@johnrom/react-countup

React CountUp

A configurable React component wrapper around CountUp.js.

Click here to view on CodeSandbox.

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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 = () => {
  useCountUp({ ref: "counter", end: 1234567 });
  return <span id="counter"/>;
};

Complete example

import { useCountUp } from 'react-countup';

const CompleteHook = () => {
  const countUpRef = React.useRef(null);
  const { start, pauseResume, reset, update } = useCountUp({
    ref: countUpRef,
    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 ref={countUpRef}/>
      <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

Trigger of transition

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.

Run if in focus

You need to check if your counter in viewport, react-visibility-sensor can be used for this purpose.

import React from "react";
import CountUp from "react-countup";
import VisibilitySensor from "react-visibility-sensor";
import "./styles.css";

export default function App() {
  return (
    <div className="App">
      <h1>Hello CodeSandbox</h1>
      <div className="content" />
      <VisibilitySensor partialVisibility offset={{ bottom: 200 }}>
        {({ isVisible }) => (
          <div style={{ height: 100 }}>
            {isVisible ? <CountUp end={1000} /> : null}
          </div>
        )}
      </VisibilitySensor>
    </div>
  );
}

License

MIT