All Questions
Tagged with react-hooks react-state
398
questions
-1
votes
0
answers
19
views
React useState update optimization // general Dataflow optimization
I have build an application for scheduling shifts. My problem is now that with a few more employees the performance suffers. It is currently acceptable, but I want to futureproof my system.
React ...
- 43
-1
votes
0
answers
36
views
Why is my React state behaving unpredictably?
I'm working on a Typescript React app with next.js where the user can have many projects, and I'd like them to be able to delete a project. I've set up these components that accommodate that: a ...
- 9
1
vote
2
answers
39
views
Stopping a timer in React by meeting a condition (instead of with a "stop" button)
I've built a simple stopwatch with start and stop buttons. I've also built a really barebones matching game where a user clicks on 5 different squares that start out as random colors (possibility of ...
- 15
0
votes
1
answer
42
views
Extracting and aggregating a state of lower components / Avoiding rendering
I have a question regarding react state. I'm still a beginner but - I have a table with three columns. In two of these, I have input fields. I set it up each row is a component and has its own state. ...
- 17
0
votes
2
answers
38
views
React Asynchronous states Problem - state in Context set to true but remains false in the component (React authentication with Context and API call)
I have a problem with asynchronous states on React
I use context to determine whether the admin is authenticated and has the right to access a page with a state called isAuth
interface UserContext {
...
- 29
0
votes
0
answers
31
views
ReactJs Handling Css Animation Using Classes Between Parent and Child
I'm having an issue when trying to handle Css Animation in a ReactJs App. I'm using Classnames to trigger the Css Animations (a bit excessive but mostly just for testing)
#messagesWrapper { position: ...
- 4,004
0
votes
2
answers
34
views
React : useState not updating object state keys as expected
I have a form with many input elements and a button which goes on next page. Before moving forward it validates all the inputs in such a way that if any it is empty then the corresponding label should ...
0
votes
0
answers
65
views
Change react-hook-form input value with custom hook [duplicate]
For a registered input, I failed to update it using my own custom hook. In my sample codes as shown below, the result2 didn't set to "bar" when the button was clicked, although r2 was ...
- 394
1
vote
1
answer
37
views
Edit object in array directly in React is working but use hooks is not
import { useState } from "react";
type Rule = {
value: string;
valid: boolean;
};
type RuleComponentProps = {
rule: Rule;
setValue: (value: string) => void;
setValid: (valid: ...
- 2,726
-1
votes
1
answer
29
views
useCallback is recreate function when variable is not in dependency list
Hello I have a Login modal where I also have function onSubmit, it's next js application. So it's changing state of setIsLoading, then it's recreating component, but not the function? Am I right?. ...
- 13
0
votes
2
answers
71
views
Stale state inside an event handler
I have a JS library (Cytoscape) inside my React component. The library need to be handled events with set event handler functions (on diagram/ component initilazation).
The problem is that inside ...
- 1,580
1
vote
1
answer
33
views
React CSS Transition Not Triggering for Specific Elements After State Update
I'm working on a simple React application that involves moving tiles on a board. The application uses CSS for animations and React state to track the tiles' positions. I have a transition function ...
- 15
0
votes
2
answers
78
views
Getting different behavior between useState() and useRef() + useState()
I am getting different behavior between the two code blocks when I believe they should be the same. My goal is to update compass heading using watchHeadingAsync and perform and animation from the ...
- 125
0
votes
0
answers
21
views
AG Grid cell validations are not updating when rows are updated
Use Case: I'm using AG Grid to render tables. I have to disable 'Save' button when there is no data in 2 cells(called conditions, terms) in a particular row.
Issue: I've created my own Select ...
- 928
0
votes
2
answers
66
views
storing previous states of a hook
I want to print the current and previous value of a state, I have a piece of code that does the job
function App() {
const [value, setValue] = useState("");
const prevValue = useRef('')
...
- 224