use-event-listener

A React hook which provides a simple and declarative way to add DOM event listeners with automatic cleanup.

Features

• Auto cleanup: Automatic cleanup of events on unmount and dependency change
• Reactive: Potentially re-attaches listeners on dependency change(target, event, options)
• Conditional event: Conditional event support with feature flag. And listeners only get attached when:- target exists, handler is provided, and shouldInjectEvent is true
• Standard options: Full support for all AddEventListenerOptions (capture, once, passive, signal)

Problem It Solves

Boilerplate Reduction

• Problem: Manually managing event listeners in React components leads to verbose, repetitive and error-prone code with potential memory leaks.

// ❌ Problematic approach which is redundant and verbose
function Component() {
   const [scrollY, setScrollY] = useState(0)

   useEffect(() => {
      const handleScroll = () => {
         setScrollY(window.scrollY)
      }

      window.addEventListener('scroll', handleScroll)
      return () => window.removeEventListener('scroll', handleScroll) // Doing proper cleanup on unmount
   }, [])

   return <div>Current: {scrollY}</div>
}

Solution:

• Eliminates repetitive addEventListener/removeEventListener code

• Reduces component complexity by abstracting event handling logic

• Automatic cleanup ensures listeners are removed when:-

  -> Component unmounts

  -> Target element changes

  -> Event type changes

  -> Any of Options params:- shouldInjectEvent, capture, once, passive, signal gets changed

// ✅ Clean, declarative approach
function Component() {
   const [scrollY, setScrollY] = useState(0)
   const breakpoint = useEventListener({
      target: () => window,
      event: 'scroll',
      handler: () => {
         setScrollY(window.scrollY)
      },
   })

   return <div>Current: {scrollY}</div>
}

Performance Benefits

• Stable references accross re-renders which prevents listeners from being repeatedly added/removed

• Efficient dependency tracking

Parameters

Parameter	Type	Required	Default Value	Description
target	EvTarget	✅	-	Target element on which the event is listened to.
event	string	✅	-	Event name (e.g. 'click', 'keydown')
handler	EvHandler	❌	undefined	Event listener callback function
options	EvOptions	❌	undefined	Event listener options and feature flags

Options Parameter

The options parameter accepts an object that extends the standard AddEventListenerOptions with an additional custom property for conditional event handling.

Standard AddEventListenerOptions

Property	Type	Default	Description
capture	boolean	false	If true, the listener will be triggered during the capture phase
once	boolean	false	If true, the listener will be automatically removed after being triggered once
passive	boolean	false	If true, indicates that the function will never call preventDefault()
signal	AbortSignal	undefined	An AbortSignal that can be used to remove the event listener

Custom Options

Property	Type	Default	Description
shouldInjectEvent	boolean | any	true	Controls whether the event listener should be attached. When false, the event listener is not added

Type Definitions

Details

export type EvTarget = () => EventTarget | null
export type EvHandler = (event: Event) => void

export interface EvOptions extends AddEventListenerOptions {
   // Standard AddEventListenerOptions:
   capture?: boolean
   once?: boolean
   passive?: boolean
   signal?: AbortSignal

   // Custom option:
   shouldInjectEvent?: boolean | any // Controls whether the event should be attached
}

Return Value(s)

This hook does not return anything.

Common Use Cases

• Adding dom events (e.g 'click', 'keydown', 'resize', 'scroll')

Usage Examples

Basic Click Handler

import { useRef } from 'react'
import { useEventListener } from 'classic-react-hooks'

export default function ClickExample() {
   const buttonRef = useRef<HTMLButtonElement>(null)

   useEventListener({
      target: () => buttonRef.current,
      event: 'click',
      handler: (e) => {
         console.log('Button clicked!', e)
      },
   })

   return <button ref={buttonRef}>Click me</button>
}

Listening Window Event

Example

import { useEventListener } from 'classic-react-hooks'

export default function WindowExample() {
   useEventListener({
      target: () => window,
      event: 'resize',
      handler: (e) => {
         console.log('Window resized:', window.innerWidth, window.innerHeight)
      },
   })

   return <div>Resize the window and check console</div>
}

Conditional Event Listening

Example

import { useState } from 'react'
import { useEventListener } from 'classic-react-hooks'

export default function ConditionalExample() {
   const [isListening, setIsListening] = useState(true) 

   useEventListener({
      target: () => document,
      event: 'keydown',
      handler: (e) => {
         console.log('Key pressed:', e.key)
      },
      options: {
         shouldInjectEvent: isListening, // Only listen when enabled
      },
   })

   return (
      <div>
         <button onClick={() => setIsListening(!isListening)}>{isListening ? 'Stop' : 'Start'} Listening</button>
         <p>Press any key (when listening is enabled)</p>
      </div>
   )
}