Fixed typing issues.

app/assets/javascripts/app/controllers/chat.coffee

@@ -233,6 +233,7 @@ class ChatWindow extends App.Controller
     @lastTimestamp
     @lastAddedType
     @isTyping = false
+    @isAgentTyping = false
     @resetUnreadMessages()
 
     @on 'layout-change', @scrollToBottom
@@ -319,6 +320,10 @@ class ChatWindow extends App.Controller
     ENTERKEY = 13
 
     if event.keyCode isnt TABKEY && event.keyCode isnt ENTERKEY
+
+      # send typing start event only every 1.4 seconds
+      return if @isAgentTyping && @isAgentTyping > new Date(new Date().getTime() - 1400)
+      @isAgentTyping = new Date()
       App.WebSocket.send(
         event:'chat_session_typing'
         data:
@@ -413,7 +418,7 @@ class ChatWindow extends App.Controller
       @scrollToBottom()
 
     # clear old delay, set new
-    @delay(@removeWritingLoader, 1800, 'typing')
+    @delay(@removeWritingLoader, 2000, 'typing')
 
   removeWritingLoader: =>
     @isTyping = false

public/assets/chat/chat.coffee

@@ -209,24 +209,16 @@ do($ = window.jQuery, window) ->
 
       sessionStorage.setItem 'unfinished_message', @input.val()
 
-      @onTypingStart()
+      @onTyping()
 
-    onTypingStart: ->
+    onTyping: ->
 
-      clearTimeout(@isTypingTimeout) if @isTypingTimeout
-
-      # fire typingEnd after 5 seconds
-      @isTypingTimeout = setTimeout @onTypingEnd, 1500
-
-      # send typing start event
-      if !@isTyping
-        @isTyping = true
+      # send typing start event only every 1.5 seconds
+      return if @isTyping && @isTyping > new Date(new Date().getTime() - 1500)
+      @isTyping = new Date()
       @send 'chat_session_typing',
         session_id: @sessionId
 
-    onTypingEnd: =>
-      @isTyping = false
-
     onSubmit: (event) =>
       event.preventDefault()
       @sendMessage()
@@ -256,8 +248,6 @@ do($ = window.jQuery, window) ->
       @input.val('')
       @scrollToBottom()
 
-      @isTyping = false
-
       # send message event
       @send 'chat_session_message',
         content: message