react-timing-hooks

react-timing-hooks

This library contains (or will contain) a bunch of hooks that can be used to trigger effects containing timeouts, intervals etc. without having to worry about storing "timeoutIds" or proper clean up of leaking timers. Apart from that this lib is super light-weight, since it doesn't include any other dependencies.

This package is still in alpha. It is not yet feature complete.

TL;DR

• less boilerplate to write
• simple API
• super leight-weight

Table of Contents

• Docs and examples
  • useTimeout
  • useTimeoutEffect
  • useInterval
  • useIdleCallback
  • useIdleCallbackEffect
• Why bother?

Documentation

Note: A hook for requestAnimationFrame and an interval-versions of requestIdleCallback is still in development

useTimeout(callback, timeout)

• callback - a function that will be invoked as soon as the timeout expires

• timeout - the timeout in milliseconds

Example:

// Hide something after 2 seconds
const hideDelayed = useTimeout(() => setHide(true), 2000)

return <button onClick={hideDelayed}>Hide!</button>

useTimeoutEffect(effectCallback, deps)

• effectCallback - will receive one argument timeout(f, timeout) that has the same signature as a native setTimeout

• deps - is your regular useEffect dependency array

Example:

// Delay the transition of a color by one second everytime it changes
useTimeoutEffect(timeout => {
  if (color) {
    timeout(() => transitionTo(color), 1000)
  }
}, [color])

useInterval(intervalCallback, delay)

• intervalCallback - will be run every [delay] (second arg) seconds

• delay - is the delay at which the callback will be run. If delay is null the interval will be suspended.

Example:

// Increase count every 200 milliseconds
const [count, setCount] = useState(0)
useInterval(() => setCount(count + 1), 200)

useIdleCallback(callback, options)

• callback - a function that will be invoked as soon as the browser decides to run the idle callback

• options - options for requestIdleCallback

Example:

// Track button click when idle
const trackClickWhenIdle = useIdleCallback(trackClick)

return <button onClick={trackClickWhenIdle}>Track me!</button>

useIdleCallbackEffect(effectCallback, deps)

• effectCallback - will receive one argument requestIdleCallback(f, opts) that has the same signature as the native requestIdleCallback

• deps - is your regular useEffect dependency array

Note: This hook will print a warning if the browser doesn't support requestIdleCallback.

Example:

// Track page view when browser is idle
useIdleCallbackEffect(onIdle => {
  if (page) {
    onIdle(() => trackPageView(page))
  }
}, [page])

Why bother?

Writing a timeout or anything similar requires a lot of boilerplate (if you don't do it quick and dirty). This library is supposed to give you easy access to those functionalities while keeping your code clean.

For example: You might have a timeout that runs under a certain condition. In this case a cleanup has to be done in a separate useEffect call that cleans everything up (but only on unmount).

Your code could look like this:

  import { useEffect } from 'react'

  // ... 

  const timeoutId = useRef(null)

  useEffect(() => {
    if (depA && depB) {
      timeoutId.current = setTimeout(() => doSomething(), 1000)
    }
  }, [depA, depB])

  useEffect(() => {
    return function onUnmount() {
      if (timeoutId.current !== null) {
        clearTimeout(timeoutId.current)
      }
    }
  }, [timeoutId])

With react-timing-hooks you can just write:

  import { useTimeoutEffect } from 'react-timing-hooks'

  // ... 
  useEffect((timeout) => {
    if (depA && depB) {
      timeout(() => doSomething(), 1000)
    }
  }, [depA, depB])

In this case react-timing-hooks automatically took care of cleaning up the timeout for you (if the component is mounted for less than a second for instance).