Butter Scroll

Simple, effective, progressively-enhanced, buttery-smooth scrolling.

Warning

This project is still in its very early stages. If you're not willing to read the source or come up with clever workarounds for bizarre behavior, it's probably not for you.

Installation

via npm

npm install butter-scroll --save

Other required libraries

The long-term goal is to remove these dependencies, but for now Butter Scroll won't work if they aren't loaded.

• jQuery

Other optional (but recommended) libraries

If a Modernizr build with the correct options is available, Butter Scroll will use that to progressively enhance for browsers that fully support it, and retain normal scrolling for those that don't.

If Modernizr is not found, Butter Scroll will assume full browser support.

Your Modernizr build should include the following:

• csstransforms
• csstransforms3d
• Modernizr.prefixed()

Or just use this Modernizr build

Setup

HTML

The class names used here don't need to match exactly this example, but they do need to exactly match the names used in your styles and initialization javascript.

<div class="outer-container js-outer-container">
  <div class="inner-container js-inner-container">
    …
  </div>
</div>

Optional Parallax

To enable parallax for individual HTML elements, just give them a data-depth attribute with a value between 0 (farthest away) and 10 closest.

<div data-depth="3"></div>
<div data-depth="7"></div>

Styles

There are a few minimal CSS styles that you need to add to the above elements.

.inner-container {
  overflow: hidden;
}

Javascript

new ButterScroll({
  $containerEl: $('.js-outer-container'),
  $elToScroll: $('.js-inner-container'),
  scrollEase: 0.15, // optional
  maxDepthOffset: 500 // optional
});

Dev

npm start: Automatically builds on file change and starts a live reload server with an example at http://localhost:3000/example/

npm run build: Builds production-ready files