react-qr-reader/examples/legacy-mode.js

A react component for reading QR codes from the webcam.

import React, { Component } from 'react'
import QrReader from 'react-qr-reader'

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

    this.handleScan = this.handleScan.bind(this)
    this.openImageDialog = this.openImageDialog.bind(this)
  }
  handleScan(result){
    if(result){
      this.setState({ result })
    }
  }
  handleError(err){
    console.error(err)
  }
  openImageDialog() {
    this.refs.qrReader1.openImageDialog()
  }

  render(){
    const previewStyle = {
      height: 240,
      width: 320,
    }

    return(
      <div>
        <QrReader
          ref="qrReader1"
          delay={this.state.delay}
          style={previewStyle}
          onError={this.handleError}
          onScan={this.handleScan}
          legacyMode
        />
        <input type="button" value="Submit QR Code" onClick={this.openImageDialog} />
        <p>{this.state.result}</p>
      </div>
    )
  }
}