socket.io - how to broadcast messages on a namespace?

Question

According to socket.io examples:

To broadcast, simply add a broadcast flag to emit and send method calls. Broad

Answer 1

You solution works if you are working in an evented environment where messages from the client trigger a response to all others, but not if you want the server to sent messages to all clients.

You can do this using io.sockets.emit:

var io = require('socket.io').listen(80);
io.sockets.emit('message', { message: "Hello everyone!" });

However the documentation isn't clear for how to do this to a specific namespace. io.sockets is just a shortcut to io.of(''), as such you can broadcast to everyone on a namespace by calling io.of('/namespace').emit:

var io = require('socket.io').listen(80);
io.of('/admins').emit('message', { message: "Hello admins!" });