The componentDidMount Method -
The componentDidMount method is called after the component is rendered.
The componentDidMount method is called exactly once and when The component has been initialized.
Explore to Understand - React Lifecycle Components
The componentDidMount method is used for -
1. Handling the AJAX requests - GET/POST/PUT/DELETE
2. Set timers using setTimeout or setInterval
3. Set timers using setInterval
As an Example,
public class Header extends React.Component {
constructor(props) {
super(props);
this.state = {msg: "welcome!"};
}
componentDidMount() {
setTimeout(() => {
this.setState({msg: "welcome you Anil"})
}, 1000)
}
render() {
return (
<h2>{this.state.msg}</h2>
);
}
}