life cycle of a component in react code example
Example 1: lifecycle method react
INITIALIZATION= setup props and state
MOUNTING= constructor->componentWillMount->render->componentDidMount//Birth
UPDATE= shouldComponentUpdate->componentWillUpdate->render
->componentDidUpdate //Growth
UNMOUNTING= componentWillUnmount //Death
Example 2: Component life cycle
class LifeCycle extends React.Component {
constructor(props)
{
super(props);
this.state = {
date : new Date(),
clickedStatus: false,
list:[]
};
}
componentWillMount() {
console.log('Component will mount!')
}
componentDidMount() {
console.log('Component did mount!')
this.getList();
}
getList=()=>{
/*** method to make api call***
fetch('https://api.mydomain.com')
.then(response => response.json())
.then(data => this.setState({ list:data }));
}
shouldComponentUpdate(nextProps, nextState){
return this.state.list!==nextState.list
}
componentWillUpdate(nextProps, nextState) {
console.log('Component will update!');
}
componentDidUpdate(prevProps, prevState) {
console.log('Component did update!')
}
render() {
return (
<div>
<h3>Hello Mounting Lifecycle Methods!</h3>
</div>
);
}
}