[Udemy]20 Web Projects With Vanilla JavaScript -Project#14

유데미에서 Brad Traversy의 20 Web Projects With Vanilla JavaScript

를 하나씩 직접 코딩해보면서 정리하기 위한 글이다.

데모 페이지

vanillawebprojects.com/projects/memory-cards/

코드 링크

index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <link
            rel="stylesheet"
            href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.11.2/css/all.min.css"
            integrity="sha256-+N4/V/SbAFiW1MPBCXnfnP9QSN3+Keu+NlB+0ev/YKQ="
            crossorigin="anonymous"
    />
    <link rel="stylesheet" href="style.css" />
    <title>메모리 카드</title>
</head>
<body>
    <button id="clear" class="clear btn">
        <i class="fas fa-trash"></i> Clear Cards
    </button>

    <h1>
        Memory Cards
        <button id="show" class="btn btn-small">
            <i class="fas fa-plus"></i> Add New Card
        </button>
    </h1>

    <div id="cards-container" class="cards">
    </div>

    <div class="navigation">
        <button id="prev" class="nav-button">
            <i class="fas fa-arrow-left"></i>
        </button>

        <p id="current"></p>

        <button id="next" class="nav-button">
            <i class="fas fa-arrow-right"></i>
        </button>
    </div>

    <div id="add-container" class="add-container">
        <h1>
            Add New Card
            <button id="hide" class="btn btn-small btn-ghost">
                <i class="fas fa-times"></i>
            </button>
        </h1>

        <div class="form-group">
            <label for="question">Question</label>
            <textarea id="question" placeholder="Enter question..."></textarea>
        </div>

        <div class="form-group">
            <label for="answer">Answer</label>
            <textarea id="answer" placeholder="Enter Answer..."></textarea>
        </div>

        <button id="add-card" class="btn">
            <i class="fas fa-plus"></i> Add Card
        </button>
    </div>

    <script src="script.js"></script>
</body>
</html>

style.css

@import url('https://fonts.googleapis.com/css?family=Lato:300,500,700&display=swap');

* {
    box-sizing: border-box;
}

body {
    background-color: #fff;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100vh;
    margin: 0;
    overflow: hidden;
    font-family: 'Lato', sans-serif;
}

h1 {
    position: relative;
}

h1 button {
    position: absolute;
    right: 0;
    transform: translate(120%, -50%);
    z-index: 2;
}

.btn {
    cursor: pointer;
    background-color: #fff;
    border: 1px solid #aaa;
    border-radius: 3px;
    font-size: 14px;
    margin-top: 20px;
    padding: 10px 15px;
}

.btn-small {
    font-size: 12px;
    padding: 5px 10px;
}

.btn-ghost {
    border: 0;
    background-color: transparent;
}

.clear {
    position: absolute;
    bottom: 30px;
    left: 30px;
}

.cards {
    perspective: 1000px;
    position: relative;
    height: 300px;
    width: 500px;
    max-width: 100%;
}

.card {
    position: absolute;
    opacity: 0;
    font-size: 1.5em;
    top: 0;
    left: 0;
    height: 100%;
    width: 100%;
    transform: translateX(50%) rotateY(-10deg);
    transition: transform 0.4s ease, opacity 0.4s ease;
}

.card.active {
    cursor: pointer;
    opacity: 1;
    z-index: 10;
    transform: translateX(0) rotateY(0deg);
}

.card.left {
    transform: translateX(-50%) rotateY(10deg);
}

.inner-card {
    box-shadow: 0 1px 10px rgba(0, 0, 0, 0.3);
    border-radius: 4px;
    height: 100%;
    width: 100%;
    position: relative;
    transform-style: preserve-3d;
    transition: transform 0.4s ease;
}

.card.show-answer .inner-card {
    transform: rotateX(180deg);
}

.inner-card-front,
.inner-card-back {
    backface-visibility: hidden;
    position: absolute;
    top: 0;
    left: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    width: 100%;
    background: #fff;
}

.inner-card-front {
    transform: rotateX(0deg);
    z-index: 2;
}

.inner-card-back {
    transform: rotateX(180deg);
}

.inner-card-front::after,
.inner-card-back::after {
    content: '\f021  Flip';
    font-family: 'Font Awesome 5 Free', Lato, sans-serif;
    position: absolute;
    top: 10px;
    right: 10px;
    font-weight: bold;
    font-size: 16px;
    color: #ddd;
}

.navigation {
    display: flex;
    margin: 20px 0;
}

.navigation .nav-button {
    border: none;
    background-color: transparent;
    cursor: pointer;
    font-size: 16px;
}

.navigation p {
    margin: 0 25px;
}

.add-container {
    opacity: 0;
    z-index: -1;
    background-color: #f0f0f0;
    border-top: 2px solid #eee;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 10px 0;
    position: absolute;
    top: 0;
    bottom: 0;
    width: 100%;
    transition: 0.3s ease;
}

.add-container.show {
    opacity: 1;
    z-index: 2;
}

.add-container h3 {
    margin: 10px 0;
}

.form-group label {
    display: block;
    margin: 20px 0 10px;
}

.form-group textarea {
    border: 1px solid #aaa;
    border-radius: 3px;
    font-size: 16px;
    padding: 12px;
    min-width: 500px;
    max-width: 100%;
}

script.js

const cardsContainer = document.getElementById('cards-container');
const prevBtn = document.getElementById('prev');
const nextBtn = document.getElementById('next');
const currentEl = document.getElementById('current');
const showBtn = document.getElementById('show');
const hideBtn = document.getElementById('hide');
const questionEl = document.getElementById('question');
const answerEl = document.getElementById('answer');
const addCardBtn = document.getElementById('add-card');
const clearBtn = document.getElementById('clear');
const addContainer = document.getElementById('add-container');

let currentActiveCard = 0;

const cardsEl = [];

const cardsData = getCardsData();

function createCards() {
    cardsData.forEach((data, index) => createCard(data, index));
}

function createCard(data, index) {
    const card = document.createElement('div');
    card.classList.add('card');

    if (index === 0) {
        card.classList.add('active');
    }

    card.innerHTML = `
  <div class="inner-card">
  <div class="inner-card-front">
    <p>
      ${data.question}
    </p>
  </div>
  <div class="inner-card-back">
    <p>
      ${data.answer}
    </p>
  </div>
</div>
  `;

    card.addEventListener('click', () => card.classList.toggle('show-answer'));

    cardsEl.push(card);

    cardsContainer.appendChild(card);

    updateCurrentText();
}

function updateCurrentText() {
    currentEl.innerText = `${currentActiveCard + 1}/${cardsEl.length}`;
}

function getCardsData() {
    const cards = JSON.parse(localStorage.getItem('cards'));
    return cards === null ? [] : cards;
}

function setCardsData(cards) {
    localStorage.setItem('cards', JSON.stringify(cards));
    window.location.reload();
}

createCards();

nextBtn.addEventListener('click', () => {
    cardsEl[currentActiveCard].className = 'card left';

    currentActiveCard = currentActiveCard + 1;

    if (currentActiveCard > cardsEl.length - 1) {
        currentActiveCard = cardsEl.length - 1;
    }

    cardsEl[currentActiveCard].className = 'card active';

    updateCurrentText();
});

prevBtn.addEventListener('click', () => {
    cardsEl[currentActiveCard].className = 'card right';

    currentActiveCard = currentActiveCard - 1;

    if (currentActiveCard < 0) {
        currentActiveCard = 0;
    }

    cardsEl[currentActiveCard].className = 'card active';

    updateCurrentText();
});

showBtn.addEventListener('click', () => addContainer.classList.add('show'));

hideBtn.addEventListener('click', () => addContainer.classList.remove('show'));

addCardBtn.addEventListener('click', () => {
    const question = questionEl.value;
    const answer = answerEl.value;

    if (question.trim() && answer.trim()) {
        const newCard = { question, answer };

        createCard(newCard);

        questionEl.value = '';
        answerEl.value = '';

        addContainer.classList.remove('show');

        cardsData.push(newCard);
        setCardsData(cardsData);
    }
});

clearBtn.addEventListener('click', () => {
    localStorage.clear();
    cardsContainer.innerHTML = '';
    window.location.reload();
});

강의를 통해 배운 점(생각, 내용 정리)

location.reload() => 새로고침 기능
localSotrage.clear()등 로컬 저장으로 웹 상 데이터 저장 기능에 대한 학습을 할 수 있었다.

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