Questions tagged [use-effect]
React Hooks provide developers with the ability to utilize state(s) and various other lifecycle features of React components without having to create a class-based component.
Please do not mistake this for a duplicate. Despite my thorough search on various blogs and sources, I have yet to find a solution. My primary question is 'how can I address the error of react state change in unmounted component, and also cancel an async ...
import { useState, useEffect } from "react"; import LoginModal from "./LoginModal"; import { NavLink, useLocation, useNavigate } from "react-router-dom"; import { useDispatch } from "react-redux"; import { userLogout ...
Is there a way to remove the dependency on the auth state in a React hook, specifically when using useEffect? I'm looking for a solution that avoids redundancy and the need to create another similar hook. export const useHookAuth = () => { // u ...
I'm trying to create an order when a MUI dialogue is opened. I attempted to use useEffect with an empty dependency, but for some reason the mutation doesn't resolve before the setState action. The activeOrder always returns a Promise that is fulf ...
On my homepage, I have implemented code like this: {selectedTab===0 && <XList allItemList={some_list/>} {selectedTab===1 && <YList allItemList={some_list2/>} Within XList, the structure is as follows: {props.allItemList.map(ite ...
I am retrieving data from a Firebase database and it works when the component initially renders. However, I am struggling to make it fetch again whenever there is a new entry in the database. Here is what I've attempted: I tried passing a state variable ...
Within my child React component, I receive an itemList prop from the parent component. This prop is an array of objects that contain data fetched from an endpoint. My goal in the child component is to enhance each object in the itemList array by adding mo ...
This is my index.js file running on the server side const express = require('express'); const app = express(); const server = require('http').createServer(app); const PORT = process.env.PORT || 5000; const router = require('./router'); const io = require ...
Currently, I am developing a React blog application where posts are stored in markdown files along with metadata in Firestore. The content .md files are saved in Cloud Storage. In the App component, I utilize useEffect to retrieve the metadata for each pos ...
Developing a React album viewing application: The goal is to create a React app that allows users to view albums. The interface should display a list of users on the left side and, upon selecting a user, show a list of albums owned by that user on the righ ...
I'm facing some issues with my useEffect hook and I can't seem to figure out why it's not working. I've been trying to make a call to an endpoint, but it seems like I'm not getting any response back. Any help would be greatly appreciated. (I have updated ...
How can I trigger a fetch request when a user clicks on the submit button without using class components? export default function SearchSong() { const [topSongs, setTopSongs] = useState([]); useEffect(() => { const fetchData = async () ...
I am currently facing a challenge with an infinite scroll listview in react native. I have created a calendar list that needs to dynamically change based on the selected company provided as a prop. The issue arises when the prop (and the myCompany state) a ...
I created an autoplay Slider with three cards using the useEffect hook. However, the manual "previous" and "forward" buttons are not functioning correctly. The useState function is not updating values as expected, leading to unexpected changes in state. ...
Currently, I am working on developing a versatile infinite scrolling feature using React Hooks along with the ResearchGate React Intersection Observer. The main concept revolves around a parent passing down a mapped JSX array of data and a callback functio ...
Is it possible to invoke a function (as a callback of a button) that was declared within the useEffect hook? The basic structure of the component is as shown below: useEffect(() => { const longFunction = async () => { ... const innerFuncti ...
In my straightforward app, I have implemented a feature where if a user is already signed in and manually tries to access the /signin page, they are automatically redirected to the index page. This functionality is achieved by running a function within the ...
I have a straightforward component that initiates an asynchronous request when a certain state changes: const MyComponent = () => { const [currentState, setCurrentState] = useState(); const [currentResult, setCurrentResult] = useState(); useEffec ...
My custom useEffect() hook is consistently executed twice. It relies on two dependencies: reinitializePage (which triggers the useEffect when set to true) and corporateContext (which updates the component when the context changes). const [reinitializePage, ...
Below is the correct useEffect code snippet: useEffect(() => { if (state.companyId !== undefined && state.companyId === -1) { return; } if (accessNotesRef.current) { accessNotesRef.current.focus(); } if (vinR ...
I often encounter this problem. When I chain useEffects to trigger after state changes, some of the useEffects in the chain have overlapping dependencies that cause them both to be triggered simultaneously instead of sequentially following a state change. ...
Currently, I am dealing with an objectList and a size variable in my React component. const [objectList, setObjectList] = useState([]); // this array will be populated elsewhere const [size, setSize] = useState([props.width, props.height]); // the size may ...
In my code, I am using a useEffect hook to update the state with setState. However, I'm encountering some unusual and inconsistent behavior with the previous parameter: useEffect(() => { setCurrentPicturesObject((existing) => { ...
Currently, I am building a helpdesk system for a school project using Next JS and Supabase. However, I have encountered an issue with the real-time chat functionality between the operator and the client. My approach involves subscribing to a table in the ...
I have encountered an issue with my component where the correct data is showing up in the console under "data", but when attempting to run a map function on it, I am receiving an error message stating that "map is not a function." The console shows 16 item ...
When passing foo in the arguments of useEffect to use existing array values, it causes an infinite loop because setting new values triggers the f() function again. How can this be resolved? An example of imaginary code is: const [foo, setFoo] = useState&l ...
My goal is to have a functional component with initialized state using useState, which can be updated through an input field. However, upon unmounting the component, I want to log the current state instead of the initial one. In this hypothetical scenario ...
Introduction Currently, I am retrieving data from the openweatherAPI, which is being displayed in both the console and on the page. Issue My problem lies in not being able to showcase the default data on the frontend immediately upon the page's fir ...
Any tips on how to resolve warnings such as this one src\components\pages\badge\BadgeScreen.tsx Line 87:6: React Hook useEffect has a missing dependency: 'loadData'. Either include it or remove the dependency array react-hoo ...
I am facing an issue with two different useEffect hooks where the dependency arrays are different. const [dateFilterSort, setDateFilterSort] = useState({ queryText: initialQueryText(params.sortName), cardText: initialCardText(params.sortName), ...
I have an enigma. A custom React hook is in play here that fetches data based on time periods and saves the results in a Map: export function useDataByPeriod(dateRanges: PeriodFilter[]) { const isMounted = useMountedState(); const [data, setData] ...
I am currently developing a Spotify stats app, and I am facing an issue with creating a context to store the token provided by the app in the URL when a user logs in. TokenContext.js: import React, { useEffect, useState } from "react"; // token ...
import { FontAwesomeIcon } from '@fortawesome/react-fontawesome'; import { faSearch, faAmbulance, faAnchor, faPlus, faFloppyDisk, } from '@fortawesome/free-solid-svg-icons'; import { Input, Table, Button, Modal, ModalBody, ModalHeader ...
I am currently working on a function that populates a useState array containing objects representing cars. These cars appear on the left side of the screen and move across until they are off-screen. My goal is to remove these cars from the state array once ...
Struggling to get a useEffect hook to trigger when its dependency is a useContext variable. The Context contains an "update" variable that changes, but the effect doesn't fire as expected. import { useEffect, useState, useContext } from "react" import ...
I'm currently developing a search feature using Algolia search functionality. Users can input a search term from another site, be redirected to the search page, and have the search executed automatically. Once on the search page, users must utilize the se ...
I'm currently working on a web application with React and Material UI, which includes a registration form. After submitting the registration form successfully, I want to display a success message at the top of the page. To ensure consistency across m ...
My goal is to store the response data in the variable activityType. Within the useEffect function, I am iterating over an API based on the tabs value. The API will return a boolean value of either true or false. While I can successfully log these values ...
Upon mounting the component, I fetch a list of testsuites through an API call, which returns the list in chronological order. I then set these options as choices for a select dropdown using Material-UI. Next, I set the selected option to the latest testSui ...
Incorporating the React useEffect hook into my code has been a bit challenging. Here is how I am attempting to use it: function App() { React.useEffect(() => { console.log('effect working') }, []) return ( <div className="App" ...
In my code, I have implemented a custom hook to handle global data fetching based on user authentication. Here is an example of the hook: const userState = useSelector(state => state.user.state) useEffect(() => { if(userState === "authentic ...
TL;DR : I am in the process of converting my class-based App component to a Functional component but encountering unexpected outcomes with the useEffect Hook. Being relatively new to React, I originally built my movie search app using a class-based approa ...
Check out the snippet of code I've provided: function StoryCarousel(props) { const [ivrDests, setIVRDests] = useState([]); useEffect(() => { async function getIVRDests() { var data = { "customer-id": cust ...
I've successfully implemented the Recoil docs to create the code below, which is functioning properly. However, I am encountering the following warning: Warning: Can't perform a React state update on a component that hasn't mounted yet. This indicates tha ...
I have encountered an issue where I need to ensure that the useEffect Hook in React runs only once. This is mainly because I am initializing a leaflet.js map that should not be initialized more than once. However, anytime I make changes to the component's ...
I am constantly generating random numbers every 2 seconds and checking if these numbers exist as keys in my state object called data. If the number is found, I increment the value associated with that key; otherwise, I add it as a new field with a defaul ...
Utilizing the useEffect hook, I implemented a data fetching mechanism from a locally stored JSON file to initialize the component's state. Strangely, although console.log(header) correctly displays the object, uncommenting the {/* {header.name} */} secti ...
I am currently developing a React application that is responsible for fetching data from an API. This API requires Bearer Token Authorization. To handle this, I have implemented useState() hooks for both the token and the requested object. Additionally, th ...
I've been experimenting with utilizing useEffect() within my React hook to ensure the state updates when the props change. However, I've noticed a delay where the useEffect is only triggered after clicking again on an element in my hook. As someone who i ...
I am facing an issue where two functions in my component are not being called every time it renders, despite my efforts. Placing these functions in the dependency array causes an infinite loop. Can anyone identify why they are not executing? function Por ...
After implementing the useEffect hook in React, I am noticing an unusual output on the browser. The counter, which is supposed to increment every 1 second, gets stuck after reaching 10. If you could take a moment to review the code and test it on any onlin ...
Hey there! I've got some code that's pretty straightforward and not too complicated, so please take a moment to read through it. (I'm using React with Next.js) First off, in the root file app.js, there's a useEffect function that fetch ...
I am experimenting with React to allow users to click the heart icon to like or unlike a movie. I'm using useState() and useEffect(), but even though the element gets a new class name, the color doesn't change when clicked. https://i.stack.imgur.com/blbWJ. ...
I am in the process of creating an exploration page that utilizes URL query parameters (utilizing NextJs pages with getServerSideProps). When an external user visits the URL domain.com/explore?type=actions&category=food, it will retrieve data for "act ...
I am working on a function that utilizes the UseEffect to maintain wallet connectivity even when the page is refreshed. Here is the code snippet for my NavBar component: const NavBar = ({ accounts, setAccounts }) => { const isConnected = Boolean(acc ...
I'm trying to figure out how I can avoid running an API call in my component on initial rendering. The prop needed for the API call should be updated only after a form submission. Although I have included the prop in the dependency array of useEffect, th ...
I am currently developing a MERN stack application that retrieves information regarding college classes and presents it in a table format. The CoursesTable.js component is structured as follows: import React, { useState, useEffect } from 'react'; ...
UPDATE: I've implemented the code provided by the instructor in this post, however, despite using the state isMounted and the cleanup function in useEffect, I am still facing the same issue. The code appears to be functioning correctly, but I consistently ...
import React, { useState, useEffect } from 'react'; Grabbing my custom hooks function useFetch(url, defaultResponse) { const [data, setData] = useState(defaultResponse); async function getDataFromAPI(url) { try { ...
Every time the page is loaded, I want to randomize an array. I am working with Nextjs and facing the issue of client-server mismatch. I have been advised to use a useEffect hook to solve this problem, but I seem to be doing it incorrectly. Can someone plea ...
Regarding the useEffect() function and its behavior upon initial page render, there are several questions. Even after confirming that my code is correct with regards to the parameters passed to useEffect, I am still facing the same issue. useEffect(() => ...
As I integrate the useNavigate hook within React to guide users to a specific page post-login, an unexpected infinite loop arises. Most sources online recommend utilizing the useNavigate hook inside a useEffect block; however, this method triggers a Warnin ...
I'm struggling to figure out why my useEffect() React function is unable to access my Component's state variable. My goal is to create a log when a user abandons creating a listing in our application and navigates to another page. I've imple ...
I am currently working on developing a Weather app to enhance my React skills, but I am facing some challenges. You can access the code I have written here: Codesandbox My project consists of 3 components: Form.jsx Weather.jsx WeatherDetail.jsx Weather. ...
Recently, I made the switch to using locomotive scroll with next.js. However, after upgrading to react v18, my clean up stage has suddenly stopped working. Can someone shed some light on why this might be happening? useEffect(() => { let scroll; import( ...
I need assistance with reloading my React.js page after clicking the submit button. The purpose of this is to update the displayed data by fetching new entries from the database. import React, {useEffect, useState} from 'react'; import axios from "axi ...