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getDerivedStateFromProps Detailed explanation

Popularity:911 ℃/2025-02-11 11:18:31
import React, { useId } from 'react'; import ReactDOM from 'react-dom/client'; import './'; import App from './App'; import reportWebVitals from './reportWebVitals'; //import PagerContainer from './components/PagerContainer'; import CheckBoxGroup from './components/common/CheckBoxGroup'; const root = (('root')); class Test1 extends { constructor(props) { super(props); this.state = { count: 0 } } render(){ return ( <div> <h1 onClick={()=>this.setState((state)=>({count:+1}))}> Parent: {this.}</h1> <Test2 num={this.} /> </div> ) } } class Test2 extends { //Set the data of the initial state from the props attribute of the parent component state = { count: this. } constructor(props) { super(props); } static getDerivedStateFromProps(props, state) { ('Initial rendering and active update phases are executed') (props, state); return { count: } } componentDidMount(){ } render() { return ( <div> <h1 onClick={()=>this.setState((state)=>({count:+1}))}>This is the child component: {this.}</h1> </div> ) } } (<Test1 />); // If you want to start measuring performance in your app, pass a function // to log results (for example: reportWebVitals()) // or send to an analytics endpoint. Learn more: /CRA-vitals reportWebVitals();