react oncomponentupdate code example
Example 1: 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 2: component did mmount
componentDidMount()
Example 3: react lifecycle
constructor(props) {
super(props);
// Don't call this.setState() here!
this.state = { counter: 0 };
this.handleClick = this.handleClick.bind(this);
}