Locomotive Scroll

Detection of elements in viewport & smooth scrolling with parallax effects.

Installation

⚠️ Scroll-hijacking is a controversial practice that can cause usability, accessibility, and performance issues. Please use responsibly.

npm install locomotive-scroll

Usage

Basic

With simple detection.

HTML

<h1 data-scroll>Hey</h1>
<p data-scroll>👋</p>

CSS

Add the base styles to your CSS file.

locomotive-scroll.css

JS

With a bundler

import LocomotiveScroll from 'locomotive-scroll';

const scroll = new LocomotiveScroll();

Or without

<script src="locomotive-scroll.min.js"></script>
<script>
    (function () {
        var scroll = new LocomotiveScroll();
    })();
</script>

Get the JS file.

Smooth

With smooth scrolling and parallax.

<div data-scroll-container>
    <div data-scroll-section>
        <h1 data-scroll>Hey</h1>
        <p data-scroll>👋</p>
    </div>
    <div data-scroll-section>
        <h2 data-scroll data-scroll-speed="1">What's up?</h2>
        <p data-scroll data-scroll-speed="2">😬</p>
    </div>
</div>

import LocomotiveScroll from 'locomotive-scroll';

const scroll = new LocomotiveScroll({
    el: document.querySelector('[data-scroll-container]'),
    smooth: true
});

Note: scroll-sections are optional but recommended to improve performance, particularly in long pages.

Advanced

Make it do what you want.

With methods

<section id="js-target">Come here please.</section>

import LocomotiveScroll from 'locomotive-scroll';

const scroll = new LocomotiveScroll();
const target = document.querySelector('#js-target');

scroll.scrollTo(target);

With events

<!-- Using modularJS -->
<div data-scroll data-scroll-call="function, module">Trigger</div>
<!-- Using jQuery events -->
<div data-scroll data-scroll-call="EVENT_NAME">Trigger</div>
<!-- Or do it your own way 😎 -->
<div data-scroll data-scroll-call="{y,o,l,o}">Trigger</div>

import LocomotiveScroll from 'locomotive-scroll';

const scroll = new LocomotiveScroll();

scroll.on('call', func => {
    // Using modularJS
    this.call(...func);
    // Using jQuery events
    $(document).trigger(func);
    // Or do it your own way 😎
});

Instance options

Option	Type	Default	Description
`el`	`object`	`document`	Scroll container element.
`name`	`string`	`'scroll'`	Data attribute prefix (`data-scroll-xxxx`).
`offset`	`array(2)`	`[0,0]`	Global in-view trigger offset : `[bottom,top]` Use a string with `%` to use a percentage of the viewport height. Use a numeric value for absolute pixels unit. E.g. `["30%",0]`, `[100,0]`, `["30%", 100]`
`repeat`	`boolean`	`false`	Repeat in-view detection.
`smooth`	`boolean`	`false`	Smooth scrolling.
`initPosition`	`object`	`{ x: 0, y: 0 }`	An `object` defining the initial scroll coordinates on a smooth instance. For example: `{ x: 0, y: 1000 }`
`direction`	`string`	`vertical`	Scroll direction: `vertical` or `horizontal`
`lerp`	`number`	`0.1`	Linear interpolation (lerp) intensity. Float between `0` and `1`. This defines the "smoothness" intensity. The closer to `0`, the smoother.
`getDirection`	`boolean`	`false`	Add direction to scroll event.
`getSpeed`	`boolean`	`false`	Add speed to scroll event.
`class`	`string`	`is-inview`	Element in-view class.
`initClass`	`string`	`has-scroll-init`	Initialize class.
`scrollingClass`	`string`	`has-scroll-scrolling`	Is scrolling class.
`draggingClass`	`string`	`has-scroll-dragging`	Is dragging class.
`smoothClass`	`string`	`has-scroll-smooth`	Has smooth scrolling class.
`scrollbarContainer`	`object`	`false`	Specifies the container element for the scrollbar to be appended in. If false, scrollbar will be appended to the body.
`scrollbarClass`	`string`	`c-scrollbar`	Scrollbar element class.
`multiplier`	`number`	`1`	Factor applied to the scroll delta, allowing to boost/reduce scrolling speed (regardless of the platform).
`firefoxMultiplier`	`number`	`50`	Boost scrolling speed of Firefox on Windows.
`touchMultiplier`	`number`	`2`	Multiply touch action to scroll faster than finger movement.
`scrollFromAnywhere`	`boolean`	`false`	By default locomotive-scroll listens for scroll events only on the scroll container (`el` option). With this option set to true, it listens on the whole document instead.
`gestureDirection`	`string`	`vertical`	Defines which gesture direction(s) scrolls in your instance. You can use : `vertical` `horizontal` `both`
`tablet` & `smartphone`	`object`		Object allowing to override some options for a particular context. You can specify: `smooth` `direction` `horizontalGesture` For `tablet` context you can also define `breakpoint` (integer, defaults to 1024) to set the max-width breakpoint for tablets.
`reloadOnContextChange`	`boolean`	`false`	Allows to reload the page when switching between `desktop`, `tablet` and `smartphone` contexts. It can be useful if your page changes a lot between contexts and you want to reset everything.
`resetNativeScroll`	`boolean`	`true`	Sets `history.scrollRestoration = 'manual'` and calls `window.scrollTo(0, 0)` on locomotive-scroll init in Native Class. Useful if you use transitions with native scrolling, otherwise we advise to set it to `false` if you don't want to break History API's scroll restoration feature.

Element attributes

Attribute	Values	Description
`data-scroll`		Detect if in-view.
`data-scroll-id`	`string`	(Optional) Useful if you want to scope your element and get the progress of your element in the viewport for example.
`data-scroll-container`		Defines the scroll container. Required for basic styling.
`data-scroll-section`		Defines a scrollable section. Splitting your page into sections may improve performance.
`data-scroll-class`	`string`	Element in-view class.
`data-scroll-offset`	`string`	Element in-view trigger offset : `bottom,top` First value is `bottom` offset, second (optional) is `top` offset. Percent is relative to viewport height, otherwise it's absolute pixels. E.g. `"10"`, `"100,50%"`, `"25%, 15%"`
`data-scroll-repeat`	`boolean`	Element in-view detection repeat.
`data-scroll-call`	`string`	Element in-view trigger call event.
`data-scroll-position`	`string`	`top`, `bottom`, `left` or `right` Window position of in-view trigger.
`data-scroll-speed`	`number`	Element parallax speed. A negative value will reverse the direction.
`data-scroll-delay`	`number`	Element's parallax lerp delay.
`data-scroll-direction`	`string`	Element's parallax direction. `vertical` or `horizontal`
`data-scroll-sticky`		Sticky element. Starts and stops at `data-scroll-target` position.
`data-scroll-target`	`string`	Target element's in-view position.

Instance methods

Method	Description	Arguments
`init()`	Reinitializes the scroll.
`on(eventName, function)`	Listen instance events ⬇.
`update()`	Updates all element positions.
`destroy()`	Destroys the scroll events.
`start()`	Restarts the scroll events.
`stop()`	Stops the scroll events.
`scrollTo(target, options)`	Scroll to a target.	`target`: Defines where you want to scroll. Available values types are : `node` : a dom element `string` : you can type your own selector, or use values `"top"` and `"bottom"` to reach scroll boundaries `int` : An absolute scroll coordinate in pixels `options` (optional, object) : Settings object. Available values are: `offset` (integer) : Defines an offset from your target. E.g. `-100` if you want to scroll 100 pixels above your target `callback` (function) : Called when scrollTo completes (note that it won't wait for lerp to stabilize) `duration` (integer) : Defines the duration of the scroll animation in milliseconds. Defaults to `1000` `easing` (array) : An `array` of 4 floats between 0 and 1 defining the bezier curve for the animation's easing. Defaults to `[0.25, 0.00, 0.35, 1.00]` See https://greweb.me/2012/02/bezier-curve-based-easing-functions-from-concept-to-implementation Keep in mind this will also be affected by the lerp unless you set `disableLerp` to `true`. `disableLerp` (boolean) : Lerp effect won't be applied if set to `true`

Instance events

Event	Arguments	Description
`scroll`	`obj`	Returns scroll instance (position, limit, speed, direction and current in-view elements).
`call`	`func`	Trigger if in-view. Returns your `string` or `array` if contains `,`.

Progressive playing animations example (like gsap)

All data-scroll elements have a progress value. In the on scroll event you can get all current in-view elements.

HTML

<h1 data-scroll data-scroll-id="hey">Hey</h1>

JS

scroll.on('scroll', (args) => {
    // Get all current elements : args.currentElements
    if(typeof args.currentElements['hey'] === 'object') {
        let progress = args.currentElements['hey'].progress;
        console.log(progress);
        // ouput log example: 0.34
        // gsap example : myGsapAnimation.progress(progress);
    }
});

Dependencies

Name	Description
Virtual Scroll	Custom scroll event with inertia/momentum.
modularScroll	Elements in viewport detection. Forked from it, not a dependency.
bezier-easing	Allows to define an easing to `scrollTo` movement

Browser support

Works on most modern browsers. Chrome, Firefox, Safari, Edge...

To get IE 11 support, you need polyfills. You can use your own or include these before our script.

<script nomodule src="https://cdnjs.cloudflare.com/ajax/libs/babel-polyfill/7.6.0/polyfill.min.js" crossorigin="anonymous"></script>
<script nomodule src="https://polyfill.io/v3/polyfill.min.js?features=Object.assign%2CElement.prototype.append%2CNodeList.prototype.forEach%2CCustomEvent%2Csmoothscroll" crossorigin="anonymous"></script>

Who's using Locomotive Scroll?

Locomotive Boilerplate 🚂

mehedidb/locomotive-scroll

Locomotive Scroll

Installation

Usage

Basic

HTML

CSS

JS

With a bundler

Or without

Smooth

Advanced

With methods

With events

Instance options

Element attributes

Instance methods

Instance events

Progressive playing animations example (like gsap)

HTML

JS

Dependencies

Browser support

Who's using Locomotive Scroll?

Related