React Base Fiddle (JSX)

Starting point for creating JSFiddles with React. This uses React with Addons.

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/babel-core/5.8.24/browser.js"></script>
<script src="https://npmcdn.com/react@latest/dist/react-with-addons.js"></script>
<script src="https://npmcdn.com/react-dom@latest/dist/react-dom.js"></script>
<script src="https://facebook.github.io/react/js/jsfiddle-integration-babel.js"></script>

<div id="container">
    <!-- This element's contents will be replaced with your component. -->
</div>

JavaScript 1.7

class App extends React.Component {
    constructor() {
        super();
        this.my_refs = {};
        this.focusByID.bind(this);
    }

    focusByID(id){
        let myRef = this.my_refs[id];
        if(myRef){
            console.log('focusing on ', id, myRef);
            myRef.focus();
        }
    }
    render() {
        return (
            <div>
                <div
                    id="bigRedDiv"
                    style={{height : 200, width : 200, backgroundColor : 'red'}}
                    ref={(input) => this.my_refs['bigRedDiv'] = input }
                    onFocus={() => console.log('FOCUS IS ON BIG RED DIV')}
                    onClick={() => this.focusByID('bigRedDiv')}
                >
                </div>
            </div>
        );
    }
}

ReactDOM.render(
  <App />,
  document.getElementById('container')
);