1/* 2 * QR Code generator input demo (TypeScript) 3 * 4 * Copyright (c) Project Nayuki. (MIT License) 5 * https://www.nayuki.io/page/qr-code-generator-library 6 * 7 * Permission is hereby granted, free of charge, to any person obtaining a copy of 8 * this software and associated documentation files (the "Software"), to deal in 9 * the Software without restriction, including without limitation the rights to 10 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of 11 * the Software, and to permit persons to whom the Software is furnished to do so, 12 * subject to the following conditions: 13 * - The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * - The Software is provided "as is", without warranty of any kind, express or 16 * implied, including but not limited to the warranties of merchantability, 17 * fitness for a particular purpose and noninfringement. In no event shall the 18 * authors or copyright holders be liable for any claim, damages or other 19 * liability, whether in an action of contract, tort or otherwise, arising from, 20 * out of or in connection with the Software or the use or other dealings in the 21 * Software. 22 */ 23 24"use strict"; 25 26 27namespace app { 28 29 function initialize(): void { 30 getElem("loading").style.display = "none"; 31 getElem("loaded").style.removeProperty("display"); 32 let elems = document.querySelectorAll("input[type=number], textarea"); 33 for (let el of elems) { 34 if (el.id.indexOf("version-") != 0) 35 (el as any).oninput = redrawQrCode; 36 } 37 elems = document.querySelectorAll("input[type=radio], input[type=checkbox]"); 38 for (let el of elems) 39 (el as HTMLInputElement).onchange = redrawQrCode; 40 redrawQrCode(); 41 } 42 43 44 function redrawQrCode(): void { 45 // Show/hide rows based on bitmap/vector image output 46 const bitmapOutput: boolean = getInput("output-format-bitmap").checked; 47 const scaleRow : HTMLElement = getElem("scale-row"); 48 const svgXmlRow: HTMLElement = getElem("svg-xml-row"); 49 if (bitmapOutput) { 50 scaleRow.style.removeProperty("display"); 51 svgXmlRow.style.display = "none"; 52 } else { 53 scaleRow.style.display = "none"; 54 svgXmlRow.style.removeProperty("display"); 55 } 56 const svgXml = getElem("svg-xml-output") as HTMLTextAreaElement; 57 svgXml.value = ""; 58 59 // Reset output images in case of early termination 60 const canvas = getElem("qrcode-canvas") as HTMLCanvasElement; 61 const svg = (document.getElementById("qrcode-svg") as Element) as SVGElement; 62 canvas.style.display = "none"; 63 svg.style.display = "none"; 64 65 // Returns a QrCode.Ecc object based on the radio buttons in the HTML form. 66 function getInputErrorCorrectionLevel(): qrcodegen.QrCode.Ecc { 67 if (getInput("errcorlvl-medium").checked) 68 return qrcodegen.QrCode.Ecc.MEDIUM; 69 else if (getInput("errcorlvl-quartile").checked) 70 return qrcodegen.QrCode.Ecc.QUARTILE; 71 else if (getInput("errcorlvl-high").checked) 72 return qrcodegen.QrCode.Ecc.HIGH; 73 else // In case no radio button is depressed 74 return qrcodegen.QrCode.Ecc.LOW; 75 } 76 77 // Get form inputs and compute QR Code 78 const ecl: qrcodegen.QrCode.Ecc = getInputErrorCorrectionLevel(); 79 const text: string = (getElem("text-input") as HTMLTextAreaElement).value; 80 const segs: Array<qrcodegen.QrSegment> = qrcodegen.QrSegment.makeSegments(text); 81 const minVer: number = parseInt(getInput("version-min-input").value, 10); 82 const maxVer: number = parseInt(getInput("version-max-input").value, 10); 83 const mask: number = parseInt(getInput("mask-input").value, 10); 84 const boostEcc: boolean = getInput("boost-ecc-input").checked; 85 const qr: qrcodegen.QrCode = qrcodegen.QrCode.encodeSegments(segs, ecl, minVer, maxVer, mask, boostEcc); 86 87 // Draw image output 88 const border: number = parseInt(getInput("border-input").value, 10); 89 if (border < 0 || border > 100) 90 return; 91 if (bitmapOutput) { 92 const scale: number = parseInt(getInput("scale-input").value, 10); 93 if (scale <= 0 || scale > 30) 94 return; 95 qr.drawCanvas(scale, border, canvas); 96 canvas.style.removeProperty("display"); 97 } else { 98 const code: string = qr.toSvgString(border); 99 const viewBox: string = (/ viewBox="([^"]*)"/.exec(code) as RegExpExecArray)[1]; 100 const pathD: string = (/ d="([^"]*)"/.exec(code) as RegExpExecArray)[1]; 101 svg.setAttribute("viewBox", viewBox); 102 (svg.querySelector("path") as Element).setAttribute("d", pathD); 103 svg.style.removeProperty("display"); 104 svgXml.value = qr.toSvgString(border); 105 } 106 107 // Returns a string to describe the given list of segments. 108 function describeSegments(segs: Array<qrcodegen.QrSegment>): string { 109 if (segs.length == 0) 110 return "none"; 111 else if (segs.length == 1) { 112 const mode: qrcodegen.QrSegment.Mode = segs[0].mode; 113 const Mode = qrcodegen.QrSegment.Mode; 114 if (mode == Mode.NUMERIC ) return "numeric"; 115 if (mode == Mode.ALPHANUMERIC) return "alphanumeric"; 116 if (mode == Mode.BYTE ) return "byte"; 117 if (mode == Mode.KANJI ) return "kanji"; 118 return "unknown"; 119 } else 120 return "multiple"; 121 } 122 123 // Returns the number of Unicode code points in the given UTF-16 string. 124 function countUnicodeChars(str: string): number { 125 let result: number = 0; 126 for (let i = 0; i < str.length; i++, result++) { 127 const c: number = str.charCodeAt(i); 128 if (c < 0xD800 || c >= 0xE000) 129 continue; 130 else if (0xD800 <= c && c < 0xDC00 && i + 1 < str.length) { // High surrogate 131 i++; 132 const d: number = str.charCodeAt(i); 133 if (0xDC00 <= d && d < 0xE000) // Low surrogate 134 continue; 135 } 136 throw "Invalid UTF-16 string"; 137 } 138 return result; 139 } 140 141 // Show the QR Code symbol's statistics as a string 142 getElem("statistics-output").textContent = `QR Code version = ${qr.version}, ` + 143 `mask pattern = ${qr.mask}, ` + 144 `character count = ${countUnicodeChars(text)},\n` + 145 `encoding mode = ${describeSegments(segs)}, ` + 146 `error correction = level ${"LMQH".charAt(qr.errorCorrectionLevel.ordinal)}, ` + 147 `data bits = ${qrcodegen.QrSegment.getTotalBits(segs, qr.version) as number}.`; 148 } 149 150 151 export function handleVersionMinMax(which: "min"|"max"): void { 152 const minElem: HTMLInputElement = getInput("version-min-input"); 153 const maxElem: HTMLInputElement = getInput("version-max-input"); 154 let minVal: number = parseInt(minElem.value, 10); 155 let maxVal: number = parseInt(maxElem.value, 10); 156 minVal = Math.max(Math.min(minVal, qrcodegen.QrCode.MAX_VERSION), qrcodegen.QrCode.MIN_VERSION); 157 maxVal = Math.max(Math.min(maxVal, qrcodegen.QrCode.MAX_VERSION), qrcodegen.QrCode.MIN_VERSION); 158 if (which == "min" && minVal > maxVal) 159 maxVal = minVal; 160 else if (which == "max" && maxVal < minVal) 161 minVal = maxVal; 162 minElem.value = minVal.toString(); 163 maxElem.value = maxVal.toString(); 164 redrawQrCode(); 165 } 166 167 168 function getElem(id: string): HTMLElement { 169 const result: HTMLElement|null = document.getElementById(id); 170 if (result instanceof HTMLElement) 171 return result; 172 throw "Assertion error"; 173 } 174 175 176 function getInput(id: string): HTMLInputElement { 177 const result: HTMLElement = getElem(id); 178 if (result instanceof HTMLInputElement) 179 return result; 180 throw "Assertion error"; 181 } 182 183 184 initialize(); 185} 186