Answers for "component unmount"

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react native class component constructor

import React from 'react';  
import { View, TextInput } from "react-native";

class App extends React.Component {  
  constructor(props){  
    super(props);  
    this.state = {  
         name: "" 
      }  
    this.handleChange = this.handleChange.bind(this);  
  }
  handleChange(text){
    this.setState({ name: text })
    console.log(this.props);  
  }  
  render() {  
    return (  
    <View>
      <TextInput 
      	value={this.state.name} 
  		onChangeText={(text) =>this.handleChange(text)}
      />
    </View>  
  }  
}  
export default App;

Posted by: Guest on August-28-2020

Source

componentDidUpdate

componentDidUpdate(prevProps, prevState) {
  if (prevState.pokemons !== this.state.pokemons) {
    console.log('pokemons state has changed.')
  }
}

Posted by: Guest on November-10-2020

Source

componentWillUnmount

class Clock extends React.Component {
  constructor(props) {
    super(props);
    this.state = {date: new Date()};
  }

  componentDidMount() {
    this.timerID = setInterval(
      () => this.tick(),
      1000
    );
  }

  componentWillUnmount() {
    clearInterval(this.timerID);
  }

  tick() {    this.setState({      date: new Date()    });  }
  render() {
    return (
      <div>
        <h1>Bonjour, monde !</h1>
        <h2>Il est {this.state.date.toLocaleTimeString()}.</h2>
      </div>
    );
  }
}

ReactDOM.render(
  <Clock />,
  document.getElementById('root')
);

Posted by: Guest on September-02-2021

Source

shouldcomponentupdate

shouldComponentUpdate(nextProps, nextState) {
  return true;
}

Posted by: Guest on June-08-2020

Source

how does did componentmount work

class Example extends React.Component {
        componentWillMount() {
            console.log('I am about to say hello');
        }

        render() {
            return <h1>Hello world</h1>;
        }
    }

Posted by: Guest on July-14-2021

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