node.js加入和离开聊天室

Question

I am relatively new to node.js and have been looking it up for quite some time now. I have a problem regarding the handling of multiple chat rooms.

When a user connects, they automatically join the room that I have setup. However, the problems is that the connection is persistent and I wish to address the problem by using the socket.leave(room) method.

My question is, how can this be handled on the client side?

Am I right in putting this on my script?

server.js

io.sockets.on( 'connection', function( socket ) {

    socket.on('join', function(room) {
          socket.join(room);
          console.log("User joined "+room);
    });

    socket.on('disconnect', function(room) {
          socket.leave(room);
          console.log("User left "+room);
    });

On the client, how can I trigger the disconnect event? Should I have it called on Page Unload?

EDIT: Additional Info

User 1 connects to room 1
User 2 connects to room 1

This is a good and great room connection.

However, once there's a switch of rooms

User 1 connects to room 2
User 3 connects to room 2

User 1 is not able to receive the messages from User 3 because he is still listening to room 1

This is the reason why I wish to manage the rooms that the user wishes to join to, hence my question on how to force a User to leave a specific room.

Any advice would be greatly appreciated.

Answer 1

If you emit some event like change room from your client code when user changes room like this:

socket.emit("change room", {newroom: "room name"});

Let's suppose a client has already joined a room as:

socket.on('join', function(room){
  socket.room = room;
  socket.join(room);
});

Then you can do this in server to change the room of that client:

socket.on("change room",function(data){
  socket.leave(socket.room);
  socket.join(data.newroom);
});

You don't have to call socket.leave() in disconnect event. You can do it in your own logic. Hope you can understand this!