Added File-input examples
Christoph Oberhofer
10 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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<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/styles.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>Working with file-input</h3>
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<p>This example let's you select an image from your local filesystem.
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QuaggaJS then tries to decode the barcode using
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the preferred method (<strong>Code128</strong> or <strong>EAN</strong>).
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There is no server interaction needed as the
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file is simply accessed through the <a
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href="http://www.w3.org/TR/file-upload/">File API</a>.</p>
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<p>This also works great on a wide range of mobile-phones where the camera
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access through <code>getUserMedia</code> is still very limited.</p>
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<div class="controls">
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<input type="file" capture/>
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<fieldset class="reader-group">
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<label>Code128</label>
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<input type="radio" name="reader" value="code_128"/>
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<label>EAN</label>
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<input type="radio" name="reader" value="ean"/>
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<label>Code39</label>
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<input type="radio" name="reader" value="code_39" checked/>
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</fieldset>
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</div>
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<div id="result_strip">
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<ul class="thumbnails"></ul>
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</div>
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<div id="interactive" class="viewport"></div>
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<div id="debug" class="detection"></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="../src/vendor/jquery-1.9.0.min.js" type="text/javascript"></script>
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<script src="../dist/quagga.js" type="text/javascript"></script>
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<script src="file_input.js" type="text/javascript"></script>
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</body>
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</html>
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@ -0,0 +1,75 @@
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$(function() {
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var App = {
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init: function() {
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App.attachListeners();
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},
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config: {
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reader: "code_39",
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length: 10
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},
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attachListeners: function() {
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$(".controls input[type=file]").on("change", function(e) {
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if (e.target.files && e.target.files.length) {
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App.decode(URL.createObjectURL(e.target.files[0]));
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}
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});
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$(".controls .reader-group").on("change", "input", function(e) {
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e.preventDefault();
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App.detachListeners();
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App.config.reader = e.target.value;
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App.init();
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});
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},
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detachListeners: function() {
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$(".controls input[type=file]").off("change");
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$(".controls .reader-group").off("change", "input");
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},
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decode: function(src) {
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Quagga.decodeSingle({
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decoder: {
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readers : [App.config.reader + '_reader']
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},
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locate : true,
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src : src
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}, function(result) {});
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}
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};
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App.init();
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Quagga.onProcessed(function(result) {
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var drawingCtx = Quagga.canvas.ctx.overlay,
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drawingCanvas = Quagga.canvas.dom.overlay;
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if (result) {
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if (result.boxes) {
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drawingCtx.clearRect(0, 0, parseInt(drawingCanvas.getAttribute("width")), parseInt(drawingCanvas.getAttribute("height")));
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result.boxes.filter(function (box) {
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return box !== result.box;
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}).forEach(function (box) {
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Quagga.ImageDebug.drawPath(box, {x: 0, y: 1}, drawingCtx, {color: "green", lineWidth: 2});
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});
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}
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if (result.box) {
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Quagga.ImageDebug.drawPath(result.box, {x: 0, y: 1}, drawingCtx, {color: "#00F", lineWidth: 2});
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}
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if (result.codeResult && result.codeResult.code) {
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Quagga.ImageDebug.drawPath(result.line, {x: 'x', y: 'y'}, drawingCtx, {color: 'red', lineWidth: 3});
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}
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}
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});
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Quagga.onDetected(function(result) {
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var code = result.codeResult.code,
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$node,
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canvas = Quagga.canvas.dom.image;
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$node = $('<li><div class="thumbnail"><div class="imgWrapper"><img /></div><div class="caption"><h4 class="code"></h4></div></div></li>');
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$node.find("img").attr("src", canvas.toDataURL());
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$node.find("h4.code").html(code);
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$("#result_strip ul.thumbnails").prepend($node);
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});
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});
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