Ref: http://stackoverflow.com/questions/13478303/correct-way-to-use-modernizr-to-detect-ie

BrowserDetect.coffee

# TO USE:
# window.app.helpers.browserDetect.initialize()
# window.app.helpers.browserDetect.browser == "Safari"
# window.app.helpers.browserDetect.version == 2

"use strict";

window.app                  = window.app  or  {}
window.app.helpers          = window.app.helpers  or  {}

window.app.helpers.browserDetect =

  initialize : ->
    console.log "Browser Detect Initialize"
    @browser = @searchString(@dataBrowser) or "Other"
    @version = @searchVersion(navigator.userAgent) or @searchVersion(navigator.appVersion) or "Unknown"


  searchString : (data) ->
    lock = false
    for item in data
      dataString            = item.string
      if dataString.indexOf(item.subString) != -1 and lock is false
        @versionSearchString  = item.subString
        identity =  item.identity
        lock = true

    identity


  searchVersion : (dataString) ->
    index = dataString.indexOf @versionSearchString
    if index is -1
      return
    parseFloat(dataString.substring(index + @versionSearchString.length + 1))


  dataBrowser : [
      "string"    : navigator.userAgent
      "subString" : "Chrome"
      "identity"  : "Chrome"
    ,
      "string"    : navigator.userAgent
      "subString" : "MSIE"
      "identity"  : "Explorer"
    ,
      "string"    : navigator.userAgent
      "subString" : "Firefox"
      "identity"  : "Firefox"
    ,
      "string"    : navigator.userAgent
      "subString" : "Safari"
      "identity"  : "Safari"
    ,
      "string"    : navigator.userAgent
      "subString" : "Opera"
      "identity"  : "Opera"
    ]