useeffect on update
const isInitialMount = useRef(true);
useEffect(() => {
if (isInitialMount.current) {
isInitialMount.current = false;
} else {
// Your useEffect code here to be run on update
}
});useeffect on update
const isInitialMount = useRef(true);
useEffect(() => {
if (isInitialMount.current) {
isInitialMount.current = false;
} else {
// Your useEffect code here to be run on update
}
});passing event handler to useEffeect
const App =() => {
const [userText, setUserText] = useState("");
useEffect(() => {
const handleUserKeyPress = event => {
const { key, keyCode } = event;
if (keyCode === 32 || (keyCode >= 65 && keyCode <= 90)) {
setUserText(`${userText}${key}`);
}
};
window.addEventListener("keydown", handleUserKeyPress);
return () => {
window.removeEventListener("keydown", handleUserKeyPress);
};
}, [userText]); // ESLint will yell here, if `userText` is missing
return (
<div>
<h1>Feel free to type!</h1>
<blockquote>{userText}</blockquote>
</div>
);
}
ReactDOM.render(<App />, document.getElementById("root"));Copyright © 2021 Codeinu
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