use-elapsed-time

useElapsedTime React hook

The only hook you need to perform JavaScript animations in React.

• Toggle play/pause
• Combine with any easing function to get the right animation
• Built-in and ready-to-use TypeScript type definitions.

Installation

yarn add use-elapsed-time

or

npm install use-elapsed-time

Basic usage

import { useElapsedTime } from 'use-elapsed-time';

const MyComponent = () => {
  const isPlaying = true;
  const elapsedTime = useElapsedTime(isPlaying);
  
  return elapsedTime;
};

Basic usage demo

Function signature

  function useElapsedTime(
    isPlaying: boolean,
    config?: {
      startAt: number,
      durationMilliseconds: number,
      onComplete?: () => undefined | [shouldRepeat: boolean, delay: number]
    }
  ): number;

The first argument isPlaying indicates if the loop to get the elapsed time is running or it is paused. The second argument config is optional. durationMilliseconds option set the animation duration in milliseconds. onComplete callback will be fired when the duration is reached. onComplete can be used to restart the elapsed time loop by returning an array where the first element shouldRepeat indicates if the loop should start over and second element delay specifies the delay before looping again in milliseconds. startAt option can shift the start time to a different value than 0. { durationMilliseconds: 5000, startAt: 2000 } will return the elapsed time from 2000 to 5000 milliseconds.

The hook returns elapsed time in milliseconds.

Use cases

Countdown timer

Count up animation

Non-liner path animation

Changelog

1.1.5 (December 22nd, 2019)

Implemented enhancements:

• Refactor internals
• Add test coverage