socket.on('receiveMessage',(data)=>print("data")) called twice

[jabonge]

socket = IO.io("myserverurl", <String, dynamic>{
'transports': ['websocket']
});
socket.nsp = "/chats";

    socket.on("receiveMessage", (data) {
      print("from socket $data");
             });
    socket.connect();
    socket.emit("join", {"Id": "id"});

i send message my server log message call twice why it is called twice?
server code
io.of('nsp').to('id').('receiveMessage',message);

[jabonge]

in Flutter i dont really know why log called twice i will wait answer thank you for your attention

[bastibense]

Came across the same issue. Apparently calling .connect() causes all event handlers to get registered/fired twice.

Try removing the connect() call, the socket should automatically connect.

[leonidl]

You can also add "'autoConnect': false" option to optional parameters list to stop socket from auto-connecting. In that case you will have to call connect() manually.

[bastibense]

Still, shouldn't this at least print out a warning to the log or just ignore a second call to connect()?

[jumperchen]

@bastibense I reopen it, and it looks like the behavior is not the same as JS version.

[itaispector]

Came across the same issue. Apparently calling .connect() causes all event handlers to get registered/fired twice.

Try removing the connect() call, the socket should automatically connect.

still fired twice

[RIddhiIroid]

Came across the same issue. Apparently calling .connect() causes all event handlers to get registered/fired twice.
Try removing the connect() call, the socket should automatically connect.

still fired twice

Hello
Did you manage to solve this?

[akshayindia]

Facing the same issue flutter...

[akshayindia]

front end ----

IO.Socket? socket;
@OverRide
void initState() {
super.initState();
// connect();

focusNode.addListener(() {
  if (focusNode.hasFocus) {
    setState(() {
      show = false;
    });
  }
});
connect();

}

void connect() {
// MessageModel messageModel = MessageModel(sourceId: widget.sourceChat.id.toString(),targetId: );
socket = IO.io("https://studiovity.com/", <String, dynamic>{
"transports": ["websocket"],
// "autoConnect": true,
});
// socket!.connect();
socket!.emit("signin", widget.sourchat.id);
socket!.onConnect((data) {
print("Connected");
socket!.on("message", (msg) {
print(msg);
setMessage("destination", msg["message"]);
_scrollController.animateTo(_scrollController.position.maxScrollExtent,
duration: Duration(milliseconds: 300), curve: Curves.easeOut);
});
});
print(socket!.connected);
}

Backend

const express = require("express");
var http = require("http");
const app = express();
const port = process.env.PORT || 5000;
var server = http.createServer(app);
var io = require("socket.io")(server);

//middlewre
app.use(express.json());
var clients = {};

io.on("connection", (socket) => {
console.log("connetetd");
// accept();
console.log(socket.id, "has joined");
socket.on("signin", (id) => {
console.log(id);
clients[id] = socket;
console.log(clients);
});
socket.on("message", (msg) => {
console.log(msg);
let targetId = msg.targetId;
if (clients[targetId]) clients[targetId].emit("message", msg);
});
});

server.listen(port, "0.0.0.0", () => {
console.log("server started");
});