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JavaScript Slider Effect05

이미지 슬라이드 - 버튼 추가

//slider05
    <section id="slideType05">
        <div class="slider__wrap">
            <div class="slider__img">
                <div class="slider__inner">
                    <div class="slider"><img src="img/slide06.jpg" alt="이미지1"></div>
                    <div class="slider"><img src="img/slide07.jpg" alt="이미지2"></div>
                    <div class="slider"><img src="img/slide08.jpg" alt="이미지3"></div>
                    <div class="slider"><img src="img/slide09.jpg" alt="이미지4"></div>
                    <div class="slider"><img src="img/slide10.jpg" alt="이미지5"></div>
                </div>
            </div>
            <div class="slider__btn">
                <a href="#" class="prev">prev</a>
                <a href="#" class="next">next</a>
            </div>
        </div>
    </section>

/* slider */
    .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: 4800px;          /* 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: 3px 10px 5px;
    }
    .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);
    }

//slider05
    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 sliderBtnPrev = sliderBtn.querySelector(".prev");          //이전 버튼 선택
    const sliderBtnNext = sliderBtn.querySelector(".next");          //다음 버튼 선택
    
    let currentIndex = 0;
    let sliderCount = slider.length;
    let sliderWidth = sliderImg.offsetWidth;

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

    sliderBtnPrev.addEventListener("click", () => {                         //이전 버튼을 눌렀을 때
        let prevIndex = (currentIndex + (sliderCount - 1)) % sliderCount;   //현재의 값이 - 1 씩 감소
        gotoSlider(prevIndex)
    })    

    sliderBtnNext.addEventListener("click", () => {            //다음 버튼을 눌렀을 때
        let nextIndex = (currentIndex + 1) % sliderCount;      //현재의 값이 + 1 씩 증가
        gotoSlider(nextIndex)
    })