javascript/slider.html at main · imdongyoung/javascript · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        body{
            margin: 0;
        }
        .slider{
            width: 100%;
            position: relative;
        }
        .slider_item {
            width: 100%;
            height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            color: #fff;
            position: absolute;
            top: 0;
            z-index: 0;
            opacity: 0;
            transition: all .5s ease-in-out;
            transform: scale(0.9);
        }
        .slider_item:nth-child(odd){
            background-color: #8e44ad;
        }
        .slider_item:nth-child(even){
            background-color: #3498db;
        }
        .showing {
            opacity: 1;
            z-index: 1;
            transform: none;
        }
        .arrow {
            height: 100vh;
            margin: 0 auto;
            width: 70%;
            z-index: 99;
            position: relative;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 3rem;
            color: #fff;
            cursor: pointer;
        }
        .arrow>span:hover{
            color: #5ac0e9;
        }
    </style>
</head>
<body>
    <div id="slider">
        <div class="slider_item showing"><h1>1</h1></div>
        <div class="slider_item"><h1>2</h1></div>
        <div class="slider_item"><h1>3</h1></div>
        <div class="slider_item"><h1>4</h1></div>
        <div class="slider_item"><h1>5</h1></div>
    </div>
    <div class="arrow">
        <span><</span>
        <span>></span>
    </div>
    <script>
        const SHOWING_CLASS = "showing";
        const firstSlider = document.querySelector(".slider_item:first-child");
        const lastSlider = document.querySelector(".slider_item:last-child");

        const rightArrow = document.querySelector(".arrow span:last-child");
        const leftArrow = document.querySelector(".arrow span:first-child");

        function rightArrowClick() {
            const currentSlide = document.querySelector(`.${SHOWING_CLASS}`);
            currentSlide.classList.remove(SHOWING_CLASS);
            const nextSlide = currentSlide.nextElementSibling;
            if(nextSlide){
                nextSlide.classList.add(SHOWING_CLASS);
            } else {
                firstSlider.classList.add(SHOWING_CLASS);
            }
        }

        function leftArrowClick() {
            const currentSlide = document.querySelector(`.${SHOWING_CLASS}`);
            currentSlide.classList.remove(SHOWING_CLASS);
            const previousSlide = currentSlide.previousElementSibling;
            if(previousSlide){
                previousSlide.classList.add(SHOWING_CLASS);
            } else {
                lastSlider.classList.add(SHOWING_CLASS);
            }
        }

        function slide() {
            const currentSlide = document.querySelector(`.${SHOWING_CLASS}`);
            if (currentSlide) {
                currentSlide.classList.remove(SHOWING_CLASS);
                const nextSlide = currentSlide.nextElementSibling;
                if(nextSlide){
                    nextSlide.classList.add(SHOWING_CLASS);
                } else {
                    firstSlider.classList.add(SHOWING_CLASS);
                }
            } else {
                firstSlider.classList.add(SHOWING_CLASS);
            }
        }

        setInterval(slide, 5000);

        rightArrow.addEventListener("click", rightArrowClick);
        leftArrow.addEventListener("click", leftArrowClick);

    </script>
</body>
</html>