패럴랙스 효과
패럴랙스 이펙트 - 메뉴 이동
오늘은 메뉴바를 누르면 해당 구역으로 이동하고, offsetTop값을 이용해 해당 영역에 가면 메뉴에 불이 들어오는 효과를 만들어보겠습니다.
결과
HTML 작성
HTML 구조는 예제1번을 나타내는 설명 nav와, 사진과 설명이 나오는 parallax__cont, offset메뉴바가 나오는 parallax__info 세개로 구성하였습니다.
소스 보기
<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>
<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">산다는것 그것은 치열한 전투이다.</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">하루에 3시간을 걸으면 7년 후에 지구를 한바퀴 돌 수 있다.</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">내일은 내일의 태양이 뜬다.</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">배고픈 자 밥솥을 열어라.</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">그대 자신의 영혼을 탐구하라.</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">돈이 없는 것은 죄다.</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">무전 유죄, 유전 무죄</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">내 주머니의 푼돈이 남 주머니에 있는 거금보다 낫다.</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">최고에 도달하려면 최저에서 시작하라.</p>
</section>
<!-- //section9 -->
</div>
</main>
<!-- //main -->
<aside id="parallax__info">
<div class="scroll">scrollTop : <span>0</span>px</div>
<div class="info">
<ul>
<li>#section1 offset() : <span class="offset1">0</span>px</li>
<li>#section2 offset() : <span class="offset2">0</span>px</li>
<li>#section3 offset() : <span class="offset3">0</span>px</li>
<li>#section4 offset() : <span class="offset4">0</span>px</li>
<li>#section5 offset() : <span class="offset5">0</span>px</li>
<li>#section6 offset() : <span class="offset6">0</span>px</li>
<li>#section7 offset() : <span class="offset7">0</span>px</li>
<li>#section8 offset() : <span class="offset8">0</span>px</li>
<li>#section9 offset() : <span class="offset9">0</span>px</li>
</ul>
</div>
</aside>
CSS 작성
보기좋게 CSS를 넣어줍니다.
결과
/* 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/effect_bg19@2x.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;
}
.content__item:nth-child(1) .content__item__img {
background-image: url(../assets/img/effect_bg18@2x.jpg);
}
.content__item:nth-child(2) .content__item__img {
background-image: url(../assets/img/effect_bg19@2x.jpg);
}
.content__item:nth-child(3) .content__item__img {
background-image: url(../assets/img/effect_bg20@2x.jpg);
}
.content__item:nth-child(4) .content__item__img {
background-image: url(../assets/img/effect_bg17@2x.jpg);
}
.content__item:nth-child(5) .content__item__img {
background-image: url(../assets/img/effect_bg16@2x.jpg);
}
.content__item:nth-child(6) .content__item__img {
background-image: url(../assets/img/effect_bg15@2x.jpg);
}
.content__item:nth-child(7) .content__item__img {
background-image: url(../assets/img/effect_bg14@2x.jpg);
}
.content__item:nth-child(8) .content__item__img {
background-image: url(../assets/img/effect_bg13@2x.jpg);
}
.content__item:nth-child(9) .content__item__img {
background-image: url(../assets/img/effect_bg12@2x.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;
}
}
JS 작성
자바스크립트가 매우 중요합니다. 일단 스크롤했을 때 이벤트를 주어서 scrollTop에 scroll값을 넣어줍니다. 그리고 각각의 섹션의 offsetTop값을 for문을 이용해서 구해주고 만들어 놓은 메뉴바에 그 값을 넣어줍니다. 현재 스크롤값(scrollTop)값이 각각의 섹션 offset값보다 크거나 같을 때 상단 메뉴바에 active 클래스를 추가해주고, 나머지는 제거해주는 스크립트를 for문과 forEach문을 이용해서 만들어놨으니 주석표시도 잘 확인해 주시기 바랍니다.
window.addEventListener("scroll", () => {
// let scrollTop = window.pageYOffset;
// let scrollTop = window.scrollY;
// let scrollTop = document.documentElement.scrollTop;
let scrollTop = window.pageYOffset || window.scrollY || document.documentElement.scrollTop;
// if(scrollTop >= document.getElementById("section1").offsetTop) {
// document.querySelectorAll("#parallax__nav li").forEach(li => {
// li.classList.remove("active");
// });
// document.querySelector("#parallax__nav li:nth-child(1)").classList.add("active")
// };
// if(scrollTop >= document.getElementById("section2").offsetTop) {
// document.querySelectorAll("#parallax__nav li").forEach(li => {
// li.classList.remove("active");
// });
// document.querySelector("#parallax__nav li:nth-child(2)").classList.add("active")
// };
// if(scrollTop >= document.getElementById("section3").offsetTop) {
// document.querySelectorAll("#parallax__nav li").forEach(li => {
// li.classList.remove("active");
// });
// document.querySelector("#parallax__nav li:nth-child(3)").classList.add("active")
// };
// if(scrollTop >= document.getElementById("section4").offsetTop) {
// document.querySelectorAll("#parallax__nav li").forEach(li => {
// li.classList.remove("active");
// });
// document.querySelector("#parallax__nav li:nth-child(4)").classList.add("active")
// };
// if(scrollTop >= document.getElementById("section5").offsetTop) {
// document.querySelectorAll("#parallax__nav li").forEach(li => {
// li.classList.remove("active");
// });
// document.querySelector("#parallax__nav li:nth-child(5)").classList.add("active")
// };
// if(scrollTop >= document.getElementById("section6").offsetTop) {
// document.querySelectorAll("#parallax__nav li").forEach(li => {
// li.classList.remove("active");
// });
// document.querySelector("#parallax__nav li:nth-child(6)").classList.add("active")
// };
// if(scrollTop >= document.getElementById("section7").offsetTop) {
// document.querySelectorAll("#parallax__nav li").forEach(li => {
// li.classList.remove("active");
// });
// document.querySelector("#parallax__nav li:nth-child(7)").classList.add("active")
// };
// if(scrollTop >= document.getElementById("section8").offsetTop) {
// document.querySelectorAll("#parallax__nav li").forEach(li => {
// li.classList.remove("active");
// });
// document.querySelector("#parallax__nav li:nth-child(8)").classList.add("active")
// };
// if(scrollTop >= document.getElementById("section9").offsetTop) {
// document.querySelectorAll("#parallax__nav li").forEach(li => {
// li.classList.remove("active");
// });
// document.querySelector("#parallax__nav li:nth-child(9)").classList.add("active")
// };
// for문
// for (let i = 1; i<= 9; i++){
// if(scrollTop >= document.getElementById("section" + i ).offsetTop) {
// document.querySelectorAll("#parallax__nav li").forEach(li => {
// li.classList.remove("active");
// });
// document.querySelector("#parallax__nav li:nth-child("+ i +")").classList.add("active")
// };
// };
// forEach문
document.querySelectorAll(".content__item").forEach((element, index)=>{
if(scrollTop >= element.offsetTop - 2){
document.querySelectorAll("#parallax__nav li").forEach(li => {
li.classList.remove("active");
});
document.querySelector("#parallax__nav li:nth-child(" + (index + 1) + ")").classList.add("active");
};
});
//info
document.querySelector(".scroll span").innerText = Math.round(scrollTop);
// offsetTop값 for문 이용해서 구하기
for(let i = 1; i<= 9; i++ ) {
document.querySelector(".offset" + i ).innerText = document.getElementById("section" + i).offsetTop;
};
});
// 스크롤 이동 , 클릭하면 스무스하게 부드럽게 움직이게 설정
document.querySelectorAll("#parallax__nav li a").forEach(li => {
li.addEventListener("click", (e) => {
e.preventDefault();
document.querySelector(li.getAttribute("href")).scrollIntoView({
behavior: "smooth"
});
});
});
// document.querySelector(".offset1").innerText = document.getElementById("section1").offsetTop;
// document.querySelector(".offset2").innerText = document.getElementById("section2").offsetTop;
// document.querySelector(".offset3").innerText = document.getElementById("section3").offsetTop;
// document.querySelector(".offset4").innerText = document.getElementById("section4").offsetTop;
// document.querySelector(".offset5").innerText = document.getElementById("section5").offsetTop;
// document.querySelector(".offset6").innerText = document.getElementById("section6").offsetTop;
// document.querySelector(".offset7").innerText = document.getElementById("section7").offsetTop;
// document.querySelector(".offset8").innerText = document.getElementById("section8").offsetTop;
// document.querySelector(".offset9").innerText = document.getElementById("section9").offsetTop;
보기쉬운 그림 설명
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