component did update arguments
componentDidUpdate(prevProps, prevState) {
// only update chart if the data has changed
if (prevProps.data !== this.props.data) {
this.chart = c3.load({
data: this.props.data
});
}
}component did update arguments
componentDidUpdate(prevProps, prevState) {
// only update chart if the data has changed
if (prevProps.data !== this.props.data) {
this.chart = c3.load({
data: this.props.data
});
}
}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;componentDidUpdate
componentDidUpdate(prevProps, prevState) {
if (prevState.pokemons !== this.state.pokemons) {
console.log('pokemons state has changed.')
}
}componentdidmount
import React, { Component } from 'react';
class App extends Component {
constructor(props){
super(props);
this.state = {
data: 'Jordan Belfort'
}
}
getData(){
setTimeout(() => {
console.log('Our data is fetched');
this.setState({
data: 'Hello WallStreet'
})
}, 1000)
}
componentDidMount(){
this.getData();
}
render() {
return(
<div>
{this.state.data}
</div>
)
}
}
export default App;USE OF COMPONENTDIDMOUNT()
// good place to call setState here
componentDidMount(){
this.setState({
message: 'i got changed',
});
}
---
// or to make request to the server
componentDidMount() {
fetch('https://api.mydomain.com')
.then(response => response.json())
.then(data => this.setState({ message: data.message }));
}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>
);
}
}Copyright © 2021 Codeinu
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