
import createLitScroll from 'lit-scroll';
const scroll = createLitScroll({
// defaults
ease: 0.1,
mobile: false,
});Scroll sections
If your page is quite long, you can split your scroll container into scroll sections (via [data-lit-scroll="section"] attribute) to improve scrolling performance. This technique requires IntersectionObserver support. If none will be detected - [data-lit-scroll="section"] attribute will simply have no effect, nothing will break.
Syntax:
<body>
<div data-lit-scroll="wrapper">
<div data-lit-scroll="container">
<div data-lit-scroll="section">
<!-- Section content goes here -->
</div>
<div data-lit-scroll="section">
<!-- Section content goes here -->
</div>
<!-- ...and so on -->
</div>
</div>
</body>Options
| Option | Default | Description | | ------ | ------- | ------------------------------------------------------------------------------------------ | | ease | 0.1 | Number. Configures linear interpolation "strength". | | mobile | true | Boolean. Indicates whether or not library should take over native scroll on mobile devices |
API
Methods
| Method | Parameters | Description | | ------------------- | ------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | on | (event: 'scroll', fn: Function) | Add a scroll listener, which executes a specified function on every scroll change. Callback parameters: docScrollValue (current browser scroll value), scrollValue (current interpolated value), maxHeight (max scroll height), speed (positive if scrolling down, negative otherwise). | | off | (event: 'scroll', fn: Function) | Remove a scroll listener | | scrollTo | (target: (string | number | Element) | Scroll to element | Element, opts: { native?: boolean }) | Scroll to an element (via selector, document top offset, or element reference) | | getCurrentValue | none | Get current document scroll value | | getCurrentLerpValue | none | Get current lerp scroll value | | getSpeed | none | Get current speed value | | disable | none | Disable scrolling | | enable | none | Enable scrolling | | isEnabled | none | Get scroll lock state. Returns boolean value. scrolling | | destroy | none | Destroy an instance |