react constructor code example
Example 1: 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 (
this.handleChange(text)}
/>
}
}
export default App;
Example 2: constructor react
constructor(props) {
super(props);
// Don't call this.setState() here!
this.state = { counter: 0 };
this.handleClick = this.handleClick.bind(this);
}
Example 3: lifecycles if reactjs
class Clock extends React.Component {
constructor(props) {
super(props);
this.state = {date: new Date()};
}
componentDidMount() { }
componentWillUnmount() { }
render() {
return (
Hello, world!
It is {this.state.date.toLocaleTimeString()}.
);
}
}
Example 4: shouldcomponentupdate
shouldComponentUpdate(nextProps, nextState) {
return true;
}
Example 5: component did mmount
componentDidMount()
Example 6: component did mmount
componentDidUpdate(prevProps, prevState, snapshot)