HTML,JS
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<!DOCTYPE html>
<html lang="ko">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Can I Create Online Tutorial’s Magic CSS Indicator?</title>
<link rel="stylesheet" href="https://fonts.googleapis.com/css2?family=Material+Symbols+Outlined:opsz,wght,FILL,GRAD@48,500,0,0" />
<link rel="stylesheet" type="text/css" href="./css/reset.css"/>
<link rel="stylesheet" type="text/css" href="./css/indicator.css"/>
</head>
<body>
<div id="gnb-wrap">
<div id="gnb-indicator"></div>
<ul id="gnb">
<li>
<button class="gnb-btn"><span class="gnb-ic material-symbols-outlined">home</span></button>
<div class="gnb-txt">Home</div>
</li>
<li>
<button class="gnb-btn"><span class="gnb-ic material-symbols-outlined">person</span></button>
<div class="gnb-txt">Person</div>
</li>
<li class="on">
<button class="gnb-btn"><span class="material-symbols-outlined">forum</span></button>
<div class="gnb-txt">Comment</div>
</li>
<li>
<button class="gnb-btn"><span class="gnb-ic material-symbols-outlined">photo_camera</span></button>
<div class="gnb-txt">Photo</div>
</li>
<li>
<button class="gnb-btn"><span class="gnb-ic material-symbols-outlined">settings</span></button>
<div class="gnb-txt">Settings</div>
</li>
</ul><!-- gnb -->
</div><!-- gnb-wrap -->
<!-- [스크립트] -->
<script>
const $gnb = document.getElementById('gnb');
const $indicator = document.getElementById('gnb-indicator');
const INFO = {
size:70, pad:10, gap:5
}
$gnb.addEventListener('click',on_click_gnb);
function on_click_gnb(e){
const target = e.target;
if(!target.classList.contains('gnb-btn')){return;}
const $targetLi = target.parentElement;
const $$sibLi = Array.from($gnb.children);
const IDX = Array.prototype.indexOf.call($$sibLi, $targetLi);
$$sibLi.forEach($sib => {
$sib.classList.toggle('on',$sib == $targetLi);
});
const {size,pad,gap} = INFO;
const posX = `calc((${size}px * ${IDX}) + (${pad}px + ${gap}px * ${IDX}))`;
console.log(posX);
$indicator.style.setProperty('transform',`translateX(${posX})`);
}//on_click_gnb
</script>
</body>
</html>
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cs |
CSS
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@charset "utf-8";
@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@500;600&display=swap');
:root{
--sans-serif:'Poppins';
--black:#232227;
--white:#fefefe;
--green:#2cf8b7;
}
*{margin:0;padding:0;box-sizing:border-box;}
li{list-style-type:none;}
button{cursor:pointer;}
html,body{
background:var(--black);
font-family:var(--sans-serif); color:var(--black);
}
body{
display:flex;flex-flow:column nowrap;
justify-content:center; align-items:center;
min-height:100vh;
}
#gnb-wrap{
--size:70px;
--padding:10px;
--gap:5px;
position:relative;
height:var(--size);
padding:0 var(--padding);
background:var(--white);
border-radius:1rem;
}
#gnb{
display:flex;flex-flow:row nowrap;
justify-content:center;
gap:var(--gap);
position:relative;
width:100%; height:100%;
text-align:center;}
#gnb li{
/* outline:1px solid red; */
position:relative;width:var(--size);}
.gnb-btn{
/* outline:1px solid red; */
height:100%; aspect-ratio:1/1;
border:none;
background:transparent;
transition:transform .2s .2s;}
.gnb-btn span{pointer-events:none;}
/* on */
.on .gnb-btn{transform:translateY(-40%);}
.gnb-txt{
position:absolute;
top:100%; left:0;
width:100%;
font-size:11px;
opacity:0;
transition:all .3s .3s;
pointer-events:none;}
/* .on */
.on .gnb-txt{transform:translateY(-150%); opacity:1;}
/* INDICATOR */
#gnb-indicator{
position:absolute;
width:70px; aspect-ratio:1/1;
top:-30px; left:0; transform:translateX(calc(
(var(--size) * 2) +
(var(--padding) + var(--gap) * 2)
));
border:5px solid var(--black);
border-radius:50%;
background:var(--green);
transition:transform .3s;
pointer-events:none;}
#gnb-indicator::before,
#gnb-indicator::after{
--pos:-22px;
content:'';display:block;position:absolute;
top:41%;
width:20px; aspect-ratio:1/1;
background:transparent;
}
#gnb-indicator::before{
left:var(--pos);
border-top-right-radius:20px;
box-shadow:1px -10px 0 0 var(--black);
}
#gnb-indicator::after{
right:var(--pos);
border-top-left-radius:20px;
box-shadow:-1px -10px 0 0 var(--black);
}
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cs |
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