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://fb.me/react-with-addons-15.0.1.js"></script>
<script src="https://fb.me/react-dom-15.0.1.js"></script>
<script src="https://facebook.github.io/react/js/jsfiddle-integration-babel.js"></script>

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

CSS

.example-enter {
 opacity: 0.01;
}

.example-enter.example-enter-active {
  opacity: 1;
  transition: opacity 500ms ease-in;
}

.example-leave {
  opacity: 1;
}

.example-leave.example-leave-active {
  opacity: 0.01;
  transition: opacity 500ms ease-in;
}

JavaScript 1.7

var ReactCSSTransitionGroup = React.addons.CSSTransitionGroup;

var ListItem = React.createClass({
	render: function(){
    console.log(this.props);
  	return (
    	<ReactCSSTransitionGroup transitionName="example" transitionEnterTimeout={ 500 } transitionLeaveTimeout={ 500 } component="div" data-key={ this.props.mykey }>
    		<div>This text is { this.props.text }</div>
      </ReactCSSTransitionGroup>
    );
  }
});

var ListWrapper = React.createClass({
	 getInitialState: function() {
    return {items: ['hello', 'world', 'click', 'me']};
  },
	render: function(){
    return (
    	<div>
        { this.state.items.map(function(text, index){
          return (<ListItem mykey={ index } text={ text } />);
        })}
      </div>
    );
  }
});

ReactDOM.render(<ListWrapper />, document.getElementById("container"));