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[chrome][android] BarcodeDetector example
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| <!doctype html> | |
| <html> | |
| <head> | |
| <script src="https://cdn.jsdelivr.net/npm/@undecaf/[email protected]/dist/index.js"></script> | |
| <script src="https://cdn.jsdelivr.net/npm/@undecaf/[email protected]/dist/index.js"></script> | |
| <script> | |
| try { | |
| window['BarcodeDetector'].getSupportedFormats() | |
| } catch { | |
| window['BarcodeDetector'] = barcodeDetectorPolyfill.BarcodeDetectorPolyfill | |
| } | |
| </script> | |
| <script type="module"> | |
| // WICG Shape Detection API | |
| // - https://wicg.github.io/shape-detection-api/ | |
| try { | |
| const start = document.getElementById("start"); | |
| const video = document.getElementById("video"); | |
| const result = document.getElementById("result"); | |
| const bd = new BarcodeDetector(); | |
| (async () => { | |
| // It works on chrome on Android (chrome://flags Experimental Web Platform features) | |
| //NOTE: Not implemented yet: chrome canary 84 on macos | |
| result.textContent = (await BarcodeDetector.getSupportedFormats()).join("\n"); | |
| })().catch(err => { | |
| result.textContent = err; | |
| }); | |
| const capture = async () => { | |
| try { | |
| const barcodes = await bd.detect(video); | |
| const log = barcodes.map(({format, rawValue}) => `- ${format}: ${rawValue}`).join("\n"); | |
| if (log) result.textContent = log; | |
| requestAnimationFrame(capture); | |
| } catch (err) { | |
| console.error(err); | |
| } | |
| }; | |
| video.addEventListener("play", () => capture()); | |
| start.addEventListener("click", () => { | |
| start.disabled = true; | |
| (async () => { | |
| const media = await navigator.mediaDevices.getUserMedia( | |
| {auido: false, video: { | |
| //NOTE: crash on android chrome when specified the size | |
| //width: {ideal: 800}, height: {ideal: 800}, | |
| facingMode: "environment"}}); | |
| //console.log(media); | |
| video.srcObject = media; | |
| video.autoplay = true; | |
| })().catch(console.error); | |
| }, {once: true}); | |
| } catch (err) { | |
| document.getElementById("result").textContent = err; | |
| } | |
| </script> | |
| </head> | |
| <body> | |
| BarcodeDetector demo: <button id="start">start</button> | |
| <div><video id="video" autoplay></div> | |
| <pre id="result"></pre> | |
| </body> | |
| </html> |
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