Advanced TypeScript Programming Projects

Finishing the server sockets

Before we add the actual component implementations, we are going to add in the rest of our server-side socket behavior. You may remember that we added the ability to read all the historical records and send them back to the newly connected client:

socket.on('joinRoom', (room: string) => {  if (lastRoom !== '') {    socket.leave(lastRoom);  }  if (room !== '') {    socket.join(room);  }  this.messageDataAccess.GetAll({room: room}, {messageText: 1, _id: 0}).then((msgs: string[]) =>{    socket.emit('allMessages', msgs);  });  lastRoom = room;});

What we have here is the server reacting to joinRoom coming over from the client. When we receive this event, we leave the last room if it has been set and then join the room that's passed ...