Coffeescript.coffee

postForm: =>
  # serialize and send the form to CM
  # `url` will be `http://theconversation.createsend.com/t/r/s/foo`
  url = "#{@form.attr('action')}?callback=?"
  @showLoader( =>
    $.getJSON(
      url,
      @form.serialize(),
      (data) =>
        @hideLoader()
        @handleCMResponse(data)
    )
  )

Markup.html

<form action="http://theconversation.createsend.com/t/r/s/foo" method="post">
  <div class="input-wrapper">
    <input type="text" id="cm-foobar-foobar" name="cm-foobar-foobar" placeholder="Your email address" >
    <input type="submit" value="subscribe &rarr;" class="input-button">
  </div>
</form>