Is there a callback for the io.connect() method in Socket.IO?

Question

Is there any callback for the io.connect() method on the client side? I would like to print some text about connection failure, otherwise proceed normally with the site's socket interactions.

Answer 1

Sure, checkout the documentation for Socket.IO-client with the examples there:

https://github.com/LearnBoost/socket.io-client#sockets-for-the-rest-of-us

socket.on('connect', function () {
  // socket connected
});

Answer 2

In the current release of socket.io (1.3.x) you can use the connect_error event or the reconnect_failed event:

var socket = io(serverUrl);
socket.on('connect_error', function() {
    console.log('Connection failed');
});
socket.on('reconnect_failed', function() {
    console.log('Reconnection failed');
});

See: https://github.com/Automattic/socket.io-client#events