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);
}

Tags:

Misc Example