I am getting this warning in react:
index.js:1 Warning: Cannot update a component (`ConnectFunction`)
while rendering a different component (`Register`). To locate the
bad setState() call inside `Register`
I went to the locations indicated in the stack trace and removed all setstates but the warning still persists. Is it possible this could occur from redux dispatch?
my code:
register.js
class Register extends Component {
render() {
if( this.props.registerStatus === SUCCESS) {
// Reset register status to allow return to register page
this.props.dispatch( resetRegisterStatus()) # THIS IS THE LINE THAT CAUSES THE ERROR ACCORDING TO THE STACK TRACE
return <Redirect push to = {HOME}/>
}
return (
<div style = {{paddingTop: "180px", background: 'radial-gradient(circle, rgba(106,103,103,1) 0%, rgba(36,36,36,1) 100%)', height: "100vh"}}>
<RegistrationForm/>
</div>
);
}
}
function mapStateToProps( state ) {
return {
registerStatus: state.userReducer.registerStatus
}
}
export default connect ( mapStateToProps ) ( Register );
function which triggers the warning in my registerForm component called by register.js
handleSubmit = async () => {
if( this.isValidForm() ) {
const details = {
"username": this.state.username,
"password": this.state.password,
"email": this.state.email,
"clearance": this.state.clearance
}
await this.props.dispatch( register(details) )
if( this.props.registerStatus !== SUCCESS && this.mounted ) {
this.setState( {errorMsg: this.props.registerError})
this.handleShowError()
}
}
else {
if( this.mounted ) {
this.setState( {errorMsg: "Error - registration credentials are invalid!"} )
this.handleShowError()
}
}
}
Stacktrace:
This warning was introduced since React V16.3.0.
If you are using functional components you could wrap the setState call into useEffect.
Code that does not work:
const HomePage = (props) => {
props.setAuthenticated(true);
const handleChange = (e) => {
props.setSearchTerm(e.target.value.toLowerCase());
};
return (
<div key={props.restInfo.storeId} className="container-fluid">
<ProductList searchResults={props.searchResults} />
</div>
);
};
Now you can change it to:
const HomePage = (props) => {
// trigger on component mount
useEffect(() => {
props.setAuthenticated(true);
}, []);
const handleChange = (e) => {
props.setSearchTerm(e.target.value.toLowerCase());
};
return (
<div key={props.restInfo.storeId} className="container-fluid">
<ProductList searchResults={props.searchResults} />
</div>
);
};
I just had this issue and it took me a bit of digging around before I realised what I'd done wrong – I just wasn't paying attention to how I was writing my functional component.
I was doing this:
const LiveMatches = (props: LiveMatchesProps) => {
const {
dateMatches,
draftingConfig,
sportId,
getDateMatches,
} = props;
if (!dateMatches) {
const date = new Date();
getDateMatches({ sportId, date });
};
return (<div>{component stuff here..}</div>);
};
I had just forgotten to use useEffect before dispatching my redux call of getDateMatches()
So it should have been:
const LiveMatches = (props: LiveMatchesProps) => {
const {
dateMatches,
draftingConfig,
sportId,
getDateMatches,
} = props;
useEffect(() => {
if (!dateMatches) {
const date = new Date();
getDateMatches({ sportId, date });
}
}, [dateMatches, getDateMatches, sportId]);
return (<div>{component stuff here..}</div>);
};
please read the error message thoroughly, mine was pointing to SignIn Component that had a bad setState. which when i examined, I had an onpress that was not an Arrow function.
it was like this:
onPress={navigation.navigate("Home", { screen: "HomeScreen" })}
I changed it to this:
onPress={() => navigation.navigate("Home", { screen: "HomeScreen" }) }
My error message was:
Warning: Cannot update a component
(ForwardRef(BaseNavigationContainer)) while rendering a different
component (SignIn). To locate the bad setState() call inside
SignIn, follow the stack trace as described in
https://reactjs.org/link/setstate-in-render
in SignIn (at SignInScreen.tsx:20)
I fixed this issue by removing the dispatch from the register components render method to the componentwillunmount method. This is because I wanted this logic to occur right before redirecting to the login page. In general it's best practice to put all your logic outside the render method so my code was just poorly written before. Hope this helps anyone else in future :)
My refactored register component:
class Register extends Component {
componentWillUnmount() {
// Reset register status to allow return to register page
if ( this.props.registerStatus !== "" ) this.props.dispatch( resetRegisterStatus() )
}
render() {
if( this.props.registerStatus === SUCCESS ) {
return <Redirect push to = {LOGIN}/>
}
return (
<div style = {{paddingTop: "180px", background: 'radial-gradient(circle, rgba(106,103,103,1) 0%, rgba(36,36,36,1) 100%)', height: "100vh"}}>
<RegistrationForm/>
</div>
);
}
}
I think that this is important.
It's from this post that #Red-Baron pointed out:
#machineghost : I think you're misunderstanding what the message is warning about.
There's nothing wrong with passing callbacks to children that update state in parents. That's always been fine.
The problem is when one component queues an update in another component, while the first component is rendering.
In other words, don't do this:
function SomeChildComponent(props) {
props.updateSomething();
return <div />
}
But this is fine:
function SomeChildComponent(props) {
// or make a callback click handler and call it in there
return <button onClick={props.updateSomething}>Click Me</button>
}
And, as Dan has pointed out various times, queuing an update in the same component while rendering is fine too:
function SomeChildComponent(props) {
const [number, setNumber] = useState(0);
if(props.someValue > 10 && number < 5) {
// queue an update while rendering, equivalent to getDerivedStateFromProps
setNumber(42);
}
return <div>{number}</div>
}
If useEffect cannot be used in your case or if the error is NOT because of Redux
I used setTimeout to redirect one of the two useState variables to the callback queue.
I have one parent and one child component with useState variable in each of them. The solution is to wrap useState variable using setTimeout:
setTimeout(() => SetFilterData(data), 0);
Example below
Parent Component
import ExpenseFilter from '../ExpensesFilter'
function ExpensesView(props) {
const [filterData, SetFilterData] = useState('')
const GetFilterData = (data) => {
// SetFilterData(data);
//*****WRAP useState VARIABLE INSIDE setTimeout WITH 0 TIME AS BELOW.*****
setTimeout(() => SetFilterData(data), 0);
}
const filteredArray = props.expense.filter(expenseFiltered =>
expenseFiltered.dateSpent.getFullYear().toString() === filterData);
return (
<Window>
<div>
<ExpenseFilter FilterYear = {GetFilterData}></ExpenseFilter>
Child Component
const ExpensesFilter = (props) => {
const [filterYear, SetFilterYear] = useState('2022')
const FilterYearListener = (event) => {
event.preventDefault()
SetFilterYear(event.target.value)
}
props.FilterYear(filterYear)
return (
Using React and Material UI (MUI)
I changed my code from:
<IconButton onClick={setOpenDeleteDialog(false)}>
<Close />
</IconButton>
To:
<IconButton onClick={() => setOpenDeleteDialog(false)}>
<Close />
</IconButton>
Simple fix
If you use React Navigation and you are using the setParams or setOptions you must put these inside method componentDidMount() of class components or in useEffects() hook of functional components.
Minimal reproducing example
I was a bit confused as to what exactly triggers the problem, having a minimal immediately runnable example helped me grasp it a little better:
index.html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<script src="https://unpkg.com/react#17/umd/react.development.js"></script>
<script src="https://unpkg.com/react-dom#17/umd/react-dom.development.js"></script>
<script src="https://unpkg.com/#babel/standalone#7.14.7/babel.min.js"></script>
</head>
<body>
<div id="root"></div>
<script type="text/babel">
function NotMain(props) {
props.setN(1)
return <div>NotMain</div>
}
function Main(props) {
const [n, setN] = React.useState(0)
return <>
<NotMain setN={setN} />
<div>Main {n}</div>
</>
}
ReactDOM.render(
<Main/>,
document.getElementById('root')
);
</script>
</body>
</html>
fails with error:
react-dom.development.js:61 Warning: Cannot update a component (`Main`) while rendering a different component (`NotMain`). To locate the bad setState() call inside `NotMain`, follow the stack trace as described in https://reactjs.org/link/setstate-in-render
followed by a stack trace:
at NotMain (<anonymous>:16:9)
at Main (<anonymous>:21:31)
Presumably 16:9 would be the exact line where props.setN(1) is being called from, but the line numbers are a bit messed up because of the Babel JSX translation.
The solution like many other answers said is to do instead:
function NotMain(props) {
React.useEffect(() => { props.setN(1) }, [])
return <div>NotMain</div>
}
Intuitively, I think that the general idea of why this error happens is that:
You are not supposed to updat state from render methods, otherwise it could lead to different results depending on internal the ordering of how React renders things.
and when using functional components, the way to do that is to use hooks. In our case, useEffect will run after rendering is done, so we are fine doing that from there.
When using classes this becomes slightly more clear and had been asked for example at:
Calling setState in render is not avoidable
Calling setState() in React from render method
When using functional components however, things are conceptually a bit more mixed, as the component function is both the render, and the code that sets up the callbacks.
I was facing same issue, The fix worked for me was if u are doing
setParams/setOptions
outside of useEffect then this issue is occurring. So try to do such things inside useEffect. It'll work like charm
TL;DR;
For my case, what I did to fix the warning was to change from useState to useRef
react_devtools_backend.js:2574 Warning: Cannot update a component (`Index`) while rendering a different component (`Router.Consumer`). To locate the bad setState() call inside `Router.Consumer`, follow the stack trace as described in https://reactjs.org/link/setstate-in-render
at Route (http://localhost:3000/main.bundle.js:126692:29)
at Index (http://localhost:3000/main.bundle.js:144246:25)
at Switch (http://localhost:3000/main.bundle.js:126894:29)
at Suspense
at App
at AuthProvider (http://localhost:3000/main.bundle.js:144525:23)
at ErrorBoundary (http://localhost:3000/main.bundle.js:21030:87)
at Router (http://localhost:3000/main.bundle.js:126327:30)
at BrowserRouter (http://localhost:3000/main.bundle.js:125948:35)
at QueryClientProvider (http://localhost:3000/main.bundle.js:124450:21)
The full code for the context of what I did (changed from the lines with // OLD: to the line above them). However this doesn't matter, just try changing from useState to useRef!!
import { HOME_PATH, LOGIN_PATH } from '#/constants';
import { NotFoundComponent } from '#/routes';
import React from 'react';
import { Redirect, Route, RouteProps } from 'react-router-dom';
import { useAccess } from '#/access';
import { useAuthContext } from '#/contexts/AuthContext';
import { AccessLevel } from '#/models';
type Props = RouteProps & {
component: Exclude<RouteProps['component'], undefined>;
requireAccess: AccessLevel | undefined;
};
export const Index: React.FC<Props> = (props) => {
const { component: Component, requireAccess, ...rest } = props;
const { isLoading, isAuth } = useAuthContext();
const access = useAccess();
const mounted = React.useRef(false);
// OLD: const [mounted, setMounted] = React.useState(false);
return (
<Route
{...rest}
render={(props) => {
// If in indentifying authentication state as the page initially loads, render a blank page
if (!mounted.current && isLoading) return null;
// OLD: if (!mounted && isLoading) return null;
// 1. Check Authentication is one step
if (!isAuth && window.location.pathname !== LOGIN_PATH)
return <Redirect to={LOGIN_PATH} />;
if (isAuth && window.location.pathname === LOGIN_PATH)
return <Redirect to={HOME_PATH} />;
// 2. Authorization is another
if (requireAccess && !access[requireAccess])
return <NotFoundComponent />;
mounted.current = true;
// OLD: setMounted(true);
return <Component {...props} />;
}}
/>
);
};
export default Index;
My example.
Code with that error:
<Form
initialValues={{ ...kgFormValues, dataflow: dataflows.length > 0 ? dataflows[0].df_tpl_key : "" }}
onSubmit={() => {}}
render={({values, dirtyFields }: any) => {
const kgFormValuesUpdated = {
proj_key: projectKey,
name: values.name,
description: values.description,
public: values.public,
dataflow: values.dataflow,
flavours: flavoursSelected,
skipOCR: values.skipOCR
};
if (!_.isEqual(kgFormValues, kgFormValuesUpdated)) {
setNewKgFormValues(kgFormValuesUpdated);
}
Working Code:
<Form
initialValues={{ ...kgFormValues, dataflow: dataflows.length > 0 ? dataflows[0].df_tpl_key : "" }}
onSubmit={() => {}}
render={({ values, dirtyFields }: any) => {
useEffect(() => {
const kgFormValuesUpdated = {
proj_key: projectKey,
name: values.name,
description: values.description,
public: values.public,
dataflow: values.dataflow,
flavours: flavoursSelected,
skipOCR: values.skipOCR
};
if (!_.isEqual(kgFormValues, kgFormValuesUpdated)) {
setNewKgFormValues(kgFormValuesUpdated);
}
}, [values]);
return (
I had the same problem. I was setting some state that was storing a function like so:
// my state definition
const [onConfirm, setOnConfirm] = useState<() => void>();
// then I used this piece of code to update the state
function show(onConfirm: () => void) {
setOnConfirm(onConfirm);
}
The problem was from setOnConfirm. In React, setState can take the new value OR a function that returns the new value. In this case React wanted to get the new state from calling onConfirm which is not correct.
changing to this resolved my issue:
setOnConfirm(() => onConfirm);
I was able to solve this after coming across a similar question in GitHub which led me to this comment showing how to pinpoint the exact line within your file causing the error. I wasn't aware that the stack trace was there. Hopefully this helps someone!
See below for my fix. I simply converted the function to use callback.
Old code
function TopMenuItems() {
const dispatch = useDispatch();
function mountProjectListToReduxStore(projects) {
const projectDropdown = projects.map((project) => ({
id: project.id,
name: project.name,
organizationId: project.organizationId,
createdOn: project.createdOn,
lastModifiedOn: project.lastModifiedOn,
isComplete: project.isComplete,
}));
projectDropdown.sort((a, b) => a.name.localeCompare(b.name));
dispatch(loadProjectsList(projectDropdown));
dispatch(setCurrentOrganizationId(projectDropdown[0].organizationId));
}
};
New code
function TopMenuItems() {
const dispatch = useDispatch();
const mountProjectListToReduxStore = useCallback((projects) => {
const projectDropdown = projects.map((project) => ({
id: project.id,
name: project.name,
organizationId: project.organizationId,
createdOn: project.createdOn,
lastModifiedOn: project.lastModifiedOn,
isComplete: project.isComplete,
}));
projectDropdown.sort((a, b) => a.name.localeCompare(b.name));
dispatch(loadProjectsList(projectDropdown));
dispatch(setCurrentOrganizationId(projectDropdown[0].organizationId));
}, [dispatch]);
};
My case was using setState callback, instead of setState + useEffect
BAD ❌
const closePopover = useCallback(
() =>
setOpen((prevOpen) => {
prevOpen && onOpenChange(false);
return false;
}),
[onOpenChange]
);
GOOD ✅
const closePopover = useCallback(() => setOpen(false), []);
useEffect(() => onOpenChange(isOpen), [isOpen, onOpenChange]);
I got this when I was foolishly invoking a function that called dispatch instead of passing a reference to it for onClick on a button.
const quantityChangeHandler = (direction) => {
dispatch(cartActions.changeItemQuantity({title, quantityChange: direction}));
}
...
<button onClick={() => quantityChangeHandler(-1)}>-</button>
<button onClick={() => quantityChangeHandler(1)}>+</button>
Initially, I was directly calling without the fat arrow wrapper.
Cannot update a component while rendering a different component warning
I have the same problem but when I dispatch an action inside a component rendered. You should dispatch the action inside useEffect hook to fix that problem
//dispatch action to inform user that 'Marked days already have hours!'
React.useEffect(() => {
if (btn_class == 'redButton') {
dispatch({ type: ActionType.ADD_NOTIFICATION, payload: 'Marked days already have hours!' });
} else {
dispatch({ type: ActionType.ADD_NOTIFICATION, payload: '' });
}
}, [btn_class, dispatch]);
also use union type for btn-class variable
*`
type ButtonState = 'btnAddDay' | 'redButton' | 'btnAddDayBlue' | 'btnAddDayGreen';
`*
Using some of the answers above, i got rid of the error with the following:
from
if (value === "newest") {
dispatch(sortArticlesNewest());
} else {
dispatch(sortArticlesOldest());
}
this code was on my component top-level
to
const SelectSorting = () => {
const dispatch = useAppDispatch();
const {value, onChange} = useSelect();
useEffect(() => {
if (value === "newest") {
dispatch(sortArticlesNewest());
} else {
dispatch(sortArticlesOldest());
}
}, [dispatch, value]);
I have the following component, where review assignments (props.peerReviewAssignmentIds) are loaded for a student's own work (related event is onClick_Submission) or a peer's work to review (related event is onClick_PeerReview ). These events work fine and the related data is loaded successfully. However, there is a problem with updating the content of the child components based on the value of the props.peerReviewAssignmentIds, which I elaborate below.
const AssignmentItem = (props) => {
const assignment = props.assignments[props.currentAssignmentId];
const onClick_Submission = (e) => {
e.preventDefault();
if (!st_showSubmission) {
props.fetchPeerReviewAssignmentForStudent(currentUserId, assignment.activeReviewRoundId);
}
set_showSubmission(!st_showSubmission);
set_isPeerReview(false);
}
const onClick_PeerReview = (e) => {
e.preventDefault();
if (!st_showPeerReviews) {
if (st_submissionContiues === false)
props.fetchPeerReviewAssignmentForReviewer(currentUserId, assignment.activeReviewRoundId);
}
set_showPeerReviews(!st_showPeerReviews);
set_isPeerReview(true);
}
return (
<>
{
st_showSubmission === true && props.peerReviewAssignmentIds.length > 0 &&
<ReviewPhaseInfoForSubmission isPeerReview={false} />
}
</>
)
}
const mapStateToProps = state => ({
peerReviewAssignmentIds: state.peerReviewAssignmentReducer.peerReviewAssignmentIds,
loading_pra: state.peerReviewAssignmentReducer.loading,
error_pra: state.peerReviewAssignmentReducer.error,
})
I will try to explain the problem with an example. When the first time onClick_Submission is triggered, props.peerReviewAssignmentIds[0] is set to 2, and all the sub components are loaded properly. Next, when onClick_PeerReview is triggered, props.peerReviewAssignmentIds[0] is set to 1, which is correct. But, the child components get updated according to the previous value of props.peerReviewAssignmentIds[0], which was 2. If the onClick_PeerReview event is triggered second time, then the child components get updated correctly according to the current value of props.peerReviewAssignmentIds[0], which is 1. Any ideas why this might be happening?
I further explain my code below.
Below is the ReviewPhaseInfoForSubmission component. In this component, based on props.peerReviewAssignmentIds[0] value (which gets updated in the parent component above) etherpadLaterSubmission variable is created with props.createSession_laterSubmission method.
const ReviewPhaseInfoForSubmission = (props) => {
const [st_is_discussFeedback, set_is_discussFeedback] = useState(false);
useEffect(() => {
set_is_discussFeedback(true);
if (props.etherpadLaterSubmission === null) {
props.createSession_laterSubmission(props.peerReviewAssignmentIds[0], discussFeedback.dueDate);
}
}, [])
return (
<div className="p-1">
{
st_is_discussFeedback === true &&
<ProvideOrDiscussFeedback provide0discuss1revise2={1} isPeerReview={props.isPeerReview} />
}
</div>
);
}
const mapStateToProps = (state) => ({
etherpadLaterSubmission: state.etherpadReducer.etherpadLaterSubmission,
loading_ep: state.etherpadReducer.loading,
})
Then, in a child component, ProvideOrDiscussFeedback (see below), the props.etherpadLaterSubmission value is used for display purposes.
const ProvideOrDiscussFeedback = (props) => {
return <div className="p-3 shadow">
{
props.etherpadLaterSubmission &&
<div>
<DisplayingEtherpad etherpadSession={props.etherpadLaterSubmission } />
</div>
}
</div>
}
In my home screen I want to auto hide my header in 2 seconds, then I will have a button to show the header when pressed. I have tried with HomeStack.Screen but could not achieve it, I have to create my custom header called HeaderHomeComponent.js and imported it on my homescreen, still I could not achieve it. Please I need help on this issue.
Here is my code:
const [showHeader, setShowHeader] = useState(true);
const onRecord = async () => {
if (isRecording) {
camera.current.stopRecording();
} else {
setTimeout(() => setIsRecording && camera.current.stopRecording(), 23*1000);
const data = await camera.current.recordAsync();
}
};
const visibility = () => {
setTimeout(() => setShowHeader(false), 2000);
}
return (
<View style={styles.container}>
<RNCamera
ref={camera}
type={cameraType}
flashMode={flashMode}
onRecordingStart={() => setIsRecording(true)}
onRecordingEnd={() => setIsRecording(false)}
style={styles.preview}
/>
<HeaderHomeComponent />
You can create a function with useeffect.
Make sure you passs show and handleClose functions from Parent. (Example given below).
const MessageBox = (props) => {
useEffect(() => {
if (props.show) {
setTimeout(() => {
props.handleClose(false);
}, 3000);
}
}, [props.show]);
return (
<div className={`messageBox ${props.show ? "show" : null}`}>
{props.message}
</div>
);
};
UseEffect will be called everytime props.show state will change. And we only want our timer to kick in when the show becomes true, so that we can hide it then.
Also, now to use this, it's simple, in any component.
const [showMessageBox, setShowMessageBox] = useState(false);
return(
<MessageBox
show={showMessageBox}
handleClose={setShowMessageBox} />
);
Also, make sure to handle css, part as well for show and hide.
Simple Example below.
.messageBox {
display: none;
}
.messageBox.show {
display: block;
}
Hope this helps, :-)
You need to do something like this as Mindaugas Nakrosis mentioned in comment
const [showHeader, setShowHeader] = useState(true);
useEffect(() => {
setTimeout(() => setShowHeader(false), 2000);
}, []);
In return where your header is present
{
showHeader && <HeaderHomeComponent/>;
}
I think the approach gonna fit "auto hide and show in 2 seconds", is using Animetad opacity, and giving fix height or/and z-index (as fit you) to the element
// HeaderHomeComponent.js
const animOpacity = useRef(new Animated.Value(1)).current // start with showing elem
//change main view to
<Animated.View
style={{ ...yourStyle... ,
opacity: animOpacity,
}}
>
and then for creating the animation somewhere
() => {
Animated.timing(animOpacity, {
toValue: +(!animOpacity), // the numeric value of not current
duration: 2000, // 2 secs
}).start();
}}
The hieraric location of the declaration of the ref should control usage as calling the effect. maybe you can create useEffect inside the header that can determine if it should be visible or not depends navigation or some other props.
hope its helpful!
Turns out the problem was my computer. However, James made some good points about how to isolate the problem and utilizing useCallback and useMemo to optimize.
I am having problems with the performance of my react app. For now I'm excluding the code because I feel there might be some common sense answers.
This is the demo video
Here some pointers
I don't have unnecessary re-renders. Only individual components get rendered when they are hovered.
The animations are confined to a container div of the hovered element so no re-paints happen on the page outside of that container when hovering.
I am not using any heavy code for the hover effect or detection.
I am wondering what else could be cause for performance problems like this. As far as I understand, the number of components shouldn't matter if they are just sitting there, not rerendering.
Here is the code for the card component that is being animated. I wasn't quite sure whats important to show here. The parent component showing all the cards does not re-render.
export default function CardFile(props) {
// Input field
const input = useRef(null)
//Input state
const [inputActive, setInputActive] = useState(false);
const [title, setTitle] = useState(props.file.name)
const [menuActive, setMenuActive] = useState(false)
const [draggable, setDraggable] = useState(true)
const [isDragged, setIsDragged] = useState(false)
// counter > 0 = is hovered
const [dragCounter, setDragCounter] = useState(0)
//_________________ FUNCTIONS _________________//
// Handle file delete
const handleDelete = (e) => {
firebase.firestore().collection('users').doc(props.file.owner).collection('files').doc(props.file.id).delete().then(() => {
console.info('Deleted')
}).catch((err) => console.err(err))
}
// Prevent default if necessary
const preventDefault = (e) => {
e.preventDefault()
e.stopPropagation()
}
// Handle rename
const handleRename = (e) => {
e.stopPropagation()
setMenuActive(false)
setInputActive(true)
}
// Handle change
const handleChange = () => {
setTitle(input.current.value)
}
// Handle focus loss
const handleFocusLoss = (e) => {
e.stopPropagation()
setInputActive(false)
firebase.firestore().collection('users').doc(props.file.owner).collection('files').doc(props.file.id).update({ name: title })
.then(() => {
console.info('Updated title')
}).catch((err) => console.error(err))
}
// Handle title submit
const handleKeyPress = (e) => {
console.log('key')
if (e.code === "Enter") {
e.preventDefault();
setInputActive(false)
firebase.firestore().collection('users').doc(props.file.owner).collection('files').doc(props.file.id).update({ name: title })
.then(() => {
console.info('Submitted title')
}).catch((err) => console.error(err))
}
}
// Set input focus
useEffect(() => {
if (inputActive) {
input.current.focus()
input.current.select()
}
}, [inputActive])
//_____________________________DRAGGING___________________________//
//Handle drag start
const onDragStartFunctions = () => {
props.onDragStart(props.file.id)
setIsDragged(true)
}
// Handle drag enter
const handleDragEnter = (e) => {
// Only set as target if not equal to source
if (!isDragged) {
setDragCounter(dragCounter => dragCounter + 1)
}
}
//Handle drag end
const handleDragEnd = (e) => {
e.preventDefault()
setIsDragged(false)
}
// Handle drag exit
const handleDragLeave = () => {
// Only remove as target if not equal to source
if (!isDragged) {
setDragCounter(dragCounter => dragCounter - 1)
}
}
// Handle drag over
const handleDragOver = (e) => {
e.preventDefault()
}
// Handle drag drop
const onDragDropFunctions = (e) => {
setDragCounter(0)
// Only trigger when target if not equal to source
if (!isDragged) {
props.onDrop({
id: props.file.id,
display_type: 'file'
})
}
}
return (
<div
className={`${styles.card} ${dragCounter !== 0 && styles.is_hovered} ${isDragged && styles.is_dragged}`}
test={console.log('render')}
draggable={draggable}
onDragStart={onDragStartFunctions}
onDragEnter={handleDragEnter}
onDragOver={handleDragOver}
onDragEnd={handleDragEnd}
onDragLeave={handleDragLeave}
onDrop={onDragDropFunctions}
>
<div className={styles.cardInner}>
<div className={styles.videoContainer} onClick={() => props.handleActiveMedia(props.file, 'show')}>
{props.file.thumbnail_url && props.file.type === 'video' &&
<MdPlayCircleFilled className={styles.playButton} />
}
{!props.file.thumbnail_url && props.file.type === 'image' &&
<MdImage className={styles.processingButton} />
}
{!props.file.thumbnail_url && props.file.type === 'video' &&
<FaVideo className={styles.processingButton} />
}
<div className={styles.image} style={props.file.thumbnail_url && { backgroundImage: `url(${props.file.thumbnail_url})` }}></div>
</div>
<div className={styles.body}>
<div className={styles.main}>
{!inputActive ?
<p className={styles.title}>{title}</p>
:
<input
ref={input}
className={styles.titleInput}
type="text"
onKeyPress={handleKeyPress}
onChange={handleChange}
onBlur={handleFocusLoss}
defaultValue={title}
/>
}
</div>
<ToggleContext onClick={() => setMenuActive(prevMenuActive => !prevMenuActive)}>
{
menuActive && <div className={styles.menuBackground} />
}
<Dropdown top small active={menuActive}>
<ButtonLight title={'Rename'} icon={<MdTitle />} onClick={handleRename} />
<ButtonLight title={'Label'} icon={<MdLabel />} onClick={() => props.handleActiveMedia(props.file, 'label')} />
<ButtonLight title={'Share'} icon={<MdShare />} onClick={() => window.alert("Sharing is not yet supported. Stay put.")} />
{/*props.file.type === 'video' && <ButtonLight title={'Split'} icon={<RiScissorsFill />} />*/}
<ButtonLightConfirm
danger
title={'Delete'}
icon={<MdDelete />}
onClick={(e) => preventDefault(e)}
confirmAction={handleDelete}
preventDrag={() => setDraggable(false)}
enableDrag={() => setDraggable(true)}
/>
</Dropdown>
</ToggleContext>
</div>
</div>
</div>
);
}
And here is the css for animating it:
.is_hovered {
box-shadow: 0 0 0 3px var(--blue);
}
.is_hovered > div {
transform: scale(0.9);
box-shadow: 0 0 5px rgba(0, 0, 0, 0.08);
transition: .1s;
}
Edit: Added code
Edit2: Updated sample video to show re-renders
The thing I think you should try first is 'memoizing' all your functions with useCallback. Especially as you're passing some of these functions down to other components, it's possible they are causing unnecessary re-rendering deeper in the DOM.
I don't know if you're familiar with useCallback, but basically it just wraps around your function, and only updates it when specific values change. This allows React to avoid re-creating it on every render and causing components deeper in the DOM to re-render.
You can read the docs here, but the gist of it is that instead of const getA = () => a you would write getA = useCallback(() => a, [a]), and the array contains all the dependencies for the function which cause it to update if changed.
Make sure you use these in your JSX, and avoid arrow functions like onClick={(e) => preventDefault(e)}. The function you have called preventDefault can even live outside the component entirely, since it makes no reference to anything specific to the component.
Try making these updates and see if it makes a difference. Also test without the console.log, since that can also slow things down.
I am working on a mockup blog for my portfoilio which has a grid of posts which are 400x400 cards with a hover effect that increases scale and adds a drop shadow (this is rendered in the dashboard route).
I have noticed however that when scrolling my page, the pointer will get hung up on the cards and stop registering scroll when the animation is enabled. I have come across this article (https://www.thecssninja.com/javascript/pointer-events-60fps) discussing the performance benefits of disabling pointer events to the body on scroll however I cannot figure out how to do this in react.
How would you add a class to the document body in React ONLY while scrolling and remove that class as soon as the scroll event had ended? Maybe with a setTimeOut in some way?? I feel like that would be a janky solution...
I included the code I am looking to implement this in, I don't know if that will help. The scroll event I have set up already is to maintain the scroll position of the page while the navbar is extended.
export default class Layout extends Component {
constructor(props) {
super(props);
this.state = {
hasMenuOpen: false,
scroll: {x: 0, y: 0},
};
this.handleScrollY = _.debounce(this.handleScrollY, 250);
this.handleWidthChange = _.debounce(this.handleWidthChange, 250);
}
componentDidMount() {
window.addEventListener('scroll', this.handleScrollY);
window.addEventListener('resize', this.handleWidthChange);
console.log('mount');
}
componentDidUpdate(prevProps, prevState, snapshot) {
if (prevState.hasMenuOpen) {
/* eslint-disable */
let {x, y} = prevState.scroll;
/* eslint-enable */
// correct scroll y position back to 0 for positions <= 100
window.scrollTo(x, (y <= 100 ? y = 0 : y));
}
}
componentWillUnmount() {
window.removeEventListener('scroll', this.handleScrollY);
window.removEventListener('resize', this.handleWidthChange);
}
// if menu is open an y = 0 (i.e position: fixed was added),
// scroll = previous states scroll
// else if you scroll and the menu isn't open, scroll = windows new scroll pos
handleScrollY = () => {
const y = window.scrollY;
const x = window.scrollX;
this.setState((prevState) => {
if (this.state.hasMenuOpen && y === 0) {
return {scroll: Object.assign({}, prevState.scroll)};
}
return {scroll: Object.assign({}, prevState.scroll, {x}, {y})};
});
}
handleWidthChange = () => {
console.log(window.innerWidth);
if (this.state.hasMenuOpen) {
return this.handleBurgerClick();
}
return null;
}
handleBurgerClick = () => {
this.setState((prevState) => ({
hasMenuOpen: !prevState.hasMenuOpen
}));
}
handleLinkClick = () => {
this.setState((prevState) => ({
hasMenuOpen: false
}));
}
render() {
const scrollTop = {
top: `-${this.state.scroll.y}px`,
};
console.log(this.state.scroll);
return (
<React.Fragment>
<Navbar onClick={this.handleBurgerClick} hasMenuOpen={this.state.hasMenuOpen} onLinkClick={this.handleLinkClick} />
<div className={this.state.hasMenuOpen ? styles.scroll_lock : ''} style={this.state.hasMenuOpen ? scrollTop : {}}>
<main className={styles.page_margin} >
<div className={this.state.hasMenuOpen ? styles.margin_extended : styles.margin_top}>
<Route path='/' exact component={Dashboard} />
<Route path='/new-post' component={NewPost} />
</div>
</main>
</div>
</React.Fragment>
);
}
}
For example I have tried setting document.body.style.pointerEvents = 'auto' in componentDidMount() and disabling it in the handleScrollY() however this obviously doesn't work as pointer events are never restored once the scroll event occurs. I have also tried setting it in componentDidUpdate() but that doesn't seem to work either as no component is being updated when the scroll event isn't happening.
One way of toggling a css class is:
componentWillUnmount() {
document.removeEventListener('scroll');
}
componentDidMount() {
document.addEventListener('scroll', (event) => {
const that = this;
if (!that.state.isScrolling) {
that.setState({ isScrolling: true });
setTimeout(() => {
that.setState({ isScrolling: false });
}, 300);
}
});
}
And then use the state or props to toggle the className
in your JSX something like
return (
<div className={`class1 class2 class99 ${this.state.isScrolling ? 'scrolling' : 'not-scrolling'}`} >Content</div>
)