React Random Reveal

React component/hook to add a little thrill before revealing the truth. This effect is achieved via a character animation that shows random characters before revealing the text you want to emphasize. The library provides full control over the reveal run: its duration and easing can be freely adjusted.

• Animate random letters, numbers, emojis, words or components
• Performance optimized with single requestAnimationFrame loop to animate the random characters (no setInterval used)
• Built with TypeScript

Installation

yarn add react-random-reveal

Demos

Text Demo	Emoji Demo	Words Demo

Basic usage

As a component:

import { RandomReveal } from 'react-random-reveal'

const AddSuspenseComponent = () => (
  <RandomReveal isPlaying duration={2} characters="hello world" />
)

As a hook:

import { useRandomReveal } from 'react-random-reveal'

const AddSuspenseComponent = () => {
  const characters = useRandomReveal({
    isPlaying: true,
    duration: 2,
    characters: 'hello world',
  })

  return characters
}

Props

Prop Name	Type	Default	Description
isPlaying	boolean	required	Play and pause animation.
characters	string | ReactNode[]	required	Characters to reveal in the end of the duration. These could be letters, numbers, emojis, words or components
duration	number	required	Total animation duration in seconds. The duration includes the overall time random characters are shown plus the time for revealing the characters
updateInterval	number	0.065	Update interval in seconds. Determines how often the characters will change. When set to 0 the value will update on each key frame
revealDuration	number	0.6	The duration to reveal all characters is represented as a fraction of the total duration. This is a number between 0 and 1. When set to 0, all characters will be revealed in the end of the duration at once. When set to 1, characters will start revealing from the beginning of the duration
revealEasing	'linear' | 'easeInQuad' | 'easeOutQuad' | 'random'	linear	The easing function used to reveal characters during the reveal duration
characterSet	ReactNode[]	English alphabet: ['a', 'b', 'c', ... 'z']	Characters that will be used during the random characters run
ignoreCharacterSet	string[]	-	Characters that won't be animated and will always be revealed. Can be used to ignore animating space or any special characters.
onComplete	() => void | { shouldRepeat: boolean, delay: number }	-	The callback is fired when the duration is reached. It can be used to restart the animation by returning an object with the following params: shouldRepeat - indicates if the loop should start over; delay - delay before looping again in seconds

Browser support

We support all modern browsers targeting es6. Internet Explorer (IE) is not longer supported.