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Beispiel:Memo-Card-3.html

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<!DOCTYPE html>
<html lang="de">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <link rel="stylesheet" media="screen" href="./Beispiel:SELFHTML-Beispiel-Grundlayout.css">
  <title>Memo-Quiz - fertig!</title>
  <style>

#gameboard {
  display: grid;
  gap: 1em;
	grid-template-columns: repeat(4, 1fr);
	width: 32em;
}

#gameboard button {
  width: 8em;
  aspect-ratio: 1 / 1;
  perspective: 500px;
  background: transparent;
  border: 0;
  padding: 0;
}

img {
  max-width: 100%;
  display: block; 
}

.flip-card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  text-align: center;
  transition: transform 0.6s;
  transform-style: preserve-3d;
}

ul {
  text-align: start;
}

.flip-card[aria-selected="true"] .flip-card-inner {
  transform: rotateY(180deg);
}

.flip-card-front,
.flip-card-back {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: thin solid black;
  backface-visibility: hidden;
}

.flip-card-front {
  background-color: #e6f2f7;
  transform: rotateY(180deg);
}

.flip-card-front img {
  width: 100%;
  height: auto;
  background-color: #fff;
  display: block;
}

.flip-card-back {
  background: white url(https://wiki.selfhtml.org/images/4/45/SELF-Logo.svg);
  background-size: contain; 
  background-repeat: no-repeat;
  background-position: center; 
}

.error,
.success {
	padding: 1rem 2rem;
}

.error {
	background: #ffdddd;
	color: red;
}

.success {
	background: #ddffdd;
	color: green;
	white-space: pre-wrap;
}

</style>
	  

</head>
 
<body>
  <h1>Memo-Quiz</h1>
  
  <p id="hint">Wähle zwei Karten aus und prüfe, ob sie ein Set sind.</p> 
  
  <div id="gameboard">
  	<img src="https://wiki.selfhtml.org/images/f/fd/Snowman.svg" alt="snowman">
  	<img src="https://wiki.selfhtml.org/images/9/90/Advent-candles-4.svg" alt="candles">  
    <img src="https://wiki.selfhtml.org/images/0/01/Selfhtml-logo-Weihnachten.png" alt="SELF-Logo mit Nikloausmütze, ca 2008">
    <img src="https://wiki.selfhtml.org/images/5/59/Selfangel.jpg" alt="SELF-Mitglied als Weihnachtsengel, ca 2008">    
    <img src="https://wiki.selfhtml.org/images/4/47/Elf.svg" alt="ELF">  
    <img src="https://wiki.selfhtml.org/images/6/66/SELF-Logo-Nikolaus.svg" alt="logo">
  </div>    
 
<p>Zum Tutorial: <a href="https://wiki.selfhtml.org/wiki/JavaScript/Tutorials/Spiele/Memo-Quiz">Memo-Quiz</a>.</p>

<a href="https://forum.selfhtml.org/advent/2024"><div style="display:grid;grid-template-columns: 63px 1fr; gap:0.5em;"><img src="https://wiki.selfhtml.org/images/a/ad/Selfhtml-nico.png" alt="SELFHTML-Logo mit Adventsmütze" width="63px"><p>Zurück zum <br><b>Adventskalender 2024</b>.</p></div></a> 
  

<script>
document.addEventListener("DOMContentLoaded", () => {
  const gameboard = document.querySelector("#gameboard");
  const hint = document.querySelector("#hint");

  let selectedCards = [];
  let totalPairs;
  let matchedPairs = 0;

  function alert(text, type) {
    if (text) {
      setTimeout(() => {
        hint.textContent = text;
        hint.className = type ? type : "error";
      }, 50);
    } else {
      hint.textContent = "";
      hint.className = "";
    }
  }

  function shuffle(array) {
    for (let i = array.length - 1; i > 0; i--) {
      const j = Math.floor(Math.random() * (i + 1));
      [array[i], array[j]] = [array[j], array[i]];
    }
  }


  function initializeGame() {
    const images = Array.from(gameboard.querySelectorAll("img"));
    const cards = [];


    images.forEach((img) => {
      cards.push({ src: img.src, alt: img.alt });
      cards.push({ src: img.src, alt: img.alt });
    });

    shuffle(cards);

    gameboard.innerHTML = "";
    matchedPairs = 0;
    totalPairs = cards.length / 2;

    cards.forEach(({ src, alt }) => {
      const button = createCard(src, alt);
      gameboard.appendChild(button);
    });
  }

  function createCard(src, alt) {
    const button = document.createElement("button");
    button.classList.add("flip-card");
    button.setAttribute("aria-selected", "false");

    const flipCardInner = document.createElement("div");
    flipCardInner.classList.add("flip-card-inner");

    const flipCardFront = document.createElement("img");
    flipCardFront.classList.add("flip-card-front");
    flipCardFront.src = src;
    flipCardFront.alt = alt;

    const flipCardBack = document.createElement("div");
    flipCardBack.classList.add("flip-card-back");

    flipCardInner.appendChild(flipCardFront);
    flipCardInner.appendChild(flipCardBack);
    button.appendChild(flipCardInner);

    button.addEventListener("click", () => {
      handleCardClick(button, src);
    });

    return button;
  }

  function handleCardClick(card, src) {
    if (selectedCards.length >= 2 || card.getAttribute("aria-selected") === "true") {
      return; 
    }

    card.setAttribute("aria-selected", "true");
    selectedCards.push({ card, src });

    if (selectedCards.length === 2) {
      const [firstCard, secondCard] = selectedCards;

      if (firstCard.src === secondCard.src) {
        matchedPairs++;
        selectedCards = [];
        if (matchedPairs === totalPairs) {
          alert("Herzlichen Glückwunsch!", "success");
        }
      } else {

        setTimeout(() => {
          firstCard.card.setAttribute("aria-selected", "false");
          secondCard.card.setAttribute("aria-selected", "false");
          selectedCards = [];
        }, 1000);
      }
    }
  }

  initializeGame();
});
</script>
</body>
</html>
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