angularx-qrcode

angularx-qrcode is a fast and easy-to-use Ionic 3/4/5 and Angular4-11 QR Code component/module library to generate QR Codes (Quick Response) in your Ionic and Angular 4/5/6/7/8/9/10/11 app with support for AOT and the Ivy compiler and runtime. It is a drop-in replacement for the no-longer-maintained angular2 component ng2-qrcode and based on node-qrcode.

Demo App

An Angular app with a working implementation of angularx-qrcode is available as a project in this repository. Run the command

ng serve demo-app

and open the url http://localhost:4200/ in your browser

For versions prior to 11, a working app is available at github.com/Cordobo/angularx-qrcode-sample-app.

Install angularx-qrcode 11.0.x with Angular 11

Angular 11 requires angularx-qrcode 11:

# Angular 11 and Ionic
npm install angularx-qrcode --save
# Or use yarn
yarn add angularx-qrcode

Install angularx-qrcode 10.0.x with Angular 10

Starting with angularx-qrcode 10, major versions of angular and angularx-qrcode are synchronized, so angular 10 requires angularx-qrcode 10, making it easier to use the right version.

# Angular 10 and Ionic
npm install [email protected] --save
# Or use yarn
yarn add [email protected]

Install angularx-qrcode 2.3.x with Angular 9

# Angular 9 and Ionic
npm install angularx-qrcode@~2.3.5 --save
# Or use yarn
yarn add angularx-qrcode@~2.3.5

Install angularx-qrcode 2.1.x with Angular 8

# Angular 8 and Ionic
npm install angularx-qrcode@~2.1.4 --save
# Or use yarn
yarn add angularx-qrcode@~2.1.4

Older Angular Versions

# Angular 5/6/7
npm install [email protected] --save
# Angular 4
npm install [email protected] --save

New in angularx-qrcode 2.x

• Ivy Compiler and Runtime Support
• angularx-qrcode is now based on node-qrcode and ships a couple of new features (keeping all the known features)
• New: append CSS classes with cssClass
• New elementType field: url, img, canvas and svg
• New margin field. Define how wide the quiet zone should be.
• New scale, scale factor. A value of 1 means 1px per module (black dot).
• New version field. QR Code version. If not specified the most suitable value will be calculated.

Upgrade from 1.x to 2.x or 10.x

Upgrading should be simple. If any deprecated field is used, angularx-qrcode logs a warning to your browser console with the field name which should be renamed.

# Old code in 1.x
<qrcode [qrdata]="'Your data'" [size]="256" [level]="'M'" usesvg="true"></qrcode>

# New code in 2.x or 10.x
<qrcode [qrdata]="'Your data'" [width]="256" [errorCorrectionLevel]="'M'" [elementType]="'svg'"></qrcode>

Deprecated	New
colordark	colorDark
colorlight	colorLight
level	errorCorrectionLevel
size	width
usesvg	elementType

Basic Usage

Import the module and add it to your imports section in your main AppModule:

// File: app.module.ts
// all your imports
import { QRCodeModule } from 'angularx-qrcode';

@NgModule({
declarations: [
  AppComponent
],
imports: [
  QRCodeModule
],
providers: [],
bootstrap: [AppComponent]
})
export class AppModule { }

Examples: How to implement angularx-qrcode

Generate a QR Code from a string (directive only)

Now that Angular/Ionic knows about the new QR Code module, let's invoke it from our template with a directive. If we use a simple text-string, we need no additional code in our controller.

<qrcode [qrdata]="'Your data string'" [width]="256" [errorCorrectionLevel]="'M'"></qrcode>

Create a QR Code from a variable in your controller

In addition to our <qrcode>-directive in example.html, lets add two lines of code to our controller example.ts.

// File: example.ts
export class QRCodeComponent {
  public myAngularxQrCode: string = null;
  constructor () {
    // assign a value
    this.myAngularxQrCode = 'Your QR code data string';
  }
}

// File: example.html
<qrcode [qrdata]="myAngularxQrCode" [width]="256" [errorCorrectionLevel]="'M'"></qrcode>

Parameters

Attribute	Type	Default	Description
allowEmptyString	Boolean	false	Allow qrdata to be an empty string
colorDark	String	'#000000ff'	RGBA color, color of dark module
colorLight	String	'#ffffffff'	RGBA color, color of light module
cssClass	String	'qrcode'	CSS Class
elementType	String	'canvas'	'canvas', 'svg', 'img', 'url' (alias for 'img')
errorCorrectionLevel	String	'M'	QR Correction level ('L', 'M', 'Q', 'H')
margin	Number	4	Define how much wide the quiet zone should be.
qrdata	String	''	String to encode
scale	Number	4	Scale factor. A value of 1 means 1px per modules (black dots).
version	Number	(auto)	1-40
width	Number	10	Height/Width (any value)

Note

Depending on the amount of data of the qrdata to encode, a minimum width is required.

AOT - Ahead Of Time Compilation

angularx-qrcode supports AOT Compilation (Ahead-of-Time Compilation) which results in significant faster rendering. An AOT-enabled module is included. Further reading: https://angular.io/guide/aot-compiler

SSR - Server Side Rendering

As of version 1.6.0, SSR support is fully implemented, the following workaround is no longer needed. HowTo use Angular QRCode with SSR

Available commands

# Build
npm run build

Contribution

• Please open your PR against the development branch.
• Make sure your editor uses the packages .editorconfig file to minimize commited code changes.
• Use npm run lint before you commit

License

MIT License

Copyright (c) 2018 - present Andreas Jacob (Cordobo.com)