Created
January 5, 2021 10:15
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Google Chrome 83以降で正式対応になったBarcode Detection APIのテスト (うまく動かない)
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| var barcodeDetector = new BarcodeDetector({formats: ['qr_code']}); | |
| const bodyElement = document.getElementById('body'); | |
| bodyElement.ondragover = (event) => { | |
| event.stopPropagation(); | |
| event.preventDefault(); | |
| event.dataTransfer.dropEffect = 'copy'; | |
| }; | |
| bodyElement.ondrop = (event) => { | |
| event.stopPropagation(); | |
| event.preventDefault(); | |
| if(!('BarcodeDetector' in window)) { | |
| console.log("Barcode Detector not supported"); | |
| return; | |
| } | |
| const file = event.dataTransfer.files[0]; | |
| new Promise((resolve, reject) => { | |
| const reader = new FileReader(); | |
| reader.onload = (event) => { | |
| resolve(event.target.result); | |
| } | |
| reader.readAsDataURL(file); | |
| }).then((result) => { | |
| const image = new Image(); | |
| image.src = result; | |
| document.getElementById('barcode').insertAdjacentElement('beforeend', image); | |
| return barcodeDetector.detect(image); | |
| }).then((barcodes) => { | |
| const outputElement = document.getElementById('output'); | |
| if(barcodes.length == 0) { | |
| outputElement.insertAdjacentHTML('beforeend', '<li>barcode not decoded</li>'); | |
| } else { | |
| barcodes.forEach(barcode => outputElement.insertAdjacentHTML('beforeend', '<li>' + barcode.rawData + '</li>')); | |
| } | |
| }); | |
| }; |
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| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>Barcode Reader</title> | |
| </head> | |
| <body id="body"> | |
| <h1>Barcode Reader</h1> | |
| <p>バーコード画像をドラッグアンドドロップして下さい。</p> | |
| <h1>読み込んだ文字列</h1> | |
| <ul id="output"></ul> | |
| <div id="barcode"></div> | |
| </body> | |
| <script src="barcode.js"></script> | |
| </html> |
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