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Questions tagged [react-lifecycle]

313 questions
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What is the React Hooks lifecycle for useEffect, useState, and useContext for multiple components?

TLDR: My problem is: useState in the context is not re-rendering in time for useContext from another component to get the updated state values. If you don't want to read the full explanation, a brief explanation of the 3 hooks in different…
Jpark9061
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How to reduce duplicative calls to callback functions in componentDidUpdate

I am relatively new to React and Firebase. I read several posts about how cumbersome it is to deal with asynchronous functions that return promises or take in callbacks, and there are very few ways I know of for the final output to show “correctly”.…
Prashin Jeevaganth
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Update area-label of react-calendar for specific date

I have an array of objects. [ { "date":"3 June 2020", "event":"5" }, { "date":"13 June 2020", "event":"3" } ] Now what I want is when the calendar gets renders, a span element will be appended just below the aria-label of date matches with this…
Pranay kumar
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override existing objects when push into an array - replace or add

suppose we try to connect web socket. web socket server sends some data for fetching client status which represents the online or offline. I tried to store these data into redux (works fine), but I need to change these statuses instantly with…
Amin Azimi
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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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Function generating data according to state value not changing after first render

I am creating a Login and Register screen and I want the use to have an option to choose to register with email or phone number. I am using a radio button for this, and for some reason the function does not change its render when I change the…
tolypash
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Why is componentWillMount(), componentWillUpdate() and other lifecycle methods in React unsafe?

I can see that componentWillMount() can be unneeded, but how is it "unsafe"?
Jeremy L
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How to avoid using setState in shouldComponentUpdate() in React?

I created a React component for a forum view. Source code can be seen: https://github.com/WayneHo25/YeePlus/blob/forum-feature/frontend/src/views/ForumPage/Sections/SectionPills.jsx There are some tabs in the tops for several different forums. …
Wayne Ho
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What is the new version of `componentWillReceiveProps(nextProps, nextContext)`?

I'm using this lifecycle method componentWillReceiveProps(nextProps, nextContext), but I'm aware that this is a legacy method. I tried to refactor it with static getDerivedStateFromProps(nextProps, nextContext), and find out that I can't access the…
Chloe Sun
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Why is it prohibited to fetch data from API in constructor of a React Component

I've researched this question and it appears that fetching data in the constructor of a React component may cause some troubles. Can someone explain me what kind of troubles are those. Preferably with examples. what's the difference between fetching…
Asman Umbetov
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Regarding LifeCycles in ReactJS / Problem in the code snippet

I'm trying to learn ReactJS and found out about these lifecycles. However I've a doubt regarding how componentDidUpdate() functions and I want to know the reason behind it. Please take a look at the code below. It is a simple code that calculates…
Divyam Dhadwal
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Component renders 4 times in console.log

First, thanks for reading me. I'm working on react-native using Expo. I set up functions in my app using componentWillMount and componentDidMount. It's working, ok but I have difficulties understanding why my component renders 4 times... I get this…
Kimako
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How to replace useEffect with componentDidMount if we call a callback function inside componentDidMount?

by using useEffect, my array state variable did not append the previous value, but componentDidMount did I console.log out the message when using the useEffect, and all the message were correctedly printed out, but the state wasn't stored, if I set…
impressiveHen
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React update child component state from parent using getDerivedStateFromProps

Am new to React, I like to maintain state in parent component itself and pass the same to all child components on child component I would like to update the child state from the parent component state am using getDerivedStateFromProps to update it.…
Kannan T
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How do I stop the parent from completely re-rendering but still have the child re-render based on a change in "state'?

I have a typical customer form that I want the user to review before they submit their information. My thoughts are to have the user click a "submit information" button at the bottom of the form which brings up a pop-up window that summarizes the…
Rafael C
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