1.0.4 • Published 4 years ago
scan-detector v1.0.4
Scan Detector
Detect barcode scanner and keyboard input events separately in your web or electronJS application with ease.
install
$ npm i scan-detector --saveQuick usage
const ScanDetector = require("scan-detector");
let detector = ScanDetector();
detector.attach();
document.addEventListener("scanner", (e) => {
// handle scan code
});
document.addEventListener("keyboard", (e) => {
// handle keyboard input
});
detector.detach();Options
let sd = ScanDetector({ element: document, minCodeLength: 4 });| Option | Type | Default | Description |
|---|---|---|---|
| element | html element | document | html element to attach and listen for inputs |
| prefix | array (char codes) | [] | these characters will be discarded |
| suffix | array (char codes) | 9, 13 | possible end characters, will be discarded |
| avgCharTime | number (ms) | 30 | average time between each scanner keydown event |
| minCodeLength | number | 6 | min length of scanned code |
| customEncoder | function(number keyCode) | null | will be called on each keydown event |
| onScanFinish | function(string scanCode) | null | will be called when scan is finished |
| preventDefault | bool | false | prevent default keydown behavior |
| stopPropagation | bool | false | stops event propagation |
| debugMode | bool | false | logs each keydown event in console |
Methods
setOptions(options):
seta detector options.
getOptions():
returns detector options.
attach():
attach detector to the element, it will listen to keydown event in the element.
detach():
detach detector from element.
Example
const ScanDetector = require("scan-detector");
let input = document.getElementById("text_input");
let detector = ScanDetector({
element: document,
avgCharTime: 30,
minCodeLength: 6,
customEncoder: (event) => {
return event.key;
},
onScanFinish: (code) => {
return [...code.matchAll(/Alt([0-9]{3})/g)].reduce((t, v) => {
return (t += String.fromCharCode(+v[1]));
}, "");
},
});
detector.attach();
document.addEventListener("scanner", (e) => {
input.value = e.detail;
});
document.addEventListener("keyboard", (e) => {
console.log(e);
});