<meta charset="UTF-8">
<html>
<body>
<img src="libwebsockets.org-logo.png"><br>
<b>Minimal ws server threads example</b>.<br>
Strings generated by server threads are sent to
all browsers open on this page.<br>
The textarea show the last 50 lines received.
<br>
<br>
<textarea id=r readonly cols=40 rows=50></textarea><br>
</body>
<script>
var head = 0, tail = 0, ring = new Array();
function get_appropriate_ws_url(extra_url)
{
var pcol;
var u = document.URL;
/*
* We open the websocket encrypted if this page came on an
* https:// url itself, otherwise unencrypted
*/
if (u.substring(0, 5) == "https") {
pcol = "wss://";
u = u.substr(8);
} else {
pcol = "ws://";
if (u.substring(0, 4) == "http")
u = u.substr(7);
}
u = u.split('/');
/* + "/xxx" bit is for IE10 workaround */
return pcol + u[0] + "/" + extra_url;
}
function new_ws(urlpath, protocol)
{
if (typeof MozWebSocket != "undefined")
return new MozWebSocket(urlpath, protocol);
return new WebSocket(urlpath, protocol);
}
ws = new_ws(get_appropriate_ws_url(""), "lws-minimal");
try {
ws.onopen = function() {
document.getElementById("m").disabled = 0;
document.getElementById("b").disabled = 0;
}
ws.onmessage =function got_packet(msg) {
var n, s = "";
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;
}
ws.onclose = function(){
document.getElementById("m").disabled = 1;
document.getElementById("b").disabled = 1;
}
} catch(exception) {
alert('<p>Error' + exception);
}
</script>
</html>