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# application.js
//= require refile

# _form.html.erb

    <div class="progress" id='progress-bar' style='display:none;'>
      <div class="progress-bar progress-bar-striped active" role="progressbar" style="width: 0%">
        <span class="sr-only" id='progress-bar-text'></span>
      </div>
    </div>

    <%= f.attachment_field :profile_image, direct: true %>

# users.coffee
    jQuery ->
      $(document).on "upload:start", "form", (e) ->
        $(this).find("input[type=submit]").attr "disabled", true
        $("#progress-bar").slideDown('fast')

      $(document).on "upload:progress", "form", (e) ->
        detail          = e.originalEvent.detail
        percentComplete = Math.round(detail.loaded / detail.total * 100)
        $('.progress-bar').width("#{percentComplete}%");
        $("#progress-bar-text").text("#{percentComplete}% Complete")

      $(document).on "upload:success", "form", (e) ->
        $(this).find("input[type=submit]").removeAttr "disabled"  unless $(this).find("input.uploading").length
        $("#progress-bar").slideUp('fast')