sync-with-server/comet-ajax.html at master · ricocmc/sync-with-server · GitHub

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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Comet</title>
<style>
iframe {
    position: fixed;
    right: 10px;
    top: 10px;
    width: 500px;
    height: 500px;
}
#show {
    border: solid 1px #ccc;
    padding: 5px;
    width: 500px;
    height: 500px;
    font-size: 11px;
    overflow: auto;
}
</style>
</head>
<body>

    <h1>Comet (XMLHttpRequest Version)</h1>

    <div id="show"></div>

    <script type="text/javascript" src="http://yui.yahooapis.com/3.3.0/build/yui/yui-min.js"></script>
    <script type="text/javascript">
    YUI().use("node-base", function (Y) {
        var node  = Y.one("#show");
        try {
            var request = new XMLHttpRequest();
        } catch (e) {
            alert("Browser doesn't support window.XMLHttpRequest");
        }
        var pos = 0;
        request.onreadystatechange = function () {
            if (request.readyState === 3) { // Interactive Mode
                try {
                    var text = request.responseText;
                } catch (e) {
                    alert("Browser doesn't support XMLHttpRequest streaming.");
                    return;
                }
                node.append("<p>" + text.substring(pos) + "</p>");
                pos = text.length;
            }
        };
        request.open("GET", "comet-ajax.php", true);
        request.send(null);
    });
    </script>
</body>
</html>