code-boxx/0-JS-QUEUE.MD

## 0-JS-QUEUE.MD

      
    Raw
  

              0-JS-QUEUE.MD
            
          
    JAVASCRIPT CUSTOMER QUEUE SYSTEM
https://code-boxx.com/javascript-customer-queue-system/
NOTES

It is best to have 2 monitors for this to work properly – One screen for the "admin", another to display the "current queue number".
Click on "ALL" to issue a queue number. Click on “NOW” to advance to the next customer.
Gist does not allow mp3 files, had to get creative... Save ding-dong.png below as ding-dong.mp3, or download your own notification sound.

IMAGES


LICENSE
Copyright by Code Boxx
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

  
## 1a-js-queue.html
<!DOCTYPE html>
<html>
  <head>
    <!-- TITLE + CHARSET + DESCRIPTION + VIEWPORT + FAVICON -->
    <title>JS Customer Queue</title>
    <meta charset="utf-8">
    <meta name="description" content="JS Customer Queue">
    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.5">
    <link rel="icon" href="favicon.png" type="image/png">

    <!-- ANDROID + CHROME + APPLE + WINDOWS APP -->
    <meta name="mobile-web-app-capable" content="yes">
    <meta name="theme-color" content="white">
    <link rel="apple-touch-icon" href="icon-512.png">
    <meta name="apple-mobile-web-app-capable" content="yes">
    <meta name="apple-mobile-web-app-status-bar-style" content="black">
    <meta name="apple-mobile-web-app-title" content="JS Queue">
    <meta name="msapplication-TileImage" content="icon-512.png">
    <meta name="msapplication-TileColor" content="#ffffff">

    <!-- WEB APP MANIFEST -->
    <!-- https://web.dev/add-manifest/ -->
    <link rel="manifest" href="3-manifest.json">

    <!-- SERVICE WORKER -->
    <script>
    if ("serviceWorker" in navigator) {
      navigator.serviceWorker.register("4-worker.js");
    }
    </script>

    <!-- STYLESHEET + JAVASCRIPT -->
    <link rel="stylesheet" href="2-js-queue.css">
    <script src="2-js-queue.js"></script>
  </head>
  <body>
    <!-- (A) CURRENT QUEUE NUMBER -->
    <div id="qNow" onclick="queue.next()">
      <div id="qNowNum">0</div>
      <div id="qNowTitle">NOW</div>
    </div>

    <!-- (B) TOTAL IN QUEUE -->
    <div id="qAll" onclick="queue.add()">
      <div id="qAllNum">0</div>
      <div id="qAllTitle">ALL</div>
    </div>
  </body>
</html>

## 1b-js-queue.html
<!DOCTYPE html>
<html>
  <head>
    <title>JS Customer Queue</title>
    <link rel="stylesheet" href="2-js-queue.css">
  </head>
  <body>
    <div id="qNowDis">0</div>
  </body>
</html>

## 2-js-queue.css
/* (A) WHOLE PAGE */
* {
  font-family: arial, sans-serif;
  box-sizing: border-box;
}
body {
  display: flex;
  padding: 0; margin: 0;
}

/* (B) "ADMIN" QUEUE PAGE */
#qNow, #qAll {
  width: 50%;
  text-align: center;
  cursor: pointer;
}
#qNow { background: #d7e4ff; }
#qAll { background: #ffd5d5; }
#qNowNum, #qAllNum, #qNowTitle, #qAllTitle { padding: 20px 0; }
#qNowNum, #qAllNum { font-size: 40px; }
#qNowTitle, #qAllTitle { font-size: 24px; }

/* (C) DISPLAY BOARD QUEUE NUMBER */
#qNowDis {
  display: flex;
  width: 100vw; height: 100vh;
  align-items: center; justify-content: center;
  font-size: 60px;
  font-weight: 700;
}

## 2-js-queue.js
var queue = {
  // (A) INIT
  now : 0,      // current queue number
  all : 0,      // total in queue
  alarm : null, // alarm sound
  hNow : null,  // html current queue number
  hAll : null,  // html total in queue
  hDis : null,  // html current queue number (display board)
  init : () => {
    // (A1) OPEN "DISPLAY BOARD"
    let board = window.open("1b-js-queue.html", "_blank", "popup");

    // (A2) GET HTML ELEMENTS
    queue.hNow = document.getElementById("qNowNum");
    queue.hAll = document.getElementById("qAllNum");
    board.onload = () => {
      queue.hDis = board.document.getElementById("qNowDis");
    };

    // (A3) LOAD ALARM SOUND
    queue.alarm = new Audio("ding-dong.mp3");
  },

  // (B) ADD CUSTOMER TO QUEUE
  add : () => {
    // (B1) ADD TO TOTAL QUEUE NUMBER
    queue.all++;
    queue.hAll.innerHTML = queue.all;

    // (B2) PRINT QUEUE NUMBER
    // possible to generate a new window with queue number
    // but print will always open the "select printer" dialog box
    /*
    let qslip = window.open();
    qslip.onload = () => {
      qslip.document.body.innerHTML = queue.all;
      qslip.print();
    };
    */
  },

  // (C) ADVANCE QUEUE NUMBER
  next : () => { if (queue.now < queue.all) {
    // (C1) ADD TO CURRENT QUEUE NUMBER
    queue.now++;
    queue.hNow.innerHTML = queue.now;
    queue.hDis.innerHTML = queue.now;

    // (C2) PLAY ALARM SOUND
    if (queue.alarm.paused) { queue.alarm.play(); }
    else { queue.alarm.currentTime = 0; }
  }}
};
window.addEventListener("load", queue.init);

## 3-manifest.json
{
  "short_name": "Queue",
  "name": "JS Queue",
  "icons": [{
    "src": "favicon.png",
    "sizes": "64x64",
    "type": "image/png"
  }, {
    "src": "icon-512.png",
    "sizes": "512x512",
    "type": "image/png"
  }],
  "start_url": "1a-js-queue.html",
  "scope": "/",
  "background_color": "white",
  "theme_color": "white",
  "display": "standalone"
}

## 4-worker.js
// (A) CREATE/INSTALL CACHE
self.addEventListener("install", evt => {
  self.skipWaiting();
  evt.waitUntil(
    caches.open("JSQueue")
    .then(cache => cache.addAll([
      "favicon.png",
      "icon-512.png",
      "ding-dong.mp3",
      "1a-js-queue.html",
      "1b-js-queue.html",
      "2-js-queue.js",
      "2-js-queue.css"
    ]))
    .catch(err => console.error(err))
  );
});

// (B) CLAIM CONTROL INSTANTLY
self.addEventListener("activate", evt => self.clients.claim());

// (C) LOAD FROM CACHE FIRST, FALLBACK TO NETWORK IF NOT FOUND
self.addEventListener("fetch", evt => evt.respondWith(
  caches.match(evt.request).then(res => res || fetch(evt.request))
));
	<!DOCTYPE html>
	<html>
	<head>
	<!-- TITLE + CHARSET + DESCRIPTION + VIEWPORT + FAVICON -->
	<title>JS Customer Queue</title>
	<meta charset="utf-8">
	<meta name="description" content="JS Customer Queue">
	<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.5">
	<link rel="icon" href="favicon.png" type="image/png">

	<!-- ANDROID + CHROME + APPLE + WINDOWS APP -->
	<meta name="mobile-web-app-capable" content="yes">
	<meta name="theme-color" content="white">
	<link rel="apple-touch-icon" href="icon-512.png">
	<meta name="apple-mobile-web-app-capable" content="yes">
	<meta name="apple-mobile-web-app-status-bar-style" content="black">
	<meta name="apple-mobile-web-app-title" content="JS Queue">
	<meta name="msapplication-TileImage" content="icon-512.png">
	<meta name="msapplication-TileColor" content="#ffffff">

	<!-- WEB APP MANIFEST -->
	<!-- https://web.dev/add-manifest/ -->
	<link rel="manifest" href="3-manifest.json">

	<!-- SERVICE WORKER -->
	<script>
	if ("serviceWorker" in navigator) {
	navigator.serviceWorker.register("4-worker.js");
	}
	</script>

	<!-- STYLESHEET + JAVASCRIPT -->
	<link rel="stylesheet" href="2-js-queue.css">
	<script src="2-js-queue.js"></script>
	</head>
	<body>
	<!-- (A) CURRENT QUEUE NUMBER -->
	<div id="qNow" onclick="queue.next()">
	<div id="qNowNum">0</div>
	<div id="qNowTitle">NOW</div>
	</div>

	<!-- (B) TOTAL IN QUEUE -->
	<div id="qAll" onclick="queue.add()">
	<div id="qAllNum">0</div>
	<div id="qAllTitle">ALL</div>
	</div>
	</body>
	</html>
	/* (A) WHOLE PAGE */
	* {
	font-family: arial, sans-serif;
	box-sizing: border-box;
	}
	body {
	display: flex;
	padding: 0; margin: 0;
	}

	/* (B) "ADMIN" QUEUE PAGE */
	#qNow, #qAll {
	width: 50%;
	text-align: center;
	cursor: pointer;
	}
	#qNow { background: #d7e4ff; }
	#qAll { background: #ffd5d5; }
	#qNowNum, #qAllNum, #qNowTitle, #qAllTitle { padding: 20px 0; }
	#qNowNum, #qAllNum { font-size: 40px; }
	#qNowTitle, #qAllTitle { font-size: 24px; }

	/* (C) DISPLAY BOARD QUEUE NUMBER */
	#qNowDis {
	display: flex;
	width: 100vw; height: 100vh;
	align-items: center; justify-content: center;
	font-size: 60px;
	font-weight: 700;
	}
	var queue = {
	// (A) INIT
	now : 0, // current queue number
	all : 0, // total in queue
	alarm : null, // alarm sound
	hNow : null, // html current queue number
	hAll : null, // html total in queue
	hDis : null, // html current queue number (display board)
	init : () => {
	// (A1) OPEN "DISPLAY BOARD"
	let board = window.open("1b-js-queue.html", "_blank", "popup");

	// (A2) GET HTML ELEMENTS
	queue.hNow = document.getElementById("qNowNum");
	queue.hAll = document.getElementById("qAllNum");
	board.onload = () => {
	queue.hDis = board.document.getElementById("qNowDis");
	};

	// (A3) LOAD ALARM SOUND
	queue.alarm = new Audio("ding-dong.mp3");
	},

	// (B) ADD CUSTOMER TO QUEUE
	add : () => {
	// (B1) ADD TO TOTAL QUEUE NUMBER
	queue.all++;
	queue.hAll.innerHTML = queue.all;

	// (B2) PRINT QUEUE NUMBER
	// possible to generate a new window with queue number
	// but print will always open the "select printer" dialog box
	/*
	let qslip = window.open();
	qslip.onload = () => {
	qslip.document.body.innerHTML = queue.all;
	qslip.print();
	};
	*/
	},

	// (C) ADVANCE QUEUE NUMBER
	next : () => { if (queue.now < queue.all) {
	// (C1) ADD TO CURRENT QUEUE NUMBER
	queue.now++;
	queue.hNow.innerHTML = queue.now;
	queue.hDis.innerHTML = queue.now;

	// (C2) PLAY ALARM SOUND
	if (queue.alarm.paused) { queue.alarm.play(); }
	else { queue.alarm.currentTime = 0; }
	}}
	};
	window.addEventListener("load", queue.init);
	{
	"short_name": "Queue",
	"name": "JS Queue",
	"icons": [{
	"src": "favicon.png",
	"sizes": "64x64",
	"type": "image/png"
	}, {
	"src": "icon-512.png",
	"sizes": "512x512",
	"type": "image/png"
	}],
	"start_url": "1a-js-queue.html",
	"scope": "/",
	"background_color": "white",
	"theme_color": "white",
	"display": "standalone"
	}
	// (A) CREATE/INSTALL CACHE
	self.addEventListener("install", evt => {
	self.skipWaiting();
	evt.waitUntil(
	caches.open("JSQueue")
	.then(cache => cache.addAll([
	"favicon.png",
	"icon-512.png",
	"ding-dong.mp3",
	"1a-js-queue.html",
	"1b-js-queue.html",
	"2-js-queue.js",
	"2-js-queue.css"
	]))
	.catch(err => console.error(err))
	);
	});

	// (B) CLAIM CONTROL INSTANTLY
	self.addEventListener("activate", evt => self.clients.claim());

	// (C) LOAD FROM CACHE FIRST, FALLBACK TO NETWORK IF NOT FOUND
	self.addEventListener("fetch", evt => evt.respondWith(
	caches.match(evt.request).then(res => res \|\| fetch(evt.request))
	));