Webcam-driven HTML5 QR code scanner.
<!DOCTYPE html>
<html>
<head>
<title>Instascan</title>
<script type="text/javascript" src="dist/instascan.min.js"></script>
</head>
<body>
<video id="monitor"></video>
<script type="text/javascript">
var opts = {
monitor: document.getElementById('monitor'),
mirror: true,
backgroundScan: false,
refractoryPeriod: 3 * 1000,
scanPeriod: 5,
captureImage: false
};
var scanner = new Instascan.Scanner(opts);
scanner.addListener('scan', function (content, image) {
console.log(content);
});
Instascan.Camera.getCameras(function (err, cameras) {
if (cameras && cameras.length > 0) {
scanner.start(cameras[0]);
}
});
</script>
</body>
</html>
new Instascan.Scanner(opts)opts.monitor: The HTML element to use for the camera's video preview. Must be a <video> element. By default, an invisible element will be created.opts.mirror: Whether to mirror the video preview. Default true.opts.backgroundScan: Whether to scan when the tab is not shown/focused. When false, this reduces CPU usage when the page is not active. Default false.opts.refractoryPeriod: The period, in milliseconds, before the same QR code will be consecutively recognized. Default 5000.opts.scanPeriod: The period, in rendered frames, between scans. A lower scan period increases CPU usage but makes scan response faster. Default 1 (i.e. analyze every frame).opts.captureImage: Whether to include the scanned image data as part of the scan result. See the scan event for format details. Default false.scanner.start(camera)camera as the source.camera: Instance of Instascan.Camera from Instascan.Camera.getCameras.scanner.stop()scanner.addListener('scan', callback)callback: function (content, image)content: Scanned content decoded from the QR code.image: null if scanner.captureImage is false, otherwise, a base64-encoded WebP-compressed data URI of the camera frame used to decode the QR code.scanner.addListener('active', callback)scanner.start or the tab gaining focus.callback: function ()scanner.addListener('inactive', callback)scanner.stop or the tab losing focus.callback: function ()scanner.addListener('error', callback)callback: function (err)err: Error details.Instascan.Camera.getCameras(callback)callback: function (err, cameras)err: Any errors that occurred when enumerating cameras.cameras: Array of Instascan.Camera instances available for use.camera.idcamera.nameMicrosoft Lifecam HD-3000.Copyright © 2016 Chris Schmich
MIT License. See LICENSE for details.
FAQs
Webcam-driven QR code scanner.
The npm package instascan receives a total of 7,798 weekly downloads. As such, instascan popularity was classified as popular.
We found that instascan demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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