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Slider Effect06 - javascript

이미지 슬라이드 - 닷메뉴 추가

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<main>
    <div class="slider-wrap">
        <div class="slider-img">
            <div class="slider-inner">
                <div class="slider" data-name="이미지1">
                    <img src="../assets/img/bg32.jpg" alt="이미지1">
                </div>
                <div class="slider" data-name="이미지2">
                    <img src="../assets/img/bg39.jpg" alt="이미지2">
                </div>
                <div class="slider" data-name="이미지3">
                    <img src="../assets/img/bg37.jpg" alt="이미지3">
                </div>
                <div class="slider" data-name="이미지4">
                    <img src="../assets/img/bg36.jpg" alt="이미지4">
                </div>
                <div class="slider" data-name="이미지5">
                    <img src="../assets/img/bg35.jpg" alt="이미지5">
                </div>
            </div>
        </div>
        <div class="slider-btn">
            <a href="#" class="prev">prev</a>
            <a href="#" class="next">next</a>
        </div>
        <div class="slider-dot">
            <!-- <a href="#" class="dot active">1</a>
            <a href="#" class="dot">2</a>
            <a href="#" class="dot">3</a>
            <a href="#" class="dot">4</a>
            <a href="#" class="dot">5</a> -->
        </div>
    </div>
</main>

/* slider */
.slider-wrap {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}
.slider-img {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    width: 800px;
    height: 480px;
    overflow: hidden;
}
.slider-img img {
    width: 100%;
}
.slider-inner {
    position: relative;
    /* width: 4000px; */
    height: 480px;
    overflow: hidden;
}
.slider-inner .slider {
    float: left;
    width: 800px;
    height: 480px;
    position: relative;
}
.slider-inner .slider::before {
    position: absolute;
    left: 5px;
    top: 5px;
    background: rgba(0,0,0,.4);
    color: #fff;
    padding: 5px 10px 3px;
    font-family: 'NEXONLv1Gothic';
}
.slider-inner .slider:nth-child(1) {
    z-index: 5;
}
.slider-inner .slider:nth-child(2) {
    z-index: 4;
}
.slider-inner .slider:nth-child(3) {
    z-index: 3;
}
.slider-inner .slider:nth-child(4) {
    z-index: 2;
}
.slider-inner .slider:nth-child(5) {
    z-index: 1;
}
.slider-inner .slider::before {
    content: attr(data-name);
}

.slider-btn a {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    z-index: 1000;
    width: 50px;
    height: 50px;
    background: rgba(0,0,0,.4);
    text-align: center;
    line-height: 50px;
    transition: all 0.2s;
    display: block;
    color: #fff;
    text-decoration: none;
}
.slider-btn a:hover {
    background: rgba(241, 96, 86, 1);
}
.slider-btn .prev {
    left: 0;
}
.slider-btn .next {
    right: 0;
}

.slider-dot {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    bottom: 20px;
}
.slider-dot .dot {
    width: 20px;
    height: 20px;
    background: rgba(0,0,0,.4);
    display: inline-block;
    border-radius: 50%;
    transition: all .3s;
    text-indent: -9999px;
    margin: 3px;
}
.slider-dot .dot.active {
    background: rgba(255,255,255,.9);
}

const sliderWrap = document.querySelector(".slider-wrap");
const sliderImg = sliderWrap.querySelector(".slider-img");
const sliderInner = sliderImg.querySelector(".slider-inner");
const slider = sliderInner.querySelectorAll(".slider");
const sliderBtn = sliderWrap.querySelector(".slider-btn");
const sliderBtnPrev = sliderBtn.querySelector(".prev");
const sliderBtnNext = sliderBtn.querySelector(".next");
const sliderDot = sliderWrap.querySelector(".slider-dot");

let sliderCount = slider.length;
let sliderWidth = document.querySelector(".slider").offsetWidth;
let sliderTotalWidth = sliderWidth * sliderCount;
let currentIndex = 0;
let dotIndex = "";

// 즉시 실행 함수
(() => {
    // 기본 셋팅
    sliderInner.style.width = sliderTotalWidth + "px";
    sliderInner.style.transition = "all 300ms ease-in";
    sliderInner.style.left = 0;

    // 닷 메뉴 셋팅
    slider.forEach((e, i) => {
        let active = "";
        if(i === currentIndex) active = "active";
        dotIndex += `<a href='#' class='dot ${active}'>${i}</a>`;
    })
    sliderDot.innerHTML = dotIndex;
})()

// 이미지 움직이기
const gotoSlider = num => {
    sliderInner.style.left = -sliderWidth * num + "px";
    currentIndex = num;
    dotActive()
}

// 왼쪽 버튼
const btnPrev = (e) => {
    e.preventDefault();
    let prevIndex = (currentIndex - 1) % sliderCount;
    if(currentIndex == 0) prevIndex = sliderCount - 1;
    
    gotoSlider(prevIndex);
}

// 오른쪽 버튼
const btnNext = (e) => {
    e.preventDefault();
    let NextIndex = (currentIndex + 1) % sliderCount;

    gotoSlider(NextIndex);
}

// 닷 메뉴 활성화
// function dotActive(){
//     sliderDot.querySelectorAll("a").forEach((el, i) => {
//         if(el.classList.contains("active")){
//             el.classList.remove("active");
//         }
//     });
//     sliderDot.querySelectorAll("a")[currentIndex].classList.add("active");
// }

// 닷 메뉴 활성화 - 간단
function dotActive(){
    sliderDot.querySelectorAll("a").forEach((el,index)=>{
        index == currentIndex ? el.classList.add('active') : el.classList.remove('active');
    });
}

// 닷 메뉴 버튼
sliderDot.querySelectorAll("a").forEach((dot, index) => {
    dot.addEventListener("click", (e) => {
        e.preventDefault();
        gotoSlider(index);
        dotActive();
    });
});

sliderBtnPrev.addEventListener("click", btnPrev);
sliderBtnNext.addEventListener("click", btnNext);

// 소스보기 실행함수
modal();