IONIC 4 QR CODE GENERATOR EXAMPLE

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Hello All, In the last topic we had discussed the Ionic 4 OCR ( Optical Character Recognition ) example. Today we will discuss the Ionic 4 QR code generator with the help of an example. We are going to use phonegap-plugin-barcodescanner. Before we start the implementation make sure that all software & dependencies are installed. Create a new project using Ionic 4 & do follow the below steps to implement the QR code scanner in Ionic 4.

Steps to follow to implement Ionic 4 QR code generator example

1. Create a new page in Ionic 4 project by using CLI (Command Line Interface)

ionic g page qrcode-generator

2. Add Plugin & Dependency as shown below

ionic cordova plugin add phonegap-plugin-barcodescanner
npm install @ionic-native/barcode-scanner

3. Add dependency to app.module.ts

After adding the plugin & npm dependency, We have to add them into our app.module.ts

import { BarcodeScanner } from '@ionic-native/barcode-scanner/ngx';

Add the dependency into providers as shown below

@NgModule({
  declarations: [AppComponent],
  entryComponents: [],
  imports: [BrowserModule, IonicModule.forRoot(), AppRoutingModule, HttpClientModule],
  providers: [
    StatusBar,
    SplashScreen,
    BarcodeScanner,
    { provide: RouteReuseStrategy, useClass: IonicRouteStrategy }
  ],
  bootstrap: [AppComponent]
})

The full app.module.ts will look like this

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { RouteReuseStrategy } from '@angular/router';
 
import { IonicModule, IonicRouteStrategy } from '@ionic/angular';
import { SplashScreen } from '@ionic-native/splash-screen/ngx';
import { StatusBar } from '@ionic-native/status-bar/ngx';
 
import { AppComponent } from './app.component';
import { AppRoutingModule } from './app-routing.module';
 
import { HttpClientModule } from '@angular/common/http';
import { BarcodeScanner } from '@ionic-native/barcode-scanner/ngx';
 
 
@NgModule({
  declarations: [AppComponent],
  entryComponents: [],
  imports: [BrowserModule, IonicModule.forRoot(), AppRoutingModule, HttpClientModule],
  providers: [
    StatusBar,
    SplashScreen,
    BarcodeScanner,
    { provide: RouteReuseStrategy, useClass: IonicRouteStrategy }
  ],
  bootstrap: [AppComponent]
})
export class AppModule { }

4. Create a button in newly created HTML page qrcode-generator.page.html

<ion-header>
  <ion-toolbar>
    <ion-title>QR Code Generator</ion-title>
  </ion-toolbar>
</ion-header>

<ion-content>
  <ion-list>
    <ion-item>
      <ion-label>Generate QR For</ion-label>
      <ion-input type="text" [(ngModel)]="siteName"></ion-input>
    </ion-item>
    <ion-item>
      <ion-button (click)="generateQR()">Generate QR Code</ion-button>
    </ion-item>
  </ion-list>
</ion-content>

5. Add below code to get the QR Code from Text ( We are passing URL as a String here )

generateQR() {
    this.qr.encode(this.qr.Encode.TEXT_TYPE,this.siteName).then(data => {
      console.log(data);
      this.siteName = data;
    }).catch(err => {
      console.log('Error : ', err);
    });
  }

As seen in above code, We are encoding the TEXT_TYPE string & will generate the QR code for the same. Therefore, We are passing the TEXT_TYPE as a first parameter for the encode function.

Our full qrcode.generator.page.ts will look like this

import { Component, OnInit } from '@angular/core';
import { BarcodeScanner } from "@ionic-native/barcode-scanner/ngx";


@Component({
  selector: 'app-qrcode-generator',
  templateUrl: './qrcode-generator.page.html',
  styleUrls: ['./qrcode-generator.page.scss'],
})
export class QrcodeGeneratorPage implements OnInit {

  siteName : string = "https://developmobileapplications.com/";

  constructor(private qr: BarcodeScanner) { }

  ngOnInit() {
  }

  generateQR() {
    this.qr.encode(this.qr.Encode.TEXT_TYPE,this.siteName).then(data => {
      console.log(data);
      this.siteName = data;
    }).catch(err => {
      console.log('Error : ', err);
    });
  }

}

The output is as shown below

As seen in above images we can able to generate QR code in Ionic 4 application. Now, We will discuss the infinite scroll in Ionic in next Ionic 4 post.