example.js

import React from 'react';
import BeforeUnloadComponent from 'react-beforeunload-component';
// React Hook
const Example = () => {
    
    return (
      <div>
        <BeforeUnloadComponent
            blockRoute={true}               
        /> 
            <form> ... </form>
        <BeforeUnloadComponent />
      </div>
    );
}