Advertisements I’m building some API hooks and I have trouble with deps property. I want to reinvoke the useEffect when content of deps changes, instead I’m running in a forever loop. deps can be either undefined or an any[] export const useReader = <TResponseData>({ url, deps, options }: TypeUseReader<TResponseData>) => { const [data, setData] =… Read More How to keep track of the object reference in a useEffect?
Advertisements So i have this Home Component, where there is a records state, i use it to perform a records.map() and return RecordItem components inside the table. function Home() { const [records, setRecords] = useState<Array<RecordType>>(loadRecords()); const removeRecord = useCallback((record: RecordType) => { setRecords(records => { const newRecords = records.filter(rec => rec !== record); localStorage.setItem(‘controle_financeiro’, JSON.stringify(newRecords));… Read More React memo and/or useCallback not working as expected
Advertisements I am having a object that looks like the following: export const data = { "Category 1": [ { key: "1", label: "Applications", children: [ { key: "3", label: "Browser", children: [ { key: "4", label: "Mozilla", children: [] }, { key: "5", label: "Firefox", children: [] } ] } ] } ], "Category… Read More Rendering Hierarchy based on data using Object.entries
Advertisements If a component is rendered. I want to open a new tab. (window.open(url, "_blank")?.focus();) But (during development) this tab is opened twice because of the React.StrictMode. How can I prevent this from being called multiple times without disabling the StrictMode? My Attempts: function MyComp() { useMemo(() => window.open(url, "_blank")?.focus(), []); return <div>…</div>; } (doesn’t… Read More React – open new tab once
Advertisements I am trying to do a multistep form, with a final form summarizing information that the user wrote in previous steps before they can submit. But when I write into inputs, it doesn’t display anything even if the console returns characters. Here is a link where I reproduced the issue. What am I doing… Read More How to pass form object as props to React function components?
Advertisements I am unable to figure out how to iterate through the rendered List in React Js and access the key and value properties. Code snippet const Cards = ({arr}) => { return ( <ul className=’output’> {arr.map(e => { return <li key={e.id} className="card" > {e.value} <FaTimes color=’red’ style={{cursor: ‘pointer’}} onClick={e => console.log(e.value)}/> </li> })} </ul>… Read More How to iterate through list elements in react?
Advertisements I’ve just recently started to learn about what a macro is in the context of Lisp. My understanding is that, basically, the code is executed in two passes. On the first pass, the interpreter identifies calls to macros and replaces them with their return value. On the second, it executes the code normally. This… Read More Are custom hooks in React (like) macros?
Advertisements I have a useFetchPokemon hook that includes the following code: import { useState, useEffect } from "react"; export const useFetchPokemon = () => { const initialUrl = "https://pokeapi.co/api/v2/pokemon" const [pokemon, setPokemon] = useState([]) as any; const [nextUrl, setNextUrl] = useState(null) const [previousUrl, setPreviousUrl] = useState(null) const getPokemonDetails = async (listOfPokemon: any) => { const… Read More React state not updating with new data being fetched?
Advertisements I’m not sure how to tackle this problem. I have two or more buttons and whenever I click on a button, I want my text to change. Any ideas? import "./styles.css"; function App() { return ( <div className="App"> <h1>Change me!</h1> <button>Button 1</button> <button>Button 2</button> <button>Button 3</button> </div> ); } >Solution : This is a… Read More Change headline text when clicking on multiple buttons in React
Advertisements I’m developing an React app that have different user types. Each user has specific items on it’s menu. An item may be a link or a submenu. I want to render buttons for link items and collapses (of react-bootstrap) for submenus. But, to have the Collapse to work properly, I need to add a… Read More Add state as property on each item of an array of object