shared_count.coffee

SharedCount = Object.create(HTMLSpanElement.prototype)

PROVIDERS =
  facebook:
    url: (url) -> "http://graph.facebook.com/#{url}"
    counter_field: 'share.share_count'
  twitter:
    url: (url) -> "http://opensharecount.com/count.json?url=#{url}"
    counter_field: 'count'

SharedCount.createdCallback = ->
  provider = PROVIDERS[@getAttribute('provider')]
  url = provider.url(@getAttribute('url'))
  $.ajax
    url: url
    cache: false
    dataType: 'json'
    success: (json) =>
      keys = provider.counter_field.split('.')
      value = json
      for key in keys
        value = value[key] if value
      @textContent = value || 0

document.registerElement 'shared-count',
  prototype: SharedCount