React Hello World Example with ES6+JSX

A basic Hello World widget with in browser JSX transformed + ES6 support

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

.border {
	border-style: solid;
}

table td {
  width:100px;
  height:100px;
  text-align:center;
  vertical-align:middle;
  background-color:#ccc;
  border:1px solid #fff;
}

table td.highlighted {
  background-color:#999;
}

JavaScript 1.7

class Hello extends React.Component {
  constructor(props) {
    this.state = {overId:null, startedId:null, enableSelect: false};
  }
  handleDown(rowId, id) {
    this.setState({overId:[rowId, id], startedId:[rowId, id], enableSelect:true});
  }
  handleUp(id) {
    this.setState({enableSelect:false});
  }
  handleOver(rowId, id) {
    if(this.state.enableSelect && (this.state.overId == null || id!=this.state.overId[0] || rowId!=this.state.overId[1])) {
      this.setState({overId:[rowId, id]});
    }
  }
  render() {
    return(
      <table>
      <tr>
          <TD id={[1,1]} overId={this.state.overId} startedId={this.state.startedId} hdown={this.handleDown.bind(this)} hup={this.handleUp.bind(this)} hover={this.handleOver.bind(this)} />
          <TD id={[1,2]} overId={this.state.overId} startedId={this.state.startedId} hdown={this.handleDown.bind(this)} hup={this.handleUp.bind(this)} hover={this.handleOver.bind(this)} />
          <TD id={[1,3]} overId={this.state.overId} startedId={this.state.startedId} hdown={this.handleDown.bind(this)} hup={this.handleUp.bind(this)} hover={this.handleOver.bind(this)} />
          <TD id={[1,4]} overId={this.state.overId} startedId={this.state.startedId} hdown={this.handleDown.bind(this)} hup={this.handleUp.bind(this)} hover={this.handleOver.bind(this)} />
      </tr>
      <tr>
          <TD id={[2,1]} overId={this.state.overId} startedId={this.state.startedId} hdown={this.handleDown.bind(this)} hup={this.handleUp.bind(this)} hover={this.handleOver.bind(this)} />
          <TD id={[2,2]} overId={this.state.overId} startedId={this.state.startedId} hdown={this.handleDown.bind(this)} hup={this.handleUp.bind(this)} hover={this.handleOver.bind(this)} />
          <TD id={[2,3]} overId={this.state.overId} startedId={this.state.startedId} hdown={this.handleDown.bind(this)} hup={this.handleUp.bind(this)} hover={this.handleOver.bind(this)} />
          <TD id={[2,4]} overId={this.state.overId} startedId={this.state.startedId}...