Socket.io：如何正确加入和离开房间

Question

我试图通过建立一组动态创建的聊天室，在用户进入和离开时发出“已连接”和“已断开”消息来学习Socket.io。看了一下coupleofquestions我已经整合了一些功能，但大部分的响应都来自承认他们已经入侵答案的人，而且我注意到有一种更一般的和最近的讨论关于正确的方式在Socket.io上做这个回购（特别是here和here）

因为我是这样的新手，我不知道下面的工作是一种可以接受的方式来做事情，或者它只是偶然的功能，但会导致性能问题或导致听众太多。如果有一种理想的和正式的方式来加入和离开房间，感觉不那么笨重，我很乐意了解它。

客户

var roomId = ChatRoomData._id // comes from a factory 


function init() { 

    // Make sure the Socket is connected 
    if (!Socket.socket) { 
     Socket.connect(); 
    } 

    // Sends roomId to server 
    Socket.on('connect', function() { 
     Socket.emit('room', roomId); 
    }); 

    // Remove the event listener when the controller instance is destroyed 
    $scope.$on('$destroy', function() { 
     Socket.removeListener('connect'); 
    }); 

} 

init(); 

服务器

io.sockets.once('connection', function(socket){ 
    socket.on('room', function(room){  // take room variable from client side 
     socket.join(room) // and join it 

     io.sockets.in(room).emit('message', {  // Emits a status message to the connect room when a socket client is connected 
     type: 'status', 
     text: 'Is now connected', 
     created: Date.now(), 
     username: socket.request.user.username 
     }); 

     socket.on('disconnect', function() { // Emits a status message to the connected room when a socket client is disconnected 
     io.sockets.in(room).emit({ 
      type: 'status', 
      text: 'disconnected', 
      created: Date.now(), 
      username: socket.request.user.username 
     }); 
     }) 
    }); 

Answer 1

Socket.IO：最近发布的v2.0.3

雷加丁加入/离开房间[read the docs.]

要加入的房间很简单，只要socket.join('roomName'）

//:JOIN:Client Supplied Room 
socket.on('subscribe',function(room){ 
    try{ 
    console.log('[socket]','join room :',room) 
    socket.join(room); 
    socket.to(room).emit('user joined', socket.id); 
    }catch(e){ 
    console.log('[error]','join room :',e); 
    socket.emit('error','couldnt perform requested action'); 
    } 
}) 

，并离开房间，简单socket.leave('roomName');：

//:LEAVE:Client Supplied Room 
socket.on('unsubscribe',function(room){ 
    try{ 
    console.log('[socket]','leave room :', room); 
    socket.leave(room); 
    socket.to(room).emit('user left', socket.id); 
    }catch(e){ 
    console.log('[error]','leave room :', e); 
    socket.emit('error','couldnt perform requested action'); 
    } 
}) 

告知问题房间用户断开的房间

Not able to get the list of rooms the client is currently in on disconnect event

Has been fixed (Add a 'disconnecting' event to access to socket.rooms upon disconnection)

socket.on('disconnect', function(){(
    /* 
     socket.rooms is empty here 
     leaveAll() has already been called 
    */ 
}); 
socket.on('disconnecting', function(){ 
    // socket.rooms should isn't empty here 
    var rooms = socket.rooms.slice(); 
    /* 
    here you can iterate over the rooms and emit to each 
    of those rooms where the disconnecting user was. 
    */ 
}); 

我们发送到特定的房间：

// sending to all clients in 'roomName' room except sender 
    socket.to('roomName').emit('event', 'content'); 

Socket.IO Emit Cheatsheet