componentDidUpdate
componentDidUpdate(prevProps, prevState) {
if (prevState.pokemons !== this.state.pokemons) {
console.log('pokemons state has changed.')
}
}componentDidUpdate
componentDidUpdate(prevProps, prevState) {
if (prevState.pokemons !== this.state.pokemons) {
console.log('pokemons state has changed.')
}
}react native componentwillmount vs componentdidmount
The best place to make calls to fetch data is within componentDidMount().
componentDidMount() is only called once, on the client, compared to
componentWillMount() which is called twice, once to the server and
once on the client. It is called after the initial render when the
client received data from the server and before the data is displayed
in the browser.shouldcomponentupdate
shouldComponentUpdate(nextProps, nextState) {
return true;
}react lifecycle example
class Test extends React.Component {
constructor() {
console.log('Constructor')
super();
this.state = {
count: 0
};
}
componentDidMount() {
console.log("component did mount");
}
componentDidUpdate() {
console.log("component did update");
}
onClick = () => {
this.setState({ count: this.state.count + 1 });
};
render() {
console.log("render");
return (
<div>
Hello Test
<button onClick={this.onClick}>
{this.state.count}
</button>
</div>
);
}
}
//--for first time
//Constructor
//render
//component did mount
//--for any update
//render
//component did updatecomponent did mmount
componentDidUpdate(prevProps, prevState, snapshot)Copyright © 2021 Codeinu
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