keyscanner

KeyScanner

Overview

KeyScanner is a library that allows reading input events from a barcode machine or other similar devices (like a mobile device with a barcode scanner), and distinguish them from normal user keystrokes. All barcode scanners can feed text into your application if you're focused into a text field however, KeyScanner does not require user focus in a text field, and provides a simple API to obtain the scanned text. When you connect a barcode machine to your computer and scan a code, KeyScanner intercepts those and makes it available to your application in an easy to use manner.

Quick Start Guide

npm i keyscanner --save

import keyscanner from 'keyscanner';

const keyScanHandle = new keyscanner(myFuncOnScan);

const myFuncOnScan = barcodeValue => {
    console.log('The scan from your barcode machine', barcodeValue);
    // Do what you like with the barcodeValue now !!!
}

Ask keyscanner to Stop Listening to events when you no longer need it

const keyScanHandle = new keyscanner(myFuncOnScan);
keyScanHandle.stop();

Configuration Options (Optional)

    const config = {
        overall_percentage : 80,
        key_stroke_speed_ms: 0.017,
        minimum_no_chars: 5
    }
    const keyScanHandle = new keyscanner(myFuncOnScan, config);

Property	Description
overall_percentage	The Overall percentage 1 - 100, at which scanner input passes the speed threshold mentioned in key_stroke_speed_ms.(default 95, meaning 95% of the character input must be faster than the speed threshold mentioned in key_stroke_speed_ms)
key_stroke_speed_ms	The speed in milli-seconds the scanner sends alphabets it scans. (default: 0.017)
minimum_no_chars	The minimum number of characters that a barcode should contain, inorder to get notified (default 4). Hence any inputs containing less than the value specified is ignored by keyscanner.