How to integrate a barcode reader into an Angular 4 application

I currently find myself in the process of integrating a barcode scanner into my Angular 4 project, with the assistance of this plugin - https://github.com/isonet/angular-barcode-scanner.

Within my scanner.component.ts page, I have included:

import { Component, OnInit } from '@angular/core';
import 'angular-barcode-scanner';

In my app.module.ts file:

...
import { BarcodeScanner} from 'angular-barcode-scanner';

@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule,
    FormsModule,
    HttpModule,
    RouterModule.forRoot(routes),
    LoginModule,
    SignupModule,
    DashboardModule,
    ReactiveFormsModule,
    BarcodeScanner
  ],
  providers: [
    DataService,
    TokenService
  ],
  bootstrap: [AppComponent]
})
export class AppModule { }

Furthermore, within my scanner.component.html file:

<barcode-scanner separator-char="separatorChar" trigger-char="triggerChar" scan-callback="scanCallback"
            trigger-callback="triggerCallback"></barcode-scanner>
    </div>
</div>

However, upon execution, I encounter the following errors in console:

Uncaught ReferenceError: angular is not defined
at Object.defineProperty.value (angular-barcode-scanner.js:1)
at r (angular-barcode-scanner.js:1)
...

If anyone can provide any insight or help regarding this matter, it would be greatly appreciated.

Answer №1

QuaggaJS is a JavaScript-based barcode scanner that offers real-time localization and decoding of various types of barcodes including

EAN, CODE 128, CODE 39, EAN 8, UPC-A, UPC-C, I2of5, 2of5, CODE 93, and CODABAR
. The library can utilize getUserMedia to access the user's camera stream directly, and even modern smartphones are capable of efficiently locating and decoding barcodes in real-time.

Explore an example of using QuaggaJS with

Angular for barcode scanning here
.

NPM Angular module for integrating barcode scanning in Angular applications:

import { ChangeDetectorRef, Component, OnInit } from '@angular/core';
import Quagga from 'quagga';

// Rest of the code goes here
#interactive.viewport {
    position: relative;
    width: 100%;
    height: auto;
    /* CSS styles go here */
}

// More CSS styles go here
<div>
  <ngb-alert type="info" [dismissible]="false">
      <strong>Scanning in progress:</strong> Scanning the barcode to view promotions.
  </ngb-alert>
</div>

// More HTML code snippets go here

</div>

GitHub Reference Link

Answer №2

Check out this AngularJS(V1) application which allows for barcode scanning. However, since you are working on an Angular(V4 possibly?) project, using <barcode-scanner> may not be as straightforward.

Answer №3

Recently, Chrome introduced the innovative Shape Detection API as part of their version 83 update. This includes the Barcode Detector API, which can be extremely beneficial for developers targeting Chrome users. In fact, I highly recommend utilizing the ng-barcode-detector package specifically tailored for this purpose.

Answer №4

Angular 10 provides support for the ngx-barcode-scanner module

Documentation: https://github.com/julienboulay/ngx-barcode-scanner

import { Component, ViewChild, AfterViewInit } from "@angular/core";
import { BarecodeScannerLivestreamComponent } from "ngx-barcode-scanner";

@Component({
  selector: "demo-app",
  template: `
    <barcode-scanner-livestream
      type="code_128"
      (valueChanges)="onValueChanges($event)"
      (started)="(onStarted)"
    ></barcode-scanner-livestream>
    <div [hidden]="!barcodeValue">
      {{ barcodeValue }}
    </div>
  `,
})
export class Demo implements AfterViewInit {
  @ViewChild(BarecodeScannerLivestreamComponent)
  barecodeScanner: BarecodeScannerLivestreamComponent;

  barcodeValue;

  ngAfterViewInit() {
    this.barecodeScanner.start();
  }

  onValueChanges(result) {
    this.barcodeValue = result.codeResult.code;
  }

  onStarted(started) {
    console.log(started);
  }
}

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