Barcode Scanner in ionic 2

Question

I am try to scan barcode using barcode scanner in android mobile using ionic2. I am a new learner of ionic. I tried some code,

home.ts

  import { Component } from '@angular/core';

  import { NavController } from 'ionic-angular';
  declare var cordova:any;
  @Component({
  selector: 'page-home',
  templateUrl: 'home.html'
  })
  export class HomePage {

  constructor(public navCtrl: NavController) {

  }

  scan() {
  var me = this;
  if (cordova.plugins.barcodeScanner) {
    cordova.plugins.barcodeScanner.scan((imageData) => {
        alert(imageData.text);

    }, (error) => {
        alert("An error happened -> " + error);         
    });
  }

  }
  }

home.html

  <ion-navbar *navbar>
  <ion-title>
    Home
  </ion-title>
  </ion-navbar>

 <ion-content class="home">
 <button primary (click)="scan()">Scan</button>
 </ion-content>

But I got an error is 'Cannot find variable: Cordova'.

I used this plugin -

https://ionicframework.com/docs/v2/native/barcode-scanner/

for barcode scanner in ionic2

Thank you for the answer.

Answer 1

You need to add:

import { BarcodeScanner } from 'ionic-native';

after that you can use BarcodeScanner.scan() methods to get the information from a barcode or qr code. Try this code: home.ts

import { Component } from '@angular/core';    
import { NavController } from 'ionic-angular';
import { BarcodeScanner } from 'ionic-native';

@Component({
  selector: 'page-home',
  templateUrl: 'home.html'
})
export class HomePage {

  constructor(public navCtrl: NavController) {}

  click() {
    BarcodeScanner.scan()
      .then((result) => {
        alert(
          "We got a barcode\n" +
          "Result: " + result.text + "\n" +
          "Format: " + result.format + "\n" +
          "Cancelled: " + result.cancelled
        )
      })
      .catch((error) => {
        alert(error);
      })
  }
}

home.html

<ion-header>
  <ion-navbar>
    <ion-title>
      Ionic Blank
    </ion-title>
  </ion-navbar>
</ion-header>

<ion-content padding>
  <h1>Scan</h1>
  <button block (click)="click()" color="primary">Scan</button>
</ion-content>

Answer 2

First do import to your project:

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

Component files:

import { Component } from '@angular/core';
import { NavController } from 'ionic-angular';
import { BarcodeScanner } from '@ionic-native/barcode-scanner';

@Component({
  selector: 'page-home',
  templateUrl: 'home.html',
  providers: [ BarcodeScanner ]
})
export class HomePage {

  constructor(
    private barcodeScanner: BarcodeScanner,
    public navCtrl: NavController) {

  }

  scan() {
   this.barcodeScanner.scan().then((barcodeData) => {
        console.log(JSON.stringify(barcodeData))
      }, (err) => {
       //error
      });
  }

}

Answer 3

1.

$ cordova plugin add phonegap-plugin-barcodescanner

$ npm install --save @ionic-native/barcode-scanner

2.

app.module.ts

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

   ......

   providers: [
     BarcodeScanner,
     {provide: ErrorHandler, useClass: IonicErrorHandler}
   ]
 })
 export class AppModule {}

---

scanner.ts

 import { Component } from '@angular/core';
 import { NavParams, NavController } from 'ionic-angular';
 import { BarcodeScanner } from '@ionic-native/barcode-scanner';

 @Component({
    selector: 'page-contact',
    templateUrl: 'contact.html'
 })
export class ContactPage {
    constructor( public nacCtrl: NavController,
    public NavParams: NavParams,
    private barcodeScanner: BarcodeScanner) { }

  takeScan(){
      this.barcodeScanner.scan().then((barcodeData) => {
      // Success! Barcode data is here
      alert(barcodeData.text);
      console.log("Barcode Format -> " + barcodeData.format);
      console.log("Cancelled -> " + barcodeData.cancelled);

   }, (err) => {
      // An error occurred
     console.log("An error happened -> " + err);
   });
 }

}

Answer 4

As in the docs you need to do this to use barcode scanner with ionic 2

import { BarcodeScanner } from 'ionic-native';

BarcodeScanner.scan().then((barcodeData) => {
    // Success! Barcode data is here
  }, (err) => {
   // An error occurred
});

After installing, you need to import it in your page from ionic-native and then call it to use its functions.

Hope it helps :D

Answer 5

For using Barcode Scanner you have to add

import { BarcodeScanner } from 'ionic-native';

and create a function like this

barcode() {
  BarcodeScanner.scan()
  .then((result) => {
     if (!result.cancelled) {
       alert("Success"+result);
     }
  })
  .catch((err) => {
    alert(err); 
   })
 }

now you can call barcode() function anywhere in html to scan

Answer 6

1.Add the plugin to your app see below

ionic plugin add phonegap-plugin-barcodescanner

npm install --save @ionic-native/barcode-scanner

2.import

import { BarcodeScanner } from 'ionic-native';

import * as xml2js from "xml2js";

3. BarcodeScanner.scan().then((barcodeData) => {

var name,uid;

xml2js.parseString(barcodeData.text,{trim: true}, function (err, result) { debugger;

name=result.PrintLetterBarcodeData.$.name; uid=result.PrintLetterBarcodeData.$.uid; });

debugger; this.AdharCardName=name; this.AdharcardUid=uid;
}, (err) => {

});

Answer 7

How to create perfect Barcode/QR Scanner. let's do it.

firstly,install

1. ionic cordova plugin add phonegap-plugin-barcodescanner
2. npm install --save @ionic-native/barcode-scanner
3. npm install @ionic-native/core --save
4. cordova platform update android

all are done..import BarcodeScanner in app.module.ts .like this
import { BarcodeScanner } from '@ionic-native/barcode-scanner';

providers: [ BarcodeScanner ]

after that, we must declare in typescript file which you'll use
import { BarcodeScanner } from '@ionic-native/barcode-scanner';

scan(){
      this.barcodeScanner.scan().then((barcodeData) => {
        console.log(JSON.stringify(barcodeData))  
      }, (err) => {  
       //error 
      });
    }

in this case. you can face like this errors,
ERR_FILE_NOT_FOUND (file:///android_asset/www/index.html): or
*Unexpected token ) in main.ts *
don't worry about it..remove android/ios plugin from command prompt. and install it.
cordova platform update android

I hope good new. spy