Barcode scan handler

This package can be used to retrieve input from a physical barcode-scanner that works just like a keyboard. It uses timing between character inputs to detect if the input is from a barcode-scanner.

Install

npm install @wrurik/barcode-scanner

Usage

First require the barcode scanner

let barcodeReader = require('@wrurik/barcode-scanner')

or

import barcodeReader from `@wrurik/barcode-scanner`

You can start listening for input by invoking the onScan function:

let removeListener = barcodeReader.onScan(scanHandler, options)

The onScan function returns a function you can execute to stop listening for barcode-input. So to stop the scan from the example above you should:

removeListener(); 

Parameters

The onScan function expects 2 parameters:

Callback

The first parameter should be a function that is executed when the scan is completed. This function receives the scanned input as only parameter.

Options

The second parameter is an object with options. The possible options are:

Option	Type	Default	Description
barcodePrefix	String	''	Prefix for the barcode. ScanHandler is only executed when the prefix is found in the scanned barcode.
endCharacterCode	Number	13	The characterCode that indicates the end of the scan. This can be configured in most barcode-readers. The default is the enter key (13)
scanDuration	Number	200	The maximum time between character inputs in milliseconds.
event	String	'keypress'	The Javascript-event it should listen to.