Socket IO handling disconnect event

Question

Cant handle this disconnect event  dont know why socket its not send to the client   client doesnt response   Server  io sockets on  connection   function  socket       socket on  NewPlayer   function data1         online   online   1      console log  Online players       online       console log  New player connected       data1       Players data1    data1      console log Players             socket on  DelPlayer   function data         delete Players data       console log Players       console log  Adios    data             socket on  disconnect   function             socket emit  disconnected          online   online - 1                Client   var socket   io connect  http   localhost         socket on  connect   function                person name   prompt  Welcome  Please enter your name             socket emit  NewPlayer   person name            socket on  disconnected   function                  socket emit  DelPlayer   person name                           As you can see when a client disconnects the Array object person name  should be deleted  but its not

User · Accepted Answer

Ok  instead of identifying players by name track with sockets through which they have connected  You can have a implementation like   Server  var allClients       io sockets on  connection   function socket       allClients push socket       socket on  disconnect   function           console log  Got disconnect            var i   allClients indexOf socket         allClients splice i  1                Hope this will help you to think in another way

User · Answer

Create a Map or a Set  and using  on connection  event set to it each connected socket  in reverse  once disconnect  event delete that socket from the Map we created earlier    import   as Server from  socket io    const io   Server    io listen 3000    const connections   new Set     io on  connection   function  s       connections add s      s once  disconnect   function          connections delete s

User · Answer

For those like  sha1 wondering why the OP s code doesn t work -  OP s logic for deleting player at server side is in the handler for DelPlayer event  and the code that emits this event  DelPlayer  is in inside disconnected event callback of client   The server side code that emits this disconnected event is inside the disconnect event callback which is fired when the socket loses connection  Since the socket already lost connection  disconnected event doesn t reach the client     Accepted solution executes the logic on disconnect event at server side  which is fired when the socket disconnects  hence works

User · Answer

You can also  if you like use socket id to manage your player list like this   io on  connection   function socket     socket on  disconnect   function         console log  disconnect       for var i   0  i  lt  onlineplayers length  i            if onlineplayers i  socket     socket id           console log onlineplayers i  code     just disconnected           onlineplayers splice i  1                    io emit  players   onlineplayers          socket on  lobby join   function player        if player available     false  return     var exists   false     for var i   0  i  lt  onlineplayers length  i            if onlineplayers i  code     player code           exists   true                   if exists     false         onlineplayers push           code  player code          socket socket id                    io emit  players   onlineplayers          socket on  lobby leave   function player        var exists   false     for var i   0  i  lt  onlineplayers length  i            if onlineplayers i  code     player code           onlineplayers splice i  1                    io emit  players   onlineplayers

[javascript] Socket.IO handling disconnect event

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