ngx-scanner-qrcode

This library is built to provide a solution scanner QR code.
This library takes in raw images and will locate, extract and parse any QR code found within.
This demo Github, Stackblitz.

Supported Barcode Types
QR Code	Code-39	Code-93	Code-128
Codabar	Databar/Expanded	EAN/GTIN-5/8/13	ISBN-10/13
ISBN-13+2	ISBN-13+5	ITF (Interleaved 2 of 5)	UPC-A/E.

Installation

Install ngx-scanner-qrcode from npm:

npm install ngx-scanner-qrcode@<version> --save

Add wanted package to NgModule imports:

import { NgxScannerQrcodeModule, LOAD_WASM } from 'ngx-scanner-qrcode';

// Necessary to solve the problem of losing internet connection
LOAD_WASM().subscribe();

@NgModule({
    imports: [
        NgxScannerQrcodeModule
    ]
})

angular.json

{
  "architect": {
    "build": {
      "options": {
        "assets": [
          /* Necessary to solve the problem of losing internet connection */
          {
            "glob": "**/*",
            "input": "node_modules/ngx-scanner-qrcode/wasm/", 
            "output": "./assets/wasm/"
          }
        ]
      }
    }
  }
}

In the Component:

<!-- For camera -->
<ngx-scanner-qrcode #action="scanner"></ngx-scanner-qrcode>

<!-- data  -->
<span>{{ action.data.value | json }}</span><!-- value -->
<span>{{ action.data | async | json }}</span><!-- async -->

<!-- Loading -->
<p *ngIf="action.isLoading">⌛ Loading...</p>

<!-- start -->
<button (click)="action.isStart ? action.stop() : action.start()">{{action.isStart ? 'Stop' : 'Start'}}</button>

Image src

<!-- For image src -->
<ngx-scanner-qrcode #action="scanner" [src]="'https://domain.com/test.png'"></ngx-scanner-qrcode>

<span>{{ action.data.value | json }}</span><!-- value -->
<span>{{ action.data | async | json }}</span><!-- async -->

Select files

<!-- For select files -->
<input #file type="file" (change)="onSelects(file.files)" [multiple]="'multiple'" [accept]="'.jpg, .png, .gif, .jpeg'"/>

<div *ngFor="let item of qrCodeResult">
  <ngx-scanner-qrcode #actionFile="scanner" [src]="item.url" [config]="config"></ngx-scanner-qrcode>
  <p>{{ actionFile.data.value | json }}</p><!-- value -->
  <p>{{ actionFile.data | async | json }}</p><!-- async -->
</div>

import { Component } from '@angular/core';
import { NgxScannerQrcodeService, ScannerQRCodeSelectedFiles } from 'ngx-scanner-qrcode';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent {
  public qrCodeResult: ScannerQRCodeSelectedFiles[] = [];

  public config: ScannerQRCodeConfig = {
    constraints: { 
      video: {
        width: window.innerWidth
      }
    } 
  };

  constructor(private qrcode: NgxScannerQrcodeService) { }

  public onSelects(files: any) {
    this.qrcode.loadFiles(files).subscribe((res: ScannerQRCodeSelectedFiles[]) => {
      this.qrCodeResult = res;
    });
  }
}

Select files to Scan

<!-- For select files -->
<input #file type="file" (change)="onSelects(file.files)" [multiple]="'multiple'" [accept]="'.jpg, .png, .gif, .jpeg'"/>

<div *ngFor="let item of qrCodeResult">
  <img [src]="item.url | safe: 'url'" [alt]="item.name" style="max-width: 100%"><!-- Need bypassSecurityTrustUrl -->
  <p>{{ item.data | json }}</p>
</div>

import { Component } from '@angular/core';
import { NgxScannerQrcodeService, ScannerQRCodeSelectedFiles } from 'ngx-scanner-qrcode';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent {
  public qrCodeResult: ScannerQRCodeSelectedFiles[] = [];

  public config: ScannerQRCodeConfig = {
    constraints: { 
      video: {
        width: window.innerWidth
      }
    } 
  };

  constructor(private qrcode: NgxScannerQrcodeService) { }

  public onSelects(files: any) {
    this.qrcode.loadFilesToScan(files).subscribe((res: ScannerQRCodeSelectedFiles[]) => {
      this.qrCodeResult = res;
    });
  }
}

API Documentation

Input

Field	Description	Type	Default
[src]	image url	string	-
[fps]	fps/ms	number	30
[vibrate]	vibrate for mobile	number	300
[decode]	decode value	string	utf-8
[isBeep]	beep	boolean	true
[constraints]	setting video	MediaStreamConstraints	{audio:false,video:true}
[canvasStyles]	setting canvas	CanvasRenderingContext2D[]	[{ lineWidth: 1, strokeStyle: 'green', fillStyle: '#55f02880' },{ font: '15px serif', strokeStyle: '#fff0', fillStyle: '#ff0000' }]
[config]	config	ScannerQRCodeConfig	{src:..,fps..,vibrate..,decode:..,isBeep:..,config:..,constraints:..,canvasStyles:..}

Ouput

Field	Description	Type	Default
(event)	data response	BehaviorSubject<ScannerQRCodeResult[]>	[]

Component exports

Field	Description	Type	Default
isStart	status	boolean	false
isLoading	status	boolean	false
isTorch	torch	boolean	false
isPause	status	boolean	-
isReady	status wasm	AsyncSubject	-
data	data response	BehaviorSubject<ScannerQRCodeResult[]>	[]
devices	data devices	BehaviorSubject<ScannerQRCodeDevice[]>	[]
deviceIndexActive	device index	number	0
---	---	---	---
(start)	start camera	AsyncSubject	-
(stop)	stop camera	AsyncSubject	-
(play)	play video	AsyncSubject	-
(pause)	pause video	AsyncSubject	-
(torcher)	toggle on/off flashlight	AsyncSubject	-
(applyConstraints)	set media constraints	AsyncSubject	-
(getConstraints)	get media constraints	AsyncSubject	-
(playDevice)	play deviceId	AsyncSubject	-
(loadImage)	load image from src	AsyncSubject	-
(download)	download image	AsyncSubject<ScannerQRCodeSelectedFiles[]>	-

Service

Field	Description	Type	Default
(loadFiles)	Convert files	AsyncSubject<ScannerQRCodeSelectedFiles[]>	[]
(loadFilesToScan)	Scanner files	AsyncSubject<ScannerQRCodeSelectedFiles[]>	[]

Models

ScannerQRCodeConfig

interface ScannerQRCodeConfig {
  src?: string;
  fps?: number;
  vibrate?: number; /** support mobile */
  decode?: string;
  isBeep?: boolean;
  constraints?: MediaStreamConstraints;
  canvasStyles?: CanvasRenderingContext2D[];
}

ScannerQRCodeDevice

interface ScannerQRCodeDevice {
  kind: string;
  label: string;
  groupId: string;
  deviceId: string;
}

ScannerQRCodeResult

class ScannerQRCodeResult {
  type: ScannerQRCodeSymbolType;
  typeName: string;
  data: Int8Array;
  points: Array<ScannerQRCodePoint>;
  orientation: ScannerQRCodeOrientation;
  time: number;
  cacheCount: number;
  quality: number;
  value: string;
}

enum ScannerQRCodeSymbolType {
  ScannerQRCode_NONE = 0,   /**< no symbol decoded */
  ScannerQRCode_PARTIAL = 1,   /**< intermediate status */
  ScannerQRCode_EAN2 = 2,   /**< GS1 2-digit add-on */
  ScannerQRCode_EAN5 = 5,   /**< GS1 5-digit add-on */
  ScannerQRCode_EAN8 = 8,   /**< EAN-8 */
  ScannerQRCode_UPCE = 9,   /**< UPC-E */
  ScannerQRCode_ISBN10 = 10,  /**< ISBN-10 (from EAN-13). @since 0.4 */
  ScannerQRCode_UPCA = 12,  /**< UPC-A */
  ScannerQRCode_EAN13 = 13,  /**< EAN-13 */
  ScannerQRCode_ISBN13 = 14,  /**< ISBN-13 (from EAN-13). @since 0.4 */
  ScannerQRCode_COMPOSITE = 15,  /**< EAN/UPC composite */
  ScannerQRCode_I25 = 25,  /**< Interleaved 2 of 5. @since 0.4 */
  ScannerQRCode_DATABAR = 34,  /**< GS1 DataBar (RSS). @since 0.11 */
  ScannerQRCode_DATABAR_EXP = 35,  /**< GS1 DataBar Expanded. @since 0.11 */
  ScannerQRCode_CODABAR = 38,  /**< Codabar. @since 0.11 */
  ScannerQRCode_CODE39 = 39,  /**< Code 39. @since 0.4 */
  ScannerQRCode_PDF417 = 57,  /**< PDF417. @since 0.6 */
  ScannerQRCode_QRCODE = 64,  /**< QR Code. @since 0.10 */
  ScannerQRCode_SQCODE = 80,  /**< SQ Code. @since 0.20.1 */
  ScannerQRCode_CODE93 = 93,  /**< Code 93. @since 0.11 */
  ScannerQRCode_CODE128 = 128, /**< Code 128 */

  /*
   * Please see _ScannerQRCode_get_symbol_hash() if adding
   * anything after 128
   */

  /** mask for base symbol type.
   * @deprecated in 0.11, remove this from existing code
   */
  ScannerQRCode_SYMBOL = 0x00ff,
  /** 2-digit add-on flag.
   * @deprecated in 0.11, a ::ScannerQRCode_EAN2 component is used for
   * 2-digit GS1 add-ons
   */
  ScannerQRCode_ADDON2 = 0x0200,
  /** 5-digit add-on flag.
   * @deprecated in 0.11, a ::ScannerQRCode_EAN5 component is used for
   * 5-digit GS1 add-ons
   */
  ScannerQRCode_ADDON5 = 0x0500,
  /** add-on flag mask.
   * @deprecated in 0.11, GS1 add-ons are represented using composite
   * symbols of type ::ScannerQRCode_COMPOSITE; add-on components use ::ScannerQRCode_EAN2
   * or ::ScannerQRCode_EAN5
   */
  ScannerQRCode_ADDON = 0x0700,
}

interface ScannerQRCodePoint {
  x: number;
  y: number;
}

enum ScannerQRCodeOrientation {
  ScannerQRCode_ORIENT_UNKNOWN = -1,  /**< unable to determine orientation */
  ScannerQRCode_ORIENT_UP,            /**< upright, read left to right */
  ScannerQRCode_ORIENT_RIGHT,         /**< sideways, read top to bottom */
  ScannerQRCode_ORIENT_DOWN,          /**< upside-down, read right to left */
  ScannerQRCode_ORIENT_LEFT,          /**< sideways, read bottom to top */
}

ScannerQRCodeSelectedFiles

interface ScannerQRCodeSelectedFiles {
  url: string;
  name: string;
  file: File;
  data?: ScannerQRCodeResult[];
  canvas?: HTMLCanvasElement;
}

Support versions

Support versions
Angular 16+	1.6.8
Angular 6+	1.6.6

Author Information

Author Information
Author	DaiDH
Phone	+84845882882
Country	Vietnam

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LGPL-2.1+ License. Copyright (C) 1991, 1999 Free Software Foundation, Inc.