code-boxx/0-JS-FLASHCARDS.MD

## 0-JS-FLASHCARDS.MD

      
    Raw
  

              0-JS-FLASHCARDS.MD
            
          
    JAVASCRIPT FLASHCARDS PWA

https://code-boxx.com/javascript-flashcards/
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.

  
## 1-flashcard.html
<!DOCTYPE html>
<html>
  <head>
    <!-- TITLE + CHARSET + DESCRIPTION + VIEWPORT + FAVICON -->
    <title>JS Flashcards</title>
    <meta charset="utf-8">
    <meta name="description" content="Offline Javascript Flashcards">
    <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="Offline JS Flashcards">
    <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("3-worker.js");
    }
    </script>

    <!-- STYLESHEET + JAVASCRIPT -->
    <link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">
    <link rel="stylesheet" href="2-flashcard.css">
    <script src="2-flashcard.js"></script>
  </head>
  <body>
    <!-- (A) MAIN MENU -->
    <div id="screenA">
      <div class="mItem" onclick="cards.view('v')">
        <div class="mi">view_array</div>
        <div class="mTxt">View Cards</div>
      </div>
      <div class="mItem" onclick="cards.view('m')">
        <div class="mi">edit</div>
        <div class="mTxt">Manage Cards</div>
      </div>
    </div>

    <!-- (B) MANAGE/VIEW CARDS -->
    <div id="screenB" class="hide">
      <!-- (B1) CARDS WRAPPER -->
      <div id="bCard"></div>

      <!-- (B2) CONTROLS -->
      <div id="bManage">
        <div class="mi" onclick="cards.screen(0)">reply</div>
        <div class="mi bManage" onclick="cards.delete()">clear</div>
        <div class="mi bManage" onclick="cards.add()">add</div>
        <div class="mi" onclick="cards.move()">navigate_before</div>
        <div class="mi" onclick="cards.move(1)">navigate_next</div>
        <div id="bCardCount">
          <span id="bCardNow"></span> / <span id="bCardAll"></span>
        </div>
      </div>
    </div>
  </body>
</html>

## 2-flashcard.css
/* (A) MATERIAL ICONS */
.mi{font-family:"Material Icons";font-weight:400;font-style:normal;font-size:60px;line-height:1;letter-spacing:normal;text-transform:none;display:inline-block;white-space:nowrap;word-wrap:normal;direction:ltr;-webkit-font-feature-settings:"liga";-webkit-font-smoothing:antialiased}

/* (B) WHOLE PAGE & SHARED */
* {
  font-family: Arial, Helvetica, sans-serif;
  box-sizing: border-box;
}
body, #screenA, #screenB {
  padding: 0; margin: 0;
  width: 100vw; height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
}
body {
  background: rgb(79,85,171);
  background: linear-gradient(71deg, rgb(79,85,171) 0%, rgb(103,126,218) 77%, rgb(62,69,147) 100%);
}
.hide { display: none !important; }

/* (C) MAIN MENU */
#screenA { text-align: center; }
.mItem {
  width: 300px;
  border-radius: 10px;
  padding: 40px 0;
  margin-bottom: 10px;
  color: #fff;
  background: #363578;
  cursor: pointer;
}
.mItem:hover {
  color: #333;
  background: #f5ee03;
}
.mItem .mTxt { font-size: 24px; }

/* (D) VIEW CARDS */
/* (D1) CARD WARPPER */
#bCard {
  width: 80%; height: 60%;
  position: relative;
}

/* (D2) CARD BACK & FRONT */
.card { cursor: pointer; }
.card, .front, .back {
  width: 100%; height: 100%;
  position: absolute;
}
.front, .back {
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 20px;
  font-size: 60px;
  border-radius: 10px;
  backface-visibility: hidden;
}
.front, .mFront {
  color: #2e189a;
  background: #fff;
}
.back, .mBack {
  color: #fff;
  background: #2e189a;
}
.back { transform: rotateY(180deg); }
.mFront, .mBack {
  display: block;
  width: 100%; height: 50%;
  padding: 20px;
  resize: none;
  font-size: 20px;
}

/* (D3) CARD FILP */
.card {
  transition: transform 0.5s;
  transform-style: preserve-3d;
}
#bCard .card.flip { transform: rotateY(180deg); }

/* (E) CARD CONTROLS */
#bManage {
  padding: 10px;
  color: #fff;
  display: flex;
  align-items: center;
}
#bManage div.mi:hover {
  color: #f5ee03;
  cursor: pointer;
}
#bCardCount { font-size: 24px; }

## 2-flashcard.js
var cards = {
  // (A) PROPERTIES
  data : null, // flashcards data array
  cNow : null, // current flashcard
  cMode : null, // current mode - "v"iew or "m"anage
  hScr : null, // html screens
  hCard : null, // html card wrapper

  // (B) INIT APP
  init : () => {
    // (B1) RESTORE CARDS FROM LOCALSTORAGE
    cards.data = localStorage.getItem("cards");
    if (cards.data == null) { cards.data = []; }
    else { cards.data = JSON.parse(cards.data); }

    // (B2) GET HTML ELEMENTS
    cards.hScr = [
      document.getElementById("screenA"),
      document.getElementById("screenB")
    ];
    cards.hCard = document.getElementById("bCard");
  },

  // (C) SWTICH HTML SCREEN
  screen : i => { for (let j in cards.hScr) {
    if (i==j) { cards.hScr[j].classList.remove("hide"); }
    else { cards.hScr[j].classList.add("hide"); }
  }},

  // (D) UPDATE CURRENT & TOTAL CARDS
  count : () => {
    document.getElementById("bCardNow").innerHTML = cards.data.length==0 ? 0 : cards.cNow + 1;
    document.getElementById("bCardAll").innerHTML = cards.data.length;
  },

  // (E) VIEW/MANAGE CARDS
  view : mode => {
    // (E1) VIEW MODE - CONTINUE ONLY WHEN THERE ARE CARDS
    if (mode=="v" && cards.data.length==0) {
      alert("Add some cards first...");
      return;
    }

    // (E2) UPDATE FLAGS & CARDS COUNT
    cards.cMode = mode;
    cards.cNow = 0;
    cards.count();

    // (E3) SHOW/HIDE "MANAGE CARD" CONTROLS
    if (mode=="v") { for (let i of document.querySelectorAll(".bManage")) {
      i.classList.add("hide");
    }} else { for (let i of document.querySelectorAll(".bManage")) {
      i.classList.remove("hide");
    }}

    // (E4) DRAW CARD & SHOW
    cards.draw();
    cards.screen(1);
  },

  // (F) DRAW CARD
  draw : () => {
    // (F1) VIEW MODE CARD
    if (cards.cMode=="v") {
      cards.hCard.innerHTML = `<div class="card" onclick="this.classList.toggle('flip')">
      <div class="front">${cards.data[cards.cNow][0]}</div>
      <div class="back">${cards.data[cards.cNow][1]}</div>
      </div>`;
    }

    // (F2) MANAGE MODE CARD
    else {
      if (cards.data.length==0) {
        cards.hCard.innerHTML = `<div class="mFront">Add a card first.</div>`;
      } else {
        cards.hCard.innerHTML = `
        <textarea class="mFront" onchange="cards.update(this.value, 1)">${cards.data[cards.cNow][0]}</textarea>
        <textarea class="mBack" onchange="cards.update(this.value)">${cards.data[cards.cNow][1]}</textarea>`;
      }
    }
  },

  // (G) LAST/NEXT CARD
  move : next => {
    // (G1) UPDATE CURRENT CARD
    if (next) { cards.cNow++; }
    else { cards.cNow--; }
    if (cards.cNow >= cards.data.length) { cards.cNow = 0; }
    if (cards.cNow < 0) { cards.cNow = cards.data.length - 1; }

    // (G2) UPDATE HTML INTERFACE
    cards.count();
    cards.draw();
  },

  // (H) SAVE CARD DATA TO LOCALSTORAGE
  save : () => localStorage.setItem("cards", JSON.stringify(cards.data)),

  // (I) ADD EMPTY CARD
  add : () => {
    cards.data.splice(cards.cNow, 0, ["Front", "Back"]);
    cards.save();
    cards.count();
    cards.draw();
  },

  // (J) UPDATE CURRENT CARD
  update : (txt, side) => {
    if (side) { cards.data[cards.cNow][0] = txt; }
    else { cards.data[cards.cNow][1] = txt; }
    cards.save();
  },

  // (K) DELETE CURRENT CARD
  delete : () => { if (cards.data.length!=0) {
    cards.data.splice(cards.cNow, 1);
    cards.save();
    if (cards.data.length == 0) { cards.cNow = 0; }
    else if (cards.cNow+1 >= cards.data.length) {cards.cNow = cards.data.length-1; }
    cards.count();
    cards.draw();
  }}
};
window.onload = cards.init;

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

## 3-worker.js
// (A) CREATE/INSTALL CACHE
self.addEventListener("install", evt => {
  self.skipWaiting();
  evt.waitUntil(
    caches.open("JSFlashCard")
    .then(cache => cache.addAll([
      "1-flashcard.html",
      "2-flashcard.css",
      "2-flashcard.js",
      "favicon.png",
      "icon-512.png"
    ]))
    .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 Flashcards</title>
	<meta charset="utf-8">
	<meta name="description" content="Offline Javascript Flashcards">
	<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="Offline JS Flashcards">
	<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("3-worker.js");
	}
	</script>

	<!-- STYLESHEET + JAVASCRIPT -->
	<link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">
	<link rel="stylesheet" href="2-flashcard.css">
	<script src="2-flashcard.js"></script>
	</head>
	<body>
	<!-- (A) MAIN MENU -->
	<div id="screenA">
	<div class="mItem" onclick="cards.view('v')">
	<div class="mi">view_array</div>
	<div class="mTxt">View Cards</div>
	</div>
	<div class="mItem" onclick="cards.view('m')">
	<div class="mi">edit</div>
	<div class="mTxt">Manage Cards</div>
	</div>
	</div>

	<!-- (B) MANAGE/VIEW CARDS -->
	<div id="screenB" class="hide">
	<!-- (B1) CARDS WRAPPER -->
	<div id="bCard"></div>

	<!-- (B2) CONTROLS -->
	<div id="bManage">
	<div class="mi" onclick="cards.screen(0)">reply</div>
	<div class="mi bManage" onclick="cards.delete()">clear</div>
	<div class="mi bManage" onclick="cards.add()">add</div>
	<div class="mi" onclick="cards.move()">navigate_before</div>
	<div class="mi" onclick="cards.move(1)">navigate_next</div>
	<div id="bCardCount">
	<span id="bCardNow"></span> / <span id="bCardAll"></span>
	</div>
	</div>
	</div>
	</body>
	</html>
	/* (A) MATERIAL ICONS */
	.mi{font-family:"Material Icons";font-weight:400;font-style:normal;font-size:60px;line-height:1;letter-spacing:normal;text-transform:none;display:inline-block;white-space:nowrap;word-wrap:normal;direction:ltr;-webkit-font-feature-settings:"liga";-webkit-font-smoothing:antialiased}

	/* (B) WHOLE PAGE & SHARED */
	* {
	font-family: Arial, Helvetica, sans-serif;
	box-sizing: border-box;
	}
	body, #screenA, #screenB {
	padding: 0; margin: 0;
	width: 100vw; height: 100vh;
	display: flex;
	justify-content: center;
	align-items: center;
	flex-direction: column;
	}
	body {
	background: rgb(79,85,171);
	background: linear-gradient(71deg, rgb(79,85,171) 0%, rgb(103,126,218) 77%, rgb(62,69,147) 100%);
	}
	.hide { display: none !important; }

	/* (C) MAIN MENU */
	#screenA { text-align: center; }
	.mItem {
	width: 300px;
	border-radius: 10px;
	padding: 40px 0;
	margin-bottom: 10px;
	color: #fff;
	background: #363578;
	cursor: pointer;
	}
	.mItem:hover {
	color: #333;
	background: #f5ee03;
	}
	.mItem .mTxt { font-size: 24px; }

	/* (D) VIEW CARDS */
	/* (D1) CARD WARPPER */
	#bCard {
	width: 80%; height: 60%;
	position: relative;
	}

	/* (D2) CARD BACK & FRONT */
	.card { cursor: pointer; }
	.card, .front, .back {
	width: 100%; height: 100%;
	position: absolute;
	}
	.front, .back {
	display: flex;
	align-items: center;
	justify-content: center;
	text-align: center;
	padding: 20px;
	font-size: 60px;
	border-radius: 10px;
	backface-visibility: hidden;
	}
	.front, .mFront {
	color: #2e189a;
	background: #fff;
	}
	.back, .mBack {
	color: #fff;
	background: #2e189a;
	}
	.back { transform: rotateY(180deg); }
	.mFront, .mBack {
	display: block;
	width: 100%; height: 50%;
	padding: 20px;
	resize: none;
	font-size: 20px;
	}

	/* (D3) CARD FILP */
	.card {
	transition: transform 0.5s;
	transform-style: preserve-3d;
	}
	#bCard .card.flip { transform: rotateY(180deg); }

	/* (E) CARD CONTROLS */
	#bManage {
	padding: 10px;
	color: #fff;
	display: flex;
	align-items: center;
	}
	#bManage div.mi:hover {
	color: #f5ee03;
	cursor: pointer;
	}
	#bCardCount { font-size: 24px; }
	var cards = {
	// (A) PROPERTIES
	data : null, // flashcards data array
	cNow : null, // current flashcard
	cMode : null, // current mode - "v"iew or "m"anage
	hScr : null, // html screens
	hCard : null, // html card wrapper

	// (B) INIT APP
	init : () => {
	// (B1) RESTORE CARDS FROM LOCALSTORAGE
	cards.data = localStorage.getItem("cards");
	if (cards.data == null) { cards.data = []; }
	else { cards.data = JSON.parse(cards.data); }

	// (B2) GET HTML ELEMENTS
	cards.hScr = [
	document.getElementById("screenA"),
	document.getElementById("screenB")
	];
	cards.hCard = document.getElementById("bCard");
	},

	// (C) SWTICH HTML SCREEN
	screen : i => { for (let j in cards.hScr) {
	if (i==j) { cards.hScr[j].classList.remove("hide"); }
	else { cards.hScr[j].classList.add("hide"); }
	}},

	// (D) UPDATE CURRENT & TOTAL CARDS
	count : () => {
	document.getElementById("bCardNow").innerHTML = cards.data.length==0 ? 0 : cards.cNow + 1;
	document.getElementById("bCardAll").innerHTML = cards.data.length;
	},

	// (E) VIEW/MANAGE CARDS
	view : mode => {
	// (E1) VIEW MODE - CONTINUE ONLY WHEN THERE ARE CARDS
	if (mode=="v" && cards.data.length==0) {
	alert("Add some cards first...");
	return;
	}

	// (E2) UPDATE FLAGS & CARDS COUNT
	cards.cMode = mode;
	cards.cNow = 0;
	cards.count();

	// (E3) SHOW/HIDE "MANAGE CARD" CONTROLS
	if (mode=="v") { for (let i of document.querySelectorAll(".bManage")) {
	i.classList.add("hide");
	}} else { for (let i of document.querySelectorAll(".bManage")) {
	i.classList.remove("hide");
	}}

	// (E4) DRAW CARD & SHOW
	cards.draw();
	cards.screen(1);
	},

	// (F) DRAW CARD
	draw : () => {
	// (F1) VIEW MODE CARD
	if (cards.cMode=="v") {
	cards.hCard.innerHTML = `<div class="card" onclick="this.classList.toggle('flip')">
	<div class="front">${cards.data[cards.cNow][0]}</div>
	<div class="back">${cards.data[cards.cNow][1]}</div>
	</div>`;
	}

	// (F2) MANAGE MODE CARD
	else {
	if (cards.data.length==0) {
	cards.hCard.innerHTML = `<div class="mFront">Add a card first.</div>`;
	} else {
	cards.hCard.innerHTML = `
	<textarea class="mFront" onchange="cards.update(this.value, 1)">${cards.data[cards.cNow][0]}</textarea>
	<textarea class="mBack" onchange="cards.update(this.value)">${cards.data[cards.cNow][1]}</textarea>`;
	}
	}
	},

	// (G) LAST/NEXT CARD
	move : next => {
	// (G1) UPDATE CURRENT CARD
	if (next) { cards.cNow++; }
	else { cards.cNow--; }
	if (cards.cNow >= cards.data.length) { cards.cNow = 0; }
	if (cards.cNow < 0) { cards.cNow = cards.data.length - 1; }

	// (G2) UPDATE HTML INTERFACE
	cards.count();
	cards.draw();
	},

	// (H) SAVE CARD DATA TO LOCALSTORAGE
	save : () => localStorage.setItem("cards", JSON.stringify(cards.data)),

	// (I) ADD EMPTY CARD
	add : () => {
	cards.data.splice(cards.cNow, 0, ["Front", "Back"]);
	cards.save();
	cards.count();
	cards.draw();
	},

	// (J) UPDATE CURRENT CARD
	update : (txt, side) => {
	if (side) { cards.data[cards.cNow][0] = txt; }
	else { cards.data[cards.cNow][1] = txt; }
	cards.save();
	},

	// (K) DELETE CURRENT CARD
	delete : () => { if (cards.data.length!=0) {
	cards.data.splice(cards.cNow, 1);
	cards.save();
	if (cards.data.length == 0) { cards.cNow = 0; }
	else if (cards.cNow+1 >= cards.data.length) {cards.cNow = cards.data.length-1; }
	cards.count();
	cards.draw();
	}}
	};
	window.onload = cards.init;
	{
	"short_name": "Flashcards",
	"name": "JS Flashcards",
	"icons": [{
	"src": "favicon.png",
	"sizes": "64x64",
	"type": "image/png"
	}, {
	"src": "icon-512.png",
	"sizes": "512x512",
	"type": "image/png"
	}],
	"start_url": "1-flashcard.html",
	"scope": "/",
	"background_color": "white",
	"theme_color": "white",
	"display": "standalone"
	}
	// (A) CREATE/INSTALL CACHE
	self.addEventListener("install", evt => {
	self.skipWaiting();
	evt.waitUntil(
	caches.open("JSFlashCard")
	.then(cache => cache.addAll([
	"1-flashcard.html",
	"2-flashcard.css",
	"2-flashcard.js",
	"favicon.png",
	"icon-512.png"
	]))
	.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))
	));