“React Component” Kod odpowiedzi

React Component Component 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;
Open Owl

ComponentDidUpdate

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

powinien componentUpdate

shouldComponentUpdate(nextProps, nextState) {
  return true;
}
Salo Hopeless

Lifecycles If ReactJs

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

  componentDidMount() {  }
  componentWillUnmount() {  }
  render() {
    return (
      <div>
        <h1>Hello, world!</h1>
        <h2>It is {this.state.date.toLocaleTimeString()}.</h2>
      </div>
    );
  }
}
Tired Turkey

React Component

import React from 'react';
import ReactDOM from 'react-dom';
 
class MyComponentClass extends React.Component {
  render() {
    return <h1>Hello world</h1>;
  }
}
 
ReactDOM.render(
    <MyComponentClass />, 
    document.getElementById('app')
);
Anthony Smith

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