I have a ponent like:

import React, { PropTypes, Component } from 'react'


class MyView extends Component {

    ponentDidMount() {
        window.addEventListener('onbeforeunload', this.saveState())
    }

    ponentWillUnmount() {
        window.removeEventListener('beforeunload', this.saveState())
    }

    saveState() {
        alert("exiting")
    }

    render() {

        return (
            <div>
                Something
            </div>
        )
    }

}

export default MyView

Here when a user refresh the page I want to call a specific funtion and when call is finished I want the page to be refreshed. Same when user closes the page.

In my above code I am adding an event listener onbeforeunload and calling a saveState function.

But here my ponentDidMount is working normally. onbeforeunload and saveState function is called normally when page is loaded not when page is refreshed or exited.

What is wrong in here and how can I call specific funcitn or give alert when someone exits or refresh the page in react ?

In the above code

I have a ponent like:

import React, { PropTypes, Component } from 'react'


class MyView extends Component {

    ponentDidMount() {
        window.addEventListener('onbeforeunload', this.saveState())
    }

    ponentWillUnmount() {
        window.removeEventListener('beforeunload', this.saveState())
    }

    saveState() {
        alert("exiting")
    }

    render() {

        return (
            <div>
                Something
            </div>
        )
    }

}

export default MyView

Here when a user refresh the page I want to call a specific funtion and when call is finished I want the page to be refreshed. Same when user closes the page.

In my above code I am adding an event listener onbeforeunload and calling a saveState function.

But here my ponentDidMount is working normally. onbeforeunload and saveState function is called normally when page is loaded not when page is refreshed or exited.

What is wrong in here and how can I call specific funcitn or give alert when someone exits or refresh the page in react ?

In the above code

• javascript
• reactjs

• Try to remove window event listener, guess ponentWillUnmount uses window.on('beforeunload') underneath – Medet Tleukabiluly Commented Aug 22, 2016 at 5:25

2 Answers 2

Attach beforeunload event on top level ponent and on beforeunload event make render empty which will trigger ponentWillUnmount of all child ponents.

import React, { PropTypes, Component } from 'react'

class App extends Component {
    ponentDidMount() {
      window.addEventListener('beforeunload', () =>{
          this.setState({appended:true});
      });
    }
    render() {
      if(this.state.appended){
        return false;
      }else{
        return (<MyView />)
      }
    }
}


class MyView extends Component {


  ponentWillUnmount() {
    this.saveState()
  }

  saveState() {
    alert("exiting")
  }

  render() {

    return (
        <div>
            Something
        </div>
    )
  }

}

export default MyView

Hope this work for you.

According to this, try this syntax :

ponentDidMount() {
    window.addEventListener('onbeforeunload', this.saveState)
}

ponentWillUnmount() {
    window.removeEventListener('beforeunload', this.saveState)
}