React Component

How to create component in reactjs

class Car extends React.Component {
  render() {
    return <h2>Hi, I am a Car!</h2>;
  }
}

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;

Source: reactjs.org

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>
    );
  }
}

Source: reactjs.org

Shouldcomponentupdate

shouldComponentUpdate(nextProps, nextState) {
  return true;
}

Source: reactjs.org

ComponentDidUpdate

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

Source: dev.to

React Component

A React Component is one of the core building blocks of React Apps. In other words, we can say that every application you will develop in React will be made up of pieces called components. Components make the task of building UIs much easier

-2

Source: reactjs.org

Similar codes

1 vote308 views1 answer
How to define state in react function
Javascript React
0 vote332 views1 answer
Scroll to a input on button click react native
Javascript React
24 votes322 views5 answers
How to change port in react js
Javascript React
3 votes302 views1 answer
React on hover reveal
Javascript React
0 vote343 views2 answers
React native bordered image drop with shadow fix
Javascript React
4 votes373 views1 answer
Full width of image and maintain aspect ratio react native
Javascript React
1 vote336 views2 answers
How to use gif in react native
Javascript React
0 vote357 views1 answer
Filter based on input typing react
Javascript React
0 vote295 views1 answer
React open on different url instead of localhost
Javascript React
0 vote349 views1 answer
React native typescript nodejs timeout
Javascript React