granite-qrcode-decoder

An element to decode a QR Code from an image. using a modified version of Lazersoft's jsqrcode library, to allow jsqrcode to deal with ShadowDOM

Polymer 2.x element

Doc & demo

The element can decode several sources of images:

• A dataURL, by using the dataUrl property
• An app-media-image-capture, by injecting it to the blob property
• A canvas, by calling the decodeCanvas method passing the canvas as parameter

https://lostinbrittany.github.io/granite-qrcode-decoder

Usage example

    <granite-qrcode-decoder
        last-decoded-data="{{data}}"
        data-url="data:image/jpeg;base64,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" 
        debug></granite-qrcode-decoder>
    Decoded QR code: [[data]]

Install

Install the component using Bower:

$ bower install LostInBrittany/granite-qrcode-decoder --save

Or download as ZIP.## Usage

1. Import Web Components' polyfill (if needed):

   <script src="bower_components/webcomponentsjs/webcomponents.min.js"></script>

2. Import Custom Element:

   <link rel="import" href="bower_components/granite-qrcode-scanner/granite-qrcode-decoder.html">

3. Start using it!

   <granite-qrcode-decoder>
   </granite-qrcode-decoder>

Contributing

1. Fork it!
2. Create your feature branch: git checkout -b my-new-feature
3. Commit your changes: git commit -m 'Add some feature'
4. Push to the branch: git push origin my-new-feature
5. Submit a pull request :D

License

MIT License