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Javascript Slider Effect06

이미지 슬라이드 - 버튼 추가, 닷 버튼 추가

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<main>
    <section id="sliderType01">
        <div class="slider__wrap">
            <div class="slider__img">
                <div class="slider__inner">
                    <div class="slider"><img src="img/slider_img10.jpg" alt="이미지1"></div>
                    <div class="slider"><img src="img/slider_img09.jpg" alt="이미지2"></div>
                    <div class="slider"><img src="img/slider_img05.jpg" alt="이미지3"></div>
                    <div class="slider"><img src="img/slider_img03.jpg" alt="이미지4"></div>
                    <div class="slider"><img src="img/slider_img02.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"></div>
        </div>
    </section>
</main>

.slider__wrap {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
}
.slider__img {      /* 화면 보이는 구간 */
    width: 800px;
    height: 480px;
    overflow: hidden;
}
.slider__inner {        /* 이미지 움직이는 영역 */
    display: flex;
    width: 4000px;      /* 이미지 총 길이 */
    transform: translateX(0);
}
.slider {
    width: 800px;
    position: relative;
}
.slider::before {
    position: absolute;
    left: 5px; top: 5px;
    background: rgba(0,0,0,0.4);
    color: #fff;
    padding: 5px 10px 3px;
}
.slider:nth-child(1)::before {content: '이미지1';}
.slider:nth-child(2)::before {content: '이미지2';}
.slider:nth-child(3)::before {content: '이미지3';}
.slider:nth-child(4)::before {content: '이미지4';}
.slider:nth-child(5)::before {content: '이미지5';}

.slider__btn a {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    z-index: 100;
    width: 50px;
    height: 50px;
    background: rgba(0,0,0,0.4);
    text-align: center;
    line-height: 50px;
    transition: all 0.2s;
    display: block;
    color: #fff;
    text-decoration: none;
}
.slider__btn a.prev {
    left: 0;
}
.slider__btn a.next {
    right: 0;
}
.slider__btn a:hover {
    background: rgb(241, 96, 86);
}
.slider__dot {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    bottom: 20px;
}
.slider__dot .dot {
    width: 20px;
    height: 20px;
    background: rgba(0,0,0,0.4);
    display: inline-block;
    border-radius: 50%;
    transition: all 0.3s;
    margin: 3px;
}
.slider__dot .dot.active {
    background: rgba(255,255,255,0.9);
}

const sliderWrap = document.querySelector(".slider__wrap");
const sliderImg = document.querySelector(".slider__img");       //이미지 보이는 영역
const sliderInner = document.querySelector(".slider__inner");   //이미지 움직이는 영역
const slider = document.querySelectorAll(".slider");            //5개의 이미지 저장
const sliderBtn = document.querySelector(".slider__btn");
const sliderDot = document.querySelector(".slider__dot");

let currentIndex = 0;
let sliderCount = slider.length;
let sliderWidth = sliderImg.offsetWidth;
let dotIndex = "";
let dotActive;

function init(){
    for( i of slider){
        dotIndex += "<a href='#'' class='dot'></a>"
    }
    sliderDot.innerHTML = dotIndex;

    sliderDot.firstElementChild.classList.add("active");
}
init();

function gotoSlider(num){
    sliderInner.style.transition = "all 400ms";
    sliderInner.style.transform = "translateX("+ -sliderWidth * num + "px)";
    currentIndex = num;

    dotActive = sliderDot.querySelectorAll(".dot");
    dotActive.forEach(el => {
        el.classList.remove("active");
    })
    dotActive[num].classList.add("active");
}

sliderBtn.querySelectorAll("a").forEach((btn, index) => {
    btn.addEventListener("click", () => {
        let prevIndex = (currentIndex + (sliderCount - 1)) % sliderCount;
        let nextIndex = (currentIndex + 1) % sliderCount;

        if(btn.classList.contains("prev")){
            gotoSlider(prevIndex);
        } else {
            gotoSlider(nextIndex);
        };
    });
});

sliderDot.querySelectorAll("a").forEach((dot, index) => {
    dot.addEventListener("click", () => {
        gotoSlider(index);
    });
});