Add a Carousel Slideshow gallery

Add a Carousel Slideshow gallery - javascript

I'm learning HTML, CSS and Java.
I'm tryng to add to my website a slideshow but i don't understand why i don't see nothing when i try to run it. I found this one and i'm try to make it work but i can't see an image, i can see only the pointer to go next or back.
<!-- Slideshow container -->
<div class="slideshow-container">
<!-- Full-width images with number and caption text -->
<div class="mySlides fade">
<div class="numbertext">1 / 9</div>
<img src="FotoGP.jpg" style="width:100%">
</div>
<div class="mySlides fade">
<div class="numbertext">2 / 9</div>
<img src="FotoSalaPesi.jpg" style="width:100%">
<div class="text">Sala Pesi</div>
</div>
<div class="mySlides fade">
<div class="numbertext">3 / 9</div>
<img src="FotoSalaCardio.jpg" style="width:100%">
<div class="text">Cardio</div>
</div>
<div class="mySlides fade">
<div class="numbertext">4 / 9</div>
<img src="FotoSalaCircuiti.jpg" style="width:100%">
<div class="text">Circuiti Funzionali</div>
</div>
<div class="mySlides fade">
<div class="numbertext">5 / 9</div>
<img src="FotoSalaAddominali.jpg" style="width:100%">
</div>
<div class="mySlides fade">
<div class="numbertext">6 / 9</div>
<img src="FotoSalaGambe.jpg" style="width:100%">
</div>
<div class="mySlides fade">
<div class="numbertext">7 / 9</div>
<img src="FotoSalaBilanceri.jpg" style="width:100%">
<div class="text">Sala Pesi</div>
</div>
<div class="mySlides fade">
<div class="numbertext">8 / 9</div>
<img src="FotoAperto.jpg" style="width:100%">
<div class="text">All'aperto</div>
</div>
<div class="mySlides fade">
<div class="numbertext">9 / 9</div>
<img src="FotoUfficio.jpg" style="width:100%">
</div>
<!-- Next and previous buttons -->
<a class="prev" onclick="plusSlides(-1)">❮</a>
<a class="next" onclick="plusSlides(1)">❯</a>
</div>
<br>
<!-- The dots/circles -->
<div style="text-align:center">
<span class="dot" onclick="currentSlide(1)"></span>
<span class="dot" onclick="currentSlide(2)"></span>
<span class="dot" onclick="currentSlide(3)"></span>
<span class="dot" onclick="currentSlide(4)"></span>
<span class="dot" onclick="currentSlide(5)"></span>
<span class="dot" onclick="currentSlide(6)"></span>
<span class="dot" onclick="currentSlide(7)"></span>
<span class="dot" onclick="currentSlide(8)"></span>
<span class="dot" onclick="currentSlide(9)"></span>
</div>
This is CSS part
* {box-sizing:border-box}
/* Slideshow container */
.slideshow-container {
max-width: 100%;
position: relative;
margin: auto;
}
/* Hide the images by default */
.mySlides {
display: none;
}
/* Next & previous buttons */
.prev, .next {
cursor: pointer;
position: absolute;
top: 50%;
width: auto;
margin-top: -22px;
padding: 16px;
color: white;
font-weight: bold;
font-size: 18px;
transition: 0.6s ease;
border-radius: 0 3px 3px 0;
user-select: none;
}
/* Position the "next button" to the right */
.next {
right: 0;
border-radius: 3px 0 0 3px;
}
/* On hover, add a black background color with a little bit see-through */
.prev:hover, .next:hover {
background-color: rgba(0,0,0,0.8);
}
/* Caption text */
.text {
color: #f2f2f2;
font-size: 15px;
padding: 8px 12px;
position: absolute;
bottom: 8px;
width: 100%;
text-align: center;
}
/* Number text (1/3 etc) */
.numbertext {
color: #f2f2f2;
font-size: 12px;
padding: 8px 12px;
position: absolute;
top: 0;
}
/* The dots/bullets/indicators */
.dot {
cursor: pointer;
height: 15px;
width: 15px;
margin: 0 2px;
background-color: #bbb;
border-radius: 50%;
display: inline-block;
transition: background-color 0.6s ease;
}
.active, .dot:hover {
background-color: #717171;
}
/* Fading animation */
.fade {
-webkit-animation-name: fade;
-webkit-animation-duration: 1.5s;
animation-name: fade;
animation-duration: 1.5s;
}
#-webkit-keyframes fade {
from {opacity: .4}
to {opacity: 1}
}
#keyframes fade {
from {opacity: .4}
to {opacity: 1}
}
And JS
var slideIndex = 1;
showSlides(slideIndex);
// Next/previous controls
function plusSlides(n) {
showSlides(slideIndex += n);
}
// Thumbnail image controls
function currentSlide(n) {
showSlides(slideIndex = n);
}
function showSlides(n) {
var i;
var slides = document.getElementsByClassName("mySlides");
var dots = document.getElementsByClassName("dot");
if (n > slides.length) {slideIndex = 1}
if (n < 1) {slideIndex = slides.length}
for (i = 0; i < slides.length; i++) {
slides[i].style.display = "none";
}
for (i = 0; i < dots.length; i++) {
dots[i].className = dots[i].className.replace(" active", "");
}
slides[slideIndex-1].style.display = "block";
dots[slideIndex-1].className += " active";
}
var slideIndex = 0;
showSlides();
function showSlides() {
var i;
var slides = document.getElementsByClassName("mySlides");
for (i = 0; i < slides.length; i++) {
slides[i].style.display = "none";
}
slideIndex++;
if (slideIndex > slides.length) {slideIndex = 1}
slides[slideIndex-1].style.display = "block";
setTimeout(showSlides, 2000); // Change image every 2 seconds
}
what i'm missing? Thank you for your help!

The path of your image seems not right
Look it works with placeholders
var slideIndex = 1;
showSlides(slideIndex);
// Next/previous controls
function plusSlides(n) {
showSlides(slideIndex += n);
}
// Thumbnail image controls
function currentSlide(n) {
showSlides(slideIndex = n);
}
function showSlides(n) {
var i;
var slides = document.getElementsByClassName("mySlides");
var dots = document.getElementsByClassName("dot");
if (n > slides.length) {
slideIndex = 1
}
if (n < 1) {
slideIndex = slides.length
}
for (i = 0; i < slides.length; i++) {
slides[i].style.display = "none";
}
for (i = 0; i < dots.length; i++) {
dots[i].className = dots[i].className.replace(" active", "");
}
slides[slideIndex - 1].style.display = "block";
dots[slideIndex - 1].className += " active";
}
var slideIndex = 0;
showSlides();
function showSlides() {
var i;
var slides = document.getElementsByClassName("mySlides");
for (i = 0; i < slides.length; i++) {
slides[i].style.display = "none";
}
slideIndex++;
if (slideIndex > slides.length) {
slideIndex = 1
}
slides[slideIndex - 1].style.display = "block";
setTimeout(showSlides, 2000); // Change image every 2 seconds
}
* {
box-sizing: border-box
}
/* Slideshow container */
.slideshow-container {
max-width: 100%;
position: relative;
margin: auto;
}
/* Hide the images by default */
.mySlides {
display: none;
}
/* Next & previous buttons */
.prev,
.next {
cursor: pointer;
position: absolute;
top: 50%;
width: auto;
margin-top: -22px;
padding: 16px;
color: white;
font-weight: bold;
font-size: 18px;
transition: 0.6s ease;
border-radius: 0 3px 3px 0;
user-select: none;
}
/* Position the "next button" to the right */
.next {
right: 0;
border-radius: 3px 0 0 3px;
}
/* On hover, add a black background color with a little bit see-through */
.prev:hover,
.next:hover {
background-color: rgba(0, 0, 0, 0.8);
}
/* Caption text */
.text {
color: #f2f2f2;
font-size: 15px;
padding: 8px 12px;
position: absolute;
bottom: 8px;
width: 100%;
text-align: center;
}
/* Number text (1/3 etc) */
.numbertext {
color: #f2f2f2;
font-size: 12px;
padding: 8px 12px;
position: absolute;
top: 0;
}
/* The dots/bullets/indicators */
.dot {
cursor: pointer;
height: 15px;
width: 15px;
margin: 0 2px;
background-color: #bbb;
border-radius: 50%;
display: inline-block;
transition: background-color 0.6s ease;
}
.active,
.dot:hover {
background-color: #717171;
}
/* Fading animation */
.fade {
-webkit-animation-name: fade;
-webkit-animation-duration: 1.5s;
animation-name: fade;
animation-duration: 1.5s;
}
#-webkit-keyframes fade {
from {
opacity: .4
}
to {
opacity: 1
}
}
#keyframes fade {
from {
opacity: .4
}
to {
opacity: 1
}
}
<div class="slideshow-container">
<!-- Full-width images with number and caption text -->
<div class="mySlides fade">
<div class="numbertext">1 / 9</div>
<img src="https://via.placeholder.com/150" style="width:100%">
</div>
<div class="mySlides fade">
<div class="numbertext">2 / 9</div>
<img src="https://via.placeholder.com/150" style="width:100%">
<div class="text">Sala Pesi</div>
</div>
<div class="mySlides fade">
<div class="numbertext">3 / 9</div>
<img src="https://via.placeholder.com/150" style="width:100%">
<div class="text">Cardio</div>
</div>
<div class="mySlides fade">
<div class="numbertext">4 / 9</div>
<img src="https://via.placeholder.com/150" style="width:100%">
<div class="text">Circuiti Funzionali</div>
</div>
<div class="mySlides fade">
<div class="numbertext">5 / 9</div>
<img src="https://via.placeholder.com/150" style="width:100%">
</div>
<div class="mySlides fade">
<div class="numbertext">6 / 9</div>
<img src="FotoSalaGambe.jpg" style="width:100%">
</div>
<div class="mySlides fade">
<div class="numbertext">7 / 9</div>
<img src="FotoSalaBilanceri.jpg" style="width:100%">
<div class="text">Sala Pesi</div>
</div>
<div class="mySlides fade">
<div class="numbertext">8 / 9</div>
<img src="FotoAperto.jpg" style="width:100%">
<div class="text">All'aperto</div>
</div>
<div class="mySlides fade">
<div class="numbertext">9 / 9</div>
<img src="FotoUfficio.jpg" style="width:100%">
</div>
<!-- Next and previous buttons -->
<a class="prev" onclick="plusSlides(-1)">❮</a>
<a class="next" onclick="plusSlides(1)">❯</a>
</div>
<br>
<!-- The dots/circles -->
<div style="text-align:center">
<span class="dot" onclick="currentSlide(1)"></span>
<span class="dot" onclick="currentSlide(2)"></span>
<span class="dot" onclick="currentSlide(3)"></span>
<span class="dot" onclick="currentSlide(4)"></span>
<span class="dot" onclick="currentSlide(5)"></span>
<span class="dot" onclick="currentSlide(6)"></span>
<span class="dot" onclick="currentSlide(7)"></span>
<span class="dot" onclick="currentSlide(8)"></span>
<span class="dot" onclick="currentSlide(9)"></span>
</div>

I don't know how new you are to HTML but here are some common fixes:
Make sure to double-check your image sources are correct. And if you they are in a another directory, include the relative path to the image. Ex.: <img src="images/FotoAperto.jpg">
Make sure you have your css imports right. <link rel="stylesheet" href="style.css">
Check if your JS script is imported right, and place the <script> tag after the closing</body>-tag <script src="index.js"></script>.
I hope it helped :)

Related

Skip to next div slideshow

I have a slideshow with some images. I change between divs that contain images with next and prev keys (every div contain an image). I want to be able to hide one of these picture. Not just hide it, but skipping to next div. The example is from w3school I want to be able to skip the images that have a specific class, not just hide them. Because when I tried to make display to none, this hided the image but the div is still showing.
let slideIndex = 1;
showSlides(slideIndex);
function plusSlides(n) {
showSlides(slideIndex += n);
}
function currentSlide(n) {
showSlides(slideIndex = n);
}
function showSlides(n) {
let i;
let slides = document.getElementsByClassName("mySlides");
let dots = document.getElementsByClassName("dot");
if (n > slides.length) {slideIndex = 1}
if (n < 1) {slideIndex = slides.length}
for (i = 0; i < slides.length; i++) {
slides[i].style.display = "none";
}
for (i = 0; i < dots.length; i++) {
dots[i].className = dots[i].className.replace(" active", "");
}
slides[slideIndex-1].style.display = "block";
dots[slideIndex-1].className += " active";
}
* {box-sizing: border-box}
body {font-family: Verdana, sans-serif; margin:0}
.mySlides {display: none}
img {vertical-align: middle;}
/* Slideshow container */
.slideshow-container {
max-width: 1000px;
position: relative;
margin: auto;
}
/* Next & previous buttons */
.prev, .next {
cursor: pointer;
position: absolute;
top: 50%;
width: auto;
padding: 16px;
margin-top: -22px;
color: white;
font-weight: bold;
font-size: 18px;
transition: 0.6s ease;
border-radius: 0 3px 3px 0;
user-select: none;
}
/* Position the "next button" to the right */
.next {
right: 0;
border-radius: 3px 0 0 3px;
}
/* On hover, add a black background color with a little bit see-through */
.prev:hover, .next:hover {
background-color: rgba(0,0,0,0.8);
}
/* Caption text */
.text {
color: #f2f2f2;
font-size: 15px;
padding: 8px 12px;
position: absolute;
bottom: 8px;
width: 100%;
text-align: center;
}
/* Number text (1/3 etc) */
.numbertext {
color: #f2f2f2;
font-size: 12px;
padding: 8px 12px;
position: absolute;
top: 0;
}
/* The dots/bullets/indicators */
.dot {
cursor: pointer;
height: 15px;
width: 15px;
margin: 0 2px;
background-color: #bbb;
border-radius: 50%;
display: inline-block;
transition: background-color 0.6s ease;
}
.active, .dot:hover {
background-color: #717171;
}
/* Fading animation */
.fade {
animation-name: fade;
animation-duration: 1.5s;
}
#keyframes fade {
from {opacity: .4}
to {opacity: 1}
}
/* On smaller screens, decrease text size */
#media only screen and (max-width: 300px) {
.prev, .next,.text {font-size: 11px}
}
<div class="slideshow-container">
<div class="mySlides fade">
<div class="numbertext">1 / 5</div>
<img src="https://picsum.photos/220" style="width:100%">
<div class="text">Caption Text</div>
</div>
<div class="dontview" style="display:none">
<div class="mySlides fade">
<div class="numbertext">2 / 5</div>
<img src="https://picsum.photos/212" style="width:100%">
<div class="text">Caption Two</div>
</div>
</div>
<div class="dontview" style="display:none">
<div class="mySlides fade">
<div class="numbertext">3 / 5</div>
<img src="https://picsum.photos/241" style="width:100%">
<div class="text">Caption Two</div>
</div>
</div>
<div class="mySlides fade">
<div class="numbertext">4 / 5</div>
<img src="https://picsum.photos/244" style="width:100%">
<div class="text">Caption Three</div>
</div>
<div class="mySlides fade">
<div class="numbertext">5 / 5</div>
<img src="https://picsum.photos/201" style="width:100%">
<div class="text">Caption Three</div>
</div>
<a class="prev" onclick="plusSlides(-1)">❮</a>
<a class="next" onclick="plusSlides(1)">❯</a>
</div>
<br>
<div style="text-align:center">
<span class="dot" onclick="currentSlide(1)"></span>
<span class="dot" onclick="currentSlide(2)"></span>
<span class="dot" onclick="currentSlide(3)"></span>
<span class="dot" onclick="currentSlide(4)"></span>
<span class="dot" onclick="currentSlide(5)"></span>
</div>

it better to write
<div class="mySlides fade dontview">
instead of
<div class="dontview" style="display:none">
<div class="mySlides fade">
then to skip element that has class dontview do
if (slides[slideIndex - 1].classList.contains("dontview")) {
return showSlides(slideIndex += 1)
}
demo
let slides = document.querySelectorAll(".mySlides"),
dots = document.querySelectorAll(".dot");
let slideIndex = 0;
showSlides(slideIndex);
function isSkip(n) {
return slides[slideIndex + n].classList.contains("dontview");
}
function plusSlides(n) {
if (n > 0) {
if (slideIndex == slides.length - 1)
return showSlides(slideIndex = 0)
if (isSkip(1)) {
slideIndex += 1
return plusSlides(1)
}
}
if (n < 0) {
if (slideIndex == 0)
return showSlides(slideIndex = slides.length - 1)
if (isSkip(-1)) {
slideIndex -= 1
return plusSlides(-1)
}
}
slideIndex += n
showSlides(slideIndex);
}
function showSlides(n) {
for (let i = 0; i < slides.length; i++) {
slides[i].style.display = slideIndex == i ? "block" : "none";
dots[i].className = slideIndex == i ? "dot active" : "dot";
}
}
function currentSlide(n) {
showSlides(slideIndex = n);
}
*{box-sizing:border-box}
body{font-family:Verdana,sans-serif;margin:0}
.mySlides{display:none}
img{vertical-align:middle}
.slideshow-container{max-width:200px;position:relative;margin:auto}
.prev,.next{cursor:pointer;position:absolute;top:50%;width:auto;padding:16px;margin-top:-22px;color:#fff;font-weight:700;font-size:18px;transition:.6s ease;border-radius:0 3px 3px 0;user-select:none}
.next{right:0;border-radius:3px 0 0 3px}
.prev:hover,.next:hover{background-color:rgba(0,0,0,0.8)}
.text{color:#f2f2f2;font-size:15px;padding:8px 12px;position:absolute;bottom:8px;width:100%;text-align:center}
.numbertext{color:#f2f2f2;font-size:12px;padding:8px 12px;position:absolute;top:0}
.dot{cursor:pointer;height:15px;width:15px;margin:0 2px;background-color:#bbb;border-radius:50%;display:inline-block;transition:background-color .6s ease}
.active,.dot:hover{background-color:#717171}
.fade{animation-name:fade;animation-duration:1.5s}
#keyframes fade {from{opacity:.4}to{opacity:1}}
#media only screen and (max-width: 300px) {.prev,.next,.text{font-size:11px}}
<div class="slideshow-container">
<div class="mySlides fade">
<div class="numbertext">1 / 5</div>
<img src="https://via.placeholder.com/200/0000FF/FFFFFF/?text=1" style="width:100%">
<div class="text">Caption one</div>
</div>
<div class="mySlides fade dontview">
<div class="numbertext">2 / 5</div>
<img src="https://via.placeholder.com/200/0000FF/FFFFFF/?text=2" style="width:100%">
<div class="text">Caption Two</div>
</div>
<div class="mySlides fade">
<div class="numbertext">3 / 5</div>
<img src="https://via.placeholder.com/200/ff0000/FFFFFF/?text=3" style="width:100%">
<div class="text">Caption three</div>
</div>
<div class="mySlides fade dontview">
<div class="numbertext">4 / 5</div>
<img src="https://via.placeholder.com/200/FF0000/FFFFFF/?text=4" style="width:100%">
<div class="text">Caption four</div>
</div>
<div class="mySlides fade">
<div class="numbertext">5 / 5</div>
<img src="https://via.placeholder.com/200/006600/FFFFFF/?text=5" style="width:100%">
<div class="text">Caption five</div>
</div>
<a class="prev" onclick="plusSlides(-1)">❮</a>
<a class="next" onclick="plusSlides(1)">❯</a>
</div>
<br>
<div style="text-align:center">
<span class="dot" onclick="currentSlide(0)"></span>
<span class="dot" onclick="currentSlide(1)"></span>
<span class="dot" onclick="currentSlide(2)"></span>
<span class="dot" onclick="currentSlide(3)"></span>
<span class="dot" onclick="currentSlide(4)"></span>
</div>

Clicking on Slideshow works, but the auto run still runs

Essentially, my website's next arrow for the slideshow is working, but when you click on it, the image moves on and the timer still continues instead of stopping. If you keep clicking the next button, it skips the second image and then after stopping, it continues on very quickly in switching images. It is a peculiar bug and here it is in action: https://codepen.io/kush2610/pen/bGNYBPe
HTML CODE
<section class="pictures">
<h2 >Product Portfolio</h2 >
<!-- Slideshow container -->
<div class="slideshow-container">
<!-- Full-width images with number and caption text -->
<div class="mySlides fade">
<img src="https://images.unsplash.com/photo-1508138221679-760a23a2285b?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1567&q=80" style="width:100%">
</div>
<div class="mySlides fade">
<img src="https://images.unsplash.com/photo-1494253109108-2e30c049369b?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=3900&q=80" style="width:100%">
</div>
<div class="mySlides fade">
<img src="https://images.unsplash.com/photo-1485550409059-9afb054cada4?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=2598&q=80" style="width:100%">
</div>
<!-- Next and previous buttons -->
<a class="prev" onclick="plusSlides(-1)">❮</a>
<a class="next" onclick="plusSlides(1)">❯</a>
</div>
<br>
<!-- The dots/circles -->
<div style="text-align:center">
<span class="dot" onclick="currentSlide(1)"></span>
<span class="dot" onclick="currentSlide(2)"></span>
<span class="dot" onclick="currentSlide(3)"></span>
</div>
</section>
Sorry if this sounds really strange what I am describing but it is such a strange bug I honestly do not know what else to say.

Don't use the same name for both showSlides functions. Overloading functions is not an option in JavaScript.
/* The SlideShow */
var slideIndex = 0;
// Next/previous controls
function plusSlides(n) {
showSlides(slideIndex += n);
}
// Thumbnail image controls
function currentSlide(n) {
showSlides(slideIndex = n);
}
function showSlides(n) {
var i;
var slides = document.getElementsByClassName("mySlides");
var dots = document.getElementsByClassName("dot");
if (n > slides.length) {
slideIndex = 1
}
if (n < 1) {
slideIndex = slides.length
}
for (i = 0; i < slides.length; i++) {
slides[i].style.display = "none";
}
for (i = 0; i < dots.length; i++) {
dots[i].className = dots[i].className.replace(" active", "");
}
slides[slideIndex - 1].style.display = "block";
dots[slideIndex - 1].className += " active";
}
function showNextSlide() {
var i;
var slides = document.getElementsByClassName("mySlides");
for (i = 0; i < slides.length; i++) {
slides[i].style.display = "none";
}
slideIndex++;
if (slideIndex > slides.length) {
slideIndex = 1
}
slides[slideIndex - 1].style.display = "block";
setTimeout(showNextSlide, 7000); // Change image every 7 seconds
}
showNextSlide();
.pictures {
padding-top: 50px;
padding-right: 30px;
padding-bottom: 50px;
padding-left: 80px;
;
}
/* Slideshow container */
.slideshow-container {
max-width: 1000px;
position: relative;
margin: auto;
}
/* Hide the images by default */
.mySlides {
display: none;
}
/* Next & previous buttons */
.prev,
.next {
cursor: pointer;
position: absolute;
top: 50%;
width: auto;
margin-top: -22px;
padding: 16px;
color: white;
font-weight: bold;
font-size: 18px;
transition: 0.6s ease;
border-radius: 0 3px 3px 0;
user-select: none;
}
/* Position the "next button" to the right */
.next {
right: 0;
border-radius: 3px 0 0 3px;
}
/* On hover, add a black background color with a little bit see-through */
.prev:hover,
.next:hover {
background-color: rgba(0, 0, 0, 0.8);
}
/* Caption text */
.text {
color: #f2f2f2;
font-size: 15px;
padding: 8px 12px;
position: absolute;
bottom: 8px;
width: 100%;
text-align: center;
}
/* Number text (1/3 etc) */
.numbertext {
color: #f2f2f2;
font-size: 12px;
padding: 8px 12px;
position: absolute;
top: 0;
}
/* The dots/bullets/indicators */
.dot {
cursor: pointer;
height: 15px;
width: 15px;
margin: 0 2px;
background-color: #bbb;
border-radius: 50%;
display: inline-block;
transition: background-color 0.6s ease;
}
.active,
.dot:hover {
background-color: #717171;
}
/* Fading animation */
.fade {
-webkit-animation-name: fade;
-webkit-animation-duration: 1.5s;
animation-name: fade;
animation-duration: 1.5s;
}
#-webkit-keyframes fade {
from {
opacity: .4
}
to {
opacity: 1
}
}
#keyframes fade {
from {
opacity: .4
}
to {
opacity: 1
}
}
<!--Slideshow of the area
================================================== -->
<section class="pictures">
<h2>Product Portfolio</h2>
<!-- Slideshow container -->
<div class="slideshow-container">
<!-- Full-width images with number and caption text -->
<div class="mySlides fade">
<img src="https://images.unsplash.com/photo-1508138221679-760a23a2285b?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1567&q=80" style="width:100%">
</div>
<div class="mySlides fade">
<img src="https://images.unsplash.com/photo-1494253109108-2e30c049369b?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=3900&q=80" style="width:100%">
</div>
<div class="mySlides fade">
<img src="https://images.unsplash.com/photo-1485550409059-9afb054cada4?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=2598&q=80" style="width:100%">
</div>
<!-- Next and previous buttons -->
<a class="prev" onclick="plusSlides(-1)">❮</a>
<a class="next" onclick="plusSlides(1)">❯</a>
</div>
<br>
<!-- The dots/circles -->
<div style="text-align:center">
<span class="dot" onclick="currentSlide(1)"></span>
<span class="dot" onclick="currentSlide(2)"></span>
<span class="dot" onclick="currentSlide(3)"></span>
</div>
</section>

It looks like your showSlides() function is setting a timeout which advances the slides. When you click your next button, another function is called, plusSlides(), which in turn calls showSlides() again. Thus, starting another timeout. The more you click the next button, the more timeouts you'll have running, and the more frequently you'll see your slides advance.
I don't have time to write the code right now, but I'd suggest killing any existing timeouts when you click the next button so you only have one running at a time.

previous button is not working in my slideshow code

I am creating slideshow code by mixing two codes of w3school example, all other things like next button are working fine. Only previous button (for loading previous image) is not working. I am debugging the JavaScript but not able to find or rectify the bug.
SlideShow ScreenShot
/slideshow.html
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" type="text/css" href="slideshow_style.css">
</head>
<body>
<!-- Slideshow container -->
<div class="slideshow-container" onmouseover="stop_timeout()" onmouseout="start_timeout()">
<!-- Full-width images with number and caption text -->
<div class="mySlides fade">
<div class="numbertext">1 / 4</div>
<img src="img_lights_wide.jpg" style="width:100%">
<div class="text">Caption Text</div>
</div>
<div class="mySlides fade">
<div class="numbertext">2 / 4</div>
<img src="img_mountains_wide.jpg" style="width:100%">
<div class="text">Caption Two</div>
</div>
<div class="mySlides fade">
<div class="numbertext">3 / 4</div>
<img src="img_snow_wide.jpg" style="width:100%">
<div class="text">Caption Three</div>
</div>
<div class="mySlides fade">
<div class="numbertext">4 / 4</div>
<img src="img_nature_wide.jpg" style="width:100%">
<div class="text">Caption Four</div>
</div>
<!-- Next and previous buttons -->
<a class="prev" onclick="plusSlides(-1)">❮</a>
<a class="next" onclick="plusSlides(1)">❯</a>
</div>
<br>
<!-- The dots/circles -->
<div style="text-align:center">
<span class="dot" onclick="currentSlide(0)"></span>
<span class="dot" onclick="currentSlide(1)"></span>
<span class="dot" onclick="currentSlide(2)"></span>
<span class="dot" onclick="currentSlide(3)"></span>
</div>
<script src="slideshow_script.js"></script>
</body>
</html>
/slideshow_script.js
var slideIndex = 0;
showSlides(slideIndex);
function plusSlides(n) {
clearTimeout(myTime);
if(n===1){showSlides(slideIndex += (n-1));}
if(n===-1){showSlides(slideIndex += n);}
clearTimeout(myTime);
}
function currentSlide(n) {
clearTimeout(myTime);
showSlides(slideIndex = n);
}
function showSlides(num) {
var i;
var slides = document.getElementsByClassName("mySlides");
var dots = document.getElementsByClassName("dot");
for (i = 0; i < slides.length; i++) {
slides[i].style.display = "none";
}
slideIndex++;
if (slideIndex > slides.length) {slideIndex = 1}
if (num > slides.length) {slideIndex = 0}
if (num < 1) {slideIndex = slides.length - 1}
for (i = 0; i < dots.length; i++) {
dots[i].className = dots[i].className.replace(" active", "");
}
slides[slideIndex-1].style.display = "block";
dots[slideIndex-1].className += " active";
myTime = setTimeout(showSlides, 3000); // Change image every 3 seconds
}
function start_timeout() {
myTime = setTimeout(showSlides, 3000); // Change image every 3 seconds
}
function stop_timeout() {
clearTimeout(myTime);
}
/slideshow_style.css
* {box-sizing:border-box}
/* Slideshow container */
.slideshow-container {
max-width: 1000px;
position: relative;
margin: auto;
}
/* Hide the images by default */
.mySlides {
display: none;
}
/* Next & previous buttons */
.prev, .next {
cursor: pointer;
position: absolute;
top: 50%;
width: auto;
margin-top: -22px;
padding: 16px;
color: white;
font-weight: bold;
font-size: 18px;
transition: 0.6s ease;
border-radius: 0 3px 3px 0;
}
/* Position the "next button" to the right */
.next {
right: 0;
border-radius: 3px 0 0 3px;
}
/* On hover, add a black background color with a little bit see-through */
.prev:hover, .next:hover {
background-color: rgba(0,0,0,0.8);
}
/* Caption text */
.text {
color: #f2f2f2;
font-size: 15px;
padding: 8px 12px;
position: absolute;
bottom: 8px;
width: 100%;
text-align: center;
}
/* Number text (1/3 etc) */
.numbertext {
color: #f2f2f2;
font-size: 12px;
padding: 8px 12px;
position: absolute;
top: 0;
}
/* The dots/bullets/indicators */
.dot {
cursor: pointer;
height: 15px;
width: 15px;
margin: 0 2px;
background-color: #bbb;
border-radius: 50%;
display: inline-block;
transition: background-color 0.6s ease;
}
.active, .dot:hover {
background-color: #717171;
}
/* Fading animation */
.fade {
-webkit-animation-name: fade;
-webkit-animation-duration: 1.5s;
animation-name: fade;
animation-duration: 1.5s;
}
#-webkit-keyframes fade {
from {opacity: .4}
to {opacity: 1}
}
#keyframes fade {
from {opacity: .4}
to {opacity: 1}
}
I know this is stupid question, but i am stuck. Please help me out, how can i make this code working. Please point out the bug. Thanks in advance.

Try replacing the line
if(n===-1){showSlides(slideIndex += n);}
with
if(n===-1){showSlides(slideIndex += (n-1));}
Also, just before the two lines
if (num > slides.length) {slideIndex = 0}
if (num < 1) {slideIndex = slides.length - 1}
add the following line:
if (slideIndex < 1) {slideIndex = slides.length; }
Also delete or comment out the two lines beginning if (num ...).
To be honest, there are aspects of your code that are confusing and are not helping you. It seems to me as if you haven't fully understood the code you have written and have just put things in because they seem to make it work.
Once you've got your code working, there's plenty of scope for writing it better. Take a look at https://codereview.stackexchange.com/.

previous button causing slideshow to disappear

I've taken a simple w3 Schools slideshow that was edited here by user Sinisake and edited the styles to remove the slide counter and caption, and edited the prev and next buttons to take up half of each side of the slide, with the cursor changing to indicate click.
The only problem is that when you click 'previous' on the first slide, the previousElementSibling is calling up an element that isn't there, and the whole slideshow disappears. I know this is happening because I changed the prev and next position, but I don't know why.
Also, I'm hiding the dots with display: none, but if I remove them from the html and javascript, the slideshow breaks.
I know a bit about CSS and html, but am very new at Javascript, so I appreciate everyone's patience and help.
My code is below, and the page is also hosted here: http://dominicfortunato.com/Template%20Studio%20Site/index-updated-slideshow-2.html
(function() {
init(); //on page load - show first slide, hidethe rest
function init() {
parents = document.getElementsByClassName('slideshow-container');
for (j = 0; j < parents.length; j++) {
var slides = parents[j].getElementsByClassName("mySlides");
var dots = parents[j].getElementsByClassName("dot");
slides[0].classList.add('active-slide');
dots[0].classList.add('active');
}
}
dots = document.getElementsByClassName('dot'); //dots functionality
for (i = 0; i < dots.length; i++) {
dots[i].onclick = function() {
slides = this.parentNode.parentNode.getElementsByClassName("mySlides");
for (j = 0; j < this.parentNode.children.length; j++) {
this.parentNode.children[j].classList.remove('active');
slides[j].classList.remove('active-slide');
if (this.parentNode.children[j] == this) {
index = j;
}
}
this.classList.add('active');
slides[index].classList.add('active-slide');
}
}
//prev/next functionality
links = document.querySelectorAll('.slideshow-container a');
for (i = 0; i < links.length; i++) {
links[i].onclick = function() {
current = this.parentNode;
var slides = current.getElementsByClassName("mySlides");
var dots = current.getElementsByClassName("dot");
curr_slide = current.getElementsByClassName('active-slide')[0];
curr_dot = current.getElementsByClassName('active')[0];
curr_slide.classList.remove('active-slide');
curr_dot.classList.remove('active');
if (this.className == 'next') {
if (curr_slide.nextElementSibling.classList.contains('mySlides')) {
curr_slide.nextElementSibling.classList.add('active-slide');
curr_dot.nextElementSibling.classList.add('active');
} else {
slides[0].classList.add('active-slide');
dots[0].classList.add('active');
}
}
if (this.className == 'prev') {
if (curr_slide.previousElementSibling.classList.contains('mySli‌des')) {
curr_slide.previousElementSibling.classList.add('active-slide');
curr_dot.previousElementSibling.classList.add('active');
} else {
slides[slides.length - 1].classList.add('active-slide');
dots[slides.length - 1].classList.add('active');
}
}
}
}
})();
/* Slideshow container */
.slideshow-container {
max-width: 80%;
position: relative;
padding-top: 3%;
padding-bottom: 2%;
margin: auto;
}
/* Next & previous buttons */
.prev, .next {
cursor: url('Images/arrow.png'), w-resize;
float: left;
position: absolute;
width: 50%;
height: 90%;
margin-right: auto;
margin-left: auto;
transition: 0.3s ease;
border-radius: 0 0px 0px 0;
}
/* Position the "next button" to the right */
.next {
cursor: url('Images/arrow.png'), e-resize;
right: 0;
border-radius: 0px 0 0 0px;
}
/* On hover, add a black background color with a little bit see-through */
.prev:hover, .next:hover {
background-color: rgba(0,0,0,0);
}
.mySlides {
display:none;
}
.active-slide {
display:block;
}
.active-slide-1 {
display:block;
}
.dot {
cursor:pointer;
height: 13px;
width: 13px;
margin: 0 2px;
background-color: #bbb;
border-radius: 50%;
display: none;
transition: background-color 0.6s ease;
}
.active, .dot:hover {
background-color: #717171;
}
/* Fading animation */
.fade {
-webkit-animation-name: fade;
-webkit-animation-duration: 0.2s;
animation-name: fade;
animation-duration: 0.2s;
}
#-webkit-keyframes fade {
from {opacity: .1}
to {opacity: 1}
}
#keyframes fade {
from {opacity: .4}
to {opacity: 1}
}
.text-container {
z-index: 300;
max-width: 80%;
float: center;
text-align: left;
position: relative;
margin-right: auto;
margin-left: auto;
padding-bottom: 2%;
font-family:"GT Walsheim", Calibri, sans-serif;
}
.project-description {
width: 100%;
font-size: 36px;
margin-left: 20px;
font-family:"GT Walsheim", Calibri, sans-serif;
display: inline;
}
.project-title {
width: 100%;
display: inline;
margin-left: 150px;
text-decoration: underline;
font-size: 36px;
}
<div class="slideshow-container">
<a class="prev" ></a>
<a class="next"></a>
<div class="mySlides fade">
<img src="http://www.w3schools.com/howto/img_mountains_wide.jpg" style="width:100%">
</div>
<div class="mySlides fade">
<img src="http://www.w3schools.com/howto/img_fjords_wide.jpg" style="width:100%">
</div>
<div class="mySlides fade">
<img src="http://www.w3schools.com/howto/img_nature_wide.jpg" style="width:100%">
</div>
<div class="mySlides fade">
<img src="http://placehold.it/1000x350" style="width:100%">
</div>
<div style="text-align:center">
<span class="dot"></span>
<span class="dot"></span>
<span class="dot"></span>
<span class="dot"></span>
</div>
</div>
<div class="text-container">
<div class="project-title">Rust Belt Riders</div>
<div class="project-description">Identity for Rust Belt Riders, a waste management and composting company from Cleveland. </div>
</div>
<br>
<div class="slideshow-container">
<a class="prev" ></a>
<a class="next"></a>
<div class="mySlides fade">
<img src="http://www.w3schools.com/howto/img_mountains_wide.jpg" style="width:100%">
</div>
<div class="mySlides fade">
<img src="http://www.w3schools.com/howto/img_fjords_wide.jpg" style="width:100%">
</div>
<div class="mySlides fade">
<img src="http://www.w3schools.com/howto/img_nature_wide.jpg" style="width:100%">
</div>
<div class="mySlides fade">
<img src="http://placehold.it/1000x350" style="width:100%">
</div>
<div style="text-align:center">
<span class="dot"></span>
<span class="dot"></span>
<span class="dot"></span>
</div>
</div>
<div class="text-container">
<div class="project-title">Rust Belt Riders</div>
<div class="project-description">Identity for Rust Belt Riders, a waste management and composting company from Cleveland. </div>
</div>
<br>

this works for me: (you may have forgotten a dot in the second slider). Check out this Fiddle: https://jsfiddle.net/prtuxoxx/
<div class="slideshow-container">
<a class="prev" ></a>
<a class="next"></a>
<div class="mySlides fade">
<img src="http://www.w3schools.com/howto/img_mountains_wide.jpg" style="width:100%">
</div>
<div class="mySlides fade">
<img src="http://www.w3schools.com/howto/img_fjords_wide.jpg" style="width:100%">
</div>
<div class="mySlides fade">
<img src="http://www.w3schools.com/howto/img_nature_wide.jpg" style="width:100%">
</div>
<div class="mySlides fade">
<img src="http://placehold.it/1000x350" style="width:100%">
</div>
<div style="text-align:center">
<span class="dot"></span>
<span class="dot"></span>
<span class="dot"></span>
<span class="dot"></span>
</div>
</div>
<div class="text-container">
<div class="project-title">Rust Belt Riders</div>
<div class="project-description">Identity for Rust Belt Riders, a waste management and composting company from Cleveland. </div>
</div>
<br>
<div class="slideshow-container">
<a class="prev" ></a>
<a class="next"></a>
<div class="mySlides fade">
<img src="http://www.w3schools.com/howto/img_mountains_wide.jpg" style="width:100%">
</div>
<div class="mySlides fade">
<img src="http://www.w3schools.com/howto/img_fjords_wide.jpg" style="width:100%">
</div>
<div class="mySlides fade">
<img src="http://www.w3schools.com/howto/img_nature_wide.jpg" style="width:100%">
</div>
<div class="mySlides fade">
<img src="http://placehold.it/1000x350" style="width:100%">
</div>
<div style="text-align:center">
<span class="dot"></span>
<span class="dot"></span>
<span class="dot"></span>
<span class="dot"></span>
</div>
</div>
<div class="text-container">
<div class="project-title">Rust Belt Riders</div>
<div class="project-description">Identity for Rust Belt Riders, a waste management and composting company from Cleveland. </div>
</div>
and JS:
(function() {
init(); //on page load - show first slide, hidethe rest
function init() {
parents = document.getElementsByClassName('slideshow-container');
for (j = 0; j < parents.length; j++) {
var slides = parents[j].getElementsByClassName("mySlides");
var dots = parents[j].getElementsByClassName("dot");
slides[0].classList.add('active-slide');
dots[0].classList.add('active');
}
}
dots = document.getElementsByClassName('dot'); //dots functionality
for (i = 0; i < dots.length; i++) {
dots[i].onclick = function() {
slides = this.parentNode.parentNode.getElementsByClassName("mySlides");
for (j = 0; j < this.parentNode.children.length; j++) {
this.parentNode.children[j].classList.remove('active');
slides[j].classList.remove('active-slide');
if (this.parentNode.children[j] == this) {
index = j;
}
}
this.classList.add('active');
slides[index].classList.add('active-slide');
}
}
//prev/next functionality
links = document.querySelectorAll('.slideshow-container a');
for (i = 0; i < links.length; i++) {
links[i].onclick = function() {
current = this.parentNode;
var slides = current.getElementsByClassName("mySlides");
var dots = current.getElementsByClassName("dot");
curr_slide = current.getElementsByClassName('active-slide')[0];
curr_dot = current.getElementsByClassName('active')[0];
curr_slide.classList.remove('active-slide');
curr_dot.classList.remove('active');
if (this.className == 'next') {
console.log('next ', curr_slide);
if (curr_slide.nextElementSibling.classList.contains('mySlides')) {
curr_slide.nextElementSibling.classList.add('active-slide');
curr_dot.nextElementSibling.classList.add('active');
} else {
slides[0].classList.add('active-slide');
dots[0].classList.add('active');
}
}
if (this.className == 'prev') {
console.log('previous ', curr_slide);
if (curr_slide.previousElementSibling.classList.contains('mySlides')) {
curr_slide.previousElementSibling.classList.add('active-slide');
curr_dot.previousElementSibling.classList.add('active');
} else {
slides[slides.length - 1].classList.add('active-slide');
dots[slides.length - 1].classList.add('active');
}
}
}
}
})();

how can i remove my slideshow width? and how can i add more number of picture in my slideshow

how can i remove my slideshow width? and how can i add more number of picture in my slideshow
i want to increase my slideshow width, and increase number of picture of myslideshow, slideshow is writtern in java, css and html.
my pics size is 1200x300.
i tried to add width in css but width increased just right side, my pic does not fit in center please help me experts.
Help Help Help
Help Help Help
Help Help Help
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
* {
box-sizing: border-box
}
body {
font-family: Verdana, sans-serif;
}
.mySlides {
display: none
}
/* Slideshow container */
.slideshow-container {
max-width: 1200px;
position: relative;
margin: auto;
}
/* Caption text */
.text {
color: #f2f2f2;
font-size: 15px;
padding: 8px 12px;
position: absolute;
bottom: 8px;
width: 100%;
text-align: center;
}
/* Number text (1/3 etc) */
.numbertext {
color: #f2f2f2;
font-size: 12px;
padding: 8px 12px;
position: absolute;
top: 0;
}
.active {
background-color: #717171;
}
/* Fading animation */
.fade {
-webkit-animation-name: fade;
-webkit-animation-duration: 1.5s;
animation-name: fade;
animation-duration: 1.5s;
}
#-webkit-keyframes fade {
from {
opacity: .4
}
to {
opacity: 1
}
}
#keyframes fade {
from {
opacity: .4
}
to {
opacity: 1
}
}
/* On smaller screens, decrease text size */
#media only screen and (max-width: 300px) {
.text {
font-size: 11px
}
}
</style>
</head>
<body>
<div class="slideshow-container">
<div class="mySlides fade">
<div class="numbertext"></div>
<img src="https://4.bp.blogspot.com/-LMLb-SRggk8/WdfQDgzmHYI/AAAAAAAAByc/UWQgh2DqSdAY5esr3-i5qmRYDFVuTh7zACLcBGAs/s1600/Flag%2B1200x300.jpg" style="width:100%">
<div class="text"></div>
</div>
<div class="mySlides fade">
<div class="numbertext"></div>
<img src="https://3.bp.blogspot.com/-lbgXjiKwfss/WdfQufxdrsI/AAAAAAAAByk/A8oJ9b3nMugIs6LIgjv04qCHAfrO-NXrACLcBGAs/s1600/Animation%2BLight%2BHouse.gif" style="width:100%">
<div class="text"></div>
</div>
<div class="mySlides fade">
<div class="numbertext"></div>
<img src="https://1.bp.blogspot.com/-6RWJYpjHqFE/WdfQ8S9RWrI/AAAAAAAAByo/OflSPE6aAKQpvWjfNUS3-lrddygVFaL6QCLcBGAs/s1600/outer%2Bspace%2Bnight%2Bstars.jpg" style="width:100%">
<div class="text"></div>
</div>
</div>
<br>
<div style="text-align:center">
<span class="dot"></span>
<span class="dot"></span>
<span class="dot"></span>
</div>
<script>
var slideIndex = 0;
showSlides();
function showSlides() {
var i;
var slides = document.getElementsByClassName("mySlides");
var dots = document.getElementsByClassName("dot");
for (i = 0; i < slides.length; i++) {
slides[i].style.display = "none";
}
slideIndex++;
if (slideIndex > slides.length) {
slideIndex = 1
}
for (i = 0; i < dots.length; i++) {
dots[i].className = dots[i].className.replace(" active", "");
}
slides[slideIndex - 1].style.display = "block";
dots[slideIndex - 1].className += " active";
setTimeout(showSlides, 2000); // Change image every 2 seconds
}
</script>
</body>
</html>

Simply remove the margin in the body and add the min-width: 100%; to the .slideshow-container.
For adding more slide just duplicate this code.
<div class="mySlides fade">
<div class="numbertext"></div>
<img src="my-image.jpg"> <!-- remove the width property from all image tag. -->
<div class="text"></div>
</div>
There is no magical width property that will set the image width to 100% you need to set the width of the container of the image and the image will expand accordingly.
Also, increase the number of <span class="dot"></span> element as you increase the slides. Because it depends on the number of slides else it will stop the js code and throw an error.
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
* {
box-sizing: border-box
}
body {
font-family: Verdana, sans-serif;
margin: 0px;
}
.widget {
margin: 0px;
}
.mySlides {
display: none
}
/* Slideshow container */
.slideshow-container {
min-width: 100%;
position: relative;
margin: auto;
}
/* Caption text */
.text {
color: #f2f2f2;
font-size: 15px;
padding: 8px 12px;
position: absolute;
bottom: 8px;
width: 100%;
text-align: center;
}
/* Number text (1/3 etc) */
.numbertext {
color: #f2f2f2;
font-size: 12px;
padding: 8px 12px;
position: absolute;
top: 0;
}
.active {
background-color: #717171;
}
/* Fading animation */
.fade {
-webkit-animation-name: fade;
-webkit-animation-duration: 1.5s;
animation-name: fade;
animation-duration: 1.5s;
}
#-webkit-keyframes fade {
from {
opacity: .4
}
to {
opacity: 1
}
}
#keyframes fade {
from {
opacity: .4
}
to {
opacity: 1
}
}
/* On smaller screens, decrease text size */
#media only screen and (max-width: 300px) {
.text {
font-size: 11px
}
}
</style>
</head>
<body>
<div class="slideshow-container">
<div class="mySlides fade">
<div class="numbertext"></div>
<img src="https://4.bp.blogspot.com/-LMLb-SRggk8/WdfQDgzmHYI/AAAAAAAAByc/UWQgh2DqSdAY5esr3-i5qmRYDFVuTh7zACLcBGAs/s1600/Flag%2B1200x300.jpg" style="width: 100%">
<div class="text"></div>
</div>
<div class="mySlides fade">
<div class="numbertext"></div>
<img src="https://3.bp.blogspot.com/-lbgXjiKwfss/WdfQufxdrsI/AAAAAAAAByk/A8oJ9b3nMugIs6LIgjv04qCHAfrO-NXrACLcBGAs/s1600/Animation%2BLight%2BHouse.gif" style="width: 100%">
<div class="text"></div>
</div>
<div class="mySlides fade">
<div class="numbertext"></div>
<img src="https://1.bp.blogspot.com/-6RWJYpjHqFE/WdfQ8S9RWrI/AAAAAAAAByo/OflSPE6aAKQpvWjfNUS3-lrddygVFaL6QCLcBGAs/s1600/outer%2Bspace%2Bnight%2Bstars.jpg" style="width: 100%">
<div class="text"></div>
</div>
<div class="mySlides fade">
<div class="numbertext"></div>
<img src="http://lorempixel.com/output/food-q-c-1200-300-3.jpg" style="width: 100%">
<div class="text"></div>
</div>
<div class="mySlides fade">
<div class="numbertext"></div>
<img src="http://lorempixel.com/output/animals-q-c-1200-300-5.jpg" style="width: 100%">
<div class="text"></div>
</div>
</div>
<br>
<div style="text-align:center">
<span class="dot"></span>
<span class="dot"></span>
<span class="dot"></span>
<span class="dot"></span>
<span class="dot"></span>
<!-- Increase the dots as you increase the slides -->
</div>
<script>
var slideIndex = 0;
showSlides();
function showSlides() {
var i;
var slides = document.getElementsByClassName("mySlides");
var dots = document.getElementsByClassName("dot");
for (i = 0; i < slides.length; i++) {
slides[i].style.display = "none";
}
slideIndex++;
if (slideIndex > slides.length) {
slideIndex = 1;
}
for (i = 0; i < dots.length; i++) {
dots[i].className = dots[i].className.replace(" active", "");
}
slides[slideIndex - 1].style.display = "block";
dots[slideIndex - 1].className += " active";
setTimeout(showSlides, 2000); // Change image every 2 seconds
}
</script>
</body>
</html>

Is this what you want?
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
* {box-sizing:border-box}
body {font-family: Verdana,sans-serif;}
.mySlides {display:none}
/* Slideshow container */
.slideshow-container {
position: relative;
margin: auto;
}
/* Caption text */
.text {
color: #f2f2f2;
font-size: 15px;
padding: 8px 12px;
position: absolute;
bottom: 8px;
width: 100%;
text-align: center;
}
/* Number text (1/3 etc) */
.numbertext {
color: #f2f2f2;
font-size: 12px;
padding: 8px 12px;
position: absolute;
top: 0;
}
.active {
background-color: #717171;
}
/* Fading animation */
.fade {
-webkit-animation-name: fade;
-webkit-animation-duration: 1.5s;
animation-name: fade;
animation-duration: 1.5s;
}
#-webkit-keyframes fade {
from {opacity: .4}
to {opacity: 1}
}
#keyframes fade {
from {opacity: .4}
to {opacity: 1}
}
/* On smaller screens, decrease text size */
#media only screen and (max-width: 300px) {
.text {font-size: 11px}
}
</style>
</head>
<body>
<div class="slideshow-container">
<div class="mySlides fade">
<div class="numbertext"></div>
<img src="https://4.bp.blogspot.com/-LMLb-SRggk8/WdfQDgzmHYI/AAAAAAAAByc/UWQgh2DqSdAY5esr3-i5qmRYDFVuTh7zACLcBGAs/s1600/Flag%2B1200x300.jpg" style="width:100%">
<div class="text"></div>
</div>
<div class="mySlides fade">
<div class="numbertext"></div>
<img src="https://3.bp.blogspot.com/-lbgXjiKwfss/WdfQufxdrsI/AAAAAAAAByk/A8oJ9b3nMugIs6LIgjv04qCHAfrO-NXrACLcBGAs/s1600/Animation%2BLight%2BHouse.gif" style="width:100%">
<div class="text"></div>
</div>
<div class="mySlides fade">
<div class="numbertext"></div>
<img src="https://1.bp.blogspot.com/-6RWJYpjHqFE/WdfQ8S9RWrI/AAAAAAAAByo/OflSPE6aAKQpvWjfNUS3-lrddygVFaL6QCLcBGAs/s1600/outer%2Bspace%2Bnight%2Bstars.jpg" style="width:100%">
<div class="text"></div>
</div>
</div>
<br>
<div style="text-align:center">
<span class="dot"></span>
<span class="dot"></span>
<span class="dot"></span>
</div>
<script>
var slideIndex = 0;
showSlides();
function showSlides() {
var i;
var slides = document.getElementsByClassName("mySlides");
var dots = document.getElementsByClassName("dot");
for (i = 0; i < slides.length; i++) {
slides[i].style.display = "none";
}
slideIndex++;
if (slideIndex > slides.length) {slideIndex = 1}
for (i = 0; i < dots.length; i++) {
dots[i].className = dots[i].className.replace(" active", "");
}
slides[slideIndex-1].style.display = "block";
dots[slideIndex-1].className += " active";
setTimeout(showSlides, 2000); // Change image every 2 seconds
}
</script>
</body>
</html>

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