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/react/0.13.1/react-with-addons.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/0.13.1/JSXTransformer.js"></script>
<script src="https://facebook.github.io/react/js/jsfiddle-integration.js"></script>
<script src="https://rawgit.com/react-bootstrap/react-bootstrap-bower/master/react-bootstrap.min.js"></script>
<div id="container">
    <!-- This element's contents will be replaced with your component. -->
</div>

JavaScript 1.7

var DropdownButton = ReactBootstrap.DropdownButton;
var MenuItem = ReactBootstrap.MenuItem;

var Hello = React.createClass ({
    getInitialState() { 
        return { key: null }
    },
    
    onSelect(key) {
        this.setState({ key: key });
    },
    
    render() {
        var selected = this.state.key ? <p>Selected: {this.state.key}</p> : '';
        return (<div>
        <DropdownButton bsStyle="primary" title="Test" onSelect={this.onSelect}>
          <MenuItem eventKey='1' active={this.state.key==='1'}>Action</MenuItem>
          <MenuItem eventKey='2' active={this.state.key==='2'}>Another action</MenuItem>
          <MenuItem eventKey='3' active={this.state.key==='3'}>Active Item</MenuItem>
          <MenuItem divider />
          <MenuItem divider />
          <MenuItem eventKey='4' active={this.state.key==='4'}>Separated link</MenuItem>
        </DropdownButton>
        {selected}
        </div>);
    }
});
 
React.render(<Hello/>, document.getElementById('container'));