nilshartmann/getEventTarget.js

## getEventTarget.js
function getEventTarget(nativeEvent) {
  var target = nativeEvent.target || nativeEvent.srcElement || window;

    // If encapsulated in a Web Component
    // use the Event path
    if(nativeEvent.path && nativeEvent.path[0]) {
        return nativeEvent.path[0];
    }

  // Normalize SVG <use> element events #4963
  if (target.correspondingUseElement) {
    target = target.correspondingUseElement;
  }

  // Safari may fire events on text nodes (Node.TEXT_NODE is 3).
  // @see http://www.quirksmode.org/js/events_properties.html
  return target.nodeType === 3 ? target.parentNode : target;
}

## index.html
<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>Basic Example with WebComponents</title>
    <link rel="stylesheet" href="../shared/css/base.css" />
  </head>
  <body>
    <h1>Basic Example with WebComponents</h1>
    <div id="container">
      <p>
        To install React, follow the instructions on
        <a href="http://www.github.com/facebook/react/">GitHub</a>.
      </p>
      <p>
        If you can see this, React is <strong>not</strong> working right.
        If you checked out the source from GitHub make sure to run <code>grunt</code>.
      </p>
    </div>
    <br /><br />
    <h4>Example Details</h4>
    <p>
        This example demonstrates WebComponent/ReactComponent interoperability
        by rendering a ReactComponent, which renders a WebComponent, which renders
        another ReactComponent in the WebComponent's shadow DOM.
    <p>
    <p>
      Learn more about React at
      <a href="http://facebook.github.io/react" target="_blank">facebook.github.io/react</a>.
    </p>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/webcomponentsjs/0.7.21/webcomponents.js"></script>
    <script src="../../build/react.js"></script>
    <script src="../../build/react-dom.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/babel-core/5.8.24/browser.min.js"></script>

    <script type="text/babel">

     function exampleEventHandler(e) {
       console.log('Hello', e);
     }

      // Define WebComponent
      var proto = Object.create(HTMLElement.prototype, {
        attachedCallback: {
          value: function() {
            var mountPoint = document.createElement('span');
            this.createShadowRoot().appendChild(mountPoint);

            var name = this.getAttribute('name');
            ReactDOM.render(<button onClick={exampleEventHandler}>{name}</button>, mountPoint);
          }
        }
      });
      document.registerElement('x-search', {prototype: proto});

      // Define React Component
      class HelloMessage extends React.Component {
        render() {
          return <div>Hello <x-search name={this.props.name} />!</div>;
        }
      }

      // Mount React Component (which uses WebComponent which uses React)
      var container = document.getElementById('container');
      ReactDOM.render(<HelloMessage name="Jim Sproch" />, container);
    </script>
  </body>
</html>
	function getEventTarget(nativeEvent) {
	var target = nativeEvent.target \|\| nativeEvent.srcElement \|\| window;

	// If encapsulated in a Web Component
	// use the Event path
	if(nativeEvent.path && nativeEvent.path[0]) {
	return nativeEvent.path[0];
	}

	// Normalize SVG <use> element events #4963
	if (target.correspondingUseElement) {
	target = target.correspondingUseElement;
	}

	// Safari may fire events on text nodes (Node.TEXT_NODE is 3).
	// @see http://www.quirksmode.org/js/events_properties.html
	return target.nodeType === 3 ? target.parentNode : target;
	}
	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="utf-8">
	<title>Basic Example with WebComponents</title>
	<link rel="stylesheet" href="../shared/css/base.css" />
	</head>
	<body>
	<h1>Basic Example with WebComponents</h1>
	<div id="container">
	<p>
	To install React, follow the instructions on
	<a href="http://www.github.com/facebook/react/">GitHub</a>.
	</p>
	<p>
	If you can see this, React is <strong>not</strong> working right.
	If you checked out the source from GitHub make sure to run <code>grunt</code>.
	</p>
	</div>
	<br /><br />
	<h4>Example Details</h4>
	<p>
	This example demonstrates WebComponent/ReactComponent interoperability
	by rendering a ReactComponent, which renders a WebComponent, which renders
	another ReactComponent in the WebComponent's shadow DOM.
	<p>
	<p>
	Learn more about React at
	<a href="http://facebook.github.io/react" target="_blank">facebook.github.io/react</a>.
	</p>
	<script src="https://cdnjs.cloudflare.com/ajax/libs/webcomponentsjs/0.7.21/webcomponents.js"></script>
	<script src="../../build/react.js"></script>
	<script src="../../build/react-dom.js"></script>
	<script src="https://cdnjs.cloudflare.com/ajax/libs/babel-core/5.8.24/browser.min.js"></script>

	<script type="text/babel">

	function exampleEventHandler(e) {
	console.log('Hello', e);
	}

	// Define WebComponent
	var proto = Object.create(HTMLElement.prototype, {
	attachedCallback: {
	value: function() {
	var mountPoint = document.createElement('span');
	this.createShadowRoot().appendChild(mountPoint);

	var name = this.getAttribute('name');
	ReactDOM.render(<button onClick={exampleEventHandler}>{name}</button>, mountPoint);
	}
	}
	});
	document.registerElement('x-search', {prototype: proto});

	// Define React Component
	class HelloMessage extends React.Component {
	render() {
	return <div>Hello <x-search name={this.props.name} />!</div>;
	}
	}

	// Mount React Component (which uses WebComponent which uses React)
	var container = document.getElementById('container');
	ReactDOM.render(<HelloMessage name="Jim Sproch" />, container);
	</script>
	</body>
	</html>