I'm trying to make an emit with a callback, but it seems like the server doesn't recognize the call back function as a function. I have looked up the documentation, and to my knowledge the code should work.

This is the error I'm getting: TypeError: callBack is not a function

Here is the client code:

socket?.emitWithAck("connectUsername", username).timingOut(after: 2, callback: { (data) in
            
        print(data)
    })

And server code:    

socket.on("connectUsername", function(username, callBack)
    {
        //Do stuff with username here...

        var id = socket.id
        callBack(id);
     });

Any help is appreciated.

I'm trying to make an emit with a callback, but it seems like the server doesn't recognize the call back function as a function. I have looked up the documentation, and to my knowledge the code should work.

This is the error I'm getting: TypeError: callBack is not a function

Here is the client code:

socket?.emitWithAck("connectUsername", username).timingOut(after: 2, callback: { (data) in
            
        print(data)
    })

And server code:    

socket.on("connectUsername", function(username, callBack)
    {
        //Do stuff with username here...

        var id = socket.id
        callBack(id);
     });

Any help is appreciated.

• javascript
• ios
• swift
• socket.io

4 Answers 4

as @kiddosrails mention problem is the timeout 2 seconds is less time to execute, you can set timeout 0 which refer as not time out. Hope this answer will help you.

     socket.emitWithAck("connectUsername", username).timingOut(after: 0) {data in
      print(data)    
    }

I don't see callback as a parameter of timingOut in documentation. Following should work:

socket.emitWithAck("connectUsername", username).timingOut(after: 20) { data in 
  print(data)
}

If above does not work, check what exactly is callBack by changing it to following:

socket.on("connectUsername", function(username, callBack)
    {
        //Do stuff with username here...

        var id = socket.id
        console.log(callBack.toString());
     });

iOS Code

socket?.emitWithAck("connectUsername", data).timingOut(after: 0) {data in
            print(data) 
        }

Server Code

var io = socketIO.listen(server);
io.sockets.on('connection', function(client){
    console.log('a user connected..!!!!!');
    client.on('connectUsername', function(username, callBack){
        var id = socket.id
        callback({
        ID:id,
        Message: "Successfully."
        });
    }
}

In your server code:

socket.on("connectUsername", function(username, callBack)
    {
        //Do stuff with username here...

        var id = socket.id
        callBack = ({id});
     });

That's because callback is not defined like an object so you can defined it like one.