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I don't understand why is when I use setTimeout
function my react component start to infinite console.log. Everything is working, but PC start to lag as hell.
Some people saying that function in timeout changing my state and that rerender component, that sets new timer and so on. Now I need to understand how to clear it's right.
export default function Loading() {
// if data fetching is slow, after 1 sec i will show some loading animation
const [showLoading, setShowLoading] = useState(true)
let timer1 = setTimeout(() => setShowLoading(true), 1000)
console.log('this message will render every second')
return 1
}
Clear in different version of code not helping to:
const [showLoading, setShowLoading] = useState(true)
let timer1 = setTimeout(() => setShowLoading(true), 1000)
useEffect(
() => {
return () => {
clearTimeout(timer1)
}
},
[showLoading]
)
I don't understand why is when I use setTimeout
function my react component start to infinite console.log. Everything is working, but PC start to lag as hell.
Some people saying that function in timeout changing my state and that rerender component, that sets new timer and so on. Now I need to understand how to clear it's right.
export default function Loading() {
// if data fetching is slow, after 1 sec i will show some loading animation
const [showLoading, setShowLoading] = useState(true)
let timer1 = setTimeout(() => setShowLoading(true), 1000)
console.log('this message will render every second')
return 1
}
Clear in different version of code not helping to:
const [showLoading, setShowLoading] = useState(true)
let timer1 = setTimeout(() => setShowLoading(true), 1000)
useEffect(
() => {
return () => {
clearTimeout(timer1)
}
},
[showLoading]
)
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edited Jun 7, 2019 at 8:46
ZiiMakc
asked Oct 31, 2018 at 19:09
ZiiMakcZiiMakc
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11 Answers
Reset to default 406Defined return () => { /*code/* }
function inside useEffect
runs every time useEffect
runs (except first render on component mount) and on component unmount (if you don't display component any more).
This is a working way to use and clear timeouts or intervals:
Sandbox example.
import { useState, useEffect } from "react";
const delay = 5;
export default function App() {
const [show, setShow] = useState(false);
useEffect(
() => {
let timer1 = setTimeout(() => setShow(true), delay * 1000);
// this will clear Timeout
// when component unmount like in willComponentUnmount
// and show will not change to true
return () => {
clearTimeout(timer1);
};
},
// useEffect will run only one time with empty []
// if you pass a value to array,
// like this - [data]
// than clearTimeout will run every time
// this value changes (useEffect re-run)
[]
);
return show ? (
<div>show is true, {delay}seconds passed</div>
) : (
<div>show is false, wait {delay}seconds</div>
);
}
If you need to clear timeouts or intervals in another component:
Sandbox example.
import { useState, useEffect, useRef } from "react";
const delay = 1;
export default function App() {
const [counter, setCounter] = useState(0);
const timer = useRef(null); // we can save timer in useRef and pass it to child
useEffect(() => {
// useRef value stored in .current property
timer.current = setInterval(() => setCounter((v) => v + 1), delay * 1000);
// clear on component unmount
return () => {
clearInterval(timer.current);
};
}, []);
return (
<div>
<div>Interval is working, counter is: {counter}</div>
<Child counter={counter} currentTimer={timer.current} />
</div>
);
}
function Child({ counter, currentTimer }) {
// this will clearInterval in parent component after counter gets to 5
useEffect(() => {
if (counter < 5) return;
clearInterval(currentTimer);
}, [counter, currentTimer]);
return null;
}
Article from Dan Abramov.
The problem is you are calling setTimeout
outside useEffect
, so you are setting a new timeout every time the component is rendered, which will eventually be invoked again and change the state, forcing the component to re-render again, which will set a new timeout, which...
So, as you have already found out, the way to use setTimeout
or setInterval
with hooks is to wrap them in useEffect
, like so:
React.useEffect(() => {
const timeoutID = window.setTimeout(() => {
...
}, 1000);
return () => window.clearTimeout(timeoutID );
}, []);
As deps = []
, useEffect
's callback will only be called once. Then, the callback you return will be called when the component is unmounted.
Anyway, I would encourage you to create your own useTimeout
hook so that you can DRY and simplify your code by using setTimeout
declaratively, as Dan Abramov suggests for setInterval
in Making setInterval Declarative with React Hooks, which is quite similar:
function useTimeout(callback, delay) {
const timeoutRef = React.useRef();
const callbackRef = React.useRef(callback);
// Remember the latest callback:
//
// Without this, if you change the callback, when setTimeout kicks in, it
// will still call your old callback.
//
// If you add `callback` to useEffect's deps, it will work fine but the
// timeout will be reset.
React.useEffect(() => {
callbackRef.current = callback;
}, [callback]);
// Set up the timeout:
React.useEffect(() => {
if (typeof delay === 'number') {
timeoutRef.current = window.setTimeout(() => callbackRef.current(), delay);
// Clear timeout if the components is unmounted or the delay changes:
return () => window.clearTimeout(timeoutRef.current);
}
}, [delay]);
// In case you want to manually clear the timeout from the consuming component...:
return timeoutRef;
}
const App = () => {
const [isLoading, setLoading] = React.useState(true);
const [showLoader, setShowLoader] = React.useState(false);
// Simulate loading some data:
const fakeNetworkRequest = React.useCallback(() => {
setLoading(true);
setShowLoader(false);
// 50% of the time it will display the loder, and 50% of the time it won't:
window.setTimeout(() => setLoading(false), Math.random() * 4000);
}, []);
// Initial data load:
React.useEffect(fakeNetworkRequest, []);
// After 2 second, we want to show a loader:
useTimeout(() => setShowLoader(true), isLoading ? 2000 : null);
return (<React.Fragment>
<button onClick={ fakeNetworkRequest } disabled={ isLoading }>
{ isLoading ? 'LOADING...
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useState
is a proposed update to ReactJS's API – Mark C. Commented Oct 31, 2018 at 19:14