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Add and Remove Class of Tab Onscroll (If else Tab JavaScript)

I want to use scroll to add and remove a class of Tabs
When I scroll down the page, then all tab switch to active. Then, when I scroll up the page, the all tab switched to inactive.
In the current condition, when I scroll down the page, it removes the current tab class, and when I scroll up the page, it adds the active class to the first tab. But, it's not what I want. I want it when I scroll down it moves to the next tab, when I scroll up it moves to the previous tab. I think I should use the if else tab.
//Add & remove class tab, contents, & menu on click
window.addEventListener('DOMContentLoaded', ()=> {
let tabs = document.querySelectorAll('.tab');
let content = document.querySelectorAll('.content-item');
let firstTab = function(tabs) {tabs.classList.add('tab-active')};
let firstContent = function(content) {content.classList.add('content-active')};
firstTab(tabs[0]); //Already remove the ready and callback
firstContent(content[0]);
for (let i = 0; i < tabs.length; i++) {
tabs[i].addEventListener('click', () => tabClick(i));
}
for (let i = 0; i < tabs.length; i++) {
window.addEventListener('scroll', () => tabScroll(i)); //Already remove the multiple scroll listeners in a loop. But, idk whether it's right or not
}
function tabClick(currentTab) {
//Remove Active Class
let prevt = document.querySelectorAll('.tab-active')[0];
let prevc = document.querySelectorAll('.content-active')[0];
prevc.classList.remove('content-active');
prevc.classList.add('content-show');
prevc.querySelector('iframe').removeAttribute('src');
setTimeout(function() {
prevc.classList.remove('content-show');
},1500);
prevt.classList.remove('tab-active');
//Add Active Class
const iframe = content[currentTab].querySelector('iframe');
tabs[currentTab].classList.add('tab-active');
content[currentTab].classList.add('content-active');
iframe.setAttribute('src', iframe.getAttribute('data-src'));
}
function tabScroll(currentTab) {
if(document.documentElement.scrollTop > 0) {
let prevt = document.querySelectorAll('.tab-active')[0];
let prevc = document.querySelectorAll('.content-active')[0];
prevc.classList.remove('content-active');
prevc.classList.add('content-show');
prevc.querySelector('iframe').removeAttribute('src');
setTimeout(function() {
prevc.classList.remove('content-show');
},1500);
prevt.classList.remove('tab-active');
//Add Active Class
const iframe = content[currentTab].querySelector('iframe');
tabs[currentTab].classList.add('tab-active');
content[currentTab].classList.add('content-active');
iframe.setAttribute('src', iframe.getAttribute('data-src'));
}
}
})
.container {
width: 100vw;
height: 400px;
}
.tabs {
display: flex;
height: 65px;
overflow: hidden;
align-items: center;
justify-content: center;
width: 100%;
}
.tab {
font-size: 16px;
padding: 5px 10px;
cursor: pointer;
}
.tab-active {
background-color: rgb(250, 97, 9);
}
.content {
width: 100%;
margin-top: 5px;
height: calc(100% - 65px);
}
.content-item {
width: 100%;
height: 100%;
display: none;
padding: 0px;
border: none;
position: absolute;
}
.content-wrapper1 {
width: 100%;
height: 100%;
}
.content-wrapper2 {
width: 100%;
height: 100%;
}
.content-wrapper3 {
width: 100%;
height: 100%;
}
.content-iframe {
height: 100%;
width: 100%;
}
.content-show {
display: flex;
animation-name: fade-out;
animation-duration: 2.5s;
}
#keyframes fade-out {
0% {
opacity: 1;
display: flex;
}
99% {
opacity: 0;
display: flex;
}
100% {
opacity: 0;
display: none;
}
}
.content-active {
display: flex;
border: none;
justify-content: center;
height: 100%;
animation-name: fade-in;
animation-duration: 2.5s;
}
#keyframes fade-in {
0% {
display: none;
opacity: 0;
}
1% {
display: block;
opacity: 0.01;
}
100%{
display: block;
opacity: 1;
}
}
.content-iframe {
border: none;
padding: 0px;
margin: 0px;
width: 100vw;
height: 50vh;
}
<div class="container">
<div class="tabs">
<div class="tab">Tokyo</div>
<div class="tab">Paris</div>
<div class="tab">Washington</div>
<div class="tab">Jakarta</div>
<div class="tab">London</div>
</div>
<div class="content">
<div class="content-item">
<div class="content-wrapper1">
<div class="content-wrapper2">
<div class="content-wrapper3">
<iframe class= "content-iframe" data-src="https://en.wikipedia.org/wiki/Tokyo" src="https://en.wikipedia.org/wiki/Tokyo" loading="lazy"></iframe>
</div>
</div>
</div>
</div>
<div class="content-item">
<div class="content-wrapper1">
<div class="content-wrapper2">
<div class="content-wrapper3">
<iframe class= "content-iframe" data-src="https://en.wikipedia.org/wiki/Paris" loading="lazy"></iframe>
</div>
</div>
</div>
</div>
<div class="content-item">
<div class="content-wrapper1">
<div class="content-wrapper2">
<div class="content-wrapper3">
<iframe class= "content-iframe" data-src="https://en.wikipedia.org/wiki/Washington" loading="lazy"></iframe>
</div>
</div>
</div>
</div>
<div class="content-item">
<div class="content-wrapper1">
<div class="content-wrapper2">
<div class="content-wrapper3">
<iframe class= "content-iframe" data-src="https://en.wikipedia.org/wiki/Jakarta" loading="lazy"></iframe>
</div>
</div>
</div>
</div>
<div class="content-item">
<div class="content-wrapper1">
<div class="content-wrapper2">
<div class="content-wrapper3">
<iframe class= "content-iframe" data-src="https://en.wikipedia.org/wiki/London" loading="lazy"></iframe>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
Please help me to solve this guys. Thank you so much..

How to add class in sequence based on button click?

I only found examples using jQuery, but I would like to know how to add and remove classes in sequence, according to the button click, using Vanilla JS. I tried using forEach but I was only able to add all the classes at once.
document.querySelector('#addBtn').addEventListener('click', () => {
document.querySelectorAll('.dot').forEach(e => {
e.classList.add('active')
})
})
document.querySelector('#removeBtn').addEventListener('click', () => {
document.querySelectorAll('.dot').forEach(e => {
e.classList.remove('active')
})
})
.dots{
position: relative;
display: flex;
justify-content: space-around;
width: 100%;
height: 10px;
margin-bottom: 40px;
}
.dot{
position: relative;
height: 10px;
width: 100%;
background-color: grey;
margin: 5px;
}
.dot.active{
background-color: red;
}
<button type="button" id="removeBtn">Remove</button>
<button type="button" id="addBtn">Add</button>
<div class="dots">
<div class="dot active"></div>
<div class="dot"></div>
<div class="dot"></div>
<div class="dot"></div>
<div class="dot"></div>
</div>

You can check the below logic with querySelectorAll for finding the last active elements and using nextElementSibling to apply the change
document.querySelector('#addBtn').addEventListener('click', () => {
const activeElements = document.querySelectorAll('.dot.active')
//no active elments
if (!activeElements || !activeElements.length) {
//set active class for the first found element
const firstElement = document.querySelector('.dot')
if (firstElement) {
firstElement.classList.add('active')
return
}
}
//finding the last active element
const lastElement = activeElements[activeElements.length - 1];
//apply the class the next element of the current active element
const nextElement = lastElement.nextElementSibling
if (nextElement) {
nextElement.classList.add('active')
}
})
document.querySelector('#removeBtn').addEventListener('click', () => {
const activeElements = document.querySelectorAll('.dot.active')
//finding the last active element
const lastElement = activeElements[activeElements.length - 1];
if (lastElement) {
//remove the active class from the last active element
lastElement.classList.remove('active')
}
})
.dots {
position: relative;
display: flex;
justify-content: space-around;
width: 100%;
height: 10px;
margin-bottom: 40px;
}
.dot {
position: relative;
height: 10px;
width: 100%;
background-color: grey;
margin: 5px;
}
.dot.active {
background-color: red;
}
<button type="button" id="removeBtn">Remove</button>
<button type="button" id="addBtn">Add</button>
<div class="dots">
<div class="dot active"></div>
<div class="dot"></div>
<div class="dot"></div>
<div class="dot"></div>
<div class="dot"></div>
</div>

You can break out of the loop once a dot has had active added/removed.
document.querySelector('#addBtn').addEventListener('click', () => {
const dots = document.querySelectorAll('.dot');
for (let dot of dots) {
if (![...dot.classList].includes('active')) {
dot.classList.add('active');
break;
}
}
});
document.querySelector('#removeBtn').addEventListener('click', () => {
const dots = document.querySelectorAll('.dot');
for (let dot of [...dots].reverse()) {
if ([...dot.classList].includes('active')) {
dot.classList.remove('active');
break;
}
}
});
.dots{
position: relative;
display: flex;
justify-content: space-around;
width: 100%;
height: 10px;
margin-bottom: 40px;
}
.dot{
position: relative;
height: 10px;
width: 100%;
background-color: grey;
margin: 5px;
}
.dot.active{
background-color: red;
}
<button type="button" id="removeBtn">Remove</button>
<button type="button" id="addBtn">Add</button>
<div class="dots">
<div class="dot active"></div>
<div class="dot"></div>
<div class="dot"></div>
<div class="dot"></div>
<div class="dot"></div>
</div>

Please check answer below. Explanation is in comments.
document.querySelector('#addBtn').addEventListener('click', () => {
// Get active elements
let activeEl = document.querySelectorAll('.dot.active');
let nextActiveEl;
// If we found active element then find the next sibling else select the first element
if (activeEl.length > 0) {
nextActiveEl = activeEl[activeEl.length - 1].nextElementSibling
} else {
nextActiveEl = document.querySelectorAll('.dot')[0];
}
// If selected element is not null then add class active
if (nextActiveEl)
nextActiveEl.classList.add('active');
})
document.querySelector('#removeBtn').addEventListener('click', () => {
// Get active elements
let activeEl = document.querySelectorAll('.dot.active');
// If we found active element then remove active class of last active element
if (activeEl.length > 0) {
activeEl[activeEl.length - 1].classList.remove('active');
}
})
.dots {
position: relative;
display: flex;
justify-content: space-around;
width: 100%;
height: 10px;
margin-bottom: 40px;
}
.dot {
position: relative;
height: 10px;
width: 100%;
background-color: grey;
margin: 5px;
}
.dot.active {
background-color: red;
}
<button type="button" id="removeBtn">Remove</button>
<button type="button" id="addBtn">Add</button>
<div class="dots">
<div class="dot active"></div>
<div class="dot"></div>
<div class="dot"></div>
<div class="dot"></div>
<div class="dot"></div>
</div>

Infinite carousel with indicator and smooth transition

I'm struggling with infinite carousel below:
let $carousel = document.querySelector('.carousel');
let $ref_ribbon = document.querySelector('.carousel__ribbon');
let $ref_right = document.querySelector('.carousel__button--right');
let $ref_left = document.querySelector('.carousel__button--left');
let $ref_counter = 0;
let $direction;
const transfer = () => {
if ($direction === -1) {
$ref_ribbon.appendChild($ref_ribbon.firstElementChild);
} else if ($direction === 1) {
$ref_ribbon.prepend($ref_ribbon.lastElementChild);
}
$ref_ribbon.style.transition = "none";
$ref_ribbon.style.transform = "translateX(0px)";
setTimeout(function() {
$ref_ribbon.style.transition = "transform .7s ease-in-out";
})
}
const right_button = () => {
if ($direction === 1) {
$ref_ribbon.prepend($ref_ribbon.lastElementChild);
$direction = -1;
}
$direction = -1;
$carousel.style.justifyContent = 'flex-start';
$ref_ribbon.style.transform = `translateX(-${300}px)`;
}
const left_button = () => {
$ref_counter--;
if ($direction === -1) {
$ref_ribbon.appendChild($ref_ribbon.firstElementChild);
$direction = 1;
}
$direction = 1;
$carousel.style.justifyContent = 'flex-end';
$ref_ribbon.style.transform = `translateX(${300}px)`;
}
$ref_right.addEventListener('click', right_button);
$ref_left.addEventListener('click', left_button);
$ref_ribbon.addEventListener('transitionend', transfer)
.carousel {
display: flex;
margin: auto;
position: relative;
height: 200px;
width: 300px;
background-color: red;
justify-content: flex-start;
}
.carousel__button {
position: absolute;
top: 50%;
transform: translateY(-50%);
cursor: pointer;
z-index: 100;
}
.carousel__button--left {
left: 0;
}
.carousel__button--right {
right: 0;
}
.carousel__ribbon {
display: flex;
flex-direction: row;
outline: 3px solid black;
height: 100%;
transition: transform .7s ease-in-out;
}
.carousel__pane {
display: flex;
background-color: skyblue;
height: 100%;
width: 300px;
flex-shrink: 0;
outline: 1px dashed navy;
}
.carousel__content {
text-align: center;
margin: auto;
}
.carousel__indicator {
display: flex;
gap: 10px;
left: 50%;
transform: translateX(-50%);
height: 30px;
position: absolute;
bottom: 0;
}
.carousel__circle {
height: 10px;
width: 10px;
background-color: gray;
border-radius: 50%;
cursor: pointer;
}
.carousel__circle--active {
background-color: black;
}
<div class="carousel">
<button class="carousel__button carousel__button--left"><</button>
<button class="carousel__button carousel__button--right">></button>
<div class="carousel__ribbon">
<div class="carousel__pane">
<p class="carousel__content">Pane 1</p>
</div>
<div class="carousel__pane">
<p class="carousel__content">Pane 2</p>
</div>
<div class="carousel__pane">
<p class="carousel__content">Pane 3</p>
</div>
<div class="carousel__pane">
<p class="carousel__content">Pane 4</p>
</div>
<div class="carousel__pane">
<p class="carousel__content">Pane 5</p>
</div>
</div>
<div class="carousel__indicator">
<div class="carousel__circle carousel__circle--active"></div>
<div class="carousel__circle"></div>
<div class="carousel__circle"></div>
<div class="carousel__circle"></div>
<div class="carousel__circle"></div>
</div>
</div>
I would like to connect indicator so when somebody click on proper circle then carousel will automatically slide to this particular panel. Also, I would like to set this circles that they will show which panel is currently active.
In addition, I would like to get such effect that carousel will jump to this particular panel immediately, ommiting other panels between.
So, if active one is first panel and I click fifth circle, then carousel will smoothly change panel like to the panel number two, but instead of number two I will see number five.
Sadly I always fail to get this effect. I would appriciate if somebody more experienced direct me how to deal with this problem.

Update mouse position on scroll

I came across this website's work page and would like to recreate the xray effect of each of the card element.
Here's my code for the xray effect: https://codepen.io/carljustineoyales/pen/yLMEVYd
HTML
<section class="banner">
<h1>this is a banner page</h1>
</section>
<section class="projects" id="projects">
<div class="cardlist" >
<div class="cardlist__grid" >
<div class="card" id="card" onmouseover="setSize()" onmouseout="resetSize()">
<div class="card__category">
category
</div>
<div class="card__thumbnail">
</div>
<div class="card__info">
<div class="card__title">title</div>
<div class="card__date">date</div>
</div>
</div>
<div class="card" id="card">
<div class="card__category">
category
</div>
<div class="card__thumbnail">
</div>
<div class="card__info">
<div class="card__title">title</div>
<div class="card__date">date</div>
</div>
</div>
</div>
</div>
<div class="cardlist--skeleton" id="skeleton">
<div class="cardlist--skeleton--bg"></div>
<div class="cardlist__grid">
<div class="card">
<div class="card__category">
category
</div>
<div class="card__thumbnail card__thumbnail--black">
</div>
<div class="card__info">
<div class="card__title">title</div>
<div class="card__date">date</div>
</div>
</div>
<div class="card">
<div class="card__category">
category
</div>
<div class="card__thumbnail card__thumbnail--black">
</div>
<div class="card__info">
<div class="card__title">title</div>
<div class="card__date">date</div>
</div>
</div>
</div>
</div>
</section>
</body>
SCSS
* {
margin: 0;
padding: 0;
}
.banner {
height: 100vh;
}
.projects {
max-width: 1440px;
width: 100%;
margin: 100px auto;
// padding: 100px 0;
position: relative;
}
.cardlist {
width: 100%;
color: #000;
&__grid {
display: flex;
flex-direction: row;
justify-content: space-between;
}
&--skeleton {
--x: 0;
--y: 0;
--size: 0px;
clip-path: circle(var(--size) at var(--x) var(--y));
user-select: none;
pointer-events: none;
// clip-path: circle(100px at 0 0);
// clip-path: circle(300px at 0% 0%);
transition: clip-path 0.1s ease;
&--bg {
position: fixed;
top: 0;
right: 0;
bottom: 0;
left: 0;
background-color: #838383;
z-index: -1;
}
width: 100%;
position: absolute;
top: 0;
left: 0;
color: #fff;
z-index: 1;
background-color: #838383;
}
}
.card {
padding: 50px;
&__thumbnail {
width: 500px;
height: 644px;
background-color: #838383;
&--black {
background-color: #000;
}
}
}
JS
let mouseX=0
let mouseY=0
let size = 0;
const projects = document.querySelector('#projects');
function setSize() {
size = 200
skeleton.style.setProperty('--size', size + "px");
}
function resetSize() {
size = 0
skeleton.style.setProperty('--size', size + "px");
}
function updateCoordinates(event) {
mouseX = event.pageX - projects.offsetLeft ;
mouseY = event.pageY - projects.offsetTop ;
skeleton.style.setProperty('--x', mouseX + "px");
skeleton.style.setProperty('--y', mouseY+ "px");
}
The problem is that I can't seem to find a solution for the updating cursor position while scrolling, also the hover animation became laggy when you open the console. Is there a way to update the cursor position on scroll and why the animation became laggy when the console is open.

Pause jQuery On Hover

I just want the ability to be able to pause the animation on mouse hover. I trying to looking good way to do that, but there was some issues. I tested some hover/stop functions, but I can't get these working correctly.
jQuery(document).ready(function() {
setInterval(function() {
jQuery('#testimonials .slide').filter(':visible').fadeOut(1000, function() {
if (jQuery(this).next('.slide').size()) {
jQuery(this).next().fadeIn(1000);
} else {
jQuery('#testimonials .slide').eq(0).fadeIn(1000);
}
});
}, 5000);
});
#quote {
width: 100%;
height: 130px;
background-position: center bottom;
background-repeat: no-repeat;
margin-bottom: 65px;
overflow: hidden;
}
#testimonials .slide {
color: #555555;
}
#testimonials .testimonial-quote {
display: inline;
width: 600px;
height: 170px;
margin: 0;
padding: 0;
float: left;
position: relative;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="quote">
<div id="testimonials">
<div class="slide">
<div class="testimonial-quote">
<p>Text 1</p>
<h4 class="title">Title 1</h4>
</div>
</div>
</div>
</div>

You can achieve this by calling clearInterval() when the slide is hovered, then re-creating the interval again when the mouse leaves the slide, something like this:
jQuery(document).ready(function($) {
var $slides = $('#testimonials .slide');
function beginSlideInterval() {
return setInterval(function() {
$slides.filter(':visible').fadeOut(1000, function() {
var $next = $(this).next().length ? $(this).next() : $slides.first();
$next.fadeIn(1000);
});
}, 3000);
}
var slideInterval = beginSlideInterval();
$slides.on('mouseenter', function() {
clearInterval(slideInterval);
}).on('mouseleave', function() {
slideInterval = beginSlideInterval();
});
});
#quote {
width: 100%;
height: 130px;
background-position: center bottom;
background-repeat: no-repeat;
margin-bottom: 65px;
overflow: hidden;
}
#testimonials .slide {
color: #555555;
}
#testimonials .testimonial-quote {
display: inline;
width: 600px;
height: 170px;
margin: 0;
padding: 0;
float: left;
position: relative;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="quote">
<div id="testimonials">
<div class="slide">
<div class="testimonial-quote">
<p>Text 1</p>
<h4 class="title">Title 1</h4>
</div>
</div>
</div>
</div>
Note that I shortened the interval to make the effect more obvious.