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How can I add a slide animation in that code

I'm new to JavaScript so with the help of the community I manage to create that code but I want the slide down when I click on a project to have a smooth animation but I don't know where to put the animation code transition: all .5s ease-in-out; in the CSS or I don't know if I can do it with the JavaScript code directly.
const projectContain = document.querySelectorAll(".projet-contain");
projectContain.forEach((elm) => {
elm.addEventListener("click", function() {
let projectContent = elm.querySelector(".project-content");
let arrow = elm.querySelector(".arrow-down");
if (projectContent.style.display !== "none") {
projectContent.style.display = "none";
arrow.classList.toggle('rotate-arrow')
} else {
projectContent.style.display = "flex";
arrow.classList.toggle('rotate-arrow')
}
});
});
body {
background-color: purple;
}
.projet-contain {
display: flex;
flex-direction: column;
margin-bottom: 50px;
width: auto;
height: auto;
background: radial-gradient(circle, rgba(238, 174, 202, 0.200) 0%, rgba(148, 188, 233, 0.200) 100%);
;
border-radius: 10px 10px 10px 10px;
padding: 10px;
user-select: none;
}
.preview {
display: flex;
justify-content: space-between;
align-items: center;
}
section>div>div>a {
text-decoration: none;
color: white;
}
.convertigo {
width: 10vw;
}
.arrow-down {
transition: transform 0.5s;
width: 1.5vw;
-webkit-filter: invert(100%);
/* safari 6.0 - 9.0 */
filter: invert(100%);
}
.rotate-arrow {
transform: rotate(180deg);
}
.project-content {
justify-content: center;
}
<section>
<div class="projet-contain">
<div class="preview">
<a>Projet Convertigo</a>
<img class="arrow-down" src="images/down-arrow-svgrepo-com.svg" alt="ꜜ">
<img src="images/Convertigo.png" class="convertigo" alt="">
</div>
<div class="project-content" style="display:none;">
<a>c'est la div 1 Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cum quo iure culpa libero? Dolor incidunt, adipisci, dignissimos sunt odio expedita ullam sapiente officiis, architecto culpa reiciendis voluptatum ut dolorum ipsa vero nihil? Earum voluptate molestiae nemo! Iste, sit neque. Accusantium, sed aliquam omnis ut laboriosam maxime obcaecati libero natus eius perferendis ipsum ipsam. Nostrum facilis blanditiis voluptas ipsa molestiae inventore consequatur unde velit quas quod, quo obcaecati commodi praesentium? Earum cumque velit vero a facilis voluptatem quis debitis molestiae tenetur consequuntur, commodi architecto beatae id quas rerum unde rem alias itaque amet sed explicabo. Ad rem, quod possimus dignissimos deleniti molestiae natus magni ducimus sit quis dicta voluptatibus itaque quasi reprehenderit facilis fuga soluta alias! Quasi suscipit soluta dignissimos nulla iusto dolores amet temporibus, molestias debitis voluptate praesentium similique distinctio corrupti. Provident numquam cum nostrum aut commodi incidunt ipsam quibusdam laudantium mollitia aspernatur, magni ab perspiciatis inventore exercitationem consequuntur, laborum autem dolorum doloremque omnis voluptatibus illo nesciunt? Ipsam voluptas atque blanditiis alias facere laudantium error doloremque maiores magni enim deserunt iste architecto, voluptatem, porro quisquam quas, deleniti tempore. Sed tempore nulla, perspiciatis natus temporibus debitis maiores ipsam illum esse ut maxime quia in consequuntur ratione error veritatis, quod aut! Enim.</a>
<div>
<img src="images/matete.webp" alt="">
</div>
</div>
</div>
<div class="projet-contain">
<div class="preview">
<a>Projet Convertigo</a>
<img class="arrow-down" src="images/down-arrow-svgrepo-com.svg" alt="ꜜ">
<img src="images/Convertigo.png" class="convertigo" alt="">
</div>
<div class="project-content" style="display:none;">
<a>c'est la div 2</a>
</div>
</div>
<div class="projet-contain">
<div class="preview">
<a>Projet Convertigo</a>
<img class="arrow-down" src="images/down-arrow-svgrepo-com.svg" alt="ꜜ">
<img src="images/Convertigo.png" class="convertigo" alt="">
</div>
<div class="project-content" style="display:none;">
<a>c'est la div 3</a>
</div>
</div>
</section>

Is this what you're looking for?
const projectContain = document.querySelectorAll(".projet-contain");
projectContain.forEach((elm) => {
elm.addEventListener("click", function() {
let projectContent = elm.querySelector(".project-content");
let arrow = elm.querySelector(".arrow-down");
arrow.classList.toggle('rotate-arrow');
projectContent.classList.toggle("display");
});
});
body {
background-color: purple;
}
.projet-contain {
display: flex;
flex-direction: column;
margin-bottom: 50px;
width: auto;
height: auto;
background: radial-gradient(circle, rgba(238, 174, 202, 0.200) 0%, rgba(148, 188, 233, 0.200) 100%);
;
border-radius: 10px 10px 10px 10px;
padding: 10px;
user-select: none;
}
.preview {
display: flex;
justify-content: space-between;
align-items: center;
}
section>div>div>a {
text-decoration: none;
color: white;
}
.convertigo {
width: 10vw;
}
.arrow-down {
transition: transform 0.5s;
width: 1.5vw;
-webkit-filter: invert(100%);
/* safari 6.0 - 9.0 */
filter: invert(100%);
}
.rotate-arrow {
transform: rotate(180deg);
}
.project-content {
justify-content: center;
max-height: 0;
overflow: hidden;
transition: max-height 500ms ease-out;
}
.display {
max-height: 100vh;
}
<section>
<div class="projet-contain">
<div class="preview">
<a>Projet Convertigo</a>
<img class="arrow-down" src="images/down-arrow-svgrepo-com.svg" alt="ꜜ">
<img src="images/Convertigo.png" class="convertigo" alt="">
</div>
<div class="project-content">
<a>c'est la div 1 Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cum quo iure culpa libero? Dolor
incidunt, adipisci, dignissimos sunt odio expedita ullam sapiente officiis, architecto culpa reiciendis
voluptatum ut dolorum ipsa vero nihil? Earum voluptate molestiae nemo! Iste, sit neque. Accusantium, sed
aliquam omnis ut laboriosam maxime obcaecati libero natus eius perferendis ipsum ipsam. Nostrum facilis
blanditiis voluptas ipsa molestiae inventore consequatur unde velit quas quod, quo obcaecati commodi
praesentium? Earum cumque velit vero a facilis voluptatem quis debitis molestiae tenetur consequuntur, commodi
architecto beatae id quas rerum unde rem alias itaque amet sed explicabo. Ad rem, quod possimus dignissimos
deleniti molestiae natus magni ducimus sit quis dicta voluptatibus itaque quasi reprehenderit facilis fuga
soluta alias! Quasi suscipit soluta dignissimos nulla iusto dolores amet temporibus, molestias debitis
voluptate praesentium similique distinctio corrupti. Provident numquam cum nostrum aut commodi incidunt ipsam
quibusdam laudantium mollitia aspernatur, magni ab perspiciatis inventore exercitationem consequuntur, laborum
autem dolorum doloremque omnis voluptatibus illo nesciunt? Ipsam voluptas atque blanditiis alias facere
laudantium error doloremque maiores magni enim deserunt iste architecto, voluptatem, porro quisquam quas,
deleniti tempore. Sed tempore nulla, perspiciatis natus temporibus debitis maiores ipsam illum esse ut maxime
quia in consequuntur ratione error veritatis, quod aut! Enim.</a>
<div>
<img src="images/matete.webp" alt="">
</div>
</div>
</div>
<div class="projet-contain">
<div class="preview">
<a>Projet Convertigo</a>
<img class="arrow-down" src="images/down-arrow-svgrepo-com.svg" alt="ꜜ">
<img src="images/Convertigo.png" class="convertigo" alt="">
</div>
<div class="project-content">
<a>c'est la div 2</a>
</div>
</div>
<div class="projet-contain">
<div class="preview">
<a>Projet Convertigo</a>
<img class="arrow-down" src="images/down-arrow-svgrepo-com.svg" alt="ꜜ">
<img src="images/Convertigo.png" class="convertigo" alt="">
</div>
<div class="project-content">
<a>c'est la div 3</a>
</div>
</div>
</section>

Menu doesn't close after clicking link in nav

When I open menu in smaller resolution(mobile resolution) and click on some link from the menu its not closing, its still there the menu. Can you help me? I think there is missing something in js code but I don't know what I can write more to close menu after clicking on the link from the menu.
const body = document.querySelector("body");
const navbar = document.querySelector(".navbar");
const menuBtn = document.querySelector(".menu-btn");
const cancelBtn = document.querySelector(".cancel-btn");
menuBtn.onclick = () => {
navbar.classList.add("show");
menuBtn.classList.add("hide");
body.classList.add("disabled");
}
cancelBtn.onclick = () => {
body.classList.remove("disabled");
navbar.classList.remove("show");
menuBtn.classList.remove("hide");
}
window.onscroll = () => {
this.scrollY > 20 ? navbar.classList.add("sticky") : navbar.classList.remove("sticky");
}
#import url('https://fonts.googleapis.com/css2?family=Poppins:wght#200;300;400;500;600;700&display=swap');
* {
margin: 0;
padding: 0;
box-sizing: border-box;
font-family: 'Poppins', sans-serif;
}
/* custom scroll bar */
::-webkit-scrollbar {
width: 10px;
}
::-webkit-scrollbar-track {
background: #f1f1f1;
}
::-webkit-scrollbar-thumb {
background: #888;
}
::selection {
background: rgb(0, 123, 255, 0.3);
}
.content {
max-width: 1250px;
margin: auto;
padding: 0 30px;
}
.navbar {
position: fixed;
width: 100%;
z-index: 2;
padding: 25px 0;
transition: all 0.3s ease;
}
.navbar.sticky {
background: #1b1b1b;
padding: 10px 0;
box-shadow: 0px 3px 5px 0px rgba(0, 0, 0, 0.1);
}
.navbar .content {
display: flex;
align-items: center;
justify-content: space-between;
}
.navbar .logo a {
color: #fff;
font-size: 30px;
font-weight: 600;
text-decoration: none;
}
.navbar .menu-list {
display: inline-flex;
}
.menu-list li {
list-style: none;
}
.menu-list li a {
color: #fff;
font-size: 18px;
font-weight: 500;
margin-left: 25px;
text-decoration: none;
transition: all 0.3s ease;
}
.menu-list li a:hover {
color: #007bff;
}
.banner {
background: url("banner.jpg") no-repeat;
height: 100vh;
background-size: cover;
background-position: center;
background-attachment: fixed;
}
.about {
padding: 30px 0;
}
.about .title {
font-size: 38px;
font-weight: 700;
}
.about p {
padding-top: 20px;
text-align: justify;
}
.icon {
color: #fff;
font-size: 20px;
cursor: pointer;
display: none;
}
.menu-list .cancel-btn {
position: absolute;
right: 30px;
top: 20px;
}
#media (max-width: 1230px) {
.content {
padding: 0 60px;
}
}
#media (max-width: 1100px) {
.content {
padding: 0 40px;
}
}
#media (max-width: 900px) {
.content {
padding: 0 30px;
}
}
#media (max-width: 868px) {
body.disabled {
overflow: hidden;
}
.icon {
display: block;
}
.icon.hide {
display: none;
}
.navbar .menu-list {
position: fixed;
height: 100vh;
width: 100%;
max-width: 400px;
left: -100%;
top: 0px;
display: block;
padding: 40px 0;
text-align: center;
background: #222;
transition: all 0.3s ease;
}
.navbar.show .menu-list {
left: 0%;
}
.navbar .menu-list li {
margin-top: 45px;
}
.navbar .menu-list li a {
font-size: 23px;
margin-left: -100%;
transition: 0.6s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}
.navbar.show .menu-list li a {
margin-left: 0px;
}
}
#media (max-width: 380px) {
.navbar .logo a {
font-size: 27px;
}
}
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Sticky Navigation Bar | CodingNepal</title>
<link rel="stylesheet" href="style.css">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.3/css/all.min.css" />
</head>
<body>
<nav class="navbar">
<div class="content">
<div class="logo">
CodingNepal
</div>
<ul class="menu-list">
<div class="icon cancel-btn">
<i class="fas fa-times"></i>
</div>
<li>Home</li>
<li>About</li>
<li>Services</li>
<li>Features</li>
<li>Contact</li>
</ul>
<div class="icon menu-btn">
<i class="fas fa-bars"></i>
</div>
</div>
</nav>
<div class="banner"></div>
<div class="about">
<div class="content">
<div class="title">Responsive Sticky Navigation Menu Bar on Scroll using HTML CSS & JavaScript</div>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quo impedit atque consequatur! Iusto distinctio temporibus repellendus labore odit adipisci harum ipsa beatae natus, eum eius, hic aperiam odio! Quasi molestias magnam illo voluptatem iusto
ipsam blanditiis, tempore cumque reiciendis quaerat vero tenetur, sequi dolores libero voluptas vitae voluptate placeat dolorum modi ipsa nisi repellat facilis aliquam asperiores. Aut nam repellat harum quas saepe dolorum voluptates ratione, itaque
consectetur explicabo a facilis rem mollitia maxime repudiandae fuga reprehenderit, odio cum incidunt labore molestiae quis non perferendis ipsam. Illum, in, deserunt. Ipsa.</p>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Impedit hic excepturi nobis id, eos dolor libero, nam assumenda, at culpa quos perspiciatis ratione ea modi! Natus sapiente a, explicabo sit quisquam eligendi esse provident eos enim doloremque
blanditiis aut placeat veniam, libero nostrum quae. Ipsam, iste reprehenderit minima accusantium illo dolorem recusandae, ipsa autem quidem reiciendis a mollitia sit tenetur.</p>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Sint doloremque perspiciatis voluptate ducimus reiciendis rem expedita voluptatibus dicta harum, quo, aspernatur maiores possimus officia quod? Aliquid molestiae illo sequi, tempora perferendis
at incidunt nam porro voluptatibus, iste aperiam blanditiis adipisci ducimus repellendus distinctio nostrum ipsum! Voluptas facilis cum, atque tempora magnam beatae sequi! Doloribus expedita, cupiditate quo quod nemo aliquam, mollitia cum ea nam
ullam soluta temporibus! Repudiandae incidunt consequatur distinctio deleniti obcaecati sit facilis unde, quisquam veniam ad doloribus!</p>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Amet veniam error deleniti cum beatae non assumenda illum est dolores, possimus suscipit quibusdam eveniet id fuga dolore unde modi, sapiente voluptas. Mollitia veritatis explicabo cumque
enim quia voluptates provident totam perferendis excepturi animi assumenda optio minus laudantium eveniet possimus amet blanditiis dolore in fuga atque, earum officia tempora quam similique est.</p>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Itaque ad sunt distinctio quidem incidunt cupiditate sequi deleniti, corrupti officia nam veritatis facilis veniam dolorum enim nisi ipsum dolor rem! Doloribus, eaque odit voluptatem iste
laboriosam provident facere quo. Cum repellat pariatur, error ratione repellendus nisi quam culpa tempora facere in atque nesciunt, magni est aliquid unde soluta optio! Dolore pariatur, quaerat quo in cupiditate deleniti exercitationem. Facilis
suscipit corporis unde aut minima nihil, eum molestias itaque, tenetur, beatae ipsa at!</p>
</div>
</div>
</body>

You need to close the menu on link click as well as cancel. I've created a function for that to avoid duplication.
const body = document.querySelector("body");
const navbar = document.querySelector(".navbar");
const menuBtn = document.querySelector(".menu-btn");
const cancelBtn = document.querySelector(".cancel-btn");
const menuLinks = document.querySelectorAll('.menu-list li a');
const closeMenu = () => {
body.classList.remove("disabled");
navbar.classList.remove("show");
menuBtn.classList.remove("hide");
};
menuBtn.onclick = () => {
navbar.classList.add("show");
menuBtn.classList.add("hide");
body.classList.add("disabled");
};
cancelBtn.onclick = () => {
closeMenu();
};
menuLinks.forEach(link => {
link.onclick = () => {
closeMenu();
};
});
window.onscroll = () => {
this.scrollY > 20 ? navbar.classList.add("sticky") : navbar.classList.remove("sticky");
};
#import url('https://fonts.googleapis.com/css2?family=Poppins:wght#200;300;400;500;600;700&display=swap');
* {
margin: 0;
padding: 0;
box-sizing: border-box;
font-family: 'Poppins', sans-serif;
}
/* custom scroll bar */
::-webkit-scrollbar {
width: 10px;
}
::-webkit-scrollbar-track {
background: #f1f1f1;
}
::-webkit-scrollbar-thumb {
background: #888;
}
::selection {
background: rgb(0, 123, 255, 0.3);
}
.content {
max-width: 1250px;
margin: auto;
padding: 0 30px;
}
.navbar {
position: fixed;
width: 100%;
z-index: 2;
padding: 25px 0;
transition: all 0.3s ease;
}
.navbar.sticky {
background: #1b1b1b;
padding: 10px 0;
box-shadow: 0px 3px 5px 0px rgba(0, 0, 0, 0.1);
}
.navbar .content {
display: flex;
align-items: center;
justify-content: space-between;
}
.navbar .logo a {
color: #fff;
font-size: 30px;
font-weight: 600;
text-decoration: none;
}
.navbar .menu-list {
display: inline-flex;
}
.menu-list li {
list-style: none;
}
.menu-list li a {
color: #fff;
font-size: 18px;
font-weight: 500;
margin-left: 25px;
text-decoration: none;
transition: all 0.3s ease;
}
.menu-list li a:hover {
color: #007bff;
}
.banner {
background: url("banner.jpg") no-repeat;
height: 100vh;
background-size: cover;
background-position: center;
background-attachment: fixed;
}
.about {
padding: 30px 0;
}
.about .title {
font-size: 38px;
font-weight: 700;
}
.about p {
padding-top: 20px;
text-align: justify;
}
.icon {
color: #fff;
font-size: 20px;
cursor: pointer;
display: none;
}
.menu-list .cancel-btn {
position: absolute;
right: 30px;
top: 20px;
}
#media (max-width: 1230px) {
.content {
padding: 0 60px;
}
}
#media (max-width: 1100px) {
.content {
padding: 0 40px;
}
}
#media (max-width: 900px) {
.content {
padding: 0 30px;
}
}
#media (max-width: 868px) {
body.disabled {
overflow: hidden;
}
.icon {
display: block;
}
.icon.hide {
display: none;
}
.navbar .menu-list {
position: fixed;
height: 100vh;
width: 100%;
max-width: 400px;
left: -100%;
top: 0px;
display: block;
padding: 40px 0;
text-align: center;
background: #222;
transition: all 0.3s ease;
}
.navbar.show .menu-list {
left: 0%;
}
.navbar .menu-list li {
margin-top: 45px;
}
.navbar .menu-list li a {
font-size: 23px;
margin-left: -100%;
transition: 0.6s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}
.navbar.show .menu-list li a {
margin-left: 0px;
}
}
#media (max-width: 380px) {
.navbar .logo a {
font-size: 27px;
}
}
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Sticky Navigation Bar | CodingNepal</title>
<link rel="stylesheet" href="style.css">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.3/css/all.min.css" />
</head>
<body>
<nav class="navbar">
<div class="content">
<div class="logo">
CodingNepal
</div>
<ul class="menu-list">
<div class="icon cancel-btn">
<i class="fas fa-times"></i>
</div>
<li>Home</li>
<li>About</li>
<li>Services</li>
<li>Features</li>
<li>Contact</li>
</ul>
<div class="icon menu-btn">
<i class="fas fa-bars"></i>
</div>
</div>
</nav>
<div class="banner"></div>
<div class="about">
<div class="content">
<div class="title">Responsive Sticky Navigation Menu Bar on Scroll using HTML CSS & JavaScript</div>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quo impedit atque consequatur! Iusto distinctio temporibus repellendus labore odit adipisci harum ipsa beatae natus, eum eius, hic aperiam odio! Quasi molestias magnam illo voluptatem iusto
ipsam blanditiis, tempore cumque reiciendis quaerat vero tenetur, sequi dolores libero voluptas vitae voluptate placeat dolorum modi ipsa nisi repellat facilis aliquam asperiores. Aut nam repellat harum quas saepe dolorum voluptates ratione, itaque
consectetur explicabo a facilis rem mollitia maxime repudiandae fuga reprehenderit, odio cum incidunt labore molestiae quis non perferendis ipsam. Illum, in, deserunt. Ipsa.</p>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Impedit hic excepturi nobis id, eos dolor libero, nam assumenda, at culpa quos perspiciatis ratione ea modi! Natus sapiente a, explicabo sit quisquam eligendi esse provident eos enim doloremque
blanditiis aut placeat veniam, libero nostrum quae. Ipsam, iste reprehenderit minima accusantium illo dolorem recusandae, ipsa autem quidem reiciendis a mollitia sit tenetur.</p>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Sint doloremque perspiciatis voluptate ducimus reiciendis rem expedita voluptatibus dicta harum, quo, aspernatur maiores possimus officia quod? Aliquid molestiae illo sequi, tempora perferendis
at incidunt nam porro voluptatibus, iste aperiam blanditiis adipisci ducimus repellendus distinctio nostrum ipsum! Voluptas facilis cum, atque tempora magnam beatae sequi! Doloribus expedita, cupiditate quo quod nemo aliquam, mollitia cum ea nam
ullam soluta temporibus! Repudiandae incidunt consequatur distinctio deleniti obcaecati sit facilis unde, quisquam veniam ad doloribus!</p>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Amet veniam error deleniti cum beatae non assumenda illum est dolores, possimus suscipit quibusdam eveniet id fuga dolore unde modi, sapiente voluptas. Mollitia veritatis explicabo cumque
enim quia voluptates provident totam perferendis excepturi animi assumenda optio minus laudantium eveniet possimus amet blanditiis dolore in fuga atque, earum officia tempora quam similique est.</p>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Itaque ad sunt distinctio quidem incidunt cupiditate sequi deleniti, corrupti officia nam veritatis facilis veniam dolorum enim nisi ipsum dolor rem! Doloribus, eaque odit voluptatem iste
laboriosam provident facere quo. Cum repellat pariatur, error ratione repellendus nisi quam culpa tempora facere in atque nesciunt, magni est aliquid unde soluta optio! Dolore pariatur, quaerat quo in cupiditate deleniti exercitationem. Facilis
suscipit corporis unde aut minima nihil, eum molestias itaque, tenetur, beatae ipsa at!</p>
</div>
</div>
</body>

Navbar won't hide on scroll

I've just included a button on the bottom right of the site to allow users to go back to the top of the page but it seems to have cancelled out my navbar from hiding when the user scrolls. I've been looking at it all morning and would really appreciate a fresh pair of eyes to look at it, any help would be great!
Thanks.
var prevScrollpos = window.pageYOffset;
window.onscroll = function() {
var currentScrollPos = window.pageYOffset;
if (prevScrollpos > currentScrollPos) {
document.getElementById("navigation").style.top = "0";
} else {
document.getElementById("navigation").style.top = "-70px";
}
prevScrollpos = currentScrollPos;
}
window.onscroll = function() {scrollFunction()};
function scrollFunction() {
if (document.body.scrollTop > 20 || document.documentElement.scrollTop > 20) {
document.getElementById("myBtn").style.display = "block";
} else {
document.getElementById("myBtn").style.display = "none";
}
}
function topFunction() {
document.body.scrollTop = 0;
document.documentElement.scrollTop = 0;
}
nav {
z-index: 99;
box-sizing: border-box;
position: fixed;
top: 0;
left: 0;
right: 0;
padding: 20px 60px;
text-align: center;
background-color: white;
font-size: 18px;
letter-spacing: 1px;
transition: top 0.3s;
border-bottom: #f1f1f1 2px solid;
}
nav a:first-child {
float: left;
}
.main-nav {
text-decoration: none;
display: inline-block;
float: right;
text-transform: uppercase;
color: #adb3c1;
padding: 1px 0;
margin: 0 10px;
transition: all 0.15s ease-in-out;
z-index: 10;
}
#navigation a:hover {
color: blue;
transition: 0.5s;
}
.fa-long-arrow-alt-up {
display: none;
position: fixed;
bottom: 20px;
right: 20px;
z-index: 99;
border: none;
outline: none;
background: none;
color: black;
cursor: pointer;
padding: 15px;
font-size: 18px;
}
#myBtn:hover {
color: red;
}
<!DOCTYPE html>
<html>
<head>
<title>Hector's Portfolio</title>
<link rel="stylesheet" type="text/css" href="css/style.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="js/javascript.js"></script>
<link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css" integrity="sha384-fnmOCqbTlWIlj8LyTjo7mOUStjsKC4pOpQbqyi7RrhN7udi9RwhKkMHpvLbHG9Sr" crossorigin="anonymous">
<meta name="viewport" content="width=device-width, initial-scale=1">
</head>
<body class="layout-portfolio">
<nav id="navigation">
<a data-scroll class="main-nav" class="nav-hover" href="#home">Home</a>
<a data-scroll class="main-nav" class="nav-hover" href="#contact">Contact</a>
<a data-scroll class="main-nav" class="nav-hover" href="#about">About</a>
<a data-scroll class="main-nav" class="nav-hover" href="#projects">Projects</a>
</nav>
<!-- Button to go to top -->
<button onclick="topFunction()" id="myBtn" class="fas fa-long-arrow-alt-up"></button>
</body>
</html>

window.onscroll can be set in one exemplary only, when you set it a second time, it replaces the first.
Solution: put all your code in the same function (I added scrollFunction(); to the first, but that can be the contrary):
var prevScrollpos = window.pageYOffset;
window.onscroll = function() {
var currentScrollPos = window.pageYOffset;
if (prevScrollpos > currentScrollPos) {
document.getElementById("navigation").style.top = "0";
} else {
document.getElementById("navigation").style.top = "-70px";
}
prevScrollpos = currentScrollPos;
scrollFunction();
}
function scrollFunction() {
if (document.body.scrollTop > 20 || document.documentElement.scrollTop > 20) {
document.getElementById("myBtn").style.display = "block";
} else {
document.getElementById("myBtn").style.display = "none";
}
}
function topFunction() {
document.body.scrollTop = 0;
document.documentElement.scrollTop = 0;
}
nav {
z-index: 99;
box-sizing: border-box;
position: fixed;
top: 0;
left: 0;
right: 0;
padding: 20px 60px;
text-align: center;
background-color: white;
font-size: 18px;
letter-spacing: 1px;
transition: top 0.3s;
border-bottom: #f1f1f1 2px solid;
}
nav a:first-child {
float: left;
}
.main-nav {
text-decoration: none;
display: inline-block;
float: right;
text-transform: uppercase;
color: #adb3c1;
padding: 1px 0;
margin: 0 10px;
transition: all 0.15s ease-in-out;
z-index: 10;
}
#navigation a:hover {
color: blue;
transition: 0.5s;
}
.fa-long-arrow-alt-up {
display: none;
position: fixed;
bottom: 20px;
right: 20px;
z-index: 99;
border: none;
outline: none;
background: none;
color: black;
cursor: pointer;
padding: 15px;
font-size: 18px;
}
#myBtn:hover {
color: red;
}
<!DOCTYPE html>
<html>
<head>
<title>Hector's Portfolio</title>
<link rel="stylesheet" type="text/css" href="css/style.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="js/javascript.js"></script>
<link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css" integrity="sha384-fnmOCqbTlWIlj8LyTjo7mOUStjsKC4pOpQbqyi7RrhN7udi9RwhKkMHpvLbHG9Sr" crossorigin="anonymous">
<meta name="viewport" content="width=device-width, initial-scale=1">
</head>
<body class="layout-portfolio">
<nav id="navigation">
<a data-scroll class="main-nav" class="nav-hover" href="#home">Home</a>
<a data-scroll class="main-nav" class="nav-hover" href="#contact">Contact</a>
<a data-scroll class="main-nav" class="nav-hover" href="#about">About</a>
<a data-scroll class="main-nav" class="nav-hover" href="#projects">Projects</a>
</nav>
<div style="height: 700px;"></div>
<!-- Button to go to top -->
<button onclick="topFunction()" id="myBtn" class="fas fa-long-arrow-alt-up"></button>
</body>
</html>

The issue here is that the second onscroll overrides the first one.
So, you can move the code to single function. I have updated the code below:
var prevScrollpos = window.pageYOffset;
window.onscroll = function() {scrollFunction()};
function scrollFunction() {
if (document.body.scrollTop > 20 || document.documentElement.scrollTop > 20) {
document.getElementById("myBtn").style.display = "block";
} else {
document.getElementById("myBtn").style.display = "none";
}
var currentScrollPos = window.pageYOffset;
if (prevScrollpos > currentScrollPos) {
document.getElementById("navigation").style.top = "0";
} else {
document.getElementById("navigation").style.top = "-70px";
}
prevScrollpos = currentScrollPos;
}
function topFunction() {
document.body.scrollTop = 0;
document.documentElement.scrollTop = 0;
}
nav {
z-index: 99;
box-sizing: border-box;
position: fixed;
top: 0;
left: 0;
right: 0;
padding: 20px 60px;
text-align: center;
background-color: white;
font-size: 18px;
letter-spacing: 1px;
transition: top 0.3s;
border-bottom: #f1f1f1 2px solid;
}
nav a:first-child {
float: left;
}
.main-nav {
text-decoration: none;
display: inline-block;
float: right;
text-transform: uppercase;
color: #adb3c1;
padding: 1px 0;
margin: 0 10px;
transition: all 0.15s ease-in-out;
z-index: 10;
}
#navigation a:hover {
color: blue;
transition: 0.5s;
}
.fa-long-arrow-alt-up {
display: none;
position: fixed;
bottom: 20px;
right: 20px;
z-index: 99;
border: none;
outline: none;
background: none;
color: black;
cursor: pointer;
padding: 15px;
font-size: 18px;
}
#myBtn:hover {
color: red;
}
<!DOCTYPE html>
<html>
<head>
<title>Hector's Portfolio</title>
<link rel="stylesheet" type="text/css" href="css/style.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="js/javascript.js"></script>
<link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css" integrity="sha384-fnmOCqbTlWIlj8LyTjo7mOUStjsKC4pOpQbqyi7RrhN7udi9RwhKkMHpvLbHG9Sr" crossorigin="anonymous">
<meta name="viewport" content="width=device-width, initial-scale=1">
</head>
<body class="layout-portfolio">
<nav id="navigation">
<a data-scroll class="main-nav" class="nav-hover" href="#home">Home</a>
<a data-scroll class="main-nav" class="nav-hover" href="#contact">Contact</a>
<a data-scroll class="main-nav" class="nav-hover" href="#about">About</a>
<a data-scroll class="main-nav" class="nav-hover" href="#projects">Projects</a>
</nav>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Adipisci amet aperiam consectetur cupiditate deserunt dolore ducimus eius eos et ex explicabo fugit illo impedit inventore laudantium, maiores maxime minus quaerat, quasi rerum soluta tempore vel vitae? Ad, aliquid, consequatur deserunt distinctio expedita fuga labore modi perspiciatis quia ratione sequi sint soluta tempora, voluptates voluptatum. Aperiam consequuntur cumque delectus nulla odit placeat rem saepe sunt. Id labore magnam magni modi molestiae, neque possimus veniam? Blanditiis, commodi delectus dicta enim id incidunt modi nam quas saepe soluta. Aliquid, culpa, deserunt eveniet explicabo harum hic impedit maiores placeat qui quidem, quisquam reiciendis velit voluptatem? A atque consequatur, dolorum magni molestiae repudiandae saepe. Aliquid blanditiis debitis doloremque eum facere magni officiis similique soluta totam ullam! Aliquam amet aspernatur consectetur cumque ducimus et minima quis repellat repudiandae voluptate. Adipisci amet consectetur distinctio, error ex excepturi explicabo iure magnam neque obcaecati officiis quam quibusdam, vel, voluptas?</p>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Adipisci amet aperiam consectetur cupiditate deserunt dolore ducimus eius eos et ex explicabo fugit illo impedit inventore laudantium, maiores maxime minus quaerat, quasi rerum soluta tempore vel vitae? Ad, aliquid, consequatur deserunt distinctio expedita fuga labore modi perspiciatis quia ratione sequi sint soluta tempora, voluptates voluptatum. Aperiam consequuntur cumque delectus nulla odit placeat rem saepe sunt. Id labore magnam magni modi molestiae, neque possimus veniam? Blanditiis, commodi delectus dicta enim id incidunt modi nam quas saepe soluta. Aliquid, culpa, deserunt eveniet explicabo harum hic impedit maiores placeat qui quidem, quisquam reiciendis velit voluptatem? A atque consequatur, dolorum magni molestiae repudiandae saepe. Aliquid blanditiis debitis doloremque eum facere magni officiis similique soluta totam ullam! Aliquam amet aspernatur consectetur cumque ducimus et minima quis repellat repudiandae voluptate. Adipisci amet consectetur distinctio, error ex excepturi explicabo iure magnam neque obcaecati officiis quam quibusdam, vel, voluptas?</p>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Adipisci amet aperiam consectetur cupiditate deserunt dolore ducimus eius eos et ex explicabo fugit illo impedit inventore laudantium, maiores maxime minus quaerat, quasi rerum soluta tempore vel vitae? Ad, aliquid, consequatur deserunt distinctio expedita fuga labore modi perspiciatis quia ratione sequi sint soluta tempora, voluptates voluptatum. Aperiam consequuntur cumque delectus nulla odit placeat rem saepe sunt. Id labore magnam magni modi molestiae, neque possimus veniam? Blanditiis, commodi delectus dicta enim id incidunt modi nam quas saepe soluta. Aliquid, culpa, deserunt eveniet explicabo harum hic impedit maiores placeat qui quidem, quisquam reiciendis velit voluptatem? A atque consequatur, dolorum magni molestiae repudiandae saepe. Aliquid blanditiis debitis doloremque eum facere magni officiis similique soluta totam ullam! Aliquam amet aspernatur consectetur cumque ducimus et minima quis repellat repudiandae voluptate. Adipisci amet consectetur distinctio, error ex excepturi explicabo iure magnam neque obcaecati officiis quam quibusdam, vel, voluptas?</p>
<!-- Button to go to top -->
<button onclick="topFunction()" id="myBtn" class="fas fa-long-arrow-alt-up"></button>
</body>
</html>

Navbar Position remain fixed when scroll back to top

Actually am trying to achieve a sticky nav when scrolled and i use the javascript if...else statement to add a class of .sticky to the #navbar if the onscroll is greater than the #navbar offsetTop, else remove the class of .sticky and i add position: fixed; and width: 100%; and top: 0; to the .sticky, and fortunately these add class of .sticky to #navbar if the scroll is greater than the #navbar offsetTop
MY PROBLEM IS :- When scroll is less than the #navbar offsetTop the .sticky class doesn't remove and the #navbar remain fixed when scroll back to the top, how do i fixed it that my navbar will be back to normal when scroll is less than #navbar offsetTop..
HTML
<header>
<p>FaceMash</p>
<div id="headnotify">
🔔
🔇
📶
📧
</div>
</header>
<div id="navbar">
Home
Explore
Discover
Filter
Docs
More
</div>
<section>
<p>
Lorem ipsum dolor sit amet, consectetur adipisicing elit. Architecto obcaecati exercitationem nam fugiat, ab molestias quo saepe, sed iste doloribus earum, expedita quia nobis quidem quasi aliquid eos ullam! Qui fugiat, dolores quasi velit quae maxime blanditiis id. Aspernatur, omnis laudantium autem voluptate quibusdam dolor, alias tempora nam, blanditiis hic nihil iure saepe recusandae. Harum officia maxime laborum quia explicabo laudantium odit quisquam alias libero natus, voluptas voluptate nisi perspiciatis quam iusto rem atque officiis vitae cumque ad dolore, debitis labore. Natus ea expedita cupiditate, deserunt provident, laboriosam error beatae inventore consequuntur necessitatibus facere. Suscipit quis corrupti alias dolor ex error natus, expedita sed, voluptatibus aliquam quisquam earum voluptate rem animi omnis harum placeat quos unde! Debitis tempora, magni ex, nostrum ipsam consequuntur. Eaque, dolorem, tempore totam minus odio pariatur, veniam ad fugiat, incidunt harum dolorum quibusdam error cumque quae. Ipsam, necessitatibus nesciunt provident. Aliquid aut, dolorum! Dolor earum laborum repellendus at iure maiores quas enim reprehenderit ex ullam sequi possimus autem incidunt, porro vero quibusdam consectetur aspernatur accusamus et consequatur ipsum fugit. Totam officia nesciunt, accusantium sapiente quis placeat voluptatum, itaque repellat ratione. Non quis saepe eaque fugiat aliquam sit. Rerum aspernatur culpa, adipisci illum ea distinctio debitis quasi omnis sequi, natus, nulla. Voluptatum vel, quidem hic, autem dolore modi? Beatae quod sit, neque ex ab, tempore quam vel culpa ea quasi corporis vero, quaerat ipsam necessitatibus rem magnam, earum eius dignissimos ducimus exercitationem eveniet! Consectetur minus vitae, voluptatum suscipit. Voluptatibus esse aut eaque delectus. Consequatur molestias quam voluptatibus, quidem necessitatibus dolorem harum explicabo ut quas, amet magnam voluptatum illum quia laborum in voluptate expedita blanditiis. Sapiente fuga culpa maiores eum eligendi eaque sit explicabo vitae fugiat soluta, rerum vel atque perferendis repellat fugit mollitia ab, adipisci inventore? Quidem tempore commodi hic. Voluptatem nostrum possimus, asperiores minima animi numquam.
</p>
</section>
CSS
body{
margin: 0;
padding: 0;
font-family: arial;
}
#navbar{
display: flex;
height: 50px;
color: #fff;
-ms-align-items: center;
align-items: center;
background-color: gray;
}
#navbar a{
padding: 15px 30px;
color: #fff;
text-decoration: none;
}
#navbar a:hover{
background-color: rgba(0,0,0,.1);
}
header{
height: 100px;
display: flex;
-ms-align-items: center;
align-items: center;
}
header p{
font-size: 1.8em;
color: gray;
margin-left: 30px;
}
header #headnotify{
margin-left: auto;
margin-right: 50px;
display: flex;
}
header #headnotify a{
text-decoration: none;
padding: 10px 25px;
font-size: 1.5em;
}
header #headnotify a:hover{
background-color: #f1f1f1;
}
section{
width: 90%;
border: 1px solid gray;
padding: 30px;
margin: 30px auto ;
}
section p{
font-size: 1.4em;
line-height: 30px;
color: gray;
}
.sticky{
position: fixed;
width: 100%;
top: 0;
}
JAVASCRIPT
<script type="text/javascript">
const navbar = document.getElementById("navbar");
function scrollNav() {
if (window.pageYOffset >= navbar.offsetTop) {
navbar.classList.add('sticky');
}else {
navbar.classList.remove('sticky');
}
}
window.onscroll = function () {
scrollNav();
}
</script>

The issue is that your function constantly recalculates the offset because your event is bound to onscroll. What this means is that when it is set to sticky, the offset becomes unpredictable. You can fix this by pulling out the offsetTop variable outside of the function, so it is calculated only once.
var navbar = document.getElementById("navbar");
var navbarOffset = navbar.offsetTop;
window.onscroll = function () {
window.pageYOffset >= navbarOffset ? navbar.classList.add('sticky') : navbar.classList.remove('sticky')
}

jScrollpane scrollbar not working

Working on a jScrollPane. I've installed on my server exactly as stated through the jScrollPane site. The content seems to scroll but the default window scrollbar is showing up and the styled jScroll Vertical bar and drag bar don't scroll at all.
I've read about some issues with it not scrolling on the latest jquery so I also tried using an older version but still no luck.
I've made a quick fiddle that shows the issue.
Any help would be appreciated. I've been stuck on this for a few days now.
html -
<div id="subpanel" class="nav_dialog displayed" style="height: 560px; left: ; display: block;">
<div class="close_link">
Close (x)
</div>
<div class="scrollpane jspScrollable" id="subpanel_content" style="overflow: hidden; padding: 0px; width: 475px;" tabindex="0">
<div class="jspContainer" style="width: 475px; height: 520px;">
<div class="jspPane" style="padding: 0px 65px 0px 0px; top: 0px; width: 396px;">
<p><img src="http://s2.postimg.org/5uxqi0mgl/cats1.jpg" alt=""></p>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.</p>
<p>-</p>
<p>Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
<p> </p>
<p>Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam, eaque ipsa quae ab illo inventore veritatis et quasi architecto beatae vitae dicta sunt explicabo.</p>
<p> </p>
<p>Nemo enim ipsam voluptatem quia voluptas sit aspernatur aut odit aut fugit, sed quia consequuntur magni dolores eos qui ratione voluptatem sequi nesciunt.</p>
<p>-</p>
<p>Neque porro quisquam est, qui dolorem ipsum quia dolor sit amet, consectetur, adipisci velit, sed quia non numquam eius modi tempora incidunt ut labore et dolore magnam aliquam quaerat voluptatem. </p>
</div>
<div class="jspVerticalBar">
<div class="jspCap jspCapTop"></div>
<div class="jspTrack" style="height: 600px;">
<div class="jspDrag" style="height: 300px; top: 0px;">
<div class="jspDragTop"></div>
<div class="jspDragBottom"></div>
</div>
</div>
<div class="jspCap jspCapBottom"></div>
</div>
</div>
</div>
</div>
CSS -
#subpanel {
position: absolute;
z-index: 10;
}
.nav_dialog {
position: absolute;
font-family: 'Inconsolata',verdana;
display: none;
float: left;
background-color: rgba(255, 255, 255, 0.75) !important;
color: #111 !important;
padding: 10px;
z-index: 10;
width: 495px;
color: white;
min-height: 306px;
font-size: inherit;
line-height: inherit;
margin-top: 2px;
}
.nav_dialog .close_link {
text-align: right;
margin-bottom: 10px;
}
.nav_dialog .scrollpane {
overflow: auto;
min-height: 270px;
margin: 0px 8px 0px 15px;
padding-right: 65px;
width: 410px;
}
.jspContainer
{
overflow: auto;
position: relative;
}
.jspPane
{
position: absolute;
}
.jspVerticalBar
{
position: absolute;
top: 0;
right: 0;
width: 16px;
height: 100%;
background: red;
}
.jspHorizontalBar
{
position: absolute;
bottom: 0;
left: 0;
width: 100%;
height: 16px;
background: red;
}
.jspCap
{
display: none;
}
.jspHorizontalBar .jspCap
{
float: left;
}
.jspTrack
{
background: #dde;
position: relative;
}
.jspDrag
{
background: #bbd;
position: relative;
top: 0;
left: 0;
cursor: pointer;
}
.jspHorizontalBar .jspTrack,
.jspHorizontalBar .jspDrag
{
float: left;
height: 100%;
}
.jspArrow
{
background: #50506d;
text-indent: -20000px;
display: block;
cursor: pointer;
padding: 0;
margin: 0;
}
.jspArrow.jspDisabled
{
cursor: default;
background: #80808d;
}
.jspVerticalBar .jspArrow
{
height: 16px;
}
.jspHorizontalBar .jspArrow
{
width: 16px;
float: left;
height: 100%;
}
.jspVerticalBar .jspArrow:focus
{
outline: none;
}
.jspCorner
{
background: #eeeef4;
float: left;
height: 100%;
}
/* Yuk! CSS Hack for IE6 3 pixel bug :( */
* html .jspCorner
{
margin: 0 -3px 0 0;
}

Let the jscrollpane to generate the class in javascript.
Also, include the jscrollpane library in your document.
<!-- Jscroll pane library -->
<script src="http://jscrollpane.kelvinluck.com/script/jquery.jscrollpane.min.js"></script>
<!-- Mousewheel -->
<script src="http://jscrollpane.kelvinluck.com/script/jquery.mousewheel.js"></script>
<div id="subpanel" class="nav_dialog displayed" style="height: 560px; left: ; display: block;">
<div class="close_link">
Close (x)
</div>
<div class="scroll-pane">
<p><img src="http://s2.postimg.org/5uxqi0mgl/cats1.jpg" alt="">
</p>
<p>
Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
</p>
<p>
-
</p>
<p>
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
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<p>
Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam, eaque ipsa quae ab illo inventore veritatis et quasi architecto beatae vitae dicta sunt explicabo.
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<p>
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<p>
Nemo enim ipsam voluptatem quia voluptas sit aspernatur aut odit aut fugit, sed quia consequuntur magni dolores eos qui ratione voluptatem sequi nesciunt.
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<p>
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<p>
Neque porro quisquam est, qui dolorem ipsum quia dolor sit amet, consectetur, adipisci velit, sed quia non numquam eius modi tempora incidunt ut labore et dolore magnam aliquam quaerat voluptatem.
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</div>
</div>
Give to the element .scroll-pane overflow:hidden and height:300px or the desired height.
I've created fiddle so you can see result
http://jsfiddle.net/8zk4E/1/