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how does did componentmount work

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Open Osprey answered on July 14, 2021 Popularity 10/10 Helpfulness 2/10

answer how does did componentmount work

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how does did componentmount work

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    class Example extends React.Component {
        componentWillMount() {
            console.log('I am about to say hello');
        }

        render() {
            return <h1>Hello world</h1>;
        }
    }

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: blog.pusher.com

Tags: javascript

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Contributed on Jul 14 2021

Open Osprey

0 Answers Avg Quality 2/10

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componentWillUnmount

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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>Bonjour, monde !</h1>
        <h2>Il est {this.state.date.toLocaleTimeString()}.</h2>
      </div>
    );
  }
}

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

Popularity 10/10 Helpfulness 4/10 Language javascript

Source: fr.reactjs.org

Tags: javascript j

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Contributed on Sep 02 2021

Poor Petrel

0 Answers Avg Quality 2/10

component will unmount

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import React from 'react';
class ComponentOne extends React.Component {
 
  // Defining the componentWillUnmount method
  componentWillUnmount() {
    alert('The component is going to be unmounted');
  }
 
  render() {
    return <h1>Hello Geeks!</h1>;
  }
}
 
class App extends React.Component {
  state = { display: true };
  delete = () => {
    this.setState({ display: false });
  };
 
  render() {
    let comp;
    if (this.state.display) {
      comp = <ComponentOne />;
    }
    return (
      <div>
        {comp}
        <button onClick={this.delete}>
          Delete the component
        </button>
      </div>
    );
  }
}
 
export default App;

Popularity 10/10 Helpfulness 4/10 Language javascript

Source: www.geeksforgeeks.org

Tags: javascript j

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Contributed on Mar 08 2022

Shumail Mehmood

0 Answers Avg Quality 2/10

how does did componentmount work

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