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hide-menu-on-scroll.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Before Semicolon</title>
<link rel="stylesheet" href="./setup.css">
<style>
body{
background-color: #1e272c;
}
.wrapper {
width: 100vw;
max-width: 425px;
height: 100vh;
position: relative;
overflow: hidden;
}
.scrolling-content {
overflow: auto;
height: 100%;
padding: 15px 15px 100px;
}
.post {
height: 80px;
margin-bottom: 20px;
}
.post:last-of-type {
margin-bottom: 0;
}
.menu {
background-color: #577483;
border: 2px solid #2e3c43;
border-radius: 8px;
padding: 10px;
position: absolute;
left: 15px;
bottom: 15px;
width: calc(100% - 30px);
}
ul {
display: flex;
justify-content: space-between;
}
ul li {
width: 75px;
height: 45px;
background-color: #2e3c43;
border-radius: 5px;
}
.post {
background-color: #2e3c43;
border-radius: 5px;
position: relative;
padding: 10px;
display: flex;
}
.post span {
background-color: #1e272c;
border-radius: 5px;
}
.post span:nth-of-type(1){
width: 65px;
height: 100%;
margin-right: 10px;
}
.post span:nth-of-type(2){
margin-top: 5px;
height: 20px;
flex: 1;
}
.post span:nth-of-type(3){
height: 10px;
width: 60%;
position: absolute;
left: 85px;
top: 45px;
}
</style>
</head>
<body>
<div class="wrapper">
<div class="scrolling-content">
<div class="post"><span></span><span></span><span></span></div>
<div class="post"><span></span><span></span><span></span></div>
<div class="post"><span></span><span></span><span></span></div>
<div class="post"><span></span><span></span><span></span></div>
<div class="post"><span></span><span></span><span></span></div>
<div class="post"><span></span><span></span><span></span></div>
<div class="post"><span></span><span></span><span></span></div>
<div class="post"><span></span><span></span><span></span></div>
<div class="post"><span></span><span></span><span></span></div>
<div class="post"><span></span><span></span><span></span></div>
<div class="post"><span></span><span></span><span></span></div>
<div class="post"><span></span><span></span><span></span></div>
<div class="post"><span></span><span></span><span></span></div>
<div class="post"><span></span><span></span><span></span></div>
<div class="post"><span></span><span></span><span></span></div>
<div class="post"><span></span><span></span><span></span></div>
<div class="post"><span></span><span></span><span></span></div>
<div class="post"><span></span><span></span><span></span></div>
<div class="post"><span></span><span></span><span></span></div>
<div class="post"><span></span><span></span><span></span></div>
<div class="post"><span></span><span></span><span></span></div>
<div class="post"><span></span><span></span><span></span></div>
<div class="post"><span></span><span></span><span></span></div>
<div class="post"><span></span><span></span><span></span></div>
<div class="post"><span></span><span></span><span></span></div>
</div>
<div class="menu">
<ul>
<li></li>
<li></li>
<li></li>
<li></li>
</ul>
</div>
</div>
<script>
const scrollingContainer = document.querySelector('.scrolling-content');
const menu = document.querySelector('.menu');
// const handleScroll = () => {};
// const handleScroll = () => {
// let lastScrollTop = 0;
// menu.style.transition = 'transform 0.5s ease';
// const {bottom} = getComputedStyle(menu);
// // let timer = null;
//
// return (e) => {
// // clearTimeout(timer);
// // timer = setTimeout(() => {
// // menu.style.transform = 'translateY(0)';
// // }, 350);
// if (e.target.scrollTop > lastScrollTop) {
// menu.style.transform = `translateY(calc(100% + ${bottom}))`
// } else {
// menu.style.transform = 'translateY(0)'
// }
//
// lastScrollTop = e.target.scrollTop;
// }
// };
const handleScroll = () => {
let lastDirection = 'down';
let lastScrollTop = 0;
let lastScrollPositionChange = 0;
let translate = 0;
let timer = null;
// get the full height of the container plus its offset from the bottom
const {offsetHeight} = menu;
const {bottom} = getComputedStyle(menu);
const max = offsetHeight + parseInt(bottom);
return (e) => {
clearTimeout(timer);
timer = setTimeout(() => {
translate = 0;
menu.style.transition = 'transform 0.5s ease';
menu.style.transform = `translateY(0px)`;
}, 350);
// detect scroll position
let direction = e.target.scrollTop > lastScrollTop ? 'down' : 'up';
// grab position at direction change
if (lastDirection !== direction) {
lastScrollPositionChange = e.target.scrollTop;
lastDirection = direction;
}
// get the difference from the changing point and current point
const diff = Math.abs(e.target.scrollTop - lastScrollPositionChange);
menu.style.transition = 'transform 0s ease';
if (direction === 'down') {
translate = Math.min(max, diff);
menu.style.transform = `translateY(${translate}px)`
} else {
menu.style.transform = `translateY(${Math.max(0, translate - diff)}px)`
}
lastScrollTop = e.target.scrollTop;
}
};
scrollingContainer.addEventListener('scroll', handleScroll(), {passive: true});
</script>
</body>
</html>