Uncaught ReferenceError: ReactDOM is not defined

javascript ruby-on-rails ruby ruby-on-rails-4 reactjs

It may be the spelling issue - it is ReactDOM, not ReactDom.

This has changed over time with the new release of React

javascript ruby-on-rails ruby ruby-on-rails-4 reactjs

ReactDOM available since version 0.14.0, so you need to use React.render (because you have a React version 0.13.3) instead,

setInterval(function() {  React.render(    <HelloWorld date={new Date()} />,    document.getElementById('example')  );}, 500);

or upgrade your React version and include ReactDOM

Changes in React 0.14

javascript ruby-on-rails ruby ruby-on-rails-4 reactjs

You have to import it

import ReactDOM from 'react-dom';

CodeHunter