smooth-scrolling
Smooth is a small JavaScript module based on VirtualScroll to create smooth scrolling and parallax effects on scroll.
Last updated 2 years ago by bbriel .
MIT · Original npm · Tarball · package.json
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smooth

Smooth is a small JavaScript module based on VirtualScroll to create smooth scrolling and parallax effects on scroll. It works both with fake scrollbars and native scrolling.

Usage

npm install smooth-scrolling

import Smooth from 'smooth-scrolling'

const section = document.querySelector('.vs-section')
const smooth = new Smooth({
  native: true,
  section: section,
  ease: 0.1
})

smooth.init()

Options

  • listener: on-scroll events listener & parent container for all elements
  • direction : vertical or horizontal scrolling behavior
  • native: use the default scrollbar
  • section : the element to transform
  • ease : the easing value (usually between 0 and 1)
  • vs : you can pass some option for virtuall-scroll: limitInertia, mouseMultiplier, etc
  • preload : if set to false, there will be no resize function called after all images loaded
  • noscrollbar : if using virtual-scroll and set to true, it will not build a custom scrollbar
  • callback: function called on requestAnimationFrame

Methods

smooth.init()

Will add all event listeners and DOM elements.

smooth.on()

Will listen to either window scroll event (if native), otherwise VirtualScroll

smooth.off()

Will stop listening to onscroll/wheel events.

smooth.destroy()

Will remove all event listeners and DOM elements.

smooth.scrollTo(offset)

Basic scrollTo function.

Extends Smooth

import Smooth from 'smooth-scrolling'

class Custom extends Smooth {
  
  constructor(opt = {}) {
    super(opt)
    this.dom.section = opt.section
    this.dom.opacity = opt.opacity
  }
  
  run() {
    super.run()
    
    const current = Math.round(Math.abs(this.vars.current))
    const opacity = Math.max(0, Math.min(1 - current / (this.vars.height * .5), 1))
    
    this.dom.opacity.style.opacity = opacity.toFixed(2)
    this.dom.section.style[this.prefix] = this.getTransform(-this.vars.current.toFixed(2))
  }

  resize() {
    this.vars.bounding = this.dom.section.getBoundingClientRect().height - this.vars.height
    super.resize()
  }
}

export default Custom
// ...and later on
import Custom from './custom-smooth-scrolling'

const section = document.querySelector('.vs-section')
const opacity = document.querySelector('.vs-opacity')

const smooth = new Custom({
  section: section,
  opacity: opacity,
  ease: 0.1
})

smooth.init()

Development

git clone git@github.com:baptistebriel/smooth-scrolling.git

cd smooth-scrolling/ && npm i && npm run dev

You can use [http-server](https://www.npmjs.com/package/http-server) or MAMP to preview the demos.

Demos

npm run demo-parallax

npm run demo-parallax-page

npm run demo-horizontal

npm run demo-native-horizontal

npm run demo-opacity

npm run demo-scale

npm run demo-split

npm run demo-performances

Examples

Further understanding

If you didn't already read the tutorial, I highly recommend it. Smooth.js is basically what's explained on the blog post. I just needed a simple script to get things done without having to write lots of code every time I wanted to use this technique.

License

MIT, see LICENSE.md.

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