soft-scroll

Online demo!

Introduction

soft-scroll is a small library for animating scrollable viewports using CSS.

Installation

npm install soft-scroll

Alternatively, just download and include soft-scroll.js

<script src="soft-scroll.js"></script>

Prerequisites

soft-scroll needs a wrapper element within the scrollable container to work:

container
└── wrapper
    ├── element 1
    ├── element 2
    ├── element 3
    └── ..element n

Usage

function softScroll(
  duration: number | ((distance: number) => number),
  element?: Node | Event
): void { }

soft-scroll requires the animation duration and element to be scrolled into view:

softScroll(500, document.getElementById('target'));

Advanced usage

Currying

The target element may be omitted, in which case soft-scroll will return a function that accepts it:

const quickScroll = softScroll(500);

quickScroll(document.getElementById('target'));

This is especially is useful for binding event listeners:

document
  .getElementById('target')
  .addEventListener('click', softScroll(500));

In the case where an event is passed in as the second argument, soft-scroll will detect and use the target property.

Relative duration

If the duration is a function, soft-scroll will call it and use the result. This function will receive the distance the container would travel as its first and only argument.

This is useful for making the container move at constant speed regardless of the distance traveled

const double = num => num * 2;

softScroll(double, document.getElementById('target'));

Limitations

soft-scroll currently only works with horizontal scrolling.

License

MIT