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index.html
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<html lang="zh-TW">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<title>qr</title>
<script src='https://cdn.frankychen.net/legacy/vendor/jquery/jquery.min.js'></script>
<script src="https://cdn.frankychen.net/legacy/vendor/bootstrap/js/bootstrap.bundle.min.js"></script>
<script src="https://cdn.frankychen.net/legacy/vendor/jquery-easing/jquery.easing.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/sweetalert2@9"></script>
</head>
<!--!
Copyright 2020 Franky Chen
Licensed under MIT (https://github.com/franky920920/QRcode_JavaScript_Scanner/blob/master/LICENSE)
-->
<body>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/webrtc-adapter/3.3.3/adapter.min.js"></script>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.1.10/vue.min.js"></script>
<script type="text/javascript" src="https://rawgit.com/schmich/instascan-builds/master/instascan.min.js"></script>
<div class="container">
<div id="app">
<section class="cameras">
<h3>
<button id="cam_list_control" class="btn btn-primary" onclick="toggle_btn()">攝影機選擇</button>
</h3>
<ul id="cam_list">
<li v-if="cameras.length === 0" class="empty">No cameras found</li>
<li v-for="camera in cameras">
<button class="btn btn-default" style="margin: 1%">
<span v-if="camera.id == activeCameraId" :title="formatName(camera.name)" class="active">{{ formatName(camera.name) }}</span>
<span v-if="camera.id != activeCameraId" :title="formatName(camera.name)">
<a @click.stop="selectCamera(camera)">{{ formatName(camera.name) }}</a>
</span>
</button>
</li>
</ul>
</section>
<section class="scans">
<h2>Scans</h2>
<ul v-if="scans.length === 0">
<li class="empty">No scans yet</li>
</ul>
<transition-group name="scans" tag="ul">
<li v-for="scan in scans" :key="scan.date" :title="scan.content">{{ scan.content }}</li>
</transition-group>
</section>
<div class="preview-container">
<video id="preview" style="display: none;"></video>
<canvas id="previewCanvas"></canvas>
</div>
</div>
</div>
<script>
let opts = {
continuous: true
, video: document.getElementById('preview')
, mirror: false
,
};
var app = new Vue({
el: '#app'
, data: {
scanner: null
, activeCameraId: null
, cameras: []
, scans: []
}
, mounted: function () {
var self = this;
self.scanner = new Instascan.Scanner({
video: document.getElementById('preview')
, scanPeriod: 1
, continuous: true
, mirror: false
});
self.scanner.addListener('scan', function (content, image) {
self.scans.unshift({
date: +(Date.now())
, content: content
});
dataProcess(content);
});
Instascan.Camera.getCameras()
.then(function (cameras) {
self.cameras = cameras;
if (cameras.length > 0) {
self.activeCameraId = cameras[0].id;
self.scanner.start(cameras[0]);
} else {
console.error('No cameras found.');
}
})
.catch(function (e) {
console.error(e);
});
}
, methods: {
formatName: function (name) {
return name || '(unknown)';
}
, selectCamera: function (camera) {
this.activeCameraId = camera.id;
this.scanner.start(camera);
}
}
});
function dataProcess(data) {
console.log(data);
}
function toggle_btn() {
$(document).ready(function () {
$("#cam_list").toggle();
});
}
//canvas
var canvas = document.getElementById('previewCanvas');
var ctx = canvas.getContext('2d');
var video = document.getElementById('preview');
video.addEventListener('loadedmetadata', function() {
canvas.width = video.videoWidth;
canvas.height = video.videoHeight;
});
video.addEventListener('play', function() {
var $this = this; //cache
(function loop() {
if (!$this.paused && !$this.ended) {
ctx.drawImage($this, 0, 0);
setTimeout(loop, 1000 / 30); // drawing at 30fps
}
})();
}, 0);
</script>
</body>