Key handling.js

import React from 'react';

const MyComponent = React.createClass({
  render() {
    return (
      <h1>My Component</h1>
    )
  },
  
  keyHandling: function(e) {
    // Handle event
    console.log("Key code: " + e.keyCode);
  },
  
  componentDidMount: function() {
    // Add Event Listener on compenent mount
    window.addEventListener("keyup", this.keyHandling);
  },
  
  componentWillUnmount: function() {
    // Remove event listener on compenent unmount
    window.removeEventListener("keyup", this.keyHandling);
  }
});