This is a small module for handling disconnects in the client while using SockJS. The reconnection proceeds in the following manner (by default):
- When
oncloseis triggered, it first tries to reconnect immediately. - If it remains unconnected, another attempt is done after
t = 1500 + xmilliseconds, and then at2 * t,4 * t, ...,32 * t. - If it is still unconnected, the multiplier is reset to
1and the process is repeated. - If it does not connect after
30attempts, it stops trying and performs a page reload. - In case
onopenis triggered at any point, the parameters are reset to the initial values.
All the parameters used above are configurable, and here is an example using the module (try stopping/starting the server):
<!DOCTYPE html>
<html>
<head>
<script src="http://cdnjs.cloudflare.com/ajax/libs/zepto/1.0/zepto.min.js">
</script>
<script src="http://cdn.sockjs.org/sockjs-0.3.min.js"></script>
<script src="/static/sockjs_reconnect.min.js"></script>
<script>
/* Example usage. */
new_status = function(status) {
$('#status').text(status);
if (status === 'connected') {
sock.send('ping');
}
}
on_message = function(msg) {
$('#last-message').text(msg.data);
setTimeout(function() { if (sock.conn) { sock.send('ping'); } },
150);
}
var sock = new SockReconnect('/sock', null, new_status, on_message);
if (window.addEventListener) {
window.addEventListener('load', sock.connect, false);
} else {
window.attachEvent('onload', sock.connect);
}
</script>
</head>
<body>
<p>Connection status: <span id="status">Disconnected</span></p>
<p>Last message: <span id="last-message"></span></p>
</body>
</html>