react-examples/professional_javascript_for_web/ch23/OnlineEventsExample01.htm at master · zhangjunhd/react-examples · GitHub

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<!DOCTYPE html>
<html>
<head>
    <title>Online Events Example</title>
    <script type="text/javascript" src="EventUtil.js"></script>
</head>
<body>
    <p>You are currently: <span id="status"><script>document.write(navigator.onLine ? "Online" : "Offline");</script></span></p>
    <p>To change your status, click File -&gt; Work Offline. In supporting browsers ,the change is detected via events and the status above should change.</p>
    <script>
        EventUtil.addHandler(window, "online", function(){
            document.getElementById("status").innerHTML = "Online";
        });
        EventUtil.addHandler(window, "offline", function(){
            document.getElementById("status").innerHTML = "Offline";
        });
    </script>
</body>
</html>