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.')
}
}componentdidupdate in hooks
const App = props => {
const didMountRef = useRef(false)
useEffect(() => {
if (didMountRef.current) {
doStuff()
} else didMountRef.current = true
}
}shouldcomponentupdate
shouldComponentUpdate(nextProps, nextState) {
return true;
}prev props
componentDidUpdate(prevProps) {
// Utilisation classique (pensez bien à comparer les props) :
if (this.props.userID !== prevProps.userID) {
this.fetchData(this.props.userID);
}
}Copyright © 2021 Codeinu
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