Stack Overflow
Stack Overflow

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

71 questions
0
votes
1 answer

Detect navigation changes

I have a react native App. I'll like to detect navigation to screens, so when I navigate to a specific screen I trigger a update function. I have the componentDidMount but works only when navigating for the first time... Also have looked at AppState…
Marco Martin
  • 185
  • 1
  • 4
  • 18
0
votes
0 answers

Naker.back with React

Naker.Back Documentations I came across an article that uses Naker.back to make interactive backgrounds so I decided to give it a try in my portfolio website that I plan on using MERN stack to build. I was planning to use my interactive background…
Lee Ren Jie
  • 55
  • 1
  • 8
0
votes
2 answers

Issue Converting react class components to functional components with state is undefined

Can life cycles be used in Arrow functions using componentDidMount() and having an error my only response I tried to add a useEffect ? Trying to Converting class components to functional components. I created a contentful blog in a separate project…
concepttech
  • 17
  • 2
  • 9
0
votes
2 answers

I want the combined functioanlity of ComponentDidMount and ComponentDidUpdate in React js

I am fetching API data using axios and that API has query parameter (e.g.: searchQuery, which is defined in state). I have declared it's initial value in state and axios call in componentDidUpdate. Now I want my user to input the data in the form…
Umar Javed
  • 55
  • 8
0
votes
0 answers

componentDidUpdate(prevProps) is not being called

**I'll post the code first and then explain what's the issue I'm getting later. class ParentComponent extends Component { constructor() { super() this.state = { id: null, } } render() { const dataTarged = "#col" + id …
kivul
  • 1,148
  • 13
  • 28
0
votes
1 answer

React Native - how do I trigger a function based off a change in a reducer value?

I have a question about how to trigger a function in one component on the change of a reducer value from a different component. I currently have a function in my Home component that runs in ComponentDidMount. If my value this.props.reducer.run is…
LoF10
  • 1,907
  • 1
  • 23
  • 64
0
votes
1 answer

Which life cycle method is preferred when using redux and react hooks?

In the edit page, by redux useSelector method data available to the component but it is not setting initial values. How to set it? How to set the initial formData from the store? In hook component rendering happens 4 times why? import…
Harishbn
  • 97
  • 9
0
votes
1 answer

Drawer navigator screens strange behavior

I'm using react-navigation v5 in my expo managed workflow project and the thing that I noticed is that every second time I visit a screen that is attached to a drawer navigator, lifecycle methods are not being invoked... Here is the example: -…
mSenad
  • 133
  • 1
  • 9
0
votes
0 answers

Can you replicate static setDerivedStateFromProps with useEffect in Functional Component (React)?

I'm reading a book for React (beginner book) and I'm not quite sure how to replicate this lifecycle static function setDerivedStateFromProps This is the code with a class approach (but I need this with functional approach): public static…
Nikolai
  • 555
  • 7
  • 17
0
votes
2 answers

redux props receiving data twice

I am using redux to get the async data and response. In the below component when i post recipe and from server i get response through redux the success modal popup twice. reducer is running only once i have checked eveything, only component has…
devesh
  • 111
  • 2
  • 11
0
votes
0 answers

does the state's changes with multiple this.setState calls are aggregated?

Theoretically, I know that the state's changes in the hook setState are aggregated, i.e if I'll call it multiple times in the same function, the state's changes will be collected, and then the state will be changed only once. Is this is the case for…
Yoav Abadi
  • 403
  • 7
  • 16
0
votes
0 answers

How to fetch data in react with redux

i dont understand why i get at first undefined and after that i get correct data, also because i get undefined in componentDidMount() i am not able to collect data here so if someone know how to solve this problem please help me, also i use…
jaytheduke40
  • 1
0
votes
1 answer

React Lifecycle- The plot is drawn using the initial state value, and not using the fetched value

I want to fetch the value of the variable 'r2score' from flask. The value is fetched successfully. I even wote a console.log(r2score) statement to see if the fetching works. Here's the problem. Initially it logged a value of 0.1, which is its…
smit shah
  • 19
  • 4
0
votes
1 answer

setState of child component only when it is called

i have a parent component and i have called the child component in its HTML like this. render() {
Shoaib Iqbal
  • 2,420
  • 4
  • 26
  • 51
0
votes
2 answers

How to update props dependent state

I have component connected to redux store which gets data from props: const mapStateToProps = state => ({rowData: dataSelector(state)}) The component has its own state: this.state = { rowsPerPage: 23, pageCount: 0, } I need to calculate new…
Дядя Фея
  • 359
  • 2
  • 12
1 2 3
4
5