Created
September 2, 2020 02:58
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custom addEventListener hook with typescript
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import React, { useEffect, useRef, useState } from 'react'; | |
import logo from './logo.svg'; | |
import './App.css'; | |
interface Options { | |
enable?: boolean; | |
target?: GlobalEventHandlers; | |
} | |
const useEventListener = ( | |
targetEvent: keyof GlobalEventHandlersEventMap, | |
handler: (e: Event) => void, | |
{ enable = true, target = document }: Options = {} | |
) => { | |
const handlerRef = useRef(handler); | |
const internalHandler = (e: Event) => { | |
handlerRef.current(e); | |
}; | |
useEffect(() => { | |
handlerRef.current = handler; | |
}); | |
useEffect(() => { | |
if (!enable) { | |
console.log('enable in'); | |
return; | |
} | |
target.addEventListener(targetEvent, internalHandler); | |
return () => { | |
target.removeEventListener(targetEvent, internalHandler); | |
}; | |
}, [targetEvent, enable, target]); | |
}; | |
function App() { | |
const [enable, setEnable] = useState(false); | |
const [count, setCount] = useState(0); | |
useEventListener( | |
'click', | |
() => { | |
console.log('object', count); | |
}, | |
{ enable } | |
); | |
useEventListener( | |
'scroll', | |
() => { | |
console.log('SCROLLLLL'); | |
}, | |
{ target: window } | |
); | |
return ( | |
<div className="App" style={{ height: '2000px' }}> | |
<header className="App-header"> | |
<img src={logo} className="App-logo" alt="logo" /> | |
<p> | |
Edit <code>src/App.js</code> and save to reload. | |
</p> | |
<a className="App-link" href="#" target="_blank" rel="noopener noreferrer"> | |
{count} | |
</a> | |
<button onClick={() => setEnable(!enable)}>Enable: {enable.toString()}</button> | |
<button onClick={() => setCount(count + 1)}>click</button> | |
</header> | |
</div> | |
); | |
} | |
export default App; |
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