React CountUp

A configurable React component wrapper around CountUp.js.

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Table of Contents

• Installation
  • Usage
    • Simple example
    • Render prop example
    • More examples
      • Manually start with render prop
      • Autostart with render prop
      • Delay start
      • Hook
  • API
    • Props
      • className: string
      • decimal: string
      • decimals: number
      • delay: ?number
      • duration: number
      • end: number
      • prefix: string
      • redraw: boolean
      • preserveValue: boolean
      • separator: string
      • start: number
      • startOnMount: boolean
      • suffix: string
      • useEasing: boolean
      • easingFn: (t: number, b: number, c: number, d: number) => number
      • formattingFn: (value: number) => string
      • onEnd: ({ pauseResume, reset, start, update }) => void
      • onStart: ({ pauseResume, reset, update }) => void
      • onPauseResume: ({ reset, start, update }) => void
      • onReset: ({ pauseResume, start, update }) => void
      • onUpdate: ({ pauseResume, reset, start }) => void
    • Render props
      • countUpRef: () => void
      • pauseResume: () => void
      • reset: () => void
      • start: () => void
      • update: (newEnd: number?) => void
  • Protips
  • License

Installation

yarn add react-countup

Usage

import CountUp from 'react-countup';

Simple example

<CountUp end={100} />

This will start a count up transition from 0 to 100 on render.

Render prop example

<CountUp
  start={-875.039}
  end={160527.012}
  duration={2.75}
  separator=" "
  decimals={4}
  decimal=","
  prefix="EUR "
  suffix=" left"
  onEnd={() => console.log('Ended! 👏')}
  onStart={() => console.log('Started! 💨')}
>
  {({ countUpRef, start }) => (
    <div>
      <span ref={countUpRef} />
      <button onClick={start}>Start</button>
    </div>
  )}
</CountUp>

The transition won't start on initial render as it needs to be triggered manually here.

Tip: If you need to start the render prop component immediately, you can set delay={0}.

More examples

Manually start with render prop

<CountUp start={0} end={100}>
  {({ countUpRef, start }) => (
    <div>
      <span ref={countUpRef} />
      <button onClick={start}>Start</button>
    </div>
  )}
</CountUp>

Autostart with render prop

Render start value but start transition on first render:

<CountUp start={0} end={100} delay={0}>
  {({ countUpRef }) => (
    <div>
      <span ref={countUpRef} />
    </div>
  )}
</CountUp>

Note that delay={0} will automatically start the count up.

Delay start

<CountUp delay={2} end={100} />

Hook

Simple example

import { useCountUp } from 'react-countup';

const SimpleHook = () => {
  const { countUp } = useCountUp({ end: 1234567 });
  return <div>{countUp}</div>;
};

Complete example

import { useCountUp } from 'react-countup';

const CompleteHook = () => {
  const { countUp, start, pauseResume, reset, update } = useCountUp({
    start: 0,
    end: 1234567,
    delay: 1000,
    duration: 5,
    onReset: () => console.log('Resetted!'),
    onUpdate: () => console.log('Updated!'),
    onPauseResume: () => console.log('Paused or resumed!'),
    onStart: ({ pauseResume }) => console.log(pauseResume),
    onEnd: ({ pauseResume }) => console.log(pauseResume),
  });
  return (
    <div>
      <div>{countUp}</div>
      <button onClick={start}>Start</button>
      <button onClick={reset}>Reset</button>
      <button onClick={pauseResume}>Pause/Resume</button>
      <button onClick={() => update(2000)}>Update to 2000</button>
    </div>
  );
};

API

Props

className: string

CSS class name of the span element.

Note: This won't be applied when using CountUp with render props.

decimal: string

Specifies decimal character.

Default: .

decimals: number

Amount of decimals to display.

Default: 0

delay: ?number

Delay in seconds before starting the transition.

Default: null

Note: delay={0} will automatically start the count up.

duration: number

Duration in seconds.

Default: 2

end: number

Target value.

prefix: string

Static text before the transitioning value.

redraw: boolean

Forces count up transition on every component update.

Default: false

preserveValue: boolean

Save previously ended number to start every new animation from it.

Default: false

separator: string

Specifies character of thousands separator.

start: number

Initial value.

Default: 0

startOnMount: boolean

Use for start counter on mount for hook usage.

Default: true

suffix: string

Static text after the transitioning value.

useEasing: boolean

Enables easing. Set to false for a linear transition.

Default: true

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

Easing function. Click here for more details.

Default: easeInExpo

formattingFn: (value: number) => string

Function to customize the formatting of the number

onEnd: ({ pauseResume, reset, start, update }) => void

Callback function on transition end.

onStart: ({ pauseResume, reset, update }) => void

Callback function on transition start.

onPauseResume: ({ reset, start, update }) => void

Callback function on pause or resume.

onReset: ({ pauseResume, start, update }) => void

Callback function on reset.

onUpdate: ({ pauseResume, reset, start }) => void

Callback function on update.

Render props

countUpRef: () => void

Ref to hook the countUp instance to

pauseResume: () => void

Pauses or resumes the transition

reset: () => void

Resets to initial value

start: () => void

Starts or restarts the transition

update: (newEnd: number?) => void

Updates transition to the new end value (if given)

Protips

By default, the animation is triggered if any of the following props has changed:

• duration
• end
• start

If redraw is set to true your component will start the transition on every component update.

License

MIT