such-java-much-script/delegating.html at master · seutje/such-java-much-script · GitHub

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<!doctype html>
<html lang="en">

  <head>
    <meta charset="utf-8">

    <title>Events: Delagating</title>
    <style>
      body { border: 2px solid red; padding: 20px;}
      form { border: 2px solid green;}
      button { border: 2px solid blue;}
    </style>
  </head>
  <body>
    <ul>
      <li><a class="foo" href="#">Click me!</a></li>
      <li><a class="nope" href="#">Not me!</a></li>
    </ul>
    <script>
    (function(window) {
      // Handler that calls preventDefault on the event.
      var handler = function(e) {
            if (e.target.className === 'foo') {
              e.preventDefault();
              console.log('Do something!');
            }
          };
      // Attach the handler to the entire body element.
      window.document.body.addEventListener('click', handler);
    })(this);
    </script>
  </body>
</html>