CODEWITHSUNDEEP
javascripthtml5-videoqr-codewebcambarcode-scanner
Dyan Bent
Dyan Bent

Reputation: 53

Qr & Barcode Reader javascript documentation for html5

I want to make an input where it can be automatically filled in after scanning a QR or barcode scanner using a webcam or phone cam.

for the script I imagined something like this

<video autoplay = "true" id = "video-webcam">
</video>

<input type = "text" id = "scanresult">

<script>
external or internal script for scan qr or barcode. save result in variable = result

html DOM getElementById ('scanresult'). value (result);
</script>

I hope anyone can give me suggestions or feedback for my problem. Thank you

Upvotes: 0

Views: 13536

Answers (2)

Amin Matola
Amin Matola

Reputation: 177

There are lots of better libraries out there for doing this, but I'd personally recommend QrScanner because of its simplicity and intuitiveness. Your live QrCode Scanner would be like this...

scanner.html

<div id="holder">
    <h3>Scan QR Code from Camera</h3>
    <div class="make">
        <video id="scan"></video>
    </div>
    <div>
        <input type = "text" id = "scanresult"><br>
        <button id="start">Start</button>
        <button id="stop">Stop</button>
    </div>
</div>

Then add a little CSS as:

style.css

#holder{
    width: 30%;
    margin:auto;
}

#holder .make {
    width: 99%;
    height: 30vh;
    margin-bottom: 15px;
    text-align: center;
}

video {
    width: 99%;
    margin:auto;
}

Then add your QrScanner code as:

<script type="module">
       import QrScanner from "/path/to/qr-scanner.min.js";
       QrScanner.WORKER_PATH = "/path/to/qr-scanner-worker.min.js";

       // Scanner Object
       const scanner    = new QrScanner(
                              document.getElementById("scan"), 
                              function(result){
                                   document.getElementById("scanresult").value = result;
                              } 
                           );
       
       document.getElementById("start").onclick = e => scanner.start();
       document.getElementById("stop").onclick = e => scanner.stop();

</script>

Then connect your camera and click start button...

Upvotes: 1

Dyan Bent
Dyan Bent

Reputation: 53

Before it thank you for JaromandaX, i have found script for barcode scanner on Html5 using webcam.

this is my index.html

<!DOCTYPE html>
<html>
  <head>
    <title>QR Code Scanner</title>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width; initial-scale=1.0; maximum-scale=1.0; user-scalable=0;" />
    <link rel="stylesheet" href="style.css" />
    <script src="https://rawgit.com/sitepoint-editors/jsqrcode/master/src/qr_packed.js"></script>
  </head>

  <body>
    <div id="container">
      <h1>QR Code Scanner</h1>

      <a id="btn-scan-qr">
        <img src="https://dab1nmslvvntp.cloudfront.net/wp-content/uploads/2017/07/1499401426qr_icon.svg">
      <a/>

      <canvas hidden="" id="qr-canvas"></canvas>

      <div id="qr-result" hidden="">
        <b>Data:</b> <span id="outputData"></span>
      </div>
    </div>

    <script src="qrCodeScanner.js"></script>
  </body>
</html>

qsCodeScanner.js

//const qrcode = window.qrcode;

const video = document.createElement("video");
const canvasElement = document.getElementById("qr-canvas");
const canvas = canvasElement.getContext("2d");

const qrResult = document.getElementById("qr-result");
const outputData = document.getElementById("outputData");
const btnScanQR = document.getElementById("btn-scan-qr");

let scanning = false;

qrcode.callback = res => {
  if (res) {
    outputData.innerText = res;
    scanning = false;

    video.srcObject.getTracks().forEach(track => {
      track.stop();
    });

    qrResult.hidden = false;
    canvasElement.hidden = true;
    btnScanQR.hidden = false;
  }
};

btnScanQR.onclick = () => {
  navigator.mediaDevices
    .getUserMedia({ video: { facingMode: "environment" } })
    .then(function(stream) {
      scanning = true;
      qrResult.hidden = true;
      btnScanQR.hidden = true;
      canvasElement.hidden = false;
      video.setAttribute("playsinline", true); // required to tell iOS safari we don't want fullscreen
      video.srcObject = stream;
      video.play();
      tick();
      scan();
    });
};

function tick() {
  canvasElement.height = video.videoHeight;
  canvasElement.width = video.videoWidth;
  canvas.drawImage(video, 0, 0, canvasElement.width, canvasElement.height);

  scanning && requestAnimationFrame(tick);
}

function scan() {
  try {
    qrcode.decode();
  } catch (e) {
    setTimeout(scan, 300);
  }
}

style.css

html {
  height: 100%;
}

body {
  font-family: sans-serif;
  padding: 0 10px;
  height: 100%;
  background: black;
  margin: 0;
}

h1 {
  color: white;
  margin: 0;
  padding: 15px;
}

#container {
  text-align: center;
  margin: 0;
}

#qr-canvas {
  margin: auto;
  width: calc(100% - 20px);
  max-width: 400px;
}

#btn-scan-qr {
  cursor: pointer;
}

#btn-scan-qr img {
  height: 10em;
  padding: 15px;
  margin: 15px;
  background: white;
}

#qr-result {
  font-size: 1.2em;
  margin: 20px auto;
  padding: 20px;
  max-width: 700px;
  background-color: white;
}

Upvotes: 1

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