ET1 Barcode Scanning ISSUE

Hi All,

I have just started working on ET1 using Rhoelement , issue  i ma facing with ET1, I am not able to catch global event or can say  manual machine scan event for barcode,

for example i wrote a application that will read barcode and place in simply in textbox.

def index

        if !$scanners

          $scanners = []

          Barcode.enumerate(url_for(:action => :enumerate_callback))

          multiscan()

      else

      end

end

def enumerate_callback

$scanners = @params['scannerArray']

  end

  def multiscan

    $scanners.each do |scan|

      @scanername = scan['deviceName']

    end

    scanner = @scanername

    #      puts "multiscan - using scanner: #{scanner}"

    #$barcodes = []

    Barcode.enable( url_for(:action => :multi_callback), {:deviceName => scanner})

  end

  def multi_callback

       begin

          status = @params['status']

           barcode = @params['barcode']

           WebView.execute_js("addBarcode('#{barcode}')")

    rescue Exception => e

      Alert.show_popup(e.message)

     end

end

this enable the barcode scanner camera  while you reading the barcode but once you did not scan a barcode and camera is disappear and  we trigger ET1 barcode button camera will display and scan a barcode but we are not able to capture the data that is sent by scanner , my assumption is barcode scanning manual from machine ET1 is create a different  object , How can we find that object ???

or any other way to capture machine bar code scan event ...