我想进行一个输入，在使用网络摄像头或手机摄像头扫描 QR 或条形码扫描仪后可以自动填写。
对于剧本我想象的是这样的
<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>
我希望任何人都可以针对我的问题向我提供建议或反馈。 谢谢你
在此之前感谢 JaromandaX， 我找到了使用网络摄像头在 Html5 上进行条形码扫描仪的脚本。
这是我的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);
}
}
样式.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;
}
有很多更好的库可以做到这一点，但我个人推荐QrScanner，因为它简单且直观。 你的实时二维码扫描仪会是这样的......
<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>
然后添加一点CSS：
#holder{
width: 30%;
margin:auto;
}
#holder .make {
width: 99%;
height: 30vh;
margin-bottom: 15px;
text-align: center;
}
video {
width: 99%;
margin:auto;
}
然后添加您的 QrScanner 代码：
<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>
然后连接相机并单击开始按钮...