class DocumentController < ApplicationController
  upload_status_for :create

  def create
    # ... Your document creation action
  end
end

class Ducoment2Controller < ApplicationController
  upload_status_for :create, :status => :custom_status

  def create
    # ... Your document creation action
  end

  def custom_status
    # ... Override this action to return content to be replaced in the status container
    render :inline => "<%= upload_progress.completed_percent rescue 0 %> % complete", :layout => false
  end
end

<%= form_tag_with_upload_progress({:action => 'create'}, {
      :begin => 'alert("Upload beginning")',
      :finish => 'alert("Upload finished")'}) %>
<%= file_field 'document', 'file' %>
<%= submit_tag "Upload" %>
<%= upload_status_tag %>
<%= end_form_tag %>