패럴랙스 이펙트

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section1

신은 용기있는자를 결코 버리지 않는다.

section2

용기는 역경에 있어서의 빛이다.

section3

용기가 있는 곳에 희망이 있다.

section4

준비된 자만이 기회를 얻는다.

section5

속도가 느릴 수 있다. 그러나 노력하지 않는 것은 방법이 없다.

section6

우리가 두려워해야 할 것은 느린 것이 아니라, '멈춤'이다.

section7

잘 살아라 그게 최고의 복수다.

section8

걱정은 인생의 적이다.

section9

일 분 전만큼 먼 시간은 없다.

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window.addEventListener("scroll", () => {
    let scrollTop = window.pageYOffset || window.scrollY || document.documentElement.scrollTop;

    //01
    // if(scrollTop > 0){
    //     document.querySelector("#parallax__nav").classList.add("show");
    // } else {
    //     document.querySelector("#parallax__nav").classList.remove("show");
    // }                                스크롤바 0보다 커지면 메뉴가 나온다.

    // 02;
    if (scrollTop > document.body.scrollHeight - window.outerHeight) {
        document.querySelector("#parallax__top").classList.add("show");
    } else {
        document.querySelector("#parallax__top").classList.remove("show");
    }
    console.log();

    document.querySelector("#parallax__info span").innerText = Math.floor(scrollTop);

    // document.querySelector("#parallax__info span").innerText = Math.ceil(scrollTop);
});

// top 버튼
document.querySelector("#parallax__top").addEventListener("click", () => {
    window.scrollTo({ left: 0, top: 0, behavior: "smooth" });
});

//03
let nowScroll = true;
let lastScroll = 0;

function scrollProgress() {
    nowScroll = true;

    setInterval(() => {
        if (nowScroll) {
            nowScroll = false;
            hasScroll();
        }
    }, 300);
}

function hasScroll() {
    let scrollTop = window.pageYOffset || window.scrollY || document.documentElement.scrollTop;

    if (scrollTop < lastScroll) {
        document.querySelector("#parallax__nav").classList.add("show");
    } else {
        document.querySelector("#parallax__nav").classList.remove("show");
    }
    lastScroll = scrollTop;
}

window.addEventListener("scroll", scrollProgress);

<header id="header">
    <h1>Javascript Parallax Effect03</h1>
    <p>패럴랙스 이펙트 - 숨김 메뉴</p>
    <ul>
        <li><a href="parallaxEffect01.html">1</a></li>
        <li><a href="parallaxEffect02.html">2</a></li>
        <li class="active"><a href="parallaxEffect03.html">3</a></li>
        <li><a href="parallaxEffect04.html">4</a></li>
        <li><a href="parallaxEffect05.html">5</a></li>
        <li><a href="parallaxEffect06.html">6</a></li>
        <li><a href="parallaxEffect07.html">7</a></li>
    </ul>
</header>
<!-- //header -->

<nav id="parallax__nav">
    <ul>
        <li class="active"><a href="#section1">메뉴1</a></li>
        <li><a href="#section2">메뉴2</a></li>
        <li><a href="#section3">메뉴3</a></li>
        <li><a href="#section4">메뉴4</a></li>
        <li><a href="#section5">메뉴5</a></li>
        <li><a href="#section6">메뉴6</a></li>
        <li><a href="#section7">메뉴7</a></li>
        <li><a href="#section8">메뉴8</a></li>
        <li><a href="#section9">메뉴9</a></li>
    </ul>
</nav>
<!-- //parallax__nav -->

<div id="parallax__top">Top</div>
<!-- //parallax__top -->

<main id="parallax__cont">
    <div id="contents">
        <section id="section1" class="content__item">
            <span class="content__item__num">01</span>
            <h2 class="content__item__title">section1</h2>
            <figure class="content__item__imgWrap">
                <div class="content__item__img"></div>
            </figure>
            <p class="content__item__desc">신은 용기있는자를 결코 버리지 않는다.</p>
        </section>
        <!-- //section1 -->

        <section id="section2" class="content__item">
            <span class="content__item__num">02</span>
            <h2 class="content__item__title">section2</h2>
            <figure class="content__item__imgWrap">
                <div class="content__item__img"></div>
            </figure>
            <p class="content__item__desc">용기는 역경에 있어서의 빛이다.</p>
        </section>
        <!-- //section2 -->

        <section id="section3" class="content__item">
            <span class="content__item__num">03</span>
            <h2 class="content__item__title">section3</h2>
            <figure class="content__item__imgWrap">
                <div class="content__item__img"></div>
            </figure>
            <p class="content__item__desc">용기가 있는 곳에 희망이 있다.</p>
        </section>
        <!-- //section3 -->

        <section id="section4" class="content__item">
            <span class="content__item__num">04</span>
            <h2 class="content__item__title">section4</h2>
            <figure class="content__item__imgWrap">
                <div class="content__item__img"></div>
            </figure>
            <p class="content__item__desc">준비된 자만이 기회를 얻는다.</p>
        </section>
        <!-- //section4 -->

        <section id="section5" class="content__item">
            <span class="content__item__num">05</span>
            <h2 class="content__item__title">section5</h2>
            <figure class="content__item__imgWrap">
                <div class="content__item__img"></div>
            </figure>
            <p class="content__item__desc">속도가 느릴 수 있다. 그러나 노력하지 않는 것은 방법이 없다.</p>
        </section>
        <!-- //section5 -->

        <section id="section6" class="content__item">
            <span class="content__item__num">06</span>
            <h2 class="content__item__title">section6</h2>
            <figure class="content__item__imgWrap">
                <div class="content__item__img"></div>
            </figure>
            <p class="content__item__desc">우리가 두려워해야 할 것은 느린 것이 아니라, '멈춤'이다.</p>
        </section>
        <!-- //section6 -->

        <section id="section7" class="content__item">
            <span class="content__item__num">07</span>
            <h2 class="content__item__title">section7</h2>
            <figure class="content__item__imgWrap">
                <div class="content__item__img"></div>
            </figure>
            <p class="content__item__desc">잘 살아라 그게 최고의 복수다.</p>
        </section>
        <!-- //section7 -->

        <section id="section8" class="content__item">
            <span class="content__item__num">08</span>
            <h2 class="content__item__title">section8</h2>
            <figure class="content__item__imgWrap">
                <div class="content__item__img"></div>
            </figure>
            <p class="content__item__desc">걱정은 인생의 적이다.</p>
        </section>
        <!-- //section8 -->

        <section id="section9" class="content__item">
            <span class="content__item__num">09</span>
            <h2 class="content__item__title">section9</h2>
            <figure class="content__item__imgWrap">
                <div class="content__item__img"></div>
            </figure>
            <p class="content__item__desc">일 분 전만큼 먼 시간은 없다.</p>
        </section>
        <!-- //section9 -->
    </div>
</main>
<!-- //main -->

<aside id="parallax__info">
    <div class="scroll">scrollTop : <span>0</span>px</div>
</aside>

/* parallax__nav */
#parallax__nav {
    position: fixed;
    right: 20px;
    top: 20px;
    z-index: 2000;
    background-color: rgba(0, 0, 0, 0.4);
    padding: 20px 30px;
    border-radius: 50px;
}
#parallax__nav li {
    display: inline;
    margin: 0 5px;
}
#parallax__nav li a {
    display: inline-block;
    height: 30px;
    padding: 5px 20px;
    text-align: center;
    line-height: 30px;
}
#parallax__nav li.active a {
    background: #fff;
    color: #000;
    border-radius: 20px;
    box-sizing: content-box;
}
#parallax__cont {
    max-width: 1600px;
    width: 98%;
    margin: 0 auto;
    /* background-color: rgba(255, 255, 255, 0.1); */
}
.content__item {
    width: 1000px;
    max-width: 70vw;
    margin: 30vw auto;
    /* background-color: rgba(255, 255, 255, 0.3); */
    text-align: left;
    margin-right: 0;
    position: relative;
    padding-top: 8vw;
}
.content__item:nth-child(even) {
    margin-left: 0;
    text-align: right;
}
.content__item__num {
    font-size: 35vw;
    font-weight: 100;
    font-family: "Lato";
    position: absolute;
    left: -5vw;
    top: -13vw;
    opacity: 0.07;
    z-index: -2;
}
.content__item:nth-child(even) .content__item__num {
    left: auto;
    right: -5vw;
}
.content__item__title {
    font-weight: 400;
    text-transform: capitalize;
}
.content__item__imgWrap {
    width: 100%;
    padding-bottom: 56.25%;
    background: #000;
    position: relative;
    overflow: hidden;
    z-index: -1;
}
.content__item__img {
    position: absolute;
    background: url('../assets/img/pallacx_bg08.jpg');
    background-repeat: no-repeat;
    background-position: center center;
    background-size: cover;
    width: 110%;
    height: 110%;
    left: -5%;
    top: -5%;
    filter: saturate(0%);
    transition: all 1s;
}

/* section image */
.content__item:nth-child(1) .content__item__img {
    background-image: url("../assets/img/pallacx_bg01.jpg");
}
.content__item:nth-child(2) .content__item__img {
    background-image: url("../assets/img/pallacx_bg02.jpg");
}
.content__item:nth-child(3) .content__item__img {
    background-image: url("../assets/img/pallacx_bg03.jpg");
}
.content__item:nth-child(4) .content__item__img {
    background-image: url("../assets/img/pallacx_bg04.jpg");
}
.content__item:nth-child(5) .content__item__img {
    background-image: url("../assets/img/pallacx_bg05.jpg");
}
.content__item:nth-child(6) .content__item__img {
    background-image: url("../assets/img/pallacx_bg06.jpg");
}
.content__item:nth-child(7) .content__item__img {
    background-image: url("../assets/img/pallacx_bg07.jpg");
}
.content__item:nth-child(8) .content__item__img {
    background-image: url("../assets/img/pallacx_bg08.jpg");
}
.content__item:nth-child(9) .content__item__img {
    background-image: url("../assets/img/pallacx_bg09.jpg");
}

.content__item__desc {
    font-size: 4vw;
    line-height: 1.4;
    margin-top: -4vw;
    margin-left: -4vw;
    word-break: keep-all;
}
.content__item:nth-child(even) .content__item__desc {
    margin-left: auto;
    margin-right: -4vw;
}
#parallax__info {
    position: fixed;
    left: 20px;
    bottom: 20px;
    z-index: 2000;
    background-color: rgba(0, 0, 0, 0.4);
    color: #fff;
    padding: 20px;
    border-radius: 10px;
}
#parallax__info li,
.scroll {
    line-height: 1.4;
}
@media (max-width: 800px) {
    #parallax__cont {
        margin-top: 70vw;
    }
    #parallax__nav {
        padding: 10px;
        right: auto;
        left: 10px;
        top: 50%;
        transform: translateY(-50%);
        border-radius: 5px;
        background-color: rgba(0, 0, 0, 0.8);
    }
    #parallax__nav li {
        display: block;
        margin: 5px;
    }
    #parallax__nav li a {
        font-size: 14px;
        padding: 5px;
        border-radius: 5px;
        height: auto;
        line-height: 1;
    }
    #parallax__nav li.active a {
        border-radius: 5px;
    }
    #parallax__info {
        left: 10px;
        bottom: 10px;
    }
}
#parallax__dot {
    position: fixed;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 10000;
    background: rgba(0, 0, 0, 0.4);
    padding: 20px 10px;
    border-radius: 30px;
}
#parallax__dot li {
    position: relative;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    margin: 12px 8px;
    box-shadow: 0 0 0 2px rgba(255, 255, 255, 0);
    transition: box-shadow 0.2s ease;
}
#parallax__dot li a {
    background: #fff;
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    border-radius: 50%;
    transition: transform 0.2s ease;
}
#parallax__dot li span {
    display: none;
}
#parallax__dot li.active {
    box-shadow: 0 0 0 2px rgba(255, 255, 255, 1);
}
#parallax__dot li.active a {
    transform: scale(0.4);
}