EasyQRCodeJS

EasyQRCodeJS is a powerful, cross-browser QR code generation library that uses JavaScript and runs on DOM-based client browsers. It can be downloaded directly in the browser. It supports Canvas, SVG, and Table drawing methods. It provides flexible configurations, including dot style, Logo, background image, color, title, and support for binary (HEX) data mode. It is also compatible with Angular, Vue.js, React, Next.js, and Svelte frameworks.

EasyQRCodeJS 是使用 JavaScript 的一个强大的、跨浏览器的二维码生成库。运行在基于 DOM 的客户端浏览器，并能够在浏览器中进行下载。它支持Canvas、SVG和Table绘图方法。提供灵活的配置，包括点样式、Logo、背景图片、彩色，标题和二进制（十六进制）数据模式支持。它还能与Angular、Vue.js、React、Next.js和Svelte框架兼容。

Table of contents

• EasyQRCodeJS
  • Table of contents
  • Choose what you need
  • Feature
  • Try It!
  • Demo preview
  • QR Code Structure
  • Installation
  • Load
  • Basic Usages
  • QRCode API
    • Object
    • Options
    • Method
  • Download the QRCode Image in the Browser
  • Angular Support
  • Vue.js Support
  • React Support
  • Next.js Support
  • Svelte Support
  • FQA
    • Q1. Tainted canvases may not be exported.
    • Q2. How to show the QRCode image only after rendering is done?
  • Browser Compatibility
  • License
  • EasyQRCodeJS-Premium
  • End

Choose what you need

Project	Support
EasyQRCodeJS	Running with DOM on CLIENT-SIDE . Browser(IE6+, Chrome, Firefox, Safari, Opera, Mobile Safari, Android, Windows Mobile, ETC.), Electron, NW.js, ETC.
EasyQRCodeJS-NodeJS	Running without DOM on SERVER-SIDE. Save image to file(PNG/JPEG/SVG) or get data url text. NodeJS, Electron, NW.js, ETC.
EasyQRCode-React-Native	A QRCode generator for React Native. Generate QRCode image or get base64 data url text.

Feature

• English

  • Cross-browser support for QR code generation based on HTML5 Canvas, SVG and Table

  • Support unicode character set: 😊❤️👍👨‍💻 Hello, こんにちは, こんにちは, Γεια, Привет, नमस्ते, สวัสดี, Привіт, سلام, Здравей, ສະບາຍດີ, Përshëndetje, Բարեւ, 你好

  • Download the QRCode image in the browser

  • Required Patterns that support dot style

  • Support for Quiet Zone settings

  • Support custom Position Pattern inner fill and outer border color

  • Support custom Alignment Pattern inner fill and outer border color

  • Support custom Timing Patterns vertical, horizontal color

  • Support Logo images (including transparent PNG images)

  • Support Background Image

  • Support for title, subtitle settings

  • Has no dependencies

  • Support AMD, CMD, CommonJS/Node.js JavaScript modules

  • Angular, Vue.js, React, Next.js, Svelte Support

  • Support binary(hex) data mode

  • Support TypeScript

• 中文

  • 跨浏览器，支持基于 HTML5 Canvas, SVG 和 Table 的二维码生成

  • 支持 Unicode 字符集: 😊❤️👍👨‍💻 Hello, こんにちは, こんにちは, Γεια, Привет, नमस्ते, สวัสดี, Привіт, سلام, Здравей, ສະບາຍດີ, Përshëndetje, Բարեւ, 你好

  • 在浏览器中下载

  • 支持点形风格的 Required Patterns

  • 支持 Quiet Zone 设置

  • 支持自定义 Position Pattern 内填充和外边框颜色

  • 支持自定义 Alignment Pattern 内填充和外边框颜色

  • 支持自定义 Timing Patterns 垂直，水平颜色

  • 支持 Logo 图片（包括背景透明的 PNG 图片）

  • 支持 Background Image 背景图片

  • 支持标题，副标题设置

  • 不依赖任何第三方

  • 支持 AMD，CMD, CommonJS/Node.js JavaScript 模块加载规范

  • Angular, Vue.js, React, NEXT.js, Svelte 支持

  • 二进制数据模式支持

  • TypeScript 支持

Try It!

Try It!

Demo preview

QR Code Structure

Installation

• Download install

  https://github.com/ushelp/EasyQRCodeJS

• Npm install

  1npm install easyqrcodejs

Load

• Script load

  1<script src="<PATH>/easy.qrcode.min.js" type="text/javascript" charset="utf-8"></script>
  2

• AMD load

  1require.config({
  2	paths: {
  3		QRCode: "<PATH>/easy.qrcode.min"
  4	}
  5});
  6
  7require(["QRCode"], function(QRCode){
  8	
  9	// Your code...
  10	
  11});

• Node.js load(For Example, Use in Electron)

  1const QRCode = require('<PATH>/easyqrcodejs');
  2
  3// Your code...

Basic Usages

1<div id="qrcode"></div>
2
3<script type="text/javascript">
4	// Options
5	var options = {
6		text: "https://github.com/ushelp/EasyQRCodeJS"
7	};
8	
9	// Create QRCode Object
10	new QRCode(document.getElementById("qrcode"), options);
11</script>

QRCode API

Object

1var qrcode = new QRCode(DOM_object, options_object);

Options

1 var options_object = {
2    // ====== Basic
3    text: "https://github.com/ushelp/EasyQRCodeJS",
4    width: 256,
5    height: 256,
6    colorDark : "#000000",
7    colorLight : "#ffffff",
8    correctLevel : QRCode.CorrectLevel.H, // L, M, Q, H
9    
10    // ====== dotScale
11    /*
12    dotScale: 1, // For body block, must be greater than 0, less than or equal to 1. default is 1
13    
14    dotScaleTiming: 1, // Dafault for timing block , must be greater than 0, less than or equal to 1. default is 1
15    dotScaleTiming_H: undefined, // For horizontal timing block, must be greater than 0, less than or equal to 1. default is 1
16    dotScaleTiming_V: undefined, // For vertical timing block, must be greater than 0, less than or equal to 1. default is 1
17    
18    dotScaleA: 1, // Dafault for alignment block, must be greater than 0, less than or equal to 1. default is 1
19    dotScaleAO: undefined, // For alignment outer block, must be greater than 0, less than or equal to 1. default is 1
20    dotScaleAI: undefined, // For alignment inner block, must be greater than 0, less than or equal to 1. default is 1
21    */
22   
23    // ====== Quiet Zone
24    /*
25    quietZone: 0,
26    quietZoneColor: "rgba(0,0,0,0)",
27    */
28
29    // ====== Logo
30    /*
31    logo: "../demo/logo.png", // Relative address, relative to `easy.qrcode.min.js`
32    logo: "http://127.0.0.1:8020/easy-qrcodejs/demo/logo.png", 
33    logoWidth: 80, // fixed logo width. default is `width/3.5`
34    logoHeight: 80, // fixed logo height. default is `heigth/3.5`
35    logoMaxWidth: undefined, // Maximum logo width. if set will ignore `logoWidth` value
36    logoMaxHeight: undefined, // Maximum logo height. if set will ignore `logoHeight` value
37    logoBackgroundColor: '#fffff', // Logo backgroud color, Invalid when `logBgTransparent` is true; default is '#ffffff'
38    logoBackgroundTransparent: false, // Whether use transparent image, default is false
39    */
40
41    // ====== Backgroud Image
42    /*
43    backgroundImage: '', // Background Image
44    backgroundImageAlpha: 1, // Background image transparency, value between 0 and 1. default is 1. 
45    autoColor: false, // Automatic color adjustment(for data block)
46    autoColorDark: "rgba(0, 0, 0, .6)", // Automatic color: dark CSS color
47    autoColorLight: "rgba(255, 255, 255, .7)", // Automatic color: light CSS color
48    */
49    
50    // ====== Colorful
51    // === Posotion Pattern(Eye) Color
52    /*
53    PO: '#e1622f', // Global Posotion Outer color. if not set, the defaut is `colorDark`
54    PI: '#aa5b71', // Global Posotion Inner color. if not set, the defaut is `colorDark`
55    PO_TL:'', // Posotion Outer color - Top Left 
56    PI_TL:'', // Posotion Inner color - Top Left 
57    PO_TR:'', // Posotion Outer color - Top Right 
58    PI_TR:'', // Posotion Inner color - Top Right 
59    PO_BL:'', // Posotion Outer color - Bottom Left 
60    PI_BL:'', // Posotion Inner color - Bottom Left 
61    */
62    // === Alignment Color
63    /*
64    AO: '', // Alignment Outer. if not set, the defaut is `colorDark`
65    AI: '', // Alignment Inner. if not set, the defaut is `colorDark`
66    */
67    // === Timing Pattern Color
68    /*
69    timing: '#e1622f', // Global Timing color. if not set, the defaut is `colorDark`
70    timing_H: '', // Horizontal timing color
71    timing_V: '', // Vertical timing color
72    */
73    
74    // ====== Title
75    /*
76    title: 'QR Title', // content 
77    titleFont: "normal normal bold 18px Arial", //font. default is "bold 16px Arial"
78    titleColor: "#004284", // color. default is "#000"
79    titleBackgroundColor: "#fff", // background color. default is "#fff"
80    titleHeight: 70, // height, including subTitle. default is 0
81    titleTop: 25, // draws y coordinates. default is 30
82    */
83   
84    // ====== SubTitle
85    /*
86    subTitle: 'QR subTitle', // content
87    subTitleFont: "normal normal normal 14px Arial", // font. default is "14px Arial"
88    subTitleColor: "#004284", // color. default is "4F4F4F"
89    subTitleTop: 40, // draws y coordinates. default is 0
90    */
91   
92    // ===== Event Handler
93    /*
94    onRenderingStart: undefined,
95    onRenderingEnd: undefined,
96    */
97   
98    // ===== Versions
99    /*
100    version: 0, // The symbol versions of QR Code range from Version 1 to Version 40. default 0 means automatically choose the closest version based on the text length.
101    */     
102   
103    // ===== Binary(hex) data mode
104    /*
105    binary: false, // Whether it is binary mode, default is text mode. 
106    */ 
107    
108    // ===== Tooltip
109    /*
110    tooltip: false, // Whether set the QRCode Text as the title attribute value of the QRCode div
111    */
112   
113    // ==== CORS
114    /*
115    crossOrigin: null, // String which specifies the CORS setting to use when retrieving the image. null means that the crossOrigin attribute is not set.
116    */
117   
118    // =====  Drawing method
119    /*
120    drawer: 'canvas', // Which drawing method to use. 'canvas', 'svg'. default is 'canvas'
121    */   
122   
123    // =====  UTF-8 without BOM
124    /*
125    utf8WithoutBOM: true
126    */   
127
128}

Option	Required	Type	Defaults	Description	Compatibility
Basic options	---	---	---	---	---
text	Y	String	''	Text
width	N	Number	256	Width
height	N	Number	256	Height
colorDark	N	String	#000000	Dark CSS color, rgba(0,0,0,0)
colorLight	N	String	#ffffff	Light CSS color, rgba(255,255,255,0)
correctLevel	N	Enum	QRCode.CorrectLevel.H	QRCode.CorrectLevel.H QRCode.CorrectLevel.Q QRCode.CorrectLevel.M QRCode.CorrectLevel.L
Dot style	---	---	---	---	---
dotScale	N	Number	1.0	Dot style scale. Ranges: 0-1.0
dotScaleTiming	N	Number	1.0	Dot style scale for timing. Ranges: 0-1.0
dotScaleTiming_V	N	Number	undefined	Dot style scale for horizontal timing. Ranges: 0-1.0
dotScaleTiming_H	N	Number	undefined	Dot style scale for vertical timing. Ranges: 0-1.0
dotScaleA	N	Number	1.0	Dot style scale for alignment. Ranges: 0-1.0
dotScaleAO	N	Number	undefined	Dot style scale for alignment outer. Ranges: 0-1.0
dotScaleAI	N	Number	undefined	Dot style scale for alignment inner. Ranges: 0-1.0
Quiet Zone	---	---	---	---	---
quietZoneColor	N	String	rgba(0,0,0,0)	Background CSS color to Quiet Zone
Quiet Zone	---	---	---	---	---
quietZone	N	Number	0	Quiet Zone size
quietZoneColor	N	String	rgba(0,0,0,0)	Background CSS color to Quiet Zone
Logo options	---	---	---	---	---
logo	N	String	undefined	Logo Image Path or Base64 encoded image. If use relative address, relative to easy.qrcode.min.js
logoWidth	N	Number	width/3.5	Fixed logo width.
logoHeight	N	Number	height/3.5	fixed logo height.
logoMaxWidth	N	Number	undefined	Maximum logo width. if set will ignore logoWidth value.
logoMaxHeight	N	Number	undefined	Maximum logo height. if set will ignore logoHeight value.
logoBackgroundTransparent	N	Boolean	false	Whether the background transparent image(PNG) shows transparency. When true, logoBackgroundColor is invalid
logoBackgroundColor	N	String	#ffffff	Set Background CSS Color when image background transparent. Valid when logoBackgroundTransparent is false
Backgroud Image options	---	---	---	---	---
backgroundImage	N	String	undefined	Background Image Path or Base64 encoded Image. If use relative address, relative to easy.qrcode.min.js
backgroundImageAlpha	N	Number	1.0	Background image transparency. Ranges: 0-1.0
autoColor	N	Boolean	false	Automatic color adjustment(for data block)
autoColorDark	N	String	rgba(0, 0, 0, .6)	Automatic color: dark CSS color
autoColorLight	N	String	rgba(255, 255, 255, .7)	Automatic color: light CSS color
Posotion Pattern Color options	---	---	---	---	---
PO	N	String	undefined	Global Posotion Outer CSS color. if not set, the defaut is colorDark
PI	N	String	undefined	Global Posotion Inner CSS color. if not set, the defaut is colorDark
PO_TL	N	String	undefined	Posotion Outer CSS color - Top Left
PI_TL	N	String	undefined	Posotion Inner CSS color - Top Left
PO_TR	N	String	undefined	Posotion Outer CSS color - Top Right
PI_TR	N	String	undefined	Posotion Inner CSS color - Top Right
PO_BL	N	String	undefined	Posotion Outer CSS color - Bottom Left
PI_BL	N	String	undefined	Posotion Inner CSS color - Bottom Left
Alignment Color options	---	---	---	---	---
AO	N	String	undefined	Alignment Outer CSS color. if not set, the defaut is colorDark
AI	N	String	undefined	Alignment Inner CSS color. if not set, the defaut is colorDark
Timing Pattern Color options	---	---	---	---	---
timing	N	String	undefined	Global Timing CSS color. if not set, the defaut is colorDark
timing_H	N	String	undefined	Horizontal timing CSS color
timing_V	N	String	undefined	Vertical timing CSS color
Title options	---	---	---	---	---
title	N	String	''
titleFont	N	String	normal normal bold 16px Arial	CSS Font
titleColor	N	String	#000000	CSS color
titleBackgroundColor	N	String	#ffffff	CSS color
titleHeight	N	Number	0	Title Height, Include subTitle
titleTop	N	Number	30	draws y coordinates.
SubTitle options	---	---	---	---	---
subTitle	N	String	''
subTitleFont	N	String	normal normal normal 14px Arial	CSS Font
subTitleColor	N	String	#4F4F4F	CSS color
subTitleTop	N	Number	0	draws y coordinates. default is 0
Event Handler options	---	---	---	---	---
onRenderingStart(qrCodeOptions)	N	Function	undefined	Callback function when the rendering start. can use to hide loading state or handling.
onRenderingEnd(qrCodeOptions, dataURL)	N	Function	undefined	Callback function when the rendering ends. dataURL parameter is the base64 data(canvas drawer) or SVG serialized text(svg drawer) of QRCode image(if not support canvas return null).
Version options	---	---	---	---	---
version	N	Number	0	The symbol versions of QR Code range from Version 1 to Version 40. default 0 means automatically choose the closest version based on the text length. Information capacity and versions of QR Codes NOTE: If you set a value less than the minimum version available for text, the minimum version is automatically used.
Tooltip options	---	---	---	---	---
tooltip	N	Boolean	false	Whether set the QRCode Text as the title attribute value of the QRCode div.
Binary(hex) data model options	---	---	---	---	---
binary	N	Boolean	false	Whether it is binary mode, default is text mode.
CORS options	---	---	---	---	---
crossOrigin	N	String	null	String which specifies the CORS setting to use when retrieving the image. null means that the crossOrigin attribute is not set. 'anonymous', null.
UTF-8 options	---	---	---	---	---
utf8WithoutBOM	N	Boolean	true	Use UTF-8 without BOM. set to false value will use BOM in UFT-8.
Drawing method options	---	---	---	---	---
drawer	N	String	canvas	Which drawing method to use. canvas, svg.	Chrome, FF, IE9+.

Method

• clear()

  1qrcode.clear(); // remove the code.

• makeCode(text)

  1qrcode.makeCode("https://github.com/ushelp/EasyQRCodeJS"); // make another code text.

• resize(width, height)

  1qrcode.resize(480, 480); // Resize the image 

• download(fileName)

  1qrcode.download("easyQRCode"); // Download the image or svg file, the filename does not need to include extension, '.png' or '.svg' suffix will be added automatically 

Download the QRCode Image in the Browser

For a long time, I have not been included to add a download function to our features, because due to browser environment restrictions, it cannot guarantee to truly fully output the image seen by the user.

On the other hand, I see many user demands related to downloading, and there are also different implementation methods, so I decide to provide a friendly and as fully-featured download implementation as possiable.

However, saving Canvas or SVG images on the client side is subject to many restrictions in the browser environments. For example, if your EasyQRCode image used an external image and there is a cross domain issue, you may be able to see the exernal image in the browser, but actully these images may not be able to be read normally and saved to your download file.

Therefore, if your requirement is to save the QRCode as an image, you may consider using EasyQRCodeJS-NodeJS on the server side to gain more complete control.

1
2<!-- QRCode -->
3<div id="qrcode"></div>
4<!-- Download button -->
5<button id="qrcode_download" onclick="downloadQRcode()" style="display:none">download</button>
6
7
8<script type="text/javascript">
9    var config = {
10        text: "www.easyproject.cn/donation",
11        //...
12        onRenderingEnd:function(options, dataURL){
13            // Display your download button after the EasyQRCode is rendered.
14            document.getElementById("qrcode_download").style.display='block';
15        }
16    }
17    // Initiate EasyQRCode 
18    var qrcode = new QRCode(document.getElementById("qrcode"), config);
19
20    function downloadQRcode(){
21         // Download the png image or svg file
22         // The '.png' or '.svg' suffix will be added to filename automatically 
23         var fileName = 'EasyQRCode-file'
24         qrcode.download(fileName);   
25    }
26</script>

Angular Support

1. Add dependency

   1# install with `npm`
   2npm install --save easyqrcodejs
   3
   4# Alternatively you may use `yarn`:
   5yarn add easyqrcodejs

2. [NAME].component.html

   1<!-- DOM Element-->
   2<div #qrcode></div>

3. Activate esModuleInterop in your tsconfig.json

   "esModuleInterop": true,
   

4. [NAME].component.ts

   1import { Component, AfterViewInit, ElementRef, ViewChild } from '@angular/core';
   2import QRCode from 'easyqrcodejs';
   3
   4@Component({
   5  selector: 'app-root',
   6  templateUrl: './app.component.html',
   7  styleUrls: ['./app.component.css']
   8})
   9export class AppComponent implements AfterViewInit{
   10    
   11  // Your DOM Element
   12  @ViewChild('qrcode', {static: false}) qrcode: ElementRef;
   13
   14  ngAfterViewInit(){
   15
   16    // Options
   17    var options = {
   18      text: "https://github.com/ushelp/EasyQRCodeJS"
   19    }
   20
   21    // Create new QRCode Object
   22    new QRCode(this.qrcode.nativeElement, options);
   23
   24  }
   25
   26  btnClick(){
   27    // ....
   28  }
   29
   30}

Vue.js Support

1. Add dependency

   1# install with `npm`
   2npm install --save easyqrcodejs
   3
   4# Alternatively you may use `yarn`:
   5yarn add easyqrcodejs

2. Template

   1<!-- DOM Element-->
   2<div ref="qrcode"></div>

3. Script

   1<script>
   2import * as QRCode from 'easyqrcodejs'   
   3 
   4export default {
   5
   6  mounted(){
   7    // Options
   8    var options = {
   9      text: "https://github.com/ushelp/EasyQRCodeJS"
   10    }
   11    
   12    // Create new QRCode Object
   13    new QRCode(this.$refs.qrcode, options);
   14  },
   15  methods:{
   16      btnClick(){
   17
   18      }
   19  }
   20}
   21</script>

React Support

1. Add dependency

   1# install with `npm`
   2npm install --save easyqrcodejs
   3
   4# Alternatively you may use `yarn`:
   5yarn add easyqrcodejs

2. Script

   • JavaScript

     1import React from 'react';
     2import './App.css';
     3import * as QRCode from 'easyqrcodejs';
     4
     5class App extends React.Component {
     6
     7    constructor(props) {
     8        super(props);
     9        this.qrcode = React.createRef();
     10    }
     11
     12    componentDidMount() {
     13        // Options
     14        var options = {
     15            text: "https://github.com/ushelp/EasyQRCodeJS"
     16        }
     17        // Create new QRCode Object
     18        new QRCode( this.qrcode.current, options);
     19    }
     20    render() {
     21        return ( 
     22        <div className = "App">
     23            <div ref={this.qrcode}></div> 
     24        </div>
     25        );
     26    }
     27}
     28
     29export default App;

   • TypeScript

     1import React, { useEffect } from "react";
     2import QRCode from "easyqrcodejs";
     3
     4function App() {
     5  const code = React.createRef<HTMLDivElement>();
     6
     7  useEffect(() => {
     8    new QRCode(code.current, { text: "https://github.com/ushelp/EasyQRCodeJS" });
     9  }, [code]);
     10
     11  return (
     12    <div className="App">
     13      <header className="App-header">
     14     
     15        <div ref={code}></div>
     16      </header>
     17    </div>
     18  );
     19}
     20
     21export default App;

Next.js Support

1. Add dependency

   Add easy.qrcode.min.js to your static files folder called static(<Next.js 9.1)/public(>=Next.js 9.1) in the root directory.

2. Script

   1import Layout from '../components/Layout';
   2// Import Head
   3import Head from "next/head";
   4
   5class About extends React.Component {
   6  constructor(props) {
   7    super(props);
   8    // QRCode DOM
   9    this.qrcodeDOM = React.createRef();
   10    // QRCode
   11    this.qrcode=null;
   12  }
   13  
   14  //QRCode generator
   15  generate(color){
   16      if(this.qrcode){
   17          this.qrcode.clear();
   18      }
   19      var options = {
   20          text: "https://github.com/ushelp/EasyQRCodeJS",
   21          colorDark : color?color:'#000000'
   22      };
   23      this.qrcode=new QRCode(this.qrcodeDOM.current, options);
   24  }
   25  
   26  // Gerenate QRCode on mount
   27  componentDidMount() { 
   28       this.generate()
   29  }
   30  
   31  render() {
   32    return (
   33      <Layout>
   34          <p>This is About page</p>
   35          {/* DOM */}
   36          <div ref={this.qrcodeDOM}></div>
   37          {/* Gerenate QRCode on click */}
   38          <button onClick={this.generate.bind(this, '#ff0000')}>QRCode Generate</button>
   39          {/* Include EasyQRCodeJS library*/}
   40          <Head>
   41           <script type="text/javascript" src="/public/easy.qrcode.min.js"></script>
   42         </Head>
   43           <p>This is About page</p>
   44      </Layout>
   45    );
   46  }
   47}
   48
   49export default About;

Svelte Support

1. Add dependency

   1# install with `npm`
   2npm install --save-dev easyqrcodejs
   3
   4# Alternatively you may use `yarn`:
   5yarn add easyqrcodejs --dev

2. Component template

   QR.svelte:

   1<script>
   2 import { onMount } from 'svelte';
   3 import QRCode from 'easyqrcodejs'
   4 // import * as QRCode from 'easyqrcodejs';
   5
   6  export let codeValue;
   7  let node;
   8
   9  onMount(() => {
   10    const options = {
   11      text: codeValue,
   12      // ... your other options
   13      width: 100,
   14      height: 100,
   15      quietZone: 10,
   16    };
   17    new QRCode(node, options);
   18  });
   19</script>
   20
   21<div bind:this={node}></div>
   22
   23<style>
   24 div {
   25   /* make QR-wrapper squared */
   26    width: 100%;
   27    position: relative;
   28    padding: 50%;
   29    z-index: 1;
   30  }
   31  div :global(canvas) {
   32    /* fit QR to wrapper */
   33    width: 100%;
   34    height: 100%;
   35    position: absolute;
   36    left: 0;
   37    top: 0;
   38  }
   39</style>

3. Layout

   index.svelte:

   1<script>
   2  import QR from './QR.svelte';
   3</script>
   4
   5<div class="qr-container">
   6  <QR text="Your awesome text here..." />
   7</div>
   8
   9<style>
   10  .qr-container {
   11    /* your styles for container here */
   12  }
   13</style>

FQA

Q1. Tainted canvases may not be exported.

When use canvas drawer, Canvas toDataURL function does not allow load cross domain image. there are three options to slove this problem:

• Option 1:

  Configure the crossOrigin attribute(crossorigin) for the image. Make sure that CORS is configured on the Server side.

  1{
  2   // ...
  3 
  4   // String which specifies the CORS setting to use when retrieving the image. null means that the crossOrigin attribute is not set. 'anonymous', null.
  5   crossOrigin : 'anonymous',
  6 
  7   // ... 
  8}

• Option 2:

  Put your image under the same domain with your page.

• Option 3:

  Use base64 image.

Q2. How to show the QRCode image only after rendering is done?

1onRenderingStart: function(qrCodeOptions) {
2    qrCodeOptions._element.style.display = 'none';
3},
4onRenderingEnd: function(qrCodeOptions) {
5    qrCodeOptions._element.style.display = 'block';
6},

Browser Compatibility

IE6+, Chrome, Firefox, Safari, Opera, Mobile Safari, Android, Windows Mobile, ETC.

License

MIT License

EasyQRCodeJS-Premium

Let you draw freely!

EasyQRCodeJS-Premium is a more powerful and comprehensive enterprise version. You can use Canvas to customize any element, such as eye frame shape, eyeball shape, QR code block shape, and more. Also supports excavation (to prevent the QRcode overlap with the logo), random block mode.

If you need more functions, we can provide you with customized development of API libraries or products. please contact me to buy the business enterprise edition.

EasyQRCodeJS-Premium 是功能更加强大和全面的商业/企业版本。让您可以在 QRCode 中通过 Canvas 自定义任何喜欢的元素，例如 Eye frame 形状, Eye ball 形状, QR Body block 形状等等。 还支持 Logo 挖取（excavation，防止二维码与 Logo 重叠）和 Random bolock mode.

如果您需要更多功能，我们可以为您提供 API 库或产品的定制开发。请联系我购买商业/企业版本。

End

Email：inthinkcolor@gmail.com

http://www.easyproject.cn

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