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/JSXTransformer.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/0.13.1/react-with-addons.js"></script>
<script src="https://facebook.github.io/react/js/jsfiddle-integration.js"></script>

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

CSS

.green {
    background-color: lightgreen;
}

.blue {
    background-color: lightblue;
}

JavaScript 1.7

var Hello = React.createClass({
    getInitialState: function(){
        return {
            color: 'blue'
        };
    },
    handleClick: function(){
        if (this.state.color === 'blue'){
            this.setState({color: 'green'});
        } else {
            this.setState({color: 'blue'});
        }
    },
    render: function() {
        return (
        <div>
        <button className={this.state.color} onClick={this.handleClick}>My background is: {this.state.color}, Click me to change</button>;
        <div>
        )
    }
});
 
React.render(<Hello name="World" />, document.getElementById('container'));