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document.addEventListener("DOMContentLoaded", function() {
var head = 0, tail = 0, ring = new Array(), es;
es = new EventSource("/sse/sourcename");
try {
es.onopen = function() {
// console.log("EventSource opened");
document.getElementById("r").disabled = 0;
};
es.onmessage = function got_packet(msg) {
var n, s = "";
// console.log(msg.data);
ring[head] = msg.data + "\n";
head = (head + 1) % 50;
if (tail === head)
tail = (tail + 1) % 50;
n = tail;
do {
s = s + ring[n];
n = (n + 1) % 50;
} while (n !== head);
document.getElementById("r").value = s;
document.getElementById("r").scrollTop =
document.getElementById("r").scrollHeight;
};
/* there is no onclose() for EventSource */
} catch(exception) {
alert("<p>Error" + exception);
}
}, false);
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