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Window.matchMedia in JavaScript not functioning

I have an HTML, CSS and JavaScript files. The HTML contains three quotes which shuffles every two seconds. I have written the JavaScript code to show these quotes only when the screen width is at most 600px. The problem is that the quote continues to display across every screen width. I've tried using the media query in CSS, but to no avail. What might be the issue? Please, see code below.
HTML Code:
<div class="preNavBar">
<div class="quoteWrapper">
<span class="quote">The roots of education are bitter, but the fruit is sweet. </span>
<span class="quoteAuthor">— Aristotle</span>
</div>
<div class="quoteWrapper">
<span class="quote">To teach is to learn twice. </span>
<span class="quoteAuthor">— Unknown</span>
</div>
<div class="quoteWrapper">
<span class="quote">A person who won't read has no advantage over one who can't read. </span>
<span class="quoteAuthor">— Mark Twain</span>
</div>
</div>
CSS Code:
body {
padding: 0 !important;
margin: 0 !important;
font-size: 16pxm;
background: rgb(53, 54, 58);
}
* {
box-sizing: border-box;
/* margin: 0; */
padding: 0;
}
/* PRE-NAVIGATION BAR */
.preNavBar {
background-color: navy;
color: white;
padding: 10px 30px;
display: grid;
justify-content: center;
}
.preNavBar .quoteAuthor {
font-weight: bolder;
float: right;
}
#media only screen and (min-width: 768px) {
/* .preNavBar .quoteWrapper{
display: none;
} */
}
JavaScript Code:
<script>
let x = window.matchMedia("(max-width: 600px)");
if (x.matches) {
showQuote();
function showQuote() {
let slides = document.getElementsByClassName("quoteWrapper");
let i;
for (i = 0; i < slides.length; i++) {
slides[i].style.display = "none";
}
let min = 0;
let max = slides.length - 1;
let randNum = Math.floor(Math.random() * (max - min + 1)) + min;
slides[randNum].style.display = "block";
setTimeout(showQuote, 2000); // change every 2 seconds
}
}
</script>

Let's take a look at the very first line:
let x = window.matchMedia("(max-width: 800px)");
You invoke window.matchMedia and store returned value in x.
The important thing here is that x will not change if screen is resized after the moment it was declared.
If you want it to, you'll need a resize event listener.
Also, a possible pitfall here is that depending on where in the document your <script> tag is placed, you might want to wrap all your code into an IIFE to ensure it fires after the document is completely loaded.

That's because you set the variable on start and never change it on resize
let timeout;
function testMatch() {
let x = window.matchMedia("(max-width: 800px)");
if (x.matches) {
function showQuote() {
let slides = document.getElementsByClassName("quoteWrapper");
for (let i = 0; i < slides.length; i++) {
slides[i].style.display = "none";
}
//the min was 0 so it was useless, if you do slides.length-1,
//you wont be able to access the last index
let randNum = Math.floor(Math.random() * slides.length);
slides[randNum].style.display = "block";
//set it so you can clear if user changes to > 600px
timeout = setTimeout(showQuote, 2000); // change every 2 seconds
}
showQuote();
} else if (timeout) {
clearTimeout(timeout);
}
}
testMatch();
addEventListener("resize", testMatch);
Also this could be a lot more efficiently done by using an id to signify which quote is not hidden.
(function () {
const slides = document.getElementsByClassName("quoteWrapper");
let timeout;
function testMatch() {
let x = window.matchMedia("(max-width: 800px)");
if (x.matches) {
function showQuote() {
//the min was 0 so it was useless, if you do slides.length-1,
//you wont be able to access the last index
let randNum = Math.floor(Math.random() * slides.length);
const prev = document.getElementById("current-quote");
if (prev) prev.removeAttribute("id");
slides[randNum].setAttribute("id", "current-quote");
timeout = setTimeout(showQuote, 2000); // change every 2 seconds
}
showQuote();
} else if (timeout) {
clearTimeout(timeout);
}
}
testMatch();
addEventListener("resize", testMatch);
})();
.quoteWrapper {
display: none;
}
#current-quote {
display: block;
}

How do I programatically change a picture inside a div?

Here there is full code as you guys can see.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Collage</title>
</head>
<style>
div
{
background: url("Image/191203174105-edward-whitaker-1-large-169.jpg")
;
height: 300px;
width: 300px;
}
</style>
<body>
<div id="div"></div>
<button id="button">Next</button>
<script>
As here I took variable im where I feed 3 images.
var im=[
{'img':'Image/191203174105-edward-whitaker-1-large-169.jpg',}
,{'img':'Image/5718897981_10faa45ac3_b-640x624.jpg',},
{'img':'Image/gettyimages-836272842-612x612.jpg',},
];
var a=document.getElementById('button');
var b=document.getElementById('div')
a.addEventListener('click',next);
so here according to my knowledge it should provide the link of the each pic as loop starts but in program. I dont get the desired result. Can you please help me understand why this is happening?
function next()
{
for(var i=1;i<im.length;i++)
{
b.style.background=`url(${im[i].img})`;
}
}
</script>
</body>
</html>

var i = 0;
var im = [{
'img': 'https://picsum.photos/536/354'
},
{
'img': 'https://picsum.photos/id/237/536/354'
},
{
'img': 'https://picsum.photos/seed/picsum/536/354'
}
];
var a = document.getElementById('button');
var b = document.getElementById('div')
a.addEventListener('click', next);
function next() {
console.log(i);
b.style.background = `url(${im[i].img})`;
i++;
if (i == im.length) {
i = 0;
}
}
div {
background: url("https://picsum.photos/id/1084/536/354?grayscale");
height: 300px;
width: 300px;
}
<div id="div"></div>
<button id="button">Next</button>

If you're looking to cycle through pictures on a button click, then you can't really use a loop. In the code that you posted, on the click of the button, it rapidly looped through all of the pictures. You need to create a counter, and increment it on each button click.
The snippet below I've added in a previous button as well and you can cycle through the pictures both forward and backward.
const im = {
'img1': 'https://placehold.it/300x150/ff0000/ffffff?text=image_1',
'img2': 'https://placehold.it/300x150/00ff00/ffffff?text=image_2',
'img3': 'https://placehold.it/300x150/0000ff/ffffff?text=image_3',
};
const imgDiv = document.getElementById('imgDiv')
const btnNext = document.getElementById('btnNext');
const btnPrev = document.getElementById('btnPrev');
const totImages = Object.keys(im).length;
let imgNumber = 1;
btnNext.addEventListener('click', next);
btnPrev.addEventListener('click', prev);
function next() {
imgNumber++
let img = imgNumber <= totImages ? `img${imgNumber}` : null;
if (img) imgDiv.style.background = `url(${im[img]})`;
if (imgNumber === totImages) btnNext.disabled = true;
if (imgNumber > 1) btnPrev.disabled = false;
}
function prev() {
imgNumber--
let img = imgNumber >= 0 ? `img${imgNumber}` : null;
if (img) imgDiv.style.background = `url(${im[img]})`;
if (imgNumber < totImages) btnNext.disabled = false;
if (imgNumber === 1) btnPrev.disabled = true;
}
#imgDiv {
background: url("https://placehold.it/300x150/ff0000/ffffff?text=image_1");
height: 150px;
width: 300px;
}
#btnDiv {
width: 300px;
height: auto;
position: relative;
}
#btnPrev {
position: absolute;
left: 0;
top: 0;
}
#btnNext {
position: absolute;
right: 0;
top: 0;
}
<div id="imgDiv"></div>
<div id='btnDiv'>
<button id="btnPrev" disabled>&loarr; Prev</button>
<button id="btnNext">Next &roarr;</button>
</div>

How to set interval to always last Xs when clicked on carousel button (vanilla JavaScript)

I have made custom carousel (for learning) on this web page. Carousel has 2 buttons (next and previous) and dots (each dot is 1 picture). It all works fine, but there is one problem. I want to make automatic loop carousel (to loop through images in interval of X seconds). Now i am using setInterval(nextImgShow, 2000);. But every time i click on either button (next, previous, dots) the interval changes.
Example: I have interval of 2s. If i click on a button when 1,5s has passed, the next image will only show for 0,5s. If i click it right away at 0,5s, the next image will show for 1,5s.
I already try to fix this with clearInterval();, but it does not change a thing. I also try to use clearInterval(); and than set interval again setInterval(nextImgShow, 2000); (on every button), but no luck.
I also try to use setTimeout(); but again nothing.
My wish is: If interval is 2s, when i click on either of buttons, i want to reset/set my interval back to 2s. So that every image is displayed for 2s, no matter when the button was clicked.
Can anyone help me solve this?
Below is JavaScript code and link to my web page, so you can see.
LINK: Link to page, so you can see demo
// navigation selection
const navigation = document.querySelector("ul.navigation");
const navigationToggleButton = document.querySelector(".navigation-toggle");
const navigationList = document.querySelectorAll(".navigation a");
// background image selector
const backgroundImgDiv = document.querySelector(".bg");
const previousImgBtn = document.querySelector(".prev");
const nextImgBtn = document.querySelector(".next");
const imgDotBtn = Array.from(document.querySelectorAll(".dot"));
const arrImg = ['url("img/0.jpg")', 'url("img/1.jpg")', 'url("img/2.jpg")', 'url("img/3.jpg")'];
const dot0 = document.querySelector(".dot-0");
const dot1 = document.querySelector(".dot-1");
const dot2 = document.querySelector(".dot-2");
const dot3 = document.querySelector(".dot-3");
let startImgIndex = 0;
let currentIndex = 0;
// navigation functions
function toggleNav() {
navigation.classList.toggle("active");
}
function navLink() {
navigation.classList.remove("active");
}
// background image functions
function nextImgShow() {
startImgIndex++;
if (startImgIndex === arrImg.length) {
startImgIndex = 0;
}
currentIndex = startImgIndex;
backgroundImgDiv.style.backgroundImage = arrImg[startImgIndex];
toggleDotActive(currentIndex);
}
function previousImgShow() {
startImgIndex--;
if (startImgIndex === -1) {
startImgIndex = (arrImg.length - 1);
}
currentIndex = startImgIndex;
backgroundImgDiv.style.backgroundImage = arrImg[startImgIndex];
toggleDotActive(currentIndex);
}
function dotBtnNavigate() {
if (this.classList.contains("dot-0")) {
dotBtnSet(0);
} else if (this.classList.contains("dot-1")) {
dotBtnSet(1);
} else if (this.classList.contains("dot-2")) {
dotBtnSet(2);
} else if (this.classList.contains("dot-3")) {
dotBtnSet(3);
}
}
function dotBtnSet (number) {
backgroundImgDiv.style.backgroundImage = arrImg[number];
startImgIndex = number;
currentIndex = number;
toggleDotActive(currentIndex);
}
function toggleDotActive(currentIndex) {
switch(currentIndex) {
case 0:
dot0.classList.add("dot-active");
dot1.classList.remove("dot-active");
dot2.classList.remove("dot-active");
dot3.classList.remove("dot-active");
break;
case 1:
dot0.classList.remove("dot-active");
dot1.classList.add("dot-active");
dot2.classList.remove("dot-active");
dot3.classList.remove("dot-active");
break;
case 2:
dot0.classList.remove("dot-active");
dot1.classList.remove("dot-active");
dot2.classList.add("dot-active");
dot3.classList.remove("dot-active");
break;
case 3:
dot0.classList.remove("dot-active");
dot1.classList.remove("dot-active");
dot2.classList.remove("dot-active");
dot3.classList.add("dot-active");
break;
default:
break;
}
}
// navigation events
navigationToggleButton.addEventListener("click", toggleNav);
navigationList.forEach(item => item.addEventListener("click", navLink));
// background image event
nextImgBtn.addEventListener("click", nextImgShow)
previousImgBtn.addEventListener("click", previousImgShow);
imgDotBtn.forEach(btn => btn.addEventListener("click", dotBtnNavigate));
// for touch devices (carousel navigate)
const gestureZone = document.querySelector('.img-wrap');
let touchstartX = 0;
let touchstartY = 0;
let touchendX = 0;
let touchendY = 0;
// for touch devices function (carousel navigate)
function handleGesture() {
if (touchendX <= touchstartX) {
nextImgShow();
}
if (touchendX >= touchstartX) {
previousImgShow();
}
}
setInterval(nextImgShow, 2000);
// navigation events
navigationToggleButton.addEventListener("click", toggleNav);
navigationList.forEach(item => item.addEventListener("click", navLink));
// background image event
nextImgBtn.addEventListener("click", nextImgShow);
previousImgBtn.addEventListener("click", previousImgShow);
imgDotBtn.forEach(btn => btn.addEventListener("click", dotBtnNavigate));
// for touch devices events (carousel navigate)
gestureZone.addEventListener('touchstart', function(event) {
touchstartX = event.changedTouches[0].screenX;
touchstartY = event.changedTouches[0].screenY;
}, false);
gestureZone.addEventListener('touchend', function(event) {
touchendX = event.changedTouches[0].screenX;
touchendY = event.changedTouches[0].screenY;
handleGesture();
}, false);

You should be passing the interval ID (returned from setInterval) to the clear interval function. For example:
let myIntervalID = setInterval(nextImgShow, 2000);
Then you can clear the interval doing clearInterval(myIntervalID) just make sure the variable myIntervalID is in scope when you clear it.
Your clearInterval wasn't actually clearing the interval so you ran into this problem. Once you correctly clear the interval (like above) and call the interval again (kinda like resetting the interval) your image will show for the full interval

You should assign the setInterval to a variable and use clearInterval when the user clicks on one of the buttons to change the image and then set the interval again.
<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script>
var change;
var i = 1;
var numOfImages = 3;
$(document).ready(function(){
document.getElementById("img1").classList.add("active");
change = setInterval(function(){
changeImage();
}, 2000);
});
function changeImage(){
var elem = document.getElementById("img"+i);
elem.style.display = "none";
i++;
if(i>numOfImages){
i = 1;
}
var elemToBeShown = "#img"+i;
$(elemToBeShown).show();
}
</script>
<style>
.images{
width: 50%;
margin-left: 40%;
}
#img2{
display: none;
}
#img3{
display: none;
}
.button{
border-radius: 50%;
height: 25px;
width: 25px;
margin: 0px 15px 15px 15px;
background-color: green;
display: inline-block;
}
.button:hover{
cursor: pointer;
background-color: blue;
}
</style>
</head>
<body>
<div class="images">
<img id="img1" 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Ncrco/4z90jaUalSPo/Cgo4Yr7X/ACbmqQIGoMg9fwBVwtPM7M7Rvzd+XVKzxPhPaRB6SicP8Gt50g3mTM+gjqvN2yoNsQAbOBzTM5g4CIbG3c721WOIaSc2g2AOhgNk31gD1V6NMNLgXSC0XbDvERIBM23nqNFvUptMAWAm5Mzy7HQI4Rt2wRZhqM1YE8wQC6GgGZA8l67APbTpZ3nK0CS42EA328oXm+FFn6jK7PdpgtAdeLAg7df9oP2l4gXRSafA3XbMdienJKy5fhY5NGU5Sovxbj5rv/6YjZpdBsOQ5oGnh3akG5N9ATvB31WXDcMXSRMi7SBm8W08hO69dR4c4O97VLGw2XGA1gBBG9vwKbx1LKueR/2+gyTUdIXYHBzHkYO8cvX5po3h8zEgX3+UrBnGKNOG02uqkA5f2tvykTe2y0qYTEYkeNzQIn3bTlgbZm6+qvjNf0i39wXHcQo0xDR713IHK3zd9khw9VzajnVARnuJMAHNzOosWr1dH2bHfTpyn+Uj9paTGkUWmXWc865RBhvfeOgUnlRdc72ul9w4tdGWKaJjp/P9JTiGeJM2Ee7bOoEG0WGnmhvd5pcszr40F9Qo6B20lvlsALamZmdIEbb+q2p0v77BahpaeRG9jzHmvY/H4o82YUqhBtor4skhptppqQCTr6FFVMIWta4kEPBIg3EGDO421j5LHGzDZIMEhschqdNCTPminFpVZid9AzQo4wugLhXukaC4jVDEI2tRMZuaDcuH5NubbCiyB6iqVFPYdD5j1eVgCrgrtqZA0aZlenWuspVJXnMzjY/wuKTKjWleVo1CnWCqKiE7IM+FLY9pLdoQ2GcjWBMOZLTOtat6bVVrVwVYWC+zx/t3Qy1GPAHiEOPVsxHkV5pi9f7btL6bSNGul3mIXlKBAInmJHMTdYtyPpPAleBfY2dQaWF7XAZcoLSfE5xmS0clbLAAve4OluymPNPOTTBDTpJnvC47EFwEx4RAtty67+qdqymN9huAJaQ6AYuA67SRbSb6rVz2hpmQ60BsZS3VwN7XiNVSlUa67Zbka1pBcDmJJkt/N1V7ZBMRlEuPnA0FpkBNj0e/uDYb/wCw1JIhpb3lDGmMwc4xBzTIBkXHzRuGaXZoEhvicRGmgt3J9eiE4jRFxM9oIJ6eUfNJnFcW0gl2dqcZcHuewh9RxJe9zG3LvitEHVDYjiTnuHv6j6nQEQOw+EeQQtXCkIc04K5GXLmWmv8AwZGMfQ1/+cawRRohp0zvPvHdwIgH1QFPFvD/AHge4PNy4OId66rDIo5inllyydt9fsFSGNfiuJqfFXqH/kWjzhVp0/dlubUmTPUWPUIKm10pjWwxgFxBdIDYuIiZlV+Pc7nTte2C9aB6r75R5lNMLRFpBDSQCYJj+4ul1PDGfy6Z4ao6GsLvDMtBgDMYEk/dX+MpW3JAS+xo/Dt0zifHIcC0eEeG+5N7LENMTFp1i3OPoj64aco8Lc1y58fEJBAI0bolrqlumsdeyqlSBReIE6TbnJF/LUIWs6StK9S97mBBGmgj5IV7lNlmgkWLlwXMKgk6LuWFLkzUa3QzqUrc0oxmHi4TDC4mbFdxTQk5IRyxsng5QlTESiIqUbqLmvHIs5IYAqwKzULl0eRJRvKgas2FbhHHYD0daEfhqsIFq1Dk2LoTNWekweIlOMIZXjcBiIdC9XgaohURlaOX5OLixk+wSvGV4RlauIXmuL4i8ArXpCsGPlKivEMWXNLeYIXmG2KbkoLEsBMjzQKe9na8WofKcZhs2hB8JdrEdENTMkA2ki/Ja4xmVxy6WiLoSqYTMk0v2LI7HOCoSKpY4HLBi1xPOeQNxOizrvGU6m21gDI9f7SejXgiTAm6YMrai92xbc639PkixZ4zWjXFo34W9uYhxdEQcoDjBzQI3vCpXdOtyTBOpgfnyWWBdBcBcmALTry5FEClmLogQC65DTDfO7uiZB3Ex6ZSgPe5g4y5v+R1btc77QhMThptpyVqzixzXtmR6EciihjKT7yGndrjoe51SnwlcJ/7QW+0KCADDrHnsVZ1Ec+yYvwBrGWw7nlIt9lSlh2hvw6HUa9o/lJ/DO2qVeme5mdGkTFpdMRBm15RD25j0GgXaJLSHMdBgkkEgtmQWyd4+q2wzd1XCHoEGe2COi0w5AJzNzCHACctyPCfI3VX+J8AjlcwPMoghhLcgcPCM0kOl98xEbLfZ5mWOc4NbABiRoATmEyefRLXMedk04iMoa0ggnxXEW/aRzm/ogqtX6X7pOZJvbYSBwwjVdoYYuMmwW+FMuk6D59Cis4lRTp9MXPI1pFWUABAWNWmi5WdQIJRVCFJ2LXiFo2vNipXCDcVLKTg9FKXJBJaurFldREpwfs2mGEKsLchVypjQlM40LUFUhQIk6BezVpUL1mSqyicjKNhUTfh3EjokjWyV6XhGBZE7p2Dk2T+TwUdhzXucEi4o0hy9SylCXcT4dnVU42tEGHKoz30eaqkwshh3HReip8LGiY0eHtA0U7wNvbKn5cY9HmsLwuo4RtyKZ0fZtp+IJ3TytQeO40GaGU5RjFbE/ics3UTtL2XoAeJgK85xjAjD1HXIaSDSy3kH4hP7SEbU9qXGwCqzD1MSCcxBiW9FkZxb+UqxSyQd5Ho83SqFrpGhsexTZ8EABrWlrYcQT4iJvffsk2Nw7qbi14gj59ua34bxBvhY4RFmuGpvMO+gWYs8Yz4S9nSatWgt1IkOMaAT02CW1sJunIotIkuvsN//wBco1CNZg3M8NQOptcPEcs5m9BvCpyYY5FTMUqFWG4VV917wN8IF7xqToN1ak61wDY6315dUx/RuaHMZWe1juYIkayW9UufiK+VzSacBoaJaM0TPg5FeS4KkjLbOYqoDAgAgBtgB4W843mbqPr5G9do5/wsKVMgFzpNrnrbX1WbjmP8rHN19wkktEoWLS4SJkjmdYPdG06wa4uIgAuMAkRrYHVDteQA2bTmubDa4Up4N1VpANpv5f7QuXCOuwZSS3IAxGOc92ZxJsA2TMNGgHRdw9N1Q9N+ydYT2faLvKvxENa3KwQoOGRq5sU/Ki3xgLa9QCwEALNlRYlSVO57DUVQYKi46ohBUXDUXviGcC1dyCeVq9yxIUuWVsfBUUUXYXEgaeidTVMi3WLiuxJI5ibK5FUhbBVehaCTMlxRxWZJS2w0jRok2XouH5mtEJRw7DEm69PQo5QOSr8eL7IvLyL9Ibh3khX92UC3HtaYlFPxrSNVbRzJQkvRZtJSrVDRqhamLAFiEix9eo462S5zURmPC5vYbjsdMwV5zFOLitnPcTCPwnDyVFJvI6OjBRwqwXA8PnVMsRjTQbAR9LDimJK83x/Gh5geac0sWO/YMJPNPfQsx+LNZxLvJAFkIjKumlK5juTuXZ1YNRVIo3GVAIDvoVvS43iAQTUc8CwDyX23AJuEPUYBzlYkI5TywaqT/kZSZ6E+1Gac1IjYQ8vgDYZlKXF6BJztqRlMZQJz7b6LzsLoamx87OtPZnCJviMQ52p8hoE0wvGvd4c0DTDpuHcvuUvwuHnlpN10tE9EcXkheRvbBlxfZocSXxDYjU/ZOMBXgQk7SNrIijUhejmk5XJk+Zc1Q+dXsl2KuuNrKr3SnSnaJIQ4sBqU0NUKOqoKqFDkRbBmOZVLlxyqpHJlCQVg6GcgL1+F9mm5ZjVeQ4XiMlQHZfUOG1w9gI5LqeDGEoXWzm+dknBquhAPZlnJdXoXuuorfhx+hD+IyfU8E51liXKKLnzZ0YonvFV1RRRLcmMpGbTJher4Xw2mW3EqKKzxEmm2SedJxiqAOKPLKjWsH+k7pVpYAVFE7H+pkuVflxYrxWDkzKwc12xUURyQUJugd+YbqtNrnGAVFFLJboov5bGeGwAFymdBvJRRPhFIgnJy7F3tFjYbAXkHOUUUflSfOjreJFLHo5Ks0qKKayphDYOoVH4Zh2jsoomdoVbT0Z/pG8yuvDYiFFEt66Dtvsyc5Z51FEiUmMSLsctmOUUTIMGSCGvV866oqUxDRm9yGqriiCQcAV4WZUUUMlspRVew9lOLH4CooqvBm45aXsR5cFLG7PUPkqKKLtnBP//Z" width="125" height="125"/>
<img id="img3" src="https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcRkoieaGln2U5aMZQZibEmbva3LVpVVOw-GbcizRKfmZzog4B5lnw" width="125" height="125"/>
</div>
<div style="width: 100%; text-align: center; margin-top: 25px;">
<div class="button" id="button1"></div>
<div class="button" id="button2"></div>
<div class="button" id="button3"></div>
</div>
<script>
$('.button').click(function(e){
var buttonid = $(this).attr('id');
var imgid = parseInt(buttonid.substring(6, buttonid.length), 10);
if(i!=imgid){
clearInterval(change);
document.getElementById("img"+i).style.display = "none";
document.getElementById("img"+imgid).style.display = "block";
i = imgid;
change = setInterval(function(){
changeImage();
}, 2000);
}
});
</script>
</body>
</html>

requestAnimationFrame gives the wrong timestamp when showing a confirm dialog (Chromium?)

I have a simple animation, which is done using requestAnimationFrame (for demo purposes adapted from the example on MDN). If before the animation I show a confirm dialog, the timestamp received by the animation function is wrong. The difference between the first and second timestamps is equal to the time from the moment the confirm message was shown, until the "OK" button was clicked. This behaviour (bug?) is visible in Chrome and Opera (both running Chromium). Firefox and Internet Explorer 11 run as expected. Check the fiddle or the example below.
const cache = {
start: null,
target: null
};
function animate(timestamp) {
console.log(timestamp);
if (cache.start === null) {
cache.start = timestamp;
}
var progress = timestamp - cache.start;
cache.target.style.left = Math.min(progress / 10, 100) + 'px';
if (progress < 1000) {
requestAnimationFrame(animate);
} else {
cache.target.style.left = 0;
cache.start = null;
}
}
(function() {
const target = document.getElementsByTagName("div")[0];
cache.target = target;
const cb = document.getElementsByTagName("input")[0];
const btn = document.getElementsByTagName("button")[0];
btn.addEventListener("click", function() {
if (cb.checked) {
if (confirm("Just click 'OK' to start the animation, ok?")) {
requestAnimationFrame(animate);
}
} else {
requestAnimationFrame(animate);
}
})
})();
html,
body {
padding: 0;
margin: 0;
}
div {
width: 50px;
height: 50px;
border: 1px solid black;
background-color: yellowgreen;
position: absolute;
top: 50px;
}
button {
margin-top: 20px;
}
<button type="button">Start</button>
<label>
<input type="checkbox" />use "confirm"</label>
<div>
</div>
Open the console to see the received timestamps. The animation is set to run for 2 seconds. When showing the confirm dialog, if the "OK" button gets clicked faster than 2 seconds, the animation runs for the "remaining" time. If the time needed to click the "OK" button is longer than the time animation time, the element will not be animated and there will be 2 values (timestamps) sent to the console; the difference of these 2 values is the time needed to click the "OK" button.
I assume that this is a bug in Chromium. Is there a workaround for this (still animating with requestAnimationFrame, not trough CSS)? I couldn't find anything regarding this in their tracker. Does anybody have additional info on this?

I have to say, I found this very interesting.
After spending to much time on it I may have found a workaround for you. You can see that here. https://jsfiddle.net/qtj467n0/13/
The basic gist of it is, I replaced the DOMHighResTimeStamp that requestAnimationFrame provides with performance.now() which also returns a DOMHighResTimeStamp.
const cache = {
start: null,
target: null,
time: 2000
};
function animate(timestamp) {
console.log(timestamp);
if (cache.start === null) {
cache.start = timestamp;
}
var progress = timestamp - cache.start;
cache.target.style.left = Math.min(progress / 10, cache.time / 10) + 'px';
if (progress < cache.time) {
requestAnimationFrame(animate);
} else {
cache.target.style.left = 0;
cache.start = null;
}
}
const render = () => {
requestAnimationFrame((timestamp) => {
const performanceNow = performance.now();
animate(performanceNow)
});
}
(function() {
const target = document.getElementsByTagName("div")[0];
cache.target = target;
const cb = document.getElementsByTagName("input")[0];
const btn = document.getElementsByTagName("button")[0];
btn.addEventListener("click", function() {
if (cb.checked) {
const confirmed = confirm("Just click 'OK' to start the animation, ok?");
if (confirmed) {
render();
}
} else {
requestAnimationFrame(animate);
}
})
})();
html,
body {
padding: 0;
margin: 0;
}
div {
width: 50px;
height: 50px;
border: 1px solid black;
background-color: yellowgreen;
position: absolute;
top: 50px;
}
button {
margin-top: 20px;
}
<button type="button">Start</button>
<label>
<input type="checkbox" />use "confirm"</label>
<div>
</div>

Image gallery with max items and pagination with javascript

This is my situation:
I have a image gallery with 10 images visible on the main page and a pagination bar. The images came from a for loop iteration over a json file. That's no problem, they are just there ;-)
Something like:
for i=0; i <10; i++
create div with styles and images[i].image;
My question is:
I want to display the next 10 images on page 2, so when you click on page 2, it counts from 11 to 20.
I found the jQuery 'Jpaginate'-plugin...
Can i accomplish that with this plugin?
Could someone explain me in the way i have to thing with Vars, Counts, Objects??
Thanks and kind regards,
Mike

I have made you an example on how you can approach this. I'm not saying it is bugproof, but it's the concept that matters. You might find some inspiration and maybe reach your goal.
var imgSrc = "https://s-media-cache-ak0.pinimg.com/236x/36/a5/7b/36a57b0f0ab16e885fcc230addb695c2.jpg";
var json = [];
for (var i = 0; i < 36; i++)
json.push({
Title: "Title " + (i + 1),
Source: imgSrc
});
/*
Just for ease, I'm creating an array with 36 objects (3x3 gallery)
so 9 images per page
*/
var pageLimit = 9;
var page = 1;
showImages();
$("#btnPrevious").click(function() {
if (pageLimit <= 9) {
pageLimit = 9;
page = 1;
} else {
page--;
pageLimit -= 9;
}
showImages();
});
$("#btnNext").click(function() {
if (pageLimit >= json.length) {
pageLimit = json.length;
} else {
page++;
pageLimit += 9;
}
showImages();
});
function showImages() {
$(".images").empty();
for (var i = pageLimit - 9; i < pageLimit; i++) {
var template = $("<div></div>").addClass("template");
var img = $("<img>");
img.attr("src", json[i].Source);
img.attr("alt", json[i].Title);
var br = $("<br/>");
var title = $("<span></span>").html(json[i].Title);
template.append(img).append(br).append(title);
$(".images").append(template);
}
$("#page").html("Page " + page);
}
.gallery {
width: 100%;
height: 500px;
border: 1px solid black;
background-color: lightgray;
text-align: center;
}
.images {
width: 90%;
margin: 0 auto;
height: 100%;
margin-bottom: 15px;
}
img {
height: auto;
width: 33%;
margin: 20px 5px;
}
.template {
float: left;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="gallery">
<div class="images"></div>
<button id="btnPrevious">
< Previous
</button>
<span id="page"></span>
<button id="btnNext">
> Next
</button>
</div>
Don't mind the CSS, because I suck at that (lol). It was based on the space I had on jsFiddle, but looking at it now (on full page or just the area the snippet provides) it looks awful. If a CSS guru could fix this .. Question in a question?

You can create your own pagination plugin.
You must store current page somewhere and modify your factory.
Something like: for i=current_page * count_per_page; i < count_per_page * (current_page + 1); i++ create div with styles and images[i].image;