use-count-up

useCountUp React hook

Only 4.6kB min / 1.5kB min+gzip React hook to animate counting up or down to a number, infinity, or even beyond.

Display your data in an attractive way to make sure the important numbers are highlighted in an eye-catching format.

Unlike other similar solutions, this hook allows you to count up/down with or without providing end values.

Installation

yarn add use-count-up

or

npm install use-count-up

Demo

Check the demo on CodeSandbox to get started

Basic usage

import { useCountUp } from 'use-count-up';

const isCounting = true;
const config = {
  start: 450,
  end: 1320,
  duration: 3.2,
  formatter: value => `${Math.ceil(value)}$`
};

const MyComponent = () => { 
  const value = useCountUp(isCounting, config);
  return value;
};

Function signature

The function takes two agruments and returns the value from the formatter method.

  const useCountUp = (
    isCounting: boolean,
    config?: {
      start?: number,
      end?: number,
      duration?: number,
      onComplete?: () => void,
      easing?: (t: number, b: number, c: number, d: number) => number,
      formatter?: (value: number) => number|string|node,
    }
  ) => number|string|node;

1st agrument isCounting: boolean

Default: isCounting = false

Toggle the counting animation. It can be used to start the animation when the elmenet enters the viewport. If config.end is not provided, the animation will continue to Infinity.

2nd argument config: object

Default: config = {}

Optional configuration object with the following properties and methods:

start: number

Default: start = 0

Initial value.

end: number

Default: end = undefined

Target value.

duration: number

Default: duration = undefined

Animation duration in seconds. Example: 3, 4.2, 0.5

onComplete: () => void

Default: onComplete = undefined

On animation complete event handler.

easing: (t: number, b: number, c: number, d: number) => number,

Default: easing = (t, b, c, d) => { t /= d; t--; return c*(t*t*t*t*t + 1) + b; } // easeOutQuint

t - current time
b - start value
c - change in value
d - duration
Easing function to control how the animation is progressing. There are a bunch of functions that can be used to change that behaviour.

formatter: (value: number) => number|string|node

Default: formatter = value => Math.round(value)

A function that formats the output value. It can be used to add prefix or suffix to the value. A good formatting option is to use toLocaleString, which will give the correct decimal and thousand separators.

Changelog

1.0.1 (Nov 13th, 2019)

Minor changes:

• Update .gitignore, .npmignore and Readme