TypeError: Cannot read property 'emit' of undefined in socket-CodePudding

io.on('connection', (socket) => {
    
    var ip = socket.client.request.headers['x-forwarded-for'] || socket.client.conn.remoteAddress || socket.conn.remoteAddress || socket.request.connection.remoteAddress;
    console.log(ip)
    console.log('user ket noi '   clients)
    clients  

    //io.emit("new msg", { msg: `Hiện tại có ${clients} đang kết nối !!` });    
    io.broadcast.emit("new msg", { msg: `Hiện tại có ${clients} đang kết nối !!` });    


    socket.on('on-chat', data => {
    io.emit('user-chat', data)
})
    
})

file index.js , i can't use io.broadcast.emit but i can use io.emit how can i fix pls ;( i'm newbie

error in cmd

C:\Users\Admin\Documents\heroku\Chat-real-time\index.js:34 io.broadcast.emit("new msg", { msg: Hiện tại có ${clients} đang kết nối !! }); ^

TypeError: Cannot read property 'emit' of undefined at Namespace. (C:\Users\Admin\Documents\heroku\Chat-real-time\index.js:34:15) at Namespace.emit (events.js:400:28) at Namespace.emitReserved (C:\Users\Admin\Documents\heroku\Chat-real-time\node_modules\socket.io\dist\typed-events.js:56:22) at C:\Users\Admin\Documents\heroku\Chat-real-time\node_modules\socket.io\dist\namespace.js:141:26 at processTicksAndRejections (internal/process/task_queues.js:77:11) [nodemon] app crashed - waiting for file changes before starting...

CodePudding user response：

To broadcast you need to call it from the socket instance not the io instance. So it would be:

socket.broadcast.emit()

You can read more about emitting events in the socket.io docs