qcs
qr-code-scanner
npm i qr-code-scanner
qcs

qr-code-scanner

This project "cleans" some global variables and hardcoded IDs from the previous projects, also fixing some legacy problems. It is based on Lazar Laszlo's port of ZXing Java library

by Felipe Nascimento de Moura

1.0.8 (see all)License:MITTypeScript:Not FoundCategories:Vanilla JavaScript QR Code Scanner
npm i qr-code-scanner
Readme

QRCodeScanner

This is a SIMPLE qr-code-scanner that will allow you to open the user's camera, scan it and match a pattern or read the string out of the QR Code.

It is highly customizable for you to use it within your page's styles.

How it works

User will click a button, you will trigger the initiate method and a modal will open requesting permission to use the camera (only the first time).
The user will see the camera's output.
When a QRCode is found, it will trigger your onResult method and close the modal.
You can customize the modal and its layer.
You can use a regex to match only what you expect, ensuring the result will not be garbage.

How to use it:

You can require it, or use it as global:

    require(['qr-code-scanner'], function (QRScanner) {...})
    // OR
    window.QRScanner
  • The global QRScanner will only be created IF there is not require/define available in the page.

API

You will call the initiate method, sending the options, like so:

    QRScanner.initiate({
        match: /^[a-zA-Z0-9]{16,18}$/, // optional
        onResult: function (result) { console.info('DONE: ', result); },
        onError: function (err) { console.error('ERR :::: ', err); }, // optional
        onTimeout: function () { console.warn('TIMEOUT'); } // optional
    })

Options

In the options object, you can send:

  • onResult: A function to be triggered when a result is matched
  • onError: A function to be called in case of an error (or device not supported) [optional]
  • onTimeout: Your callback for the timeout event [optional]
  • match: A regular Expression matching what you expect to find in the QRCode (if found something but it does not match what you expected, it will not trigger the onResult) [optional]
  • timeout: A number in ms specifying for how long you will wait for a match. Default: 20000 [optional]
  • parent: The container where the video(from the camera) should be appended to. Default: document.body [optional]
  • lockLayerParent: The container on which the lock-layer will be appended. Default: document.body [optional]
  • className: A CSS class added to the video container. Default: QRScanner-container [optional]
  • lockLayerClassName: A CSS class added to the lockLayer container. Default: QRScanner-lock-layer [optional]
  • LockLayer is the darker layer behind the video.

Example

    import QRScanner from 'qr-code-scanner';

    QRScanner.initiate({
        onResult: (result) => { yourCustomCallback(result); },
        timeout: 10000,
    });

Legacy

This lib uses some ES6 features like let, const and arrow functions, but inherits the reader from Lazar Laszlo's port of ZXing Java library. This project "cleans" some things like global variables and hardcoded ids from the previous projects, fixing some legacy problems.

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VersionTagPublished
1.0.8
latest
2yrs ago
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