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first set the decodeEvent then enable the scanner (do this on page load). Once this is done the scanner event will call the "scannerEventListner".
You have to call the Scanner.decodeEvent first as below code
Scanner.decodeEvent = url_for(:action => :scannerEventListener)
Also you have to disabled datawedge.
Hope it helps
Thanks for all response. Actuly i m checking it with the barcode which is not clear so it is unable to read.