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Questions tagged [react-lifecycle-hooks]

Functions that provides visibility into React component life-cycle.

A component in React has a life-cycle, a number of different phases it goes through from birth to death. We can hook into those different phases to get some pretty fine grained control of our application.

To do this we add some specific methods to our component class which get called during each of these life-cycle phases, we call those methods hooks.

Reference

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How to avoid unnecesary update in a stateless component with a React class-based component as a parent

I´m learning React and i found that React.memo() "is not working", because my component again re-render on every update that i do on the parent class-based component. But the problem is that props on component don´t change, at least it make sense…
SAUL ROJAS
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How to move away from componentWillReceiveProps

As componentWillReceiveProps is deprecated, How do we migrate the below code? componentWillReceiveProps (nextProps) { if (nextProps.reloadData && nextProps.realoadDataId) { this.props.onChange({target: {id: 'reloadData', value:…
Siva
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React useMemo x is not a function

I have a react app with hooks where I needed to replicate the behavior of componentWillMount. I read here that for this purpose useMemo could be used so my code roughly looks like this const Component = ({ some props, ...props }) => { …
KiYa
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React function component state is not available at ComponentWillUnmount

I need to make api call when ComponentWillUnmount. Iam using state variable to set api request. when i access the state variable from ComponentWillUnmount. the state value is default one but am expecting recently updated state. export const…
paranthaman ..sam
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How to Use componentDidMount() in Functional Component to execute a function

I have a functional component which had a button to call a method in it. Now i want to get rid of the button and call that method without any actions once the component loads. I am making API calls inside this method and passing on the results to…
Jainam Shah
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Jotai + React: unexpected re-rendering, and unexpected stale state value

I'm making a game that, like most games, has various scenarios that can be triggered from anywhere else in the game. I opted to use Jotai as I found it very easy to use as a global state management tool. Jotai atoms behave a bit like setState and…
Angus Ryer
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Why won't my react component re-render when componentShouldUpdate returns true?

I'm having trouble understanding how the lifecycle hooks work in my React application. I have an application in which I pass some props to my Pagination component in my render method like so:
gib65
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React useReducer hook and functional component lifecycle guarantees

I'd like to confirm an assumption I am making about functional components and useReducer. From my understanding useState is useReducer under the covers so I'll use useState in this example to simplify. function Example(){ const [count, setCount] =…
nathanwinder
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Error - PrimeReact Autocomplete suggestions not showing

https://primefaces.org/primereact/showcase/#/autocomplete I am trying to load suggestions dropdown as soon as component loads with some data in componentDidMount. The suggestionsList is updating with the obj data in componentDidMount, however…
Mahi
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React, tagify maxTags not updating

In my react app, I have a tagify bar. The maxTags property depends on user input. I currently have so far: import React, { useRef, useState, useEffect } from 'react'; import { useSelector, useDispatch } from 'react-redux'; import Tags from…
LTM
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React Hook useCallback not getting updated state when invoked

I am developing this application where I double click the page and create a new item. Then I notify a websockets server to broadcast this creation to all other users listening to it. On the other user end I must add this new item, so everybody gets…
Victor Ferreira
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Call order of the React life cycle componentWillUnmount

I have some questions... why do we have such sequences of the componentWillUnmount? from parent to its children. is it possible to reverse and bubble it? from children to their parent? CodeSandbox import React from "react"; import ReactDOM from…
DZMITRY ASTRAUKH
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How can we stop repeated calls in componentDidUpdate() lifecycle of a class based component, like we do in useEffect hook?

useEffect(()=>{ fetch(`${BASE_URL}/requested_url`) .then(response => response.json()) .then(json => setData(json)) }, []); When I used a class based component, I had to use a state boolean to specify when…
Yash Datir
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How many times render will actually run in a React Component

I was going through React LifeCycle methods when I got stumbled on this: I got confused as I am seeing render() function to run 2 times. All I know is that any function in React Life-Cycle runs only once. So, why am I seening 2 render functions…
Deadpool
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How would you implement shouldComponentUpdate using useEffect in React?

I was reading the React docs and it recommended if you had some props that would be changed frequently, a good life cycle method to use would be shouldComponentUpdate. My question is how would you use the useEffect approach with a functional…
Antonio Pavicevac-Ortiz
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