Socket.io connect with server offline

Question

How do I detect if the server is offline, or for some other reason cannot connect. My code looks something like this.

this.socket = io.connect(connectionInfo, {
    reconnect:false
});

It does not throw any error, so a try/catch clause is not working.

Answer 1

Use

• this.socket.on("connect", callback) to catch connection events
• this.socket.on("disconnect", callback) to catch disconnection events
• this.socket.on("connect_failed", callback) to catch failed connection attempts
• this.socket.io.on("connect_error", callback) to catch if the server is offline

You can find all events, at https://github.com/LearnBoost/socket.io/wiki/Exposed-events