Develop Reference

Javascript not hiding button on last image

I have a JSFiddle that shows my code now:
https://jsfiddle.net/qtu1xgw3/2/
Basically there is an image button (pink flower) and then there are 4 images that change when the button is clicked.
Now the issue is that I want the button to hide when I get to the last image. Right now I need to click the button twice to get it to hide on the last image. But I want with the last click of the button to hide it at the same time that the last image in the gallery is shown.
One of the images is in the html part of the code, which might be what causes this issue, I think, but I'm not sure how to do this differently without breaking the code?
(random images from google used for the sake of testing)
HTML:
<div class="test">
<div class="desc">
<h2 id="title_text">test1</h2>
<p id="under_text">test2</p>
</div>
<div id="pink">
<img src="https://images.vexels.com/media/users/3/234325/isolated/lists/cba2167ec09abeeee327ffa0f994151b-detailed-flower-illustration.png" onclick="imagefun()"></div>
<div class="game">
<img src="https://images.vexels.com/media/users/3/143128/isolated/lists/2a84565e7c9642368346c7e6317fa1fa-flat-flower-illustration-doodle.png" id="getImage"></div>
</div>
CSS:
.game img {
width: 300px;
height: auto;
}
.test {
display: flex;
flex-direction: row;
}
JS:
var counter = 0,
gallery = ["https://cdn.cloudflare.steamstatic.com/steamcommunity/public/images/apps/914750/aab494aa7cde1991d0a86cc28ec6debdbee37d7f.jpg", "https://api.assistivecards.com/cards/gardening/flowers.png", "https://i.pinimg.com/474x/7d/10/75/7d1075cf259131c942037683d2243bb0.jpg"],
imagefun = function () {
if (counter >= gallery.length) {
document.getElementById("title_text").innerHTML = "test3"; document.getElementById("under_text").innerHTML = "test4"; document.getElementById("pink").style.display = "none";
}
else{
document.getElementById("getImage").src = gallery[counter];
counter++;
}
};

I have made some change to your code. It will help you.
var counter = 0,
gallery = ["https://cdn.cloudflare.steamstatic.com/steamcommunity/public/images/apps/914750/aab494aa7cde1991d0a86cc28ec6debdbee37d7f.jpg", "https://api.assistivecards.com/cards/gardening/flowers.png", "https://i.pinimg.com/474x/7d/10/75/7d1075cf259131c942037683d2243bb0.jpg"],
imagefun = function () {
if (counter == gallery.length -1) {
document.getElementById("getImage").src = gallery[counter];
document.getElementById("pink").style.display = "none";
}
else{
document.getElementById("getImage").src = gallery[counter];
counter++;
}
};

try this
Evaluate when the counter is equal to the size of your array if so then do the job you want
imagefun = function () {
if(counter==gallery.length)
{
document.getElementById("getImage").style.display = "none";
}
if (counter >= gallery.length) {
document.getElementById("title_text").innerHTML = "test3";
document.getElementById("under_text").innerHTML = "test4";
document.getElementById("pink").style.display = "none";
}
else{
document.getElementById("getImage").src = gallery[counter];
counter++;
}
};

The issue is that you increment your counter after the counter >= gallery.length check.
The correct solution is:
const gallery = [
"https://cdn.cloudflare.steamstatic.com/steamcommunity/public/images/apps/914750/aab494aa7cde1991d0a86cc28ec6debdbee37d7f.jpg",
"https://api.assistivecards.com/cards/gardening/flowers.png",
"https://i.pinimg.com/474x/7d/10/75/7d1075cf259131c942037683d2243bb0.jpg",
];
let counter = 0;
document.getElementById("getImage").src = gallery[counter];
function imagefun() {
counter += 1;
document.getElementById("getImage").src = gallery[counter];
if (counter >= gallery.length - 1) {
document.getElementById("title_text").innerHTML = "test3";
document.getElementById("under_text").innerHTML = "test4";
document.getElementById("pink").style.display = "none";
}
};

Slider Counter Not Incrementing

My slider is allowing for content to go forwards and backwards when the Next/Previous links are clicked. When I switch the contentType to 'div' it only shows content in slides 1 and 3. Could someone please explain why the counter is not incrementing properly? Is there a more effecient way to do this? I have included my code below as well as a working example. The purpose of this script is to allow for images or content to be displayed in a slide. Any help is much appreciated!
$(document).ready(function() {
// VARIABLE DECLARATIONS
var $el = $('#showcase');
var $leftArrow = $('#left_arrow');
var $rightArrow = $('#right_arrow');
var contentType = $('div'); // change to img and reverse comment out HTML code
var slideCount = $el.children().length;
var slideNum = 1;
var $load = $el.find(contentType)[0];
// PRELOADS SLIDE WITH CORRECT SETTINGS
$load.className = 'active';
$leftArrow.addClass("disabled");
// CHECKS FOR FIRST AND LAST INDEX
function checkSlide() {
if (slideNum == 1) {
$leftArrow.addClass('disabled');
} else {
$leftArrow.removeClass('disabled');
}
if (slideNum == slideCount) {
$rightArrow.addClass('disabled');
} else {
$rightArrow.removeClass('disabled');
}
}
// NAVIGATIONAL LOGIC FOR PREVIOUS/NEXT BUTTONS
$leftArrow.click(function() {
if (slideNum > 1) {
var counter = $(".active").index();
counter--;
$('.active').addClass('slide');
$('.active').removeClass('active');
contentType.eq(counter).addClass('active');
slideNum--;
checkSlide();
console.log('slideNum: ' + slideNum);
console.log('counter: ' + counter);
}
})
$rightArrow.click(function() {
if (slideNum < slideCount) {
var counter = $(".active").index();
counter++;
$('.active').addClass('slide');
$(".active").removeClass('active');
contentType.eq(counter).addClass('active');
slideNum++;
checkSlide();
console.log('slideNum: ' + slideNum);
console.log('counter: ' + counter);
}
})
});
img {
width: 160px;
}
a {
color: blue;
}
.disabled {
color: red !important;
}
.slide {
display: none;
}
.active {
display: block;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<!-- <div id="showcase">
<img class="slide" src="https://picsum.photos/458/354" />
<img class="slide" src="https://picsum.photos/458/354/?image=306" />
<img class="slide" src="https://picsum.photos/458/354/?image=626" />
</div>
« Previous
Next » -->
<div id="showcase">
<div class="slide">Page 1 content</div>
<div class="slide">Page 2 content</div>
<div class="slide">Page 3 content</div>
</div>
« Previous
Next »

The issue is that your "contentType" var, which matches divs, also matches the "showcase" div, so you are getting 4 in your list, not 3 as you expect. In your left/right arrow click handlers, replace:
contentType.eq(counter).addClass('active');
with:
$el.find(contentType).eq(counter).addClass('active');

setInterval loop not working

I am creating a simple image slide with JavaScript, but when I loop through all the images, I can not reset the loop:
var images = document.querySelectorAll(".slide-img");
var index = 0;
var time = 1000;
function reset(){
for(var i = 0; i <= 3; i++){
images[i].style.display = 'none';
images[0].style.display = 'block';
}
}
reset();
var looper = setInterval(function(){
index++;
images[index].style.display = 'block';
if(index == 3){
index = 0;
images[index].style.display = 'block';
//or calling reset() again.
}
}, 1000);
After setting all the image display:noneexcept the first one, I tried calling setInterval for looping all my images, but problem occurs when the index is 3. I am calling the reset() function and it is not working?

Your code has a few problems.
The code inside the if statement doesn't reset all the images to hidden. So you would need to call reset function instead
Your reset function doesn't reset the index.
You should set index 0 to block once, and then loop through the rest instead of setting index 0 to block in each iteration.
Because you reset when index == 3, you will never see the last image. You should reset on the following iteration to ensure that each image is visible for one second.
See my example below.
var images = document.querySelectorAll(".slide-img");
var index = 0;
var time = 1000;
function reset(){
index = 0;
images[0].style.display = 'block';
for(var i = 1; i < images.length; i++){
images[i].style.display = 'none';
}
}
reset();
setInterval(function(){
index++;
if(index >= images.length){
reset();
} else {
images[index].style.display = 'block';
}
}, 1000);
.container {
display: flex;
}
.slide-img {
width: 100px;
height: 100px;
}
<div class="container">
<div class="slide-img" style="background: red"></div>
<div class="slide-img" style="background: blue"></div>
<div class="slide-img" style="background: green"></div>
<div class="slide-img" style="background: purple"></div>
</div>
If you have other question on why my code is different than yours, ask in the comments. But I think the code should be clear and understandable.

JS: Slideshow inaccurate result

Hi I write this simple javascript slideshow cause I want to write my own slideshow in javascript. It automatically change the images by a set time interval. But when I try to click the backward and forward function the result is not accurate or the images are in order.
var images = ["http://i1214.photobucket.com/albums/cc487/myelstery/1.jpg","http://i1214.photobucket.com/albums/cc487/myelstery/2.jpg","http://i1214.photobucket.com/albums/cc487/myelstery/3.jpg"];
var i = 0;
var count = images.length;
function slidingImages()
{
i = i % count;
document.banner.src = images[i];
i++;
}
function forward()
{
i = (i + 1) % count;
document.banner.src=images[i];
}
function backward()
{
if (i <= 0)
{
i = count - 1;
}
else
{
i--;
}
document.banner.src=images[i];
}
window.onload = function()
{
slidingImages(),setInterval(slidingImages, 3000)
};
<center>
<p>
<img src="images/1.jpg" name="banner" id="name"/>
</p>
<input type="button" value="«prev" onClick="backward()">
<input type="button" value="next»" onClick="forward()">
</center>
What is the solution so my slideshow would be accurate?

This will pause the automatic behavior when the mouse is within the red rectangle and continue in auto mode once the mouse is out of the red rectangle. The buttons of course work as expected.
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<style>
fieldset { width: -moz-fit-content; width: -webkit-fit-content; width: fit-content; border: 1px solid red; }
</style>
</head>
<body>
<section>
<p>
<img src="images/1.jpg" name="banner" id="name"/>
</p>
<fieldset id="control">
<input id="prev" type="button" value="◄">
<input id="next" type="button" value="►">
</fieldset>
</section>
<script>
var images = ["http://i1214.photobucket.com/albums/cc487/myelstery/1.jpg","http://i1214.photobucket.com/albums/cc487/myelstery/2.jpg","http://i1214.photobucket.com/albums/cc487/myelstery/3.jpg"];
var i = -1;
var count = images.length;
var prev = document.getElementById('prev');
var next = document.getElementById('next');
var control = document.getElementById('control');
var autoSlide;
window.onload = auto;
function auto() {
autoSlide = setInterval(fwd, 3000) };
function pause() {
clearInterval(autoSlide);
}
function fwd() {
if (i >= 0 && i < 2)
{
i += 1;
}
else
{
i = 0;
}
document.banner.src=images[i];
}
function rev() {
if (i > 0 && i <= 2)
{
i -= 1;
}
else
{
i = 2;
}
document.banner.src=images[i];
}
prev.addEventListener('click', function() {
rev();
}, false);
next.addEventListener('click', function() {
fwd();
}, false);
control.addEventListener('mouseover', function() {
pause();
}, false);
control.addEventListener('mouseout', function() {
auto();
}, false);
</script>
</body>
</html>

Change div's hover state with jQuery timer

I’m a complete jquery newb and I want to create 5 classes(.button1 - .button5) with a timer which toggles the next classes :hover or :active state every 4000ms on a continuous loop. I also want the ability for the timer to halt and continue if another one of the classes is hovered on by the user. Does anyone know of a good starting point or a thread with a similar solution?
I’ve attached a diagram.
CSS
.wrapper { width:100%; margin:0 auto; background:#f3f3f3; }
#buttonblock { display:block; }
.button1, .button2, .button3, .button4, .button5 { display:inline-block; margin:0 5px; height:50px; width:50px; border-radius:25px; background:#3cc8dd; }
.button1:hover, .button2:hover, .button3:hover, .button4:hover, .button5:hover{ background:#fbc040; }
HTML
<div class="wrapper">
<div id="buttonblock">
<div class="button1"></div>
<div class="button2"></div>
<div class="button3"></div>
<div class="button4"></div>
<div class="button5"></div>
</div>
</div>

you can simply loop over the array of objects, for example
var $block = $('#buttonblock div');
for (var n=0; n<$block.length; n++)
{
var domELM = $block[n]; // you can do $(domELM) to create a jquery of the dom
// do stuff here, set interval or whatever it is you wish to do.
if(n == $block.elngth)
n=0; //resets the loop
}

HTML
<div class="wrapper">
<div id="buttonblock">
<div class="button button1"></div>
<div class="button button2"></div>
<div class="button button3"></div>
<div class="button button4"></div>
<div class="button button5"></div>
</div>
css
.hover {
background:#fbc040;
}
js
var counter = 1;
var timer;
$(document).ready(function () {
startTimer();
$('.button').mouseenter(function () {
$('.hover').removeClass('hover');
clearInterval(timer);
});
$('.button').mouseleave(function () {
startTimer();
});
});
function startTimer() {
timer = setInterval(function () {
counter = (counter > 5) ? 1 : counter;
$('.hover').removeClass('hover');
$('.button' + counter).addClass('hover');
counter++;
}, 4000);
}
JSFiddle

Try this
var divs = $('#buttonblock').children('div'),
number = divs.length,
currentIndex = 0,
intervalLength = 2000;
function setTimer() {
divs.removeClass('hover');
divs.eq(currentIndex).addClass('hover');
currentIndex++;
if (currentIndex == number) {
currentIndex = 0;
}
}
setTimer();
var timer = setInterval(setTimer, intervalLength);
divs.mouseenter(function () {
clearInterval(timer);
divs.removeClass('hover');
var div = $(this);
div.addClass('hover');
currentIndex = divs.index(div);
}).mouseleave(function () {
timer = setInterval(setTimer, intervalLength);
});
Example - setInterval
or using setTimeout