Ajax to allow file download

Hello Guys,

          Yesterday i was trying to download the attachment during ajax request. So i find out the some simple way which might help you people.

Below is the controller code snippet:

def download

   file_path = "#{RAILS_ROOT}/test.txt"

   respond_to do |format|

      format.js{

        render :update do |page|

          page.redirect_to :action =>'ajax_download' ,:file => file_path        

        end

      } 

   end

end

def ajax_download

    send_file params[:file]

end

In view i have link for download as:

<%= link_to_remote "Download", :url => {:controller => "test", :action => "download"}%>

Here my parent request is download and than it internally invoke ajax_download action to download attachment.