Fixed Events; Added example for multiple types of barcodes
Christoph Oberhofer
9 years ago
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8" />
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<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1" />
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<meta name="mobile-web-app-capable" content="yes">
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<meta name="apple-mobile-web-app-capable" content="yes">
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<title>index</title>
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<meta name="description" content="" />
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<meta name="author" content="Christoph Oberhofer" />
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<meta name="viewport" content="width=device-width; initial-scale=1.0" />
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<link rel="stylesheet" type="text/css" href="../css/fonts.css" />
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<link rel="stylesheet" type="text/css" href="../css/styles.css" />
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<link rel="stylesheet" type="text/css" href="./styles.css" />
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<link rel="stylesheet" type="text/css" href="../css/prism.css" />
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</head>
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<body>
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<header>
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<div class="headline">
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<h1>QuaggaJS</h1>
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<h2>An advanced barcode-scanner written in JavaScript</h2>
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</div>
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</header>
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<section id="container" class="container">
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<div class="controls">
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<h3>Scan various barcodes continously</h3>
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<button type="button" class="icon-barcode button scan">Start Scanning</button>
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<div class="readers">
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<label>
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<span>EAN-13</span>
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<input type="checkbox" checked name="ean_reader" />
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</label>
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<label>
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<span>EAN-8</span>
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<input type="checkbox" name="ean_8_reader" />
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</label>
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<label>
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<span>UPC-E</span>
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<input type="checkbox" name="upc_e_reader" />
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</label>
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<label>
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<span>Code 39</span>
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<input type="checkbox" checked name="code_39_reader" />
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</label>
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<label>
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<span>Codabar</span>
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<input type="checkbox" name="codabar_reader" />
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</label>
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<label>
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<span>Code 128</span>
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<input type="checkbox" checked name="code_128_reader" />
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</label>
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<label>
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<span>Interleaved 2 of 5</span>
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<input type="checkbox" name="i2of5_reader" />
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</label>
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</div>
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<p>
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Be aware that not all combinations play together nicely. Some
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codes do not have a checksum (e.g. ITF).
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</p>
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</div>
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<div class="overlay overlay--inline">
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<div class="overlay__content">
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<div class="overlay__close">X</div>
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</div>
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</div>
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</section>
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<ul class="results"></ul>
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<script src="../../dist/quagga.js" type="text/javascript"></script>
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<script src="index.js" type="text/javascript"></script>
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<script src="../vendor/prism.js"></script>
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</body>
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</html>
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var Quagga = window.Quagga;
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var App = {
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_lastResult: null,
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init: function() {
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this.attachListeners();
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},
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activateScanner: function() {
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var scanner = this.configureScanner('.overlay__content'),
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onDetected = function (result) {
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this.addToResults(result);
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}.bind(this),
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stop = function() {
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scanner.stop(); // should also clear all event-listeners?
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scanner.removeEventListener('detected', onDetected);
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this.hideOverlay();
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this.attachListeners();
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}.bind(this);
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this.showOverlay(stop);
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console.log("activateScanner");
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scanner.addEventListener('detected', onDetected).start();
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},
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addToResults: function(result) {
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if (this._lastResult === result.codeResult.code) {
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return;
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}
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this._lastResult = result.codeResult.code;
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var results = document.querySelector('ul.results'),
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li = document.createElement('li'),
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format = document.createElement('span'),
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code = document.createElement('span');
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li.className = "result";
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format.className = "format";
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code.className = "code";
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li.appendChild(format);
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li.appendChild(code);
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format.appendChild(document.createTextNode(result.codeResult.format));
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code.appendChild(document.createTextNode(result.codeResult.code));
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results.insertBefore(li, results.firstChild);
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},
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attachListeners: function() {
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var button = document.querySelector('button.scan'),
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self = this;
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button.addEventListener("click", function clickListener (e) {
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e.preventDefault();
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button.removeEventListener("click", clickListener);
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self.activateScanner();
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});
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},
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showOverlay: function(cancelCb) {
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document.querySelector('.container .controls')
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.classList.add('hide');
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document.querySelector('.overlay--inline')
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.classList.add('show');
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var closeButton = document.querySelector('.overlay__close');
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closeButton.addEventListener('click', function closeHandler() {
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closeButton.removeEventListener("click", closeHandler);
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cancelCb();
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});
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},
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hideOverlay: function() {
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document.querySelector('.container .controls')
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.classList.remove('hide');
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document.querySelector('.overlay--inline')
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.classList.remove('show');
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},
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querySelectedReaders: function() {
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return Array.prototype.slice.call(document.querySelectorAll('.readers input[type=checkbox]'))
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.filter(function(element) {
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return !!element.checked;
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})
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.map(function(element) {
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return element.getAttribute("name");
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});
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},
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configureScanner: function(selector) {
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var scanner = Quagga
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.decoder({readers: this.querySelectedReaders()})
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.locator({patchSize: 'medium'})
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.fromVideo({
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target: selector,
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constraints: {
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width: 600,
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height: 600,
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facingMode: "environment"
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}
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});
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return scanner;
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}
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};
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App.init();
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body {
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display: flex;
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flex-direction: column;
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padding-bottom: 0;
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height: 100%;
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box-sizing: border-box;
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}
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body > header {
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flex: 0 0 auto;
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padding: 0.5rem 1rem;
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}
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* {
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box-sizing: inherit;
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}
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header > .headline {
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display: flex;
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flex-direction: row;
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align-items: center;
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}
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.headline h1, .headline h2 {
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margin: 0;
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}
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.headline h2 {
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font-size: 1.3rem;
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text-align: right;
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}
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body > .container {
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margin: 0;
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flex: 1 1 auto;
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overflow-y: scroll;
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-webkit-overflow-scrolling: touch;
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position: relative;
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}
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/* Controls */
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/* Scan! Button */
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.icon-barcode.scan {
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font-size: x-large;
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padding: 0.5rem;
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text-align: center;
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margin: 0 auto;
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display: block;
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width: 70%;
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}
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.icon-barcode.scan:before {
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margin-right: 0.5rem;
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}
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/* Reader Checkboxes */
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.controls .readers {
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font-size: 1.3rem;
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width: 70%;
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margin: 2rem auto 0;
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}
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.controls .readers label {
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display: flex;
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flex-direction: row;
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align-items: center;
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}
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.controls .readers input {
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flex: 0 0 auto;
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height: 1.5rem;
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width: 1.5rem;
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}
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.controls .readers span {
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flex: 1 1 auto;
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}
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/* Results */
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body > .results {
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flex: 0 0 auto;
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display: flex;
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flex-direction: row;
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flex-wrap: nowrap;
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background-color: #DDD;
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margin: 0;
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padding: 0;
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list-style-type: none;
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padding: 0.25rem;
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overflow-x: scroll;
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-webkit-overflow-scrolling: touch;
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border-top: 1px solid #777;
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}
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.results > li {
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flex: 0 1 auto;
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margin: 0.25rem;
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background: #fff;
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border-radius: 2px;
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box-shadow: 0 3px 6px rgba(0,0,0,0.16), 0 3px 6px rgba(0,0,0,0.23);
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}
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.results:empty {
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display: none;
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}
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.result {
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display: flex;
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flex-direction: column;
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padding: 0.5rem;
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}
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.result > .format {
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font-weight: bold;
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}
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.result > .code {
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white-space: nowrap;
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overflow: hidden;
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text-overflow: ellipsis;
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}
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/* Scanner */
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.container .controls.hide {
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display: none;
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}
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.overlay--inline {
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position: absolute;
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display: none;
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}
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.overlay--inline.show {
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display: block;
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}
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