Deleted hand-written JavaScript code in favor of compiling from TypeScript, updated directories and readme.
Project Nayuki
6 years ago
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/*
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* QR Code generator demo (JavaScript)
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*
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* Copyright (c) Project Nayuki. (MIT License)
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* https://www.nayuki.io/page/qr-code-generator-library
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of
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* this software and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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* the Software, and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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* - The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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* - The Software is provided "as is", without warranty of any kind, express or
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* implied, including but not limited to the warranties of merchantability,
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* fitness for a particular purpose and noninfringement. In no event shall the
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* authors or copyright holders be liable for any claim, damages or other
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* liability, whether in an action of contract, tort or otherwise, arising from,
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* out of or in connection with the Software or the use or other dealings in the
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* Software.
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*/
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"use strict";
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var app = new function() {
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function initialize() {
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var elems = document.querySelectorAll("input[type=number], textarea");
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for (var i = 0; i < elems.length; i++) {
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if (elems[i].id.indexOf("version-") != 0)
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elems[i].oninput = redrawQrCode;
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}
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elems = document.querySelectorAll("input[type=radio], input[type=checkbox]");
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for (var i = 0; i < elems.length; i++)
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elems[i].onchange = redrawQrCode;
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redrawQrCode();
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}
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function redrawQrCode() {
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// Show/hide rows based on bitmap/vector image output
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var bitmapOutput = document.getElementById("output-format-bitmap").checked;
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var scaleRow = document.getElementById("scale-row");
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var svgXmlRow = document.getElementById("svg-xml-row");
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if (bitmapOutput) {
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scaleRow.style.removeProperty("display");
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svgXmlRow.style.display = "none";
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} else {
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scaleRow.style.display = "none";
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svgXmlRow.style.removeProperty("display");
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}
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var svgXml = document.getElementById("svg-xml-output");
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svgXml.value = "";
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// Reset output images in case of early termination
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var canvas = document.getElementById("qrcode-canvas");
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var svg = document.getElementById("qrcode-svg");
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canvas.style.display = "none";
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svg.style.display = "none";
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// Returns a QrCode.Ecc object based on the radio buttons in the HTML form.
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function getInputErrorCorrectionLevel() {
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if (document.getElementById("errcorlvl-medium").checked)
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return qrcodegen.QrCode.Ecc.MEDIUM;
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else if (document.getElementById("errcorlvl-quartile").checked)
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return qrcodegen.QrCode.Ecc.QUARTILE;
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else if (document.getElementById("errcorlvl-high").checked)
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return qrcodegen.QrCode.Ecc.HIGH;
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else // In case no radio button is depressed
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return qrcodegen.QrCode.Ecc.LOW;
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}
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// Get form inputs and compute QR Code
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var ecl = getInputErrorCorrectionLevel();
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var text = document.getElementById("text-input").value;
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var segs = qrcodegen.QrSegment.makeSegments(text);
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var minVer = parseInt(document.getElementById("version-min-input").value, 10);
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var maxVer = parseInt(document.getElementById("version-max-input").value, 10);
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var mask = parseInt(document.getElementById("mask-input").value, 10);
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var boostEcc = document.getElementById("boost-ecc-input").checked;
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var qr = qrcodegen.QrCode.encodeSegments(segs, ecl, minVer, maxVer, mask, boostEcc);
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// Draw image output
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var border = parseInt(document.getElementById("border-input").value, 10);
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if (border < 0 || border > 100)
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return;
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if (bitmapOutput) {
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var scale = parseInt(document.getElementById("scale-input").value, 10);
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if (scale <= 0 || scale > 30)
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return;
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qr.drawCanvas(scale, border, canvas);
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canvas.style.removeProperty("display");
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} else {
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var code = qr.toSvgString(border);
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svg.setAttribute("viewBox", / viewBox="([^"]*)"/.exec(code)[1]);
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svg.querySelector("path").setAttribute("d", / d="([^"]*)"/.exec(code)[1]);
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svg.style.removeProperty("display");
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svgXml.value = qr.toSvgString(border);
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}
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// Returns a string to describe the given list of segments.
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function describeSegments(segs) {
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if (segs.length == 0)
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return "none";
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else if (segs.length == 1) {
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var mode = segs[0].mode;
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var Mode = qrcodegen.QrSegment.Mode;
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if (mode == Mode.NUMERIC ) return "numeric";
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if (mode == Mode.ALPHANUMERIC) return "alphanumeric";
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if (mode == Mode.BYTE ) return "byte";
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if (mode == Mode.KANJI ) return "kanji";
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return "unknown";
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} else
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return "multiple";
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}
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// Returns the number of Unicode code points in the given UTF-16 string.
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function countUnicodeChars(str) {
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var result = 0;
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for (var i = 0; i < str.length; i++, result++) {
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var c = str.charCodeAt(i);
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if (c < 0xD800 || c >= 0xE000)
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continue;
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else if (0xD800 <= c && c < 0xDC00 && i + 1 < str.length) { // High surrogate
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i++;
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var d = str.charCodeAt(i);
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if (0xDC00 <= d && d < 0xE000) // Low surrogate
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continue;
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}
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throw "Invalid UTF-16 string";
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}
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return result;
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}
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// Show the QR Code symbol's statistics as a string
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var stats = "QR Code version = " + qr.version + ", ";
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stats += "mask pattern = " + qr.mask + ", ";
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stats += "character count = " + countUnicodeChars(text) + ",\n";
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stats += "encoding mode = " + describeSegments(segs) + ", ";
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stats += "error correction = level " + "LMQH".charAt(qr.errorCorrectionLevel.ordinal) + ", ";
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stats += "data bits = " + qrcodegen.QrSegment.getTotalBits(segs, qr.version) + ".";
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document.getElementById("statistics-output").textContent = stats;
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}
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this.handleVersionMinMax = function(which) {
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var minElem = document.getElementById("version-min-input");
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var maxElem = document.getElementById("version-max-input");
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var minVal = parseInt(minElem.value, 10);
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var maxVal = parseInt(maxElem.value, 10);
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minVal = Math.max(Math.min(minVal, qrcodegen.QrCode.MAX_VERSION), qrcodegen.QrCode.MIN_VERSION);
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maxVal = Math.max(Math.min(maxVal, qrcodegen.QrCode.MAX_VERSION), qrcodegen.QrCode.MIN_VERSION);
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if (which == "min" && minVal > maxVal)
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maxVal = minVal;
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else if (which == "max" && maxVal < minVal)
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minVal = maxVal;
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minElem.value = minVal.toString();
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maxElem.value = maxVal.toString();
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redrawQrCode();
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}
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initialize();
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}
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