/Javascript/React/React tutorial componentDidMount() componentWillUnmount()

React tutorial componentDidMount() componentWillUnmount()

class Clock extends React.Component {
  constructor(props) {
    super(props);
    this.state = {date: new Date()};
  }

  componentDidMount() {
    this.timerID = setInterval(
      () => this.tick(),
      1000
    );
  }

  componentWillUnmount() {
    clearInterval(this.timerID);
  }

  tick() {
    this.setState({
      date: new Date()
    });
  }

  render() {
    return (
      <div>
        <h1>Hello, world!</h1>
        <h2>It is {this.state.date.toLocaleTimeString()}.</h2>
      </div>
    );
  }
}

ReactDOM.render(
  <Clock />,
  document.getElementById('root')
);

Source: reactjs.org

Similar codes

0 vote196 views2 answers
React native bottom sheet example
Javascript React
5 votes204 views3 answers
Linear gradient react js
Javascript React
3 votes320 views3 answers
Center horizontally react native
Javascript React
17 votes204 views5 answers
How to run react native app
Javascript React
0 vote191 views1 answer
Update an object key value in state react
Javascript React
0 vote194 views1 answer
React native run real device
Javascript React
0 vote199 views1 answer
React js error stackoverflaw
Javascript React
23 votes234 views3 answers
React save to local storage
Javascript React
2 votes193 views1 answer
How to make react router Link active
Javascript React
1 vote191 views1 answer
Font awesome react native icons
Javascript React