動きを実現する仕組み
JavascriptでMVなどで使用する複数表示版カルーセルスライダーを作成
STEP1 HTMLコード
<!DOCTYPE html>
<html lang="ja">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>test2</title>
<meta name="description" content="これはJsのTestページです" />
<meta name="keywords" content="test, サンプル, ウェブサイト" />
<!-- Google Fontsの読み込み -->
<link rel="preconnect" href="https://fonts.googleapis.com" />
<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin />
<link
href="https://fonts.googleapis.com/css2?family=Noto+Serif+JP:wght@ 200..900&display=swap"
rel="stylesheet"
/>
<!-- CSSファイルの読み込み -->
<link rel="stylesheet" href="css/normalize.css" />
<link rel="stylesheet" type="text/css" href="css/style.css" />
<link rel="stylesheet" type="text/css" href="css/header.css" />
<link rel="stylesheet" type="text/css" href="css/mv.css" />
<link rel="stylesheet" type="text/css" href="css/carousel.css" />
</head>
<body>
<header id="header">
<div class="header_inner">
<div class="header_logo">
<a href="index.html"><img src="images/logo2.svg" alt="ロゴ画像" /></a>
</div>
<nav class="header_nav">
<ul>
<li><a href="index.html">Home</a></li>
<li><a href="test1.html">Test1</a></li>
<li><a href="test2.html">Test2</a></li>
<li><a href="access.html">Access</a></li>
</ul>
<div class="header_btn">
<a href="#" class="btn_basic">お問い合わせ</a>
</div>
</nav>
</div>
</header>
<div class="mv_top_wrapper">
<div class="mv_top_inner">
<div class="mv_top_content">
<ul>
<li><img class="mv_image" src="images/mv1.jpg" alt="画像1" /></li>
<li><img class="mv_image" src="images/mv2.jpg" alt="画像2" /></li>
<li><img class="mv_image" src="images/mv3.jpg" alt="画像3" /></li>
</ul>
</div>
</div>
</div>
<main id="main">
<section class="carousel_section_secondary">
<div class="section_inner_secondary">
<h2 class="section_title_secondary">カルーセルの複数表示セクション</h2>
<div class="custom-carousel_secondary">
<div class="carousel-slides_secondary">
<div class="carousel-slide_secondary active">
<img src="/images/mv1.jpg" alt="画像1">
</div>
<div class="carousel-slide_secondary">
<img src="/images/mv2.jpg" alt="画像2"/>
</div>
<div class="carousel-slide_secondary">
<img src="/images/mv3.jpg" alt="画像3"/>
</div>
<div class="carousel-pagination_secondary"></div>
<button class="carousel-prev_secondary">❮</button>
<button class="carousel-next_secondary">❯</button>
</div>
</div>
</div>
</section>
</main>
<footer>
<div class="footer_inner"></div>
</footer>
<!-- JavaScriptファイルの読み込み -->
<script src="js/anime_mv.js"></script>
<script src="js/carousel.js"></script>
<script src="js/carousel_secondary.js"></script>
</body>
</html>CSSでコーディング
STEP2 cssコード
normalize.css
@charset "utf-8";
/*---------------サイトの基本設定---------------*/
/*html&bodyの設定*/
html {
font-size: 62.5%; /* 1rem = 10px */
overflow-y: scroll;
overflow-x: hidden;
}
body {
font-family: "YakuHanJPs_Noto", "Roboto", "Noto Sans JP", "游ゴシック Medium",
"游ゴシック体", "Yu Gothic Medium", "YuGothic", "ヒラギノ角ゴ ProN",
"Hiragino Kaku Gothic ProN", "メイリオ", "Meiryo", "ＭＳ Ｐゴシック",
"MS PGothic", sans-serif;
margin: 0;
padding: 0;
line-height: 1.8;
width: 100%;
height: 100%;
}
/* Box Sizing の設定 */
*,
*::before,
*::after {
box-sizing: border-box;
}
/* - - h1.h2.h3.... - - */
h1,
h2,
h3,
h4,
h5,
h6 {
font-weight: bold;
color: #000;
overflow-wrap: break-word;
}
/* -- a -- */
a {
text-decoration: none;
outline: none;
color: #000;
}
a,
a > img {
-webkit-transition: 0.2s;
-moz-transition: 0.2s;
-ms-transition: 0.2s;
-o-transition: 0.2s;
transition: 0.2s;
}
/* -- img -- */
img {
display: block;
max-width: 100%;
height: auto;
}
/* -- ul -- */
ul {
list-style: none;
}
li {
list-style: none;
}
/* -- :hover -- */
a:hover,
button:hover,
input[type="button"]:hover,
input[type="submit"]:hover,
input[type="reset"]:hover {
cursor: pointer;
}
/* -- inputの設定 --*/
input[type="text"] {
font-size: 1rem;
}
input[type="submit"] {
padding: 8px;
border: #efefef;
color: #000;
background-color: aliceblue;
}
/*-- フォーム要素の設定 --*/
button,
input,
select,
textarea {
font-family: inherit;
font-size: 100%;
margin: 0;
}
button {
border: none;
background: none;
padding: 0;
cursor: pointer;
}
/*--テーブルのborder-collapse*/
table {
border-collapse: collapse;
border-spacing: 0;
}
style.css
@charset "utf-8";
/*---------------rootの基本設定---------------*/
:root {
/* カラーパレット */
--primary-color: #3498db;
--secondary-color: #2ecc71;
--bg-beige: #f3f0e8;
--text-color: #333;
--white--: #ffffff;
--gold--: #b49f68;
--black--: #000000;
--footer-bg: #222222;
/* フォントサイズ */
--font-small: 12px; /* 12px */
--font-medium: 16px; /* 16px */
--font-large: 20px; /* 20px */
/* スペーシング */
--spacing-small: 8px;
--spacing-medium: 16px;
--spacing-large: 24px;
}
/*---------------設定終了---------------*/
/*---------------デバイス別表示・非表示---------------*/
/* PC専用（769px以上で表示） */
.pc-only {
display: block;
}
@media screen and (max-width: 768px) {
.pc-only {
display: none !important;
}
}
/* タブレット専用（768px〜1024px） */
.tablet-only {
display: none;
}
@media screen and (min-width: 768px) and (max-width: 1024px) {
.tablet-only {
display: block;
}
}
/* スマホ専用（500px以下で表示） */
.sp-only {
display: none;
}
@media screen and (max-width: 500px) {
.sp-only {
display: block !important;
}
}
/* モバイル専用（768px以下で表示：タブレット+スマホ） */
.mobile-only {
display: none;
}
@media screen and (max-width: 768px) {
.mobile-only {
display: block !important;
}
}
/*---------------デバイス別表示・非表示の設定終了---------------*/
/*---------------全体のフォント設定---------------*/
body {
font-family: "Noto Serif JP", "Helvetica Neue", Arial, sans-serif;
}
/*---------------全体のフォント設定終了---------------*/
header.css
@charset "utf-8";
/*---------------headerの設定-------------------------------*/
#header {
background-color: var(--white--);
box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
position: fixed;
top: 0;
width: 100%;
z-index: 999;
}
.header_inner {
width: 100%;
height: 70px;
margin-inline: auto;
padding-block: min(0.69vw, 10px);
padding-inline: min(1.39vw, 20px);
display: flex;
justify-content: space-between;
align-items: center;
}
.header_logo img {
width: 100%;
}
.header_nav {
display: flex;
align-items: center;
}
.header_nav ul {
list-style: none;
display: flex;
gap: min(1.39vw, 20px);
margin-right: min(1.39vw, 20px);
padding: 0;
}
.header_nav ul li a {
text-decoration: none;
color: var(--text-color);
font-size: min(1.11vw, 16px);
font-weight: 500;
}
.header_nav ul li a:hover {
color: var(--primary-color);
}
.header_btn .btn_basic {
background-color: var(--gold--);
color: var(--white--);
font-size: min(1.11vw, 16px);
padding-block: min(0.69vw, 10px);
padding-inline: min(1.39vw, 20px);
text-decoration: none;
border-radius: 5px;
font-weight: 600;
}
.header_btn .btn_basic:hover {
background-color: var(--black--);
}
/*---------------headerの設定終了-------------------------------*/
ここからがこの記事のメインのcssコード
@charset "utf-8";
/*---------------カルーセル２の設定-----------------------*/
/* PC時のみ3枚表示（中央だけ目立つ） */
.carousel_section_secondary {
width: 100%;
margin-block: 100px;
/* 必要に応じてmin-heightを調整 */
}
.section_inner_secondary {
width: 100%;
max-width: 1200px;
margin: 0 auto;
}
.section_title_secondary {
position: relative;
font-size: min(2.78vw, 40px);
font-weight: bold;
color: var(--text-color);
text-align: left;
margin-bottom: min(1.39vw, 20px);
padding-left: 15px;
}
.section_title_secondary::before {
content: "";
position: absolute;
top: 0;
left: 0;
width: 5px;
height: 100%;
background-color: var(--black--);
}
/* 基本レイアウト */
.custom-carousel_secondary {
position: relative;
left: 50%;
transform: translateX(-50%);
width: 100%;
max-width: 1200px; /* 親の幅を広げる */
margin: 0 auto;
padding: 0 0.5em;
overflow: visible;
}
/* スライド領域 */
.carousel-slides_secondary {
position: relative;
width: 100%;
aspect-ratio: 16 / 8;
display: flex;
justify-content: center;
align-items: center;
}
/* スライド基本 */
.carousel-slide_secondary {
position: absolute;
top: 50%;
left: 50%;
width: 400px;
aspect-ratio: 16 / 8;
transform: translate(-50%, -50%) scale(0.7);
opacity: 0;
z-index: 1;
transition: transform 0.5s cubic-bezier(0.77, 0, 0.175, 1),
opacity 0.5s cubic-bezier(0.77, 0, 0.175, 1);
pointer-events: none;
}
.carousel-slide_secondary.active {
transform: translate(-50%, -50%) scale(1);
opacity: 1;
z-index: 3;
width: 800px;
aspect-ratio: 5 / 3;
pointer-events: auto;
}
.carousel-slide_secondary img {
width: 100%;
height: 100%;
object-fit: cover;
position: relative;
border-radius: 8px;
box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
z-index: 0;
}
/* active, prev, next以外は非表示 */
.carousel-slide_secondary:not(.active):not(.prev):not(.next) {
opacity: 0;
pointer-events: none;
z-index: 1;
}
.carousel-slide_secondary.prev {
transform: translate(-180%, -50%) scale(0.85); /*通常は-150%*/
opacity: 0.7;
z-index: 2;
pointer-events: auto;
width: 300px;
aspect-ratio: 5 / 3;
}
.carousel-slide_secondary.next {
transform: translate(80%, -50%) scale(0.85); /*通常は50%*/
opacity: 0.7;
z-index: 2;
pointer-events: auto;
width: 300px;
aspect-ratio: 5 / 3;
}
/* ボタン */
.carousel-prev_secondary,
.carousel-next_secondary {
position: absolute;
top: 50%;
transform: translateY(-50%);
background: rgba(0, 0, 0, 0.3);
color: #fff;
border: none;
font-size: 2em;
padding: 0.2em 0.6em;
cursor: pointer;
z-index: 3;
}
.carousel-prev_secondary {
left: 10px;
}
.carousel-next_secondary {
right: 10px;
}
/* ページネーション */
.carousel-pagination_secondary {
position: absolute;
left: 50%;
bottom: 15px;
transform: translateX(-50%);
display: flex;
gap: 8px;
z-index: 3;
}
.carousel-dot_secondary {
width: 12px;
height: 12px;
border-radius: 50%;
background: #fff;
opacity: 0.5;
cursor: pointer;
border: 1px solid #888;
transition: opacity 0.3s;
}
.carousel-dot_secondary.active {
opacity: 1;
background: #333;
}
/* レスポンシブ max-width */
@media screen and (max-width: 1300px) {
.section_inner_secondary {
width: 100%;
max-width: 900px;
margin: 0 auto;
}
.carousel-slide_secondary.active {
width: 600px;
}
.carousel-slide_secondary.prev {
transform: translate(-190%, -50%) scale(0.85); /*通常は-150%*/
width: 200px;
aspect-ratio: 5 / 3;
}
.carousel-slide_secondary.next {
transform: translate(90%, -50%) scale(0.85); /*通常は50%*/
width: 200px;
aspect-ratio: 5 / 3;
}
}
/* iPadサイズ（600px～899px）で2枚表示 */
@media (min-width: 600px) and (max-width: 1022px) {
.carousel-slides_secondary {
position: relative;
aspect-ratio: 16 / 8;
}
.carousel-slide_secondary {
position: absolute;
top: 50%;
left: 50%;
width: 320px;
aspect-ratio: 16 / 11;
opacity: 0;
z-index: 1;
pointer-events: none;
transition: transform 0.7s cubic-bezier(0.77, 0, 0.175, 1),
opacity 0.7s cubic-bezier(0.77, 0, 0.175, 1);
}
.carousel-slide_secondary.active {
width: 320px;
transform: translate(-100%, -50%) scale(1);
opacity: 1;
z-index: 3;
pointer-events: auto;
}
.carousel-slide_secondary.next {
width: 320px;
transform: translate(0%, -50%) scale(1);
opacity: 1;
z-index: 2;
pointer-events: auto;
}
.carousel-slide_secondary.prev,
.carousel-slide_secondary:not(.active):not(.next) {
opacity: 0;
pointer-events: none;
z-index: 1;
display: none;
}
.carousel-slide_secondary img {
width: 100%;
height: 100%;
border-radius: 8px;
box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
}
}
@media screen and (max-width: 768px) {
.carousel_section_secondary {
margin-block: 50px;
/* 必要に応じてmin-heightを調整 */
}
.section_inner_secondary {
width: 100%;
margin: 0 auto;
padding-inline: 10px;
}
.custom-carousel_secondary {
margin-top: 20px;
}
.carousel-dot_secondary {
width: 15px;
height: 15px;
}
}
/* スマホは1枚だけ表示 */
@media (max-width: 600px) {
.carousel-slide_secondary {
position: absolute;
top: 0;
left: 0;
width: 100%;
aspect-ratio: 16 / 8;
opacity: 0;
z-index: 1;
pointer-events: none;
display: none;
transition: opacity 0.6s;
}
.carousel-slide_secondary.active {
transform: none;
opacity: 1;
z-index: 2;
width: 100%;
aspect-ratio: 16 / 8;
pointer-events: auto;
display: block;
}
.carousel-slide_secondary.prev,
.carousel-slide_secondary.next,
.carousel-slide_secondary:not(.active) {
opacity: 0;
pointer-events: none;
z-index: 1;
display: none;
}
.carousel-prev_secondary,
.carousel-next_secondary {
top: 50%;
transform: translateY(-50%);
}
}
@media (max-width: 500px) {
.carousel-prev_secondary,
.carousel-next_secondary {
font-size: 1.2em;
padding: 0.3em 0.4em;
}
}
JSを使ってJSコード作成
STEP3 JSコード
document.addEventListener("DOMContentLoaded", function () {
const slides = document.querySelectorAll(".carousel-slide_secondary");
const prevBtn = document.querySelector(".carousel-prev_secondary");
const nextBtn = document.querySelector(".carousel-next_secondary");
const pagination = document.querySelector(".carousel-pagination_secondary");
let current = 0;
let timer;
// ページネーション生成
if (pagination) {
slides.forEach((_, i) => {
const dot = document.createElement("span");
dot.className = "carousel-dot_secondary" + (i === 0 ? " active" : "");
dot.addEventListener("click", function () {
current = i;
showSlide(current);
stopAuto();
startAuto();
});
pagination.appendChild(dot);
});
}
function updatePagination(idx) {
const dots = document.querySelectorAll(".carousel-dot_secondary");
dots.forEach((dot, i) => {
dot.classList.toggle("active", i === idx);
});
}
function showSlide(idx) {
slides.forEach((slide, i) => {
slide.classList.remove("active", "prev", "next");
if (i === idx) {
slide.classList.add("active");
} else if (i === (idx - 1 + slides.length) % slides.length) {
slide.classList.add("prev");
} else if (i === (idx + 1) % slides.length) {
slide.classList.add("next");
}
});
updatePagination(idx);
}
function nextSlide() {
current = (current + 1) % slides.length;
showSlide(current);
}
function prevSlide() {
current = (current - 1 + slides.length) % slides.length;
showSlide(current);
}
function startAuto() {
timer = setInterval(nextSlide, 4000);
}
function stopAuto() {
clearInterval(timer);
}
if (prevBtn && nextBtn) {
prevBtn.addEventListener("click", function () {
prevSlide();
stopAuto();
startAuto();
});
nextBtn.addEventListener("click", function () {
nextSlide();
stopAuto();
startAuto();
});
}
// 画像にマウス・タッチで自動再生停止
slides.forEach((slide) => {
slide.addEventListener("mouseenter", stopAuto);
slide.addEventListener("mouseleave", startAuto);
slide.addEventListener("touchstart", stopAuto, { passive: true });
slide.addEventListener("touchend", startAuto, { passive: true });
});
// スワイプで次/前
let startX = null;
slides.forEach((slide) => {
slide.addEventListener(
"touchstart",
function (e) {
startX = e.touches[0].clientX;
},
{ passive: true }
);
slide.addEventListener(
"touchend",
function (e) {
if (startX === null) return;
let endX = e.changedTouches[0].clientX;
if (endX - startX > 50) {
prevSlide();
stopAuto();
startAuto();
} else if (startX - endX > 50) {
nextSlide();
stopAuto();
startAuto();
}
startX = null;
},
{ passive: true }
);
});
showSlide(current);
startAuto();
});
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