is pulgn support callback

[hatemragab]

i want to implement something like server code

io.sockets.on('connection', connectionFunc);

function connectionFunc (socket) {
    socket.emit('delete hint', "data for client", callThis);
}

//this function is executed when client calls it
function callThis (dataFromClient){

    console.log("Call back fired: " + dataFromClient);
}

clint code

socket.on('delete hint', function(data, callback) {

        console.log("i received: "+ data);
        // call back will fire only when u the next line runs
        callback("the callThis function on server will run");            

    });

how to perform that in dart callback function not supported in dart version

[tiholic]

@hatemragab if you want to use callbacks, please check out emitWithAck which will return a promise.

You can do something like:

final args = await emitWithAck(....);
console.log('Ack given by server: $args');

-or-

emitWithAck(....).then((args) {
   console.log('callback called with args $args');
});

[hatemragab]

Thanks for replying I already know this case that clint emit what about if server emit and need to confirm that the clint has received

[smasinde]

Thanks for replying I already know this case that clint emit what about if server emit and need to confirm that the clint has received

same thing. the listener you create has an ack callback

[hatemragab]

I have fix it by check if socket.connected true then emit if not not emi

[tiholic]

@hatemragab a new API is added now in V1.0.0

socket.connectSync please check new example in README for more

Feel free to re-open if you still face this issue