Defer Loading of Scripts

defer.coffee

downloadJSAtOnload = ->
  scripts = [
    { src: '//www.googleadservices.com/pagead/conversion.js' } # Google Adwords
    { src: '//platform.twitter.com/oct.js' } # Twitter Conversion Tracking
    { src: "//js.hubspot.com/analytics/#{(Math.ceil(new Date()/300000)*300000)}/123456.js", id: 'hs-analytics' } # Hubspot
    { src: '//tag.perfectaudience.com/serve/SHASHASHASHASHASHA.js' } # Perfect Audience
    { src: '//cdn.bizible.com/_biz-a.js', id: 'bizible-settings' } # Bizible
    { src: "#{if ("https:" is document.location.protocol) then "https://s" else "http://a"}.adroll.com/j/roundtrip.js" } # Adroll
  ]
  for script in scripts
    element = document.createElement('script')
    element.async = true
    element.src = script.src
    element.id  = script.id  if script.id
    element.setAttribute('data-attach-secure-forms', true)  if script.id is 'bizible-settings'
    document.body.appendChild element

  # Twitter Conversion Tracking
  setTimeout( ->
    window.twttr.conversion.trackPid('123ab')  if typeof window.twttr isnt 'undefined'
  , 500)

  # AdRoll
  window.__adroll_loaded = true

  return

# Google Adwords
google_conversion_id = 1234567890
google_conversion_language = "en_US"
google_conversion_format = "3"
google_conversion_color = "ffffff"
google_conversion_label = "abcdefghijklmnop"
google_conversion_value = 0

# Perfect Audience
window._pa = window._pa or {}

# AdRoll
window.adroll_adv_id = '0123456789ABCDEF012345'
window.adroll_pix_id = '6789ABCDEF0123456789AB'

if window.addEventListener
  window.addEventListener 'load', downloadJSAtOnload, false
else if window.attachEvent
  window.attachEvent 'onload', downloadJSAtOnload
else
  window.onload = downloadJSAtOnload