glennreyes/react-countup

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💫 A configurable React component wrapper around CountUp.js

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Artefatosnpmnpm install react-countup

README

React CountUp

A configurable React component wrapper around CountUp.js.

Click here to view on CodeSandbox.

Previous docs

react-countup

Installation

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

`plugin: CountUpPlugin`

Define plugin for alternate animations

`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

`useGrouping: boolean`

Enables grouping with separator.

Default: true

`useIndianSeparators: boolean`

Enables grouping using indian separation, f.e. 1,00,000 vs 100,000

Default: false

`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.

To prevent component from unnecessary updates this function should be memoized with useCallback

`enableScrollSpy: boolean`

Enables start animation when target is in view.

`scrollSpyDelay: number`

Delay (ms) after target comes into view

`scrollSpyOnce: boolean`

Run scroll spy only once

`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">
      <div className="content" />
      <VisibilitySensor partialVisibility offset={{ bottom: 200 }}>
        {({ isVisible }) => (
          <div style={{ height: 100 }}>
            {isVisible ? <CountUp end={1000} /> : null}
          </div>
        )}
      </VisibilitySensor>
    </div>
  );
}

Note: For latest react-countup releases there are new options enableScrollSpy and scrollSpyDelay which enable scroll spy, so that as user scrolls to the target element, it begins counting animation automatically once it has scrolled into view.

import './styles.css';
import CountUp, { useCountUp } from 'react-countup';

export default function App() {
  useCountUp({
    ref: 'counter',
    end: 1234567,
    enableScrollSpy: true,
    scrollSpyDelay: 1000,
  });

  return (
    <div className="App">
      <div className="content" />
      <CountUp end={100} enableScrollSpy />
      <br />
      <span id="counter" />
    </div>
  );
}

Set accessibility properties for occupation period

You can use callback properties to control accessibility:

import React from 'react';
import CountUp, { useCountUp } from 'react-countup';

export default function App() {
  useCountUp({ ref: 'counter', end: 10, duration: 2 });
  const [loading, setLoading] = React.useState(false);

  const onStart = () => {
    setLoading(true);
  };

  const onEnd = () => {
    setLoading(false);
  };

  const containerProps = {
    'aria-busy': loading,
  };

  return (
    <>
      <CountUp
        end={123457}
        duration="3"
        onStart={onStart}
        onEnd={onEnd}
        containerProps={containerProps}
      />
      <div id="counter" aria-busy={loading} />
    </>
  );
}

Plugin usage

import { CountUp } from 'countup.js';
import { Odometer } from 'odometer_countup';

export default function App() {
  useCountUp({
    ref: 'counter',
    end: 1234567,
    enableScrollSpy: true,
    scrollSpyDelay: 1000,
    plugin: Odometer,
  });

  return (
    <div className="App">
      <span id="counter" />
    </div>
  );
}