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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 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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Where should I utilize useEffect in my HOC which is receiving props in React?

I have this higher order function: Its a supposed to render a based on some props which I am using in conditionals to render my element. function GenericIsUserLoggedInLink({ isLoggedIn, logOutUser, route, anchorText }) { if (isLoggedIn) { if…
Antonio Pavicevac-Ortiz
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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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Why is this.value undefined/null on every lifecycle hook when using [ngModel]="true"

I have a custom form control which implements ControlValueAccessor to handle [(formControl)]="..." and [(ngModel)]="...". @Component({ selector: 'app-foo', templateUrl: './foo.component.html', styleUrls: ['./foo.component.css'], providers:…
DerZyklop
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weird question about shouldComponentUpdate()

I don't understand how shouldComponentUpdate() method has access to old state, As i know, shouldComponentUpdate() is fired after props or state changes. Suppose you call setState() , After that the current state will be changed and will be update…
dmcshehan
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struggling to understand componentDidMount() method when it comes to nested components

I'm trying to understand react lifecycle hooks and have faced a problem with componentDidMount() lifecycle hook. Suppose you are rendering a list of components. componentDidMount() method for each list item is always fired at the end after all list…
dmcshehan
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How to call an async function in textinput?

How to call an async function with in textinput? getTxt = async () => { filetxt = 'abc'; currentFileName = this.props.navigation.getParam("currentFileName"); console.log(currentFileName); try { filetxt =…
hkguile
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Mounting & Unmounting Process in functional components

I have the following Components and I am confused on how the mounting and unmounting actually works in react/react-native. const App = ()=>{ return ( ) } const…
JustDev
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restart animation on tab click

i'm new to react development i'm creating 2 tab using Navs and tabs to display data retrieved from api in cards ..i'm trying to restart animation made by framer-motion to the tab content on tab-click but it animate once only, i think the answer is…
R.cs
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Component is rendering before unmounting

I have been working on a project, and I want a div ID before unmounting it. I tried using the below code: useEffect(()=> return()=>getId ),[state]) but the div was set to null before it came to useEffect. To figure it out, I wrote an example…
AMRITESH GUPTA
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ReactJs: How to execute a function that depends on the result of a setState that's called inside componentDidUpdate

I have this class that loads messages for different conversations: export class Messages extends Component { constructor() { super(); this.state = { page: 0, results_per_page: 10, messages: [], }; …
AG_HIHI
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React componentDidMount vs useEffect hooks for API call

When I am trying to make an API call using in useEffect hook (before the component did mount), somehow the state is not getting updated, hence I am getting an error Cannot read property of undefined. But if I am converting the same logic to a Class…
Lekheshwar B
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Which strategy to use when displaying a value on the screen that comes from a useState hook of React and not re render unless under an action?

I have a report generated by three parameters. An user and 2 range date fields. e.g: When all fields are filled, the report can be generated by Gerar button. e.g when generated: The problem i don't know how to handle happens now. When a value of…
RAFAEL DA SILVA
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ReactJS component useeffect hooks call every time parents get updated

I have a parent component. function ParentComponent(){ return ( //loading is asynchronous variable which changes on some event call. {loading ? ( ): (
Some text...
)} …
Nibir Alam
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React Native detect when user is trying to quit the app?

I want to update my redux state based on the component unmount but in case a user terminates the app how to detect that and update my redux state based on the app termination as the componentWillUnmount will not be called in case of quitting the…
Prince Mittal
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