how to check status connected ?

[TheWow]

how to check status connected ? help me please this error error: Uncaught TypeError: Cannot read property 'isClosed' of undefined return this.webSocket!.isClosed;

[ryo-ma]

Let me see your code. I thought that websocket does not still opening the socket. Therefore, this.webSocket is not still initialized.

[TheWow]

i want to create class for send data export class SocketController { async sendSocket(msg: string) { const ws: WebSocket = new WebSocket("ws://192.168.1.1:7001"); ws.on("open", function () { ws.send(${msg}); }); ws.on("message", function (message: string) { console.log(message); }); // ws.on("close", function () { // }); } } and user class SocketController.sendSocket( { "event":"process", "message":${i + 1}, "value":${tonumprocess}, "total":${i + 1} }); please Recommend

[ryo-ma]

Where did you call isClosed in the code? And you should fix indent format. And I don't know $ syntax.

[TheWow]

server.ts file

const wss = new WebSocketServer(7001);

console.log(
  `websocket Listening on:https://0.0.0.0:7001`,
);
interface BroadcastObj {
  event: string;
  message: string;
  value: number;
  total: number;
}
wss.on("connection", function (ws: WebSocket) {
  console.log("socket connected!");
  ws.on("message", function (message: string) {
    let evObj = JSON.parse(message.toString());
    broadcast(evObj);
  });
});
const broadcast = function broadcast(msg: BroadcastObj) {
  wss.clients.forEach(function each(client) {
    client.send(JSON.stringify(msg));
  });
};

SocketController.ts file

export class SocketController {
  async sendSocket(msg: string) {
    const ws: WebSocket = new WebSocket("ws://192.168.1.1:7001");
    if (ws.isClosed == true) {
      ws.on("close", function () {
        console.log("closed connect");
      });
    } else {
      ws.on("open", function () {
        ws.send(`${msg}`);
      });
      ws.on("message", function (message: string) {
        console.log(message);
      });
    }

    //console.log(ws.isClosed);
    // ws.on("message", function (message: string) {
    //   console.log(message);
    // });
    // ws.on("close", function () {
    // });
  }
}

export default new SocketController();

after run

 for (let i = 0; i < totalprocess; i++) {
      SocketController.sendSocket(`
      {
        "event":"process",
        "message":${i + 1},
        "value":${totalprocess},
        "total":${i + 1}
      }`);
    }

error

error: Uncaught TypeError: Cannot read property 'isClosed' of undefined
    return this.webSocket!.isClosed;
                           ^
    at WebSocket.get isClosed (websocket.ts:141:28)
    at SocketController.sendSocket (SocketController.ts:10:12)
    at ProcessController.testsocket (ProcessController.ts:70:24)

please recommend for this i want to create loop send data websocket server to client for update progress bar realtime thanks

[ryo-ma]

You can not use isClosed in the outside of callback such code. isClosed can only be used after ws.on("open"... is called.

like this.

      ws.on("open", function () {
        console.log(`isClosed: ${ws.isClosed}`);
      });
      ws.on("close", function () {
        console.log("closed connect");
        console.log(`isClosed: ${ws.isClosed}`);
      });

[TheWow]

thanks you