title: Reactjs Browser Tab Close Event
body: <p>Hi I want to know how to prompt a message on browser tab close.
  I am using Reactjs.</p>
  
  <pre><code>handleWindowClose(){
      alert("Alerted Browser Close");
  },
  componentDidMount: function() {
      window.addEventListener('onbeforeunload', this.handleWindowClose);
  },
  
  componentWillUnmount: function() {
      window.removeEventListener('onbeforeunload', this.handleWindowClose);
  }
  </code></pre>
  
  <p>this is what I have tried adding to my react component.Please guide me on how to proceed further.</p>