title: React isn't returning the value from onClick
body: <pre><code>export default class CreateMenu extends React.Component {
    constructor(props) {
      super(props);
    }
    goToStage = event =&gt; {
      console.log(event.target.value);
      if (event.target.value &lt; this.props.stage) {
        console.log('true')
      }
    };
    render() {
      return (
        &lt;div className="campaign-pagination"&gt;
          &lt;ul&gt;
              &lt;li&gt;
              &lt;span value={0} onClick={this.goToStage} className={this.props.menu.home} title="Info"&gt;
                &lt;AlignLeft /&gt;
                &lt;span className="navigation-text"&gt;1. Info&lt;/span&gt;
              &lt;/span&gt;
            &lt;/li&gt;
  </code></pre>
  
  <p>Trying to access 'event.target.value' from a span with the value set as 0.  For some reason, it only returns null. </p>