Simple Node.js/Socket.io Chat Server

chat_view.coffee

Array.prototype.getUnique = ->
  u = {}
  a = []
  for i in [0..this.length]
    if this[i] in u
      continue
    a.push this[i]
    u[this[i]] = 1
  return a
sideLoad = (socket) ->
    v_name = $('#username').text()
    socket.emit 'register', v_name
    return v_name
chatForm = (socket, v_name) ->
  v_message = ''
  $('#chat-form form').keypress (e) ->
    if e.keyCode != 13
      return
    if e.keyCode == 13
      e.preventDefault()
      v_message = $('#chat-form .input input').val()
      socket.emit 'chat', v_message
      $('#chat-text ul').append '<li><b>' + v_name + ':</b> ' + v_message + '</li>'
      $('#chat-text').scrollTop $('#chat-text')[0].scrollHeight
      $('#chat-form input').val ''
chatShow = ->
  $('#footer a').click (e) ->
    e.preventDefault()
    if $('#chat').is(":visible")
      return $('#chat').hide()
    $('#chat').show()
    $('#chat-form .input input').focus()
commandFilter = (data, v_name, callback) ->
  v_message = data.msg
  if v_message == '<open ' + v_name + '>'
    $('#chat').show()
  else if v_message == '<close ' + v_name + '>'
    $('#chat').hide()
  callback(v_message.replace /<.+>/, '')
chatDisplay = (socket, v_name) ->
  socket.on 'chat', (data) ->
    v_nothing = commandFilter data, v_name, (v_result) ->
      if v_result != ''
        $('#chat-text ul').append '<li><b>' + data.msgr + ':</b> ' + v_result + '</li>'
        $('#chat-text').scrollTop $('#chat-text')[0].scrollHeight
  socket.on 'users', (data) ->
    $('#chat-users ul').empty()
    a_users = data.users.getUnique()
    $.each a_users, (key, value) ->
      if value
        $('#chat-users ul').append '<li><b>' + value + '</b></li>'
$(document).ready ->
  $.getScript "http://10.104.17.207:8000/socket.io/socket.io.js", ->
    socket = io.connect 'http://10.104.17.207:8000'
    v_name = sideLoad socket
    chatShow()
    chatDisplay socket, v_name
    chatForm socket , v_name

node-server.coffee

io = require('socket.io').listen 8000
a_active_users = []
io.sockets.on 'connection', (socket) ->
  console.log io.sockets
  socket.on 'chat', (data) ->
    sender = 'unregistered';
    socket.get 'nickname', (err, name) ->
      console.log 'Chat message by ', name
      console.log 'error ', err
      sender = name
    socket.broadcast.emit 'chat', msg : data, msgr : sender
  socket.on 'register', (name) ->
    socket.set 'nickname', name, ->
      a_active_users.push(name);
      io.sockets.emit 'users', users : a_active_users
      #socket.broadcast.emit 'chat', msg : 'Welcome ' + name, msgr : ''
      #io.sockets.emit 'chat', msg : name + ' has joined.', msgr : ''
  socket.on 'disconnect', ->
    socket.get 'nickname', (err, name) ->
      console.log 'Log off by ', name
      console.log 'error ', err
      a_active_users.splice a_active_users.indexOf name, 1
      #io.sockets.emit 'chat', msg : name + ' has left.', msgr : ''
      io.sockets.emit 'users', users : a_active_users