First image of slideshow does not load

First image of slideshow does not load - javascript

I've just started with CSS and JavaScript, and I tried to make an image slider by looking into w3schools. The slider works, but the first image always comes empty only with the navigation bars being visible.but once I click the next button, it works fine.I'm not understanding what to change with this. Here's the code.
'use strict';
var slideIndex = 1;
function plusSlides(n) {
showSlides(slideIndex += n);
}
function currentSlide(n) {
showSlides(slideIndex = n);
}
function showSlides(n) {
//alert('showslides('+ n +')\nslideIndex='+slideIndex);
var i;
var slides = document.getElementsByClassName("mySlides");
var dots = document.getElementsByClassName("dot");
if (n === undefined) {
n = ++slideIndex;
}
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";
setTimeout(showSlides, 5000); // Change image every 5 seconds
}
* {
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;
}
/* 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
}
}
/* On smaller screens, decrease text size */
#media only screen and (max-width: 300px) {
.prev,
.next,
.text {
font-size: 11px
}
}
<body>
<?php
include './p1.php';
// put your code here
?>
<div class="slideshow-container">
<div class="mySlides fade">
<div class="numbertext">1 / 3</div>
<img src="pics/bali2.jpg" height="400px" width="800px">
<div class="text">Caption Text</div>
</div>
<div class="mySlides fade">
<div class="numbertext">2 / 3</div>
<img src="pics/brazil1.jpg" height="400px" width="800px">
<div class="text">Caption Two</div>
</div>
<div class="mySlides fade">
<div class="numbertext">3 / 3</div>
<img src="pics/germany.jpg" height="400px" width="800px">
<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>
</div>
</body>

The slider works, but the first image always comes empty only with the navigation bars being visible
Just because of you apply css this mySlides on your, so your all div not visble. When you are click on next or previous or slider so particular container are showing.
So you need to apply the style="display: block;" on your first div.
DEMO
var slideIndex = 1,
interval;
function stopAndStart() {
if (interval) {
clearInterval(interval)
}
interval = setInterval(showSlides, 5000); // Change image every 5 seconds;
}
function plusSlides(n) {
showSlides(slideIndex += n);
stopAndStart()
}
function currentSlide(n) {
showSlides(slideIndex = n);
stopAndStart()
}
function showSlides(n) {
var i,
slides = document.getElementsByClassName("mySlides"),
dots = document.getElementsByClassName("dot");
if (n === undefined) {
n = ++slideIndex;
}
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";
}
stopAndStart();
body {
font-family: Verdana, sans-serif;
margin: 0
}
.mySlides {
display: none;
text-align: center;
}
img {
vertical-align: middle;
}
/* Slideshow container */
.slideshow-container {
max-width: 1000px;
position: relative;
margin: auto;
background: burlywood;
}
/* 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;
}
/* 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
}
}
/* 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" style="display: block;">
<div class="numbertext">1 / 3</div>
<img src="https://dummyimage.com/400x400/555985/fff&text=1">
<div class="text">Caption Text</div>
</div>
<div class="mySlides fade">
<div class="numbertext">2 / 3</div>
<img src="https://dummyimage.com/400x400/555985/fff&text=2">
<div class="text">Caption Two</div>
</div>
<div class="mySlides fade">
<div class="numbertext">3 / 3</div>
<img src="https://dummyimage.com/400x400/555985/fff&text=3">
<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 active" onclick="currentSlide(1)"></span>
<span class="dot" onclick="currentSlide(2)"></span>
<span class="dot" onclick="currentSlide(3)"></span>
</div>

Related

How to make image slider respond to thumb swipe

Hi I am using the basic W3 slideshow layout but It is not very good for the mobile version of my site.
I searched very hard to find a solution to this but it's always download some plug-in to make it work or something that doesn't respond very well to swipes
$('.slider').on('touchstart', function(event) {
const xClick = event.originalEvent.touches[0].pageX;
$(this).one('touchmove', function(event) {
const xMove = event.originalEvent.touches[0].pageX;
const sensitivityInPx = 5;
if (Math.floor(xClick - xMove) > sensitivityInPx) {
$(this).slider('next');
}
else if (Math.floor(xClick - xMove) < -sensitivityInPx) {
$(this).slider('prev');
}
});
$(this).on('touchend', function() {
$(this).off('touchmove');
});
});
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
}
html,
body {
width: 100%;
height: 100%;
margin: 0;
}
body {
margin: 0;
font-family: Arial, Helvetica, sans-serif;
}
.mySlides {
display: none
}
img {
vertical-align: middle;
}
/* Slideshow container */
.slideshow-container {
padding: 10px;
max-width: 1000px;
position: relative;
margin: auto;
-webkit-overflow-scrolling: touch;
}
/* 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
}
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id="slider" class="slideshow-container">
<!-- images -->
<div class="mySlides fade">
<!-- <div class="numbertext">1 / 3</div> -->
<img src="http://upload.wikimedia.org/wikipedia/commons/7/73/Lion_waiting_in_Namibia.jpg" style="width:100%">
<div class="text">Caption Text</div>
</div>
<div class="mySlides fade">
<img src="http://upload.wikimedia.org/wikipedia/commons/7/73/Lion_waiting_in_Namibia.jpg" style="width:100%">
</div>
<div class="mySlides fade">
<img src="http://upload.wikimedia.org/wikipedia/commons/7/73/Lion_waiting_in_Namibia.jpg" style="width:100%">
</div>
<div class="mySlides fade">
<img src="http://upload.wikimedia.org/wikipedia/commons/7/73/Lion_waiting_in_Namibia.jpg" style="width:100%">
</div>
<a class="prev" onclick="plusSlides(-1)">❮</a>
<a class="next" onclick="plusSlides(1)">❯</a>
</div>
<br>
<div style="text-align:center">
<!-- dots-->
<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>

Even though this is not pure Js and it is a different approach
I found that flickity.js and css is good for mobile and it's just 2 ajax calls like jquery
https://flickity.metafizzy.co/api.html
<script src="//cdnjs.cloudflare.com/ajax/libs/flickity/1.0.0/flickity.pkgd.js"></script>
<link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/flickity/1.0.0/flickity.css">
HTML
<div class="carousel">
<div class="carousel-cell"></div>
<div class="carousel-cell"></div>
<div class="carousel-cell"></div>
<div class="carousel-cell"></div>
<div class="carousel-cell"></div>
<div class="carousel-cell"></div>
<div class="carousel-cell"></div>
<div class="carousel-cell"></div>
</div>
CSS
/* external css: flickity.css */
* { box-sizing: border-box; }
body { font-family: sans-serif; }
.carousel {
background: #FAFAFA;
}
.carousel-cell {
width: 28%;
height: 200px;
margin-right: 10px;
background: #8C8;
border-radius: 5px;
counter-increment: carousel-cell;
}
/* cell number */
.carousel-cell:before {
display: block;
text-align: center;
content: counter(carousel-cell);
line-height: 200px;
font-size: 80px;
color: white;
}
.button {
font-size: 22px;
}
.button-group {
margin-bottom: 20px;
}
Js
// external js: flickity.pkgd.js
var flkty = new Flickity( '.carousel', {
groupCells: true
});
var buttonGroup = document.querySelector('.button-group');
var buttons = buttonGroup.querySelectorAll('.button');
buttons = fizzyUIUtils.makeArray( buttons );
buttonGroup.addEventListener( 'click', function( event ) {
// filter for button clicks
if ( !matchesSelector( event.target, '.button' ) ) {
return;
}
var index = buttons.indexOf( event.target );
flkty.selectCell( index );
});

Like i wrote in the comments, you have two typos: $(this).one('touchmove and .slider, which has to be $(this).on('touchmove and #slider.
But the main problem is your function slider(), which isn't defined. But you can use the function plusSlides(), that you are already using for the next and prev buttons.
Furthermore the touchmove event is firing very often until the touchend event is fired. Therefor the function plusSlides() is called multiple times. To fix this, stop the touchmove event listener when the function plusSlides() is called.
Working example:
$('#slider').on('touchstart', function(event) {
const xClick = event.originalEvent.touches[0].pageX;
$(this).on('touchmove', function(event) {
const xMove = event.originalEvent.touches[0].pageX;
const sensitivityInPx = 5;
if (Math.floor(xClick - xMove) > sensitivityInPx) {
plusSlides(1);
$(this).off('touchmove');
}
else if (Math.floor(xClick - xMove) < -sensitivityInPx) {
plusSlides(-1);
$(this).off('touchmove');
}
});
});
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
}
html,
body {
width: 100%;
height: 100%;
margin: 0;
}
body {
margin: 0;
font-family: Arial, Helvetica, sans-serif;
}
.mySlides {
display: none
}
img {
vertical-align: middle;
}
/* Slideshow container */
.slideshow-container {
padding: 10px;
max-width: 1000px;
position: relative;
margin: auto;
-webkit-overflow-scrolling: touch;
}
/* 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
}
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id="slider" class="slideshow-container">
<!-- images -->
<div class="mySlides fade">
<!-- <div class="numbertext">1 / 3</div> -->
<img src="http://upload.wikimedia.org/wikipedia/commons/7/73/Lion_waiting_in_Namibia.jpg" style="width:100%">
<div class="text">Caption Text</div>
</div>
<div class="mySlides fade">
<img src="http://upload.wikimedia.org/wikipedia/commons/7/73/Lion_waiting_in_Namibia.jpg" style="width:100%">
</div>
<div class="mySlides fade">
<img src="http://upload.wikimedia.org/wikipedia/commons/7/73/Lion_waiting_in_Namibia.jpg" style="width:100%">
</div>
<div class="mySlides fade">
<img src="http://upload.wikimedia.org/wikipedia/commons/7/73/Lion_waiting_in_Namibia.jpg" style="width:100%">
</div>
<a class="prev" onclick="plusSlides(-1)">❮</a>
<a class="next" onclick="plusSlides(1)">❯</a>
</div>
<br>
<div style="text-align:center">
<!-- dots-->
<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>

image slide show with both automated and manual controls

The code runs quite well, the only issue i'm experiencing is that it doesn't start until its initiated with the control button. I need it to start sliding as soon as the page is loaded, I think it has to do with the display but i'm not quite sure. Kindly go through my code below and correct as appropriate i'll go to the stars and back to make sacrifices for the pandemic to be over if I get a solution
var slideIndex = 0;
var slides = document.getElementsByClassName("mySlides");
showSlides();
function showSlides() {
var i;
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, 5000); // Change image every 5 seconds
}
function currentSlide(no) {
var i;
for (i = 0; i < slides.length; i++) {
slides[i].style.display = "none";
}
slideIndex = no;
slides[no-1].style.display = "block";
}
function plusSlides(n) {
var newslideIndex = slideIndex + n;
if(newslideIndex < 4 && newslideIndex > 0){
currentSlide(newslideIndex);
}
}
* {box-sizing:border-box}
/* Slideshow container */
.slideshow-container {
max-width: 1000px;
position: relative;
margin: auto;
}
.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: 13px;
width: 13px;
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 {display: block;}
to {margin: 0;}
}
#keyframes fade {
from {opacity: .4}
to {opacity: 1}
}
<div class="slideshow-container">
<div class="mySlides fade">
<div class="numbertext">1 / 3</div>
<div style="width:100%;background-color: yellow;height:50px;"> </div>
<div class="text">Caption Text</div>
</div>
<div class="mySlides fade">
<div class="numbertext">2 / 3</div>
<div style="width:100%;background-color: black;height: 50px; "> </div>
<div class="text">Caption Two</div>
</div>
<div class="mySlides fade">
<div class="numbertext">3 / 3</div>
<div style="width:100%;background-color: blue;height: 50px;"> </div>
<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>
</div>

Slideshow images with JS and CSS showing all at once

I'm using basic code to make images slideshow but when I open the page it doesn't show up, rather only the dot buttons - which when pressed correctly show up the image. I want only 1 image to be showing when the page is opened up.
I tried tweaking the CSS which seems to be the problem.
.mySlides {
display: none;
}
When set to "none" it shows nothing but the dots, If I remove display: none; all images show together one beneath the other.
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";
}
* {
box-sizing: border-box
}
/* Slideshow container */
.slideshow-container {
width: 200px;
height: 144px;
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 {
position: relative;
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 container -->
<div class="slideshow-container">
<!-- Full-width images with number and caption text -->
<div class="mySlides fade">
<div class="numbertext">1 / 3</div>
<img src="https://loremflickr.com/100/100?lock=64" style="width:100%">
<div class="text">Caption Text</div>
</div>
<div class="mySlides fade">
<div class="numbertext">2 / 3</div>
<img src="https://loremflickr.com/100/100?lock=128" style="width:100%">
<div class="text">Caption Two</div>
</div>
<div class="mySlides fade">
<div class="numbertext">3 / 3</div>
<img src="https://loremflickr.com/100/100?lock=256" style="width:100%">
<div class="text">Caption Three</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(1)"></span>
<span class="dot" onclick="currentSlide(2)"></span>
<span class="dot" onclick="currentSlide(3)"></span>
</div>
All images showing up instead of one at a time or none at all.

Javascript - CSS Slideshow not displaying default image

I am having an issue with CSS slideshow I've implemented into my current passion-project, in which there is no default image being displayed upon load of the web-page. Upon navigation/dot press, images are successfully displayed, but I can't seem to figure out the small code snippet (presumably missing from the Javascript function) that would display the first image on page load. I've attempted to simply add the "active" class to the desired image, but this only makes the 'dot' button appear active with no corresponding image being displayed. Appreciate any assistance
Here's the code:
var slideIndex = 1;
function plusSlides(n) {
'use strict';
showSlides(slideIndex += n);
}
function currentSlide(n) {
'use strict';
showSlides(slideIndex = n);
}
function showSlides(n) {
'use strict';
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";
}
* {
box-sizing: border-box
}
body {
font-family: Verdana, sans-serif;
margin: 0
}
.mySlides {
display: none
}
/* Slideshow container */
.slideshow-container {
max-width: 400px;
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;
}
/* Position the "next button" to the right */
.next {
right: 0;
border-radius: 3px 0 0 3px;
}
/* On hover, add see-through background */
.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;
}
/* */
.transition {
cursor: pointer;
height: 13px;
width: 13px;
margin: 0 2px;
background-color: #bbb;
border-radius: 50%;
display: inline-block;
transition: background-color 0.6s ease;
}
/* */
.active,
.transition:hover {
background-color: #222;
}
/* 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) {
.prev,
.next,
.text {
font-size: 11px
}
}
<div class="homePage">
<div class="slideshow-container">
<div class="mySlides fade">
<div class="numbertext">1 / 2</div>
<img src="graphics/logo.jpg" style="width:100%">
<div class="text"></div>
</div>
<div class="mySlides fade">
<div class="numbertext">2 / 2</div>
<img src="graphics/1.jpg" style="width:100%">
<div class="text"></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="transition" onclick="currentSlide(1)"></span>
<span class="transition" onclick="currentSlide(2)"></span>
<br>
</div>

You can give another class to the first image in the slider
<div class="mySlides fade block ">
<div class="numbertext">1 / 2</div>
<img src="#" style="width:100%">
<div class="text"></div>
</div>
Then you give it a display:block
.block {
display:block;
}
Example : https://jsfiddle.net/1ueun1L1/2/

Creating a Slideshow in different files

This is the html code
<!DOCTYPE html>
<html>
<head>
<title></title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" type="text/css" href="style2.css">
<script src="learn1.js"</script>
</head>
<body>
<div class="slideshow-container">
<div class="mySlides fade">
<div class="numbertext">1 / 3</div>
<img src="learnimg/1.jpg" style="width:100%">
<div class="text">Caption Text</div>
</div>
<div class="mySlides fade">
<div class="numbertext">2 / 3</div>
<img src="learnimg/2.jpg" style="width:100%">
<div class="text">Caption Two</div>
</div>
<div class="mySlides fade">
<div class="numbertext">3 / 3</div>
<img src="learnimg/3.jpg" 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>
</div>
</body>
</html>`
This is the css code
* {box-sizing:border-box} body {font-family: Verdana,sans-serif;margin:0}
/* Slideshow container */ .slideshow-container { max-width: 1000px;
position: relative; margin: auto; }
/* Next & previous buttons */ .prev, .next { cursor: pointer;
position: absolute; top: 0; 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; }
/* 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:
13px; width: 13px; 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} }
/* On smaller screens, decrease text size */ #media only screen and
(max-width: 300px) { .slprev, .slnext,.text {font-size: 11px} }
This is the javascript code
var slideIndex = 1; showSlides(slideIndex);
function plusSlides(n) { showSlides(slideIndex += n); }
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"; }
All these 3 codes are in different files. This is basically for the creation of a simple slideshow of three images. But when I execute this(all in different files) there is nothing to display(white screen in the browser). But when executed in a single html file(all contents in a single file) there is a perfect slideshow.
I cannot figure out this problem. Please help me out with this.

This doesn't seem right :
<script src="learn1.js"</script>
You forgot to close the opening tag, as such :
<script src="learn1.js"></script>
Plus, it's always a good habit to specify your resource type :
<script type="text/javascript" src="learn1.js"></script>

The code you posted seems to work just fine.
Maybe the image files isn't where you say they are?
Try opening the console and look for errors.
var slideIndex = 1;
showSlides(slideIndex);
function plusSlides(n) {
showSlides(slideIndex += n);
}
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";
}
{
box-sizing: border-box
}
body {
font-family: Verdana, sans-serif;
margin: 0
}
/* Slideshow container */
.slideshow-container {
max-width: 1000px;
position: relative;
margin: auto;
}
/* Next & previous buttons */
.prev,
.next {
cursor: pointer;
position: absolute;
top: 0;
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;
}
/* 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: 13px;
width: 13px;
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
}
}
/* On smaller screens, decrease text size */
#media only screen and (max-width: 300px) {
.slprev,
.slnext,
.text {
font-size: 11px
}
}
<div class="slideshow-container">
<div class="mySlides fade">
<div class="numbertext">1 / 3</div>
<img src="https://placeholdit.imgix.net/~text?txtsize=60&txt=1&w=100&h=100" style="width:100%">
<div class="text">Caption Text</div>
</div>
<div class="mySlides fade">
<div class="numbertext">2 / 3</div>
<img src="https://placeholdit.imgix.net/~text?txtsize=60&txt=2&w=100&h=100" style="width:100%">
<div class="text">Caption Two</div>
</div>
<div class="mySlides fade">
<div class="numbertext">3 / 3</div>
<img src="https://placeholdit.imgix.net/~text?txtsize=60&txt=3&w=100&h=100" 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>
</div>

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