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160 lines
5.6 KiB
HTML
160 lines
5.6 KiB
HTML
<!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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<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="../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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<h3>Scan barcode to input-field</h3>
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<p>Click the <strong>button</strong> next to the input-field
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to start scanning an <strong>EAN-13</strong> barcode</p>
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<div>
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<form>
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<div class="input-field">
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<label for="isbn_input">EAN:</label>
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<input id="isbn_input" class="isbn" type="text" />
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<button type="button" class="icon-barcode button scan"> </button>
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</div>
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</form>
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</div>
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<p>This example demonstrates the following features:
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<ul>
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<li>Access to user's camera</li>
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<li>Configuring EAN-Reader</li>
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<li>Use custom mount-point (Query-Selector)</li>
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<li>Start/Stop scanning based on certain events</li>
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</ul>
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</p>
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<div class="source-code">
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<h4>Source</h4>
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<div class="collapsable-source">
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<pre>
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<code class="language-javascript">
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var Quagga = window.Quagga;
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var App = {
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_scanner: 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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document.querySelector('input.isbn').value = result.codeResult.code;
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stop();
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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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scanner.addEventListener('detected', onDetected).start();
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},
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attachListeners: function() {
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var self = this,
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button = document.querySelector('.input-field input + button.scan');
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button.addEventListener("click", function onClick(e) {
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e.preventDefault();
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button.removeEventListener("click", onClick);
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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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if (!this._overlay) {
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var content = document.createElement('div'),
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closeButton = document.createElement('div');
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closeButton.appendChild(document.createTextNode('X'));
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content.className = 'overlay__content';
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closeButton.className = 'overlay__close';
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this._overlay = document.createElement('div');
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this._overlay.className = 'overlay';
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this._overlay.appendChild(content);
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content.appendChild(closeButton);
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closeButton.addEventListener('click', function closeClick() {
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closeButton.removeEventListener('click', closeClick);
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cancelCb();
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});
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document.body.appendChild(this._overlay);
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} else {
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var closeButton = document.querySelector('.overlay__close');
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closeButton.addEventListener('click', function closeClick() {
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closeButton.removeEventListener('click', closeClick);
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cancelCb();
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});
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}
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this._overlay.style.display = "block";
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},
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hideOverlay: function() {
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if (this._overlay) {
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this._overlay.style.display = "none";
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}
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},
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configureScanner: function(selector) {
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if (!this._scanner) {
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this._scanner = Quagga
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.decoder({readers: ['ean_reader']})
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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: 800,
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height: 600,
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facingMode: "environment"
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}
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});
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}
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return this._scanner;
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}
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};
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App.init();
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</code>
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</pre>
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</div>
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<div class="collapsable-source">
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<pre>
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<code class="language-html">
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<form>
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<div class="input-field">
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<label for="isbn_input">EAN:</label>
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<input id="isbn_input" class="isbn" type="text" />
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<button type="button" class="icon-barcode button scan"> </button>
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</div>
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</form>
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</code>
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</pre>
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</div>
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</div>
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</section>
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<footer>
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<p>
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© Copyright by Christoph Oberhofer
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</p>
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</footer>
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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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