[React] React Fundamentals: Build a JSX Live Compiler

we want to have the ability to write JSX and see the output live in the browser.

<!doctype html>
<html lang="en">
<head>
    <link href="//netdna.bootstrapcdn.com/bootstrap/3.1.0/css/bootstrap.min.css" rel="stylesheet" type="text/css" />
    <link rel="stylesheet" href="style.css"/>
    <script src="//fb.me/react-0.13.3.js"></script>
    <script src="//fb.me/JSXTransformer-0.13.3.js"></script>
    <meta charset="utf-8">
    <title>Compiler</title>
</head>
<body>
<script type="text/jsx">
    /** @jsx React.DOM */

    var App = React.createClass({
        getInitialState: function() {
            return {
                input: '',
                output: '',
                err: ''
            }
        },
        update: function(e) {
            try{
                var input = this.refs.htmlCode.getDOMNode().value;
                this.setState({
                    output: JSXTransformer.transform(input).code,
                    err: ''
                })
            }catch(err){
                this.setState({
                    err: err.message
                })
            }
        },
        render: function() {
            return (
                    <div className="container">
                        <div className="row">
                            <div className="alert alert-danger">
                                &nbsp;{this.state.err}
                            </div>
                        </div>
                        <div className="row">
                            <textarea type="text" className="col-md-6 input-lg"
                                      ref="htmlCode"
                                      defaultValue={this.state.input} onChange={this.update}></textarea>
                            <pre className="col-md-6 input-lg">{this.state.output}</pre>
                        </div>
                    </div>
            )
        }
    });

    React.render(<App />, document.body);
</script>
</body>
</html>