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How to add a smooth animation to the progress bar

When I click I want to smoothly add segments to the progress bar. They are added but instantly. What could be the problem?
I tried to implement a smooth animation with setInterval, but nothing comes out. Percentages are also added instantly.
let progressBar = document.querySelector(".progressbar");
let progressBarValue = document.querySelector(".progressbar__value");
const body = document.querySelector("body");
let progressBarStartValue = 0;
let progressBarEndValue = 100;
let speed = 50;
body.addEventListener("click", function(e) {
if (progressBarStartValue === progressBarEndValue) {
alert("you have completed all the tasks");
} else {
let progress = setInterval(() => {
if (progressBarStartValue != 100) {
progressBarStartValue += 10;
clearInterval(progress);
}
progressBarValue.textContent = `${progressBarStartValue}%`;
progressBar.style.background = `conic-gradient(
#FFF ${progressBarStartValue * 3.6}deg,
#262623 ${progressBarStartValue * 3.6}deg
)`;
}, speed);
}
});
.progressbar {
position: relative;
height: 150px;
width: 150px;
background-color: #262623;
border-radius: 50%;
display: flex;
align-items: center;
justify-content: center;
}
.progressbar::before {
content: "";
position: absolute;
height: 80%;
width: 80%;
background-color: #0f0f0f;
border-radius: 50%;
}
.progressbar__value {
color: #fff;
z-index: 9;
font-size: 25px;
font-weight: 600;
}
<main class="main">
<section class="statistic">
<div class="container">
<div class="statistic__inner">
<div class="statistic__text">
<h2 class="statistic__title">You're almost there!</h2>
<p class="statistic__subtitle">keep up the good work</p>
</div>
<div class="progressbar"><span class="progressbar__value">0%</span></div>
</div>
</div>
</section>
</main>

This may not be exactly what you're looking for, but with the conic-gradient() implementation you're using, I'd recommend checking out a library call anime.js.
Here's an example with your implementation (same html and css):
// your.js
let progressBar = document.querySelector(".progressbar");
let progressBarValue = document.querySelector(".progressbar__value");
const body = document.querySelector("body");
// Switched to object for target in anime()
let progressBarObject = {
progressBarStartValue: 0,
progressBarEndValue: 100,
progressBarAnimationValue: 0 * 3.6 // New value needed for smoothing the progress bar, since the progress value needs to be multiplied by 3.6
}
// Not necessary, but I recommend changing the event listener to pointerup for better support
// Also not necessary, I changed function to arrow function for my own preference
body.addEventListener("pointerup", e => {
e.preventDefault()
if (progressBarObject.progressBarStartValue === progressBarObject.progressBarEndValue) {
alert("you have completed all the tasks");
} else {
let newValue = 0 // Needed so we can set the value, before it's applied in anime()
if (progressBarObject.progressBarStartValue != 100) {
// Math.ceil() allows us to round to the nearest 10 to guarantee the correct output
newValue = Math.ceil((progressBarObject.progressBarStartValue + 10) / 10) * 10;
}
// Optional: Prevents accidentally going over 100 somehow
if (newValue > 100) {
newValue = 100
}
anime({
targets: progressBarObject,
progressBarStartValue: newValue,
progressBarAnimationValue: newValue * 3.6,
easing: 'easeInOutExpo',
round: 1, // Rounds to nearest 1 so you don't have 0.3339...% displayed in progressBarValue
update: () => {
progressBar.style.backgroundImage = `conic-gradient(
#FFF ${progressBarObject.progressBarAnimationValue}deg,
#262623 ${progressBarObject.progressBarAnimationValue}deg)`;
progressBarValue.textContent = `${progressBarObject.progressBarStartValue}%`;
},
duration: 500
});
}
});
Here's a CodePen using the anime.js CDN: Circular Progress Bar Smoothing
If you don't want to use a javascript library, then I'd recommend switching from the conic-gradient() to something else. I hear using an .svg circle with stroke and stroke-dasharray can work great with CSS transition.

You shouldn't setInterval your progress variable like this. instead, put it as a global variable outside the function then use it to gradually add 1 as long as the start value is less than progress, and you still can control the speed with your speed variable.
let progressBar = document.querySelector(".progressbar");
let progressBarValue = document.querySelector(".progressbar__value");
const body = document.querySelector("body");
let progressBarStartValue = 0;
let progressBarEndValue = 100;
let speed = 50;
let progress = 0;
body.addEventListener("click", function(e) {
if (progressBarStartValue === progressBarEndValue) {
alert("you have completed all the tasks");
} else {
progress += 10;
setInterval(() => {
if (progressBarStartValue < progress) {
progressBarStartValue += 1;
clearInterval();
}
progressBarValue.textContent = `${progressBarStartValue}%`;
progressBar.style.background = `conic-gradient(
#FFF ${progressBarStartValue * 3.6}deg,
#262623 ${progressBarStartValue * 3.6}deg
)`;
}, speed);
}
});
.progressbar {
position: relative;
height: 150px;
width: 150px;
background-color: #262623;
border-radius: 50%;
display: flex;
align-items: center;
justify-content: center;
border: 3px solid red;
}
.progressbar::before {
content: "";
position: absolute;
height: 80%;
width: 80%;
background-color: #0f0f0f;
border-radius: 50%;
border: 3px solid blue;
}
.progressbar__value {
color: #fff;
z-index: 9;
font-size: 25px;
font-weight: 600;
}
<main class="main">
<section class="statistic">
<div class="container">
<div class="statistic__inner">
<div class="statistic__text">
<h2 class="statistic__title">You're almost there!</h2>
<p class="statistic__subtitle">keep up the good work</p>
</div>
<div class="progressbar"><span class="progressbar__value">0%</span></div>
</div>
</div>
</section>
</main>

Add and remove classes from Node in Javascript

I have a slider in my page and slider's indicators are dynamic, It bases on slider's elements' number and width of body.
My code block is:
function setIndicators(){
const indicator = document.createElement("div");
indicator.className = "indicator active";
indicatorContainer.innerHTML = "";
for(let i = 0;i <= maxIndex; i++){
indicatorContainer.appendChild(indicator.cloneNode(true));
}
updateIndicators();
}
which is working fine. But I want to show active indicator but I cannot manipulate elements' classes.
I tried this:
function updateIndicators(index) {
indicators.forEach((indicator) => {
indicator.classList.remove("active");
});
let newActiveIndicator = indicators[index];
newActiveIndicator.classList.add("active");
}
And I am not able to reach every indicators using index or anything I know/find. Also, it seems like NodeList not a HTML element.
Other things you may need:
const indicatorContainer = document.querySelector(".container-indicators");
const indicators = document.querySelectorAll(".indicator");
let maxScrollX = slider.scrollWidth - body.offsetWidth;
let baseSliderWidth = slider.offsetWidth;
let maxIndex = Math.ceil(maxScrollX / baseSliderWidth);

A better one I would suggest using the indicators in a different way. Since your HTML isn't shared, I have to assume a few things:
function clearAll() {
const activeOnes = document.querySelectorAll(".active");
activeOnes.forEach(function(activeOne) {
activeOne.classList.remove("active");
});
}
function chooseOne(index) {
clearAll();
const indicators = document.querySelectorAll(".indicator");
indicators[index].classList.add("active");
}
* {
font-family: 'Operator Mono', consolas, monospace;
}
.indicators {
border: 2px solid #ccc;
display: inline-block;
width: auto;
margin: 15px;
}
.indicators .indicator {
padding: 15px;
line-height: 1;
background-color: #fff;
flex-grow: 1;
text-align: center;
display: inline-block;
}
.indicator.active {
background-color: #f90;
}
<div class="indicators"><div class="indicator">I1</div><div class="indicator">I2</div><div class="indicator">I3</div><div class="indicator">I4</div><div class="indicator">I5</div></div>
<button onclick="chooseOne(2); return false">Select I3</button>
<button onclick="chooseOne(3); return false">Select I4</button>
I would have done this differently this way.
Preview

How to write a simple marquee effect with javascript

I need everyone's help. I currently need to implement a marquee effect. The yellow box needs to be scrolled up to show the name. Every time I scroll, I have to stay in the middle of the box for 1 second before continuing to scroll. I can find such an example on the Internet. , but the logic of this program is a bit difficult for me to understand for urban beginners. I wonder if anyone would like to provide a simpler and easier-to-understand writing method if I want to achieve this marquee effect?
​​Sorry, I am a beginner in the program, the current logic More complex programs are more difficult to understand.
function slideLine(box, stf, delay, speed, h) {
var slideBox = document.getElementById(box);
var delay = delay || 1000,
speed = speed || 20,
h = h || 40;
var tid = null,
pause = false;
var s = function() {
tid = setInterval(slide, speed);
};
var slide = function() {
if (pause) return;
slideBox.scrollTop += 1;
if (slideBox.scrollTop % h == 0) {
clearInterval(tid);
slideBox.appendChild(slideBox.getElementsByTagName(stf)[0]);
slideBox.scrollTop = 0;
setTimeout(s, delay);
}
};
setTimeout(s, delay);
}
slideLine("kanban_info", "p", 1000, 25, 40);
.kanban {
position: absolute;
margin: 0 auto;
width: 278px;
height: 50px;
background-color: yellow;
left: 50%;
transform: translate(-50%);
text-align: center;
line-height: 6;
}
.kanban .kenban_wrap {
height: 38px;
transform: translateY(28px);
overflow: hidden;
}
.kanban .kenban_wrap .kanban_info {
line-height: 38px;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="kanban">
<div class="kenban_wrap" id='kanban_info'>
<p class="kanban_info">Allen</p>
<p class="kanban_info">james</p>
<p class="kanban_info">jack</p>
</div>
</div>

By combining scroll-behavior with anchor tags that are programmatically clicked you can simplify it. This should be easier to understand and you can go from there, even if it might not be the best solution.
let links = document.querySelectorAll("a"); // List of links
let div = document.querySelector("div");
let index = 0;
let t = 2000; // setTimeout duration
// Change Scroll behavior to prevent the animation from the last to first list item
function scrollBeh() {
if(index == 1) {
div.style.scrollBehavior = "auto";
t = 0; // Timeout duration to 0 to prevent `1` being shown longer than other list items
} else {
div.style.scrollBehavior = "smooth";
t = 2000;
}
}
// Loop through list items
function resetInd() {
if(index < 3) {
index++;
} else {
index = 0;
}
}
function clickLinks() {
links[index].click();
resetInd();
scrollBeh();
setTimeout(clickLinks, t);
}
setTimeout(clickLinks, t);
div {
width: 200px;
height: 100px;
background-color: darkblue;
overflow: hidden;
scroll-behavior: smooth;
}
li {
height: 100px;
list-style: none;
}
a {
text-decoration: none;
color: #FFF;
font-size: 50px;
}
<div>
<ul>
<li id="one">1</li>
<li id="two">2</li>
<li id="three">3</li>
<li id="one_loop">1</li>
</ul>
</div>

How can I get and set style properties of an object that come from a class?

I have a simple animation function that simulates a button being pushed, by varying the width:
function bPress(b) {
var w = (parseFloat(b.style.width)*0.96);
if (b.style.width.substr(-1)=="%") {
var s ="%";
}
else {
var s = "em";
}
b.style.width = w +s;
b.onmouseup = function () {
w = (parseFloat(b.style.width)/0.96);
b.style.width = w+s;
// etc.
}
This was working well until I started cleaning up my code and changed inline CSS style declarations to classes. I previously had, for example:
<div style= 'height: 1.5em; width: 100%; margin: 0 auto; margin-top: 0.2em; font: inherit; font-weight:bold' onclick='checkSave("continue")' onmousedown='bPress(this)'>Continue</div>
I moved the CSS parts to a new class:
.response_button {
height: 1.5em;
width: 100%;
margin: 0 auto;
margin-top: 0.2em;
font: inherit;
font-weight:bold
}
... avoiding repetition and of course simplifying the div tags.
But the animations stopped working. After some experimenting, I eventually came up with a temporary solution by moving the width back into an inline style declaration. But this seems wrong.
So 2 questions:
Why does this.style.width not work if the width is declared inside a class?
Is there a way to get and set a div's properties if they are declared inside a class?
Edit: For completeness, using nick zoum's answer, here is the modified bPress function:
function bPress(b) {
var w_px = window.getComputedStyle(b).width;
var w_int = (parseInt(w_px));
b.style.width = Math.round(w_int * 0.96) + "px";
b.onmouseup = function () {
b.style.width = w_px;
}
}

You can use getComputedStyle to get all of the calculated style properties of an element.
var dom = document.querySelector("#foo");
console.log(getComputedStyle(dom).backgroundColor);
#foo {
background-color: red;
width: 10px;
height: 10px;
}
<div id="foo"></div>

Change background color of a div on hover from an array of colors

I am new to jQuery and I am experimenting a bit here. Please be patient.
I am trying to give div's a "random" background color on hover. If the div is not hovered I want them to be white.
I realize that random may not be the right word here because I want the script to chose a color from the following array, preferably in the same order: ['#009c61', '#cc0099', '#cc9900', '#cc0033', '#0099cc', '#6600cc', '#66cc00']
I guess some of the problem is because all divs have the same class.
How can this be achieved with jQuery?
jQuery(document).ready(function($) {
var bgColorArray = ['#009c61', '#cc0099', '#cc9900', '#cc0033', '#0099cc', '#6600cc', '#66cc00'],
selectBG = bgColorArray[Math.floor(Math.random() * bgColorArray.length)];
$('.article-container').css('background-color', selectBG)
});
.article-container {
color: #000;
font-family: 'Oswald', sans-serif;
text-align: center;
height: 200px;
width: 200px;
border: solid 3px #000;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="article-container">Div 1</div>
<div class="article-container">Div 2</div>
<div class="article-container">Div 3</div>
<div class="article-container">Div 4</div>
So far I have tried this:
jQuery(document).ready(function($) {
var bgColorArray = ['#009c61', '#cc0099', '#cc9900', '#cc0033', '#0099cc', '#6600cc', '#66cc00'],
selectBG = bgColorArray[Math.floor(Math.random() * bgColorArray.length)];
$('.article-container').css('background-color', selectBG)
});
Problem is this changes the color on page refresh and it changes the bg color of all divs.

Try to use .hover(mouseInHandler,mouseOutHandler) function at this context,
var colors = ['#009c61', '#cc0099', '#cc9900', '#cc0033', '#0099cc', '#6600cc', '#66cc00'];
$(".article-container").hover(function() {
$(this).css("background-color", colors[(Math.random() * colors.length) | 0])
}, function() {
$(this).css("background-color", "")
});
DEMO

Take a look at this
Jquery :
$(document).ready(function()
{
$("a").hover(function(e)
{
var randomClass = getRandomClass();
$(e.target).attr("class", randomClass);
});
});
function getRandomClass()
{
//Store available css classes
var classes = new Array("green", "purple", "teal", "violet", "pink");
//Give a random number from 0 to 5
var randomNumber = Math.floor(Math.random()*6);
return classes[randomNumber];
}
CSS :
a.green:hover { color: #1ace84; }
a.purple:hover { color: #a262c0; }
a.teal:hover { color: #4ac0aa; }
a.violet:hover { color: #8c78ba; }
a.pink:hover { color: #d529cd; }
Searched on google and got it from Telmo

Cool idea. I just wanted to take a stab at making something pretty.
var numberOfBlocks= 250;
var colors = ['#009c61','#cc0099','#cc9900','#cc0033','#0099cc','#6600cc','#66cc00'];
var lastColor = 0;
(function init() {
var wrap = document.getElementById('wrap');
var block = document.createElement('div');
block.setAttribute('class', 'block');
for(var i=0; i<numberOfBlocks; i++) {
wrap.appendChild(block.cloneNode(true));
}
$('.block').hover(function() {
$(this).css('background-color', colors[lastColor++])
lastColor = (lastColor>=colors.length?0:lastColor);
},
function() {
$(this).css('background-color', '#fff');
});
})();
.block {
width: 20px;
height: 20px;
border: 1px solid white;
display: inline-block;
margin-top: -5px;
margin-left: -1px;
transition: all .1s ease-in-out;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="wrap">
</div>