ReactJS - QR Code / Barcode Scanner Component

ReactJS based QR Code Scanner component, allowing you to detect and decode QR codes.

Table of contents

• Browser Support
• Getting started
• Usage
• Available Props
• Methods
• Want to Contribute?
• Collection of Components
• Changelog
• Credits
• License
• Keywords

Browser Support

83.0 ✔	77.0 ✔	13.1.1 ✔	83.0 ✔	Not supported

Getting started

Install the npm package:

npm install react-weblineindia-qrcode-scanner
#OR
yarn add react-weblineindia-qrcode-scanner

Usage

Use the <react-weblineindia-qrcode-scanner> component:

import React, { Component } from 'react'
import QrReader from 'react-weblineindia-qrcode-scanner'

class Test extends Component {
  constructor(props){
    super(props)
    this.state = {
      delay: 100,
      result: 'No result',
    }

    this.handleScan = this.handleScan.bind(this)
  }
  handleScan(data){
    this.setState({
      result: data,
    })
  }
  handleError(err){
    console.error(err)
  }
  render(){
    const previewStyle = {
      height: 240,
      width: 320,
    }

    return(
      <div>
        <QrReader
          delay={this.state.delay}
          style={previewStyle}
          onError={this.handleError}
          onScan={this.handleScan}
          />
        <p>{this.state.result}</p>
      </div>
    )
  }
}

For Next.js Use dynamic import instead of usual import.

import dynamic from 'next/dynamic'
const QrReader = dynamic(() => import('react-weblineindia-qrcode-scanner').then((a) => a.QrReader), {ssr: false});

Available Props

Prop	Type	default	Description
delay	number	500	The delay between scans in milliseconds. To disable the interval pass in false.
facingMode	string		Specify which camera direction should be used (if available). Options: front and rear.
legacyMode	boolean	false	If the device does not allow camera access (e.g. IOS Browsers, Safari) you can enable legacyMode to allow the user to take a picture (On a mobile device) or use an existing one. To trigger the image dialog just call the method openImageDialog from the parent component. Warning You must call the method from a user action (eg. click event on some element).
maxImageSize	number	1500	If legacyMode is active then the image will be downscaled to the given value while keepings its aspect ratio. Allowing larger images will increase the accuracy but it will also slow down the processing time.
style	object		Styling for the preview element. This will be a video or an img when legacymode is true. Warning The preview will keep its aspect ratio, to disable this set the CSS property objectFit to fill.
className	string		ClassName for the container element.
chooseDeviceId	function		Called when choosing which device to use for scanning. By default chooses the first video device matching facingMode, if no devices match the first video device found is choosen.

Methods

Name	Description
onScan	Scan event handler. Called every scan with the decoded value or null if no QR code was found.
onError	Function to call when an error occurs such as:- Not supported platform -The lack of available devices
onLoad	Called when the component is ready for use.
onImageLoad	Called when the image in legacyMode is loaded.

Want to Contribute?

• Created something awesome, made this code better, added some functionality, or whatever (this is the hardest part).
• Fork it.
• Create new branch to contribute your changes.
• Commit all your changes to your branch.
• Submit a pull request.

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Collection of Components

We have built many other components and free resources for software development in various programming languages. Kindly click here to view our Free Resources for Software Development

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Changelog

Detailed changes for each release are documented in CHANGELOG.md.

Credits

react-weblineindia-qrcode-scanner is inspired by react-qr-scanner.

License

MIT

Keywords

react-weblineindia-qrcode-scanner, qrcode, qrcode-reader, qrcode-scanner, webrtc, react-qrcode-scanner, barcode-scanner, react-barcode, reactjs-qr-code, reactjs-barcode