angularx-qrcode

angularx-qrcode is an Ionic 3 and Angular4-7 QR Code component/module library to generate QR Codes (Quick Response) in your Ionic and Angular 4/5/6/7+ app with support for AOT. It is a drop-in replacement for the no-longer-maintained angular2 component ng2-qrcode and based on qrcodejs.

Demo App

An Angular app with a working implementation of angularx-qrcode is available on github.com/Cordobo/angularx-qrcode-sample-app.

Installation

# Angular 7+ and Ionic
npm install angularx-qrcode --save

# Angular 6/6.1 and Ionic
npm install angularx-qrcode@1.2.4 --save

# Angular 5
npm install angularx-qrcode@1.1.7 --save

# Angular 4
npm install angularx-qrcode@1.0.3 --save

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 QR code data string'" [size]="256" [level]="'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" [size]="256" [level]="'M'"></qrcode>

Parameters

Attribute	Type	Default	Description
allowEmptyString	Boolean	false	Allow empty string
colorlight	String	'#ffffff'	Light color
colordark	String	'#000000'	Dark Color
level	String	'M'	QR Correction level ('L', 'M', 'Q', 'H')
qrdata	String	''	String to encode
size	Number	256	Height/Width (any value)
usesvg	Boolean	false	SVG Output

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

See: HowTo use Angular QRCode with SSR

Available commands

# Build
npm run build

# Watch
npm run watch

Note

Depending on the size (amount of data) of the qrdata to encode, a minimum size is required.

Credits

Based on no-longer-maintained angular2 component https://github.com/PragmaticClub/ng2-qrcode

License

MIT License

Copyright (c) 2018, Andreas Jacob (Cordobo.com)