I know this question is maybe a bit boring. But I'm searching now for serveral hours and find no way to combine the solutions I found on the Internet.
So I hope someone here would like to help me out.
I have a simple Image slider and I need a counter that says maybe "Image 2 of 3".
As I said, there are a lot of solutions on the internet but I'm not able to implement them to my code.
This is the code Im working with:
HTML
<div class="slider">
<img src="http://placehold.it/250x500" class="active"/>
<img src="http://placehold.it/200x500" />
<img src="http://placehold.it/100x500" />
</div>
<!-- ARROW AND COUNTER -->
<div>
<img src="assets/img/arrow-prev.png" class="prev" alt="Prev Arrow"/>
<span id="counter"></span>
<img src="assets/img/arrow-next.png" class="next" alt="Next Arrow"/>
</div>
CSS
.slider{
height: 51vh;
overflow: hidden;
}
.slider img{
display: none;
height: 51vh;
}
.slider img.active{
display: inline-block;
}
.prev, .next{
cursor: pointer;
}
JAVASCRIPT
$(document).ready(function () {
$('.next').on('click', function () {
var currentImg = $('.active');
var nextImg = currentImg.next();
if (nextImg.length) {
currentImg.removeClass('active').css('z-index', -10);
nextImg.addClass('active').css('z-index', 10);
}
});
$('.prev').on('click', function () {
var currentImg = $('.active');
var prevImg = currentImg.prev();
if (prevImg.length) {
currentImg.removeClass('active').css('z-index', -10);
prevImg.addClass('active').css('z-index', 10);
}
});
});
It would be really great if someome can help me!
So basically you should just keep track of all images and the index of the currently displayed image. Something like the code below could do that.
$(document).ready(function () {
// Get images.
var images = $('.slider > img');
// Set starting index.
var index = images.index($('.active'));
$('#counter').text((index + 1) + ' of ' + images.length);
$('.next').on('click', function () {
var currentImg = $('.active');
var nextImg = currentImg.next();
if (nextImg.length) {
currentImg.removeClass('active').css('z-index', -10);
nextImg.addClass('active').css('z-index', 10);
// Find the index of the image.
var index = images.index(nextImg);
$('#counter').text((index + 1) + ' of ' + images.length);
}
});
$('.prev').on('click', function () {
var currentImg = $('.active');
var prevImg = currentImg.prev();
if (prevImg.length) {
currentImg.removeClass('active').css('z-index', -10);
prevImg.addClass('active').css('z-index', 10);
// Find the index of the image.
var index = images.index(prevImg);
$('#counter').text((index + 1) + ' of ' + images.length);
}
});
});
Link to jsfiddle example.
Explanation: I've added a index variable that checks the active class position:
var index = images.index($('.active'));
$('#counter').text("Image " + (index + 1) + ' of ' + images.length);
Working code:
So Have a look at this code because this should work fine!
$(document).ready(function() {
var images = $('.slider > img');
var index = images.index($('.active'));
$('#counter').text("Image " + (index + 1) + ' of ' + images.length);
$('.next').on('click', function() {
var currentImg = $('.active');
var nextImg = currentImg.next();
if (nextImg.length) {
currentImg.removeClass('active').css('z-index', -10);
nextImg.addClass('active').css('z-index', 10);
var index = images.index(nextImg);
$('#counter').text("Image " + (index + 1) + ' of ' + images.length);
}
});
$('.prev').on('click', function() {
var currentImg = $('.active');
var prevImg = currentImg.prev();
if (prevImg.length) {
currentImg.removeClass('active').css('z-index', -10);
prevImg.addClass('active').css('z-index', 10);
var index = images.index(prevImg);
$('#counter').text("Image " + (index + 1) + ' of ' + images.length);
}
});
});
.slider {
height: 51vh;
overflow: hidden;
}
.slider img {
display: none;
height: 51vh;
}
.slider img.active {
display: inline-block;
}
.prev,
.next {
cursor: pointer;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="slider">
<img src="https://placehold.it/450x500/red" class="active" />
<img src="https://placehold.it/450x500/r" />
<img src="https://placehold.it/450x500" />
</div>
<!-- ARROW AND COUNTER -->
<div>
<img src="https://placehold.it/50/red" class="prev" alt="Prev Arrow" />
<span id="counter"></span>
<img src="https://placehold.it/50/blue" class="next" alt="Next Arrow" />
</div>
I hope this is the solution you have expected. For any further questions to my answer - let me know :)
Without jQuery, just plain javascript.
With css opacity transition.
https://jsfiddle.net/uatthqjp/3/
const $images = document.querySelectorAll('img');
// `Array.from` for backward compatibility
// to convert `$images` into a real array
// so you can use `forEach` method on it
// use in conjunction with a polyfill
// for example: www.polyfill.io
const images = Array.from($images);
const $buttons = document.querySelector('.buttons');
// counter for current img
let current = 0;
// listen to click events on `$buttons` div
$buttons.addEventListener('click', function(e){
// loop through all images
images.forEach(function(img){
// hide all images
img.classList.remove('active');
});
// if the current clicked button
// contain the class "next"
if (e.target.classList.contains('next')) {
// increment counter by 1
current++;
// reset the counter if reach last img
if (current >= images.length) {
current = 0;
}
// show current img
images[current].classList.add('active');
}
// if the current clicked button
// contain the class "prev"
else {
// decrease counter by 1
current--;
// if "prev" is pressed when first img is active
// then go to the last img
if (current < 0) {
current = images.length - 1;
}
// show current img
images[current].classList.add('active');
}
});
img {
position: absolute;
top: 40px;
opacity: 0; /* hide images */
transition: opacity 1s ease-in-out;
}
.active {
opacity: 1;
}
<img class="active" src="https://dummyimage.com/100x100/e62020/fff&text=IMG1" alt="img1">
<img src="https://dummyimage.com/100x100/20e679/fff&text=IMG2" alt="img2">
<img src="https://dummyimage.com/100x100/4120e6/fff&text=IMG3" alt="img3">
<div class="buttons">
<button class="prev">Prev</button>
<button class="next">Next</button>
</div>
If you look for the easiest solution there is one. All that code added by other users look difficult for me. You can add simple html code with text to each slide and write "1/4", "2/4" etc. Even if you have 10 slides it may be easier than to implement huge jquery or javascript.
The example can be found here W3Schools slideshow
Another very common solution is to use bullet navigator. Many global companies use this solution because it is very easy to understand for everybody. Example - if you have 5 slides you have 5 bullets in the center bottom part of an image. If slide #3 is visible at the moment, third bullet changes color to indicate that you are on slide #3.
There are a few websites that create the entire html/css/js for sliders and you can customize it as you want.
Example of a page: Jssor.com
Related
I have 30 images that make together a full turn of a 3D model. I want to display the animation in browser. I can not use CSS animation, which otherwise worked good. The problem with JavaScript is flickering when the next image loads. Is there any way to make it smoother?
<div id="image" style="width: 1920px; height: 1080px;">
</div>
<script>
let suffix;
let i = 0;
let image = document.getElementById("image");
function setSuffix(){
suffix = ("0" + (i+1)).slice(-2);
i++;
i = i % 30;
image.style.background = "URL('" + suffix + ".jpg')";
}
setInterval(setSuffix, 1000);
</script>
Perhaps you can use a supplemental image, load it, then bring it to the front using z-index. Something like:
let suffix;
let i = 0;
let image1 = document.getElementById("image1");
let image2 = document.getElementById("image2");
// TIP: Remove these
let url1 = "https://scontent-iad3-1.xx.fbcdn.net/v/t1.0-9/41667401_10155851253461762_5185170392754421760_n.png?_nc_cat=101&oh=beb534388a04dd5ea101bc9560fa5e24&oe=5C1F4FAD";
let url2 = "https://scontent-iad3-1.xx.fbcdn.net/v/t1.0-9/34661720_10155632057856762_4698625317663670272_n.jpg?_nc_cat=106&oh=dd89a8d15e587dba4b7fe8b3ea38143e&oe=5C1E5CC0";
function setSuffix(){
// TIP: Uncomment this
//imageUrl = ("0" + (i+1)).slice(-2) + ".jpg";
if (i % 2 === 0) {
imageUrl = url1; // TIP: Remove this.
image1.style.background = `URL('${imageUrl}')`;
image1.style.zIndex = "1";
image2.style.zIndex = "0";
} else {
imageUrl = url2; // TIP: Remove this.
image2.style.background = `URL('${imageUrl}')`;
image2.style.zIndex = "1";
image1.style.zIndex = "0";
}
i++;
}
setInterval(setSuffix, 1000);
#image1, #image2{
position:absolute;
top: 0px;
left: 0px;
}
<div id="image1" style="width: 1920px; height: 1080px;"></div>
<div id="image2" style="width: 1920px; height: 1080px;"></div>
i have image gallery ant i set up setinterval, now i want that it should be stopped after two or tree circle.
This is my html Code:
<div id="slider">
<img src="http://imgsrc.hubblesite.org/hu/gallery/db/spacecraft/24/formats/24_web.jpg">
<img src="http://imgsrc.hubblesite.org/hu/gallery/db/spacecraft/27/formats/27_web.jpg">
<img src="http://imgsrc.hubblesite.org/hu/gallery/db/spacecraft/32/formats/32_web.jpg">
<img src="http://imgsrc.hubblesite.org/hu/gallery/db/spacecraft/33/formats/33_web.jpg">
</div>
css:
#slider {
width: 400px;
height: 300px;
position: relative;
overflow: hidden
}
#slider img {
position: absolute;
top: 0;
left: 0;
opacity: 0;
transition: 0.25s
}
and Javascript:
var pics;
var current = 0; // first next() moves to pics[0], the first image
window.addEventListener("load", function() {
pics = document.querySelectorAll("#slider img");
});
setInterval(function() {
var nextImage = (current + 1) % pics.length;
pics[current].style.opacity = 0;
pics[nextImage].style.opacity = 1;
current = nextImage;
}, 3000);
Here's your answer: Stop setInterval call in JavaScript
Save the interval ID when you create it, keep track of the number of times your slides have rotated, and then cancel the interval.
Use a counter variable to track the number of cycles & clear the timer based on that limit value.
JS Code:
var counter = 0;
var limit = 3 ;
var timer;
timer =setInterval(function () {
if(counter === 3){
clearInterval(timer);
return;
}
counter++;
//do some stuff here after 1 second delay
},1000);
You could use setTimeout instead.
var pics;
var current = 0; // first next() moves to pics[0], the first image
var stop = 3; //define when you want to stop
window.addEventListener("load", function() {
pics = document.querySelectorAll("#slider img");
});
function switchImage()
{
var nextImage = (current + 1) % pics.length;
pics[current].style.opacity = 0;
pics[nextImage].style.opacity = 1;
current = nextImage;
stop--;
if(stop != 0)
setTimeout(switchImage,3000);
}
setTimeout(switchImage,3000);
You can do like this.
var refreshIntervalId = setInterval(function() {
var nextImage = (current + 1) % pics.length;
pics[current].style.opacity = 0;
pics[nextImage].style.opacity = 1;
current = nextImage;
}, 3000);
clearInterval(refreshIntervalId);
My div goes right but when i click again should be back to its original location.....
i tried many stuff but not working.Here is my code...
How do i reverse it when clicked. on every click it should be the reverse of the previous action i.e.
if on click the div moves right then on next click at the same location it should move left similar to a pendulum
<html>
<head><title></title>
<script type="text/javascript" language="javascript">
//<![CDATA[
window.onload=function()
{
document.getElementById("d2").onclick = slideIt;
};
function slideIt()
{
var slidingDiv = document.getElementById("d1");
var stopPosition = 50;
if (parseInt(slidingDiv.style.left) < stopPosition )
{
slidingDiv.style.left = parseInt(slidingDiv.style.left) + 2 + "px";
setTimeout(slideIt, 1);
}
/*
if(parseInt(slidingDiv.style.left) > stopPosition )
{
slidingDiv.style.left = parseInt(slidingDiv.style.left) + 2 + "px";
setTimeout(slideIt, 1);
}*/
}
//]]>
</script>
</head>
<body>
<div id="d1" style="position:absolute; left:-131px;">
<div style=" float:left" >click here to slide the div</div>
<div id="d2" style=" float:left" >click here to slide the div</div> </div>
</body>
</html>
Change your JavaScript with this one
<script type="text/javascript" language="javascript">
$(document).ready(function(){ $("#d2").click(function(){
if($("#d1").css("left") <="-131px")
{
$("#d1").animate({left:'250px'});
}
else {
$("#d1").animate({left:'-131px'});
}
});
});
</script>
This will work fine
Good Luck..
Okay, so here's how I have done things...
DEMO: http://jsfiddle.net/xDDX8/2/
HTML
<div id="d1">
<div id="d2">click here to slide the div</div>
</div>
CSS
#d1 {
position: absolute;
border: 1px solid red;
cursor: pointer;
left: 0;
}
.moveLeft {
color: blue;
}
.moveRight {
color: lime;
}
Javascript
window.onload = bindEvents();
function bindEvents() {
document.getElementById('d2').onclick = slideIt;
}
// Global variables
var slidingDiv = document.getElementById('d1'); // Cache the element
var timeout = 0;
var minPosition = 0;
var maxPosition = 50;
function slideIt() {
// Work out current position
var currentPosition = slidingDiv.offsetLeft;
// Check which direction to move
if (hasClass(slidingDiv, 'moveRight'))
{
// Have we hit our movement limit?
if (currentPosition <= minPosition)
{
// remove all classes and set a class to move the other direction
slidingDiv.removeAttribute('class');
slidingDiv.setAttribute('class', 'moveLeft');
// Clear our timeout
clearTimeout(timeout);
}
else
{
// Still space to move so let's move a few pixels (-)
slidingDiv.style.left = (currentPosition - 2) + "px";
timeout = setTimeout(slideIt, 1);
}
}
else // all comments as above really
{
if (currentPosition >= maxPosition)
{
slidingDiv.removeAttribute('class');
slidingDiv.setAttribute('class', 'moveRight');
clearTimeout(timeout);
}
else
{
slidingDiv.style.left = (currentPosition + 2) + "px";
timeout = setTimeout(slideIt, 1);
}
}
}
// Function to test whether an element has a specific class
// https://stackoverflow.com/questions/5898656/test-if-an-element-contains-a-class
function hasClass(element, cls) {
return (' ' + element.className + ' ').indexOf(' ' + cls + ' ') > -1;
}
I have a simple image rotator script that I'm trying to build but I am having trouble learning scope as it relates to getting variables into and out of JavaScript functions.
Here is my code:
<script type="text/javascript">
jQuery(document).ready(function($) {
function indexUp () {
if (slide_curr == slide_max - 1) {
slide_curr = slide_max;
slide_prev = slide_max - 1;
slide_next = slide_min;
} else if (slide_curr == slide_max) {
slide_curr = slide_min;
slide_prev = slide_max;
slide_next = slide_min + 1;
} else {
slide_curr = slide_next;
slide_prev = slide_curr - 1;
slide_next = slide_curr + 1;
}
}
function doTransition () {
// turn on the display of the next slide
$(slides[slide_next]).css('display','block');
// fade the current slide out (to zero opacity)
$(slides[slide_curr]).fadeOut(600, function() {});
}
function printState () {
var state_str = 'slide_curr='
+ slide_curr
+ '; slide_prev='
+ slide_prev
+ '; slide_next='
+ slide_next
+ '; slide_max='
+ slide_max
+ '; slide_min='
+ slide_min;
$('#bx_state').html(state_str);
}
function doIt () {
doTransition();
indexUp();
printState();
}
// variables
var slides = $('#bx_slider img');
var slide_min, slide_max, slide_curr, slide_prev, slide_next;
// initialize the settings
slide_min = 0;
slide_max = slides.length - 1;
slide_curr = 0;
slide_prev = slide_max;
slide_next = 1;
// start it all off when the page loads
$(slides[slide_curr]).css('display','block');
timeout = setTimeout(doIt, 3000);
});
</script>
<style type='text/css'>
#bx_slider img {
display:none; position:absolute;}
#bx_slider {
width:922px; height:530px; margin:100px auto;
position:relative;}
</style>
<div id="bx_slider">
<img src="slide1.jpg" />
<img src="slide2.jpg" />
<img src="slide3.jpg" />
<img src="slide4.jpg" />
<img src="slide5.jpg" />
</div><!-- #bx_slider -->
<div id='bx_state'></div>
I'm trying to get the slide_curr, slide_next, and slide_prev to change each time the script is run and then print those out to the page in the div tag in an effort to see what is going on; however, even that is not working for me.
Here is the script in action: http://www.exit44.com/slider/
Thanks for the help.
I'm guessing here, but perhaps the problem has nothing to do with variable scope. You mention that you want to create a "simple image rotator". Try changing
timeout = setTimeout(doIt, 3000);
to
timeout = setInterval(doIt, 3000);
I have the following javascript. It works well when I am cycling between 2 images, but when I add a third it does not work correctly.
Here is my CSS:
img {
-webkit-transition-property: opacity;
-webkit-transition-duration: 2s;
position: absolute;
width: 320px;
height: auto;
}
img.fade-out {
opacity: 0;
}
img.fade-in {
opacity: 1;
}
Here is my javascript, which seems to work but seems laggy and definately not an elegant solution.
</head><body style="color: black">
<img id="one" class="fade-out" src="Wallpaper.png"/>
<img id="two" class="fade-out" src="Wallpaper0.png"/>
<img id="three" class="fade-out" src="Wallpaper1.png"/>
<script>
var images = ['Wallpaper.png', 'Wallpaper0.png', 'Wallpaper1.png'];
var index = 0;
var fade_in = one;
var fade_out = two;
var fade_foo = three;
fade_in.src = images[0];
fade_out.src = images[images.length - 1];
var fade = function () {
fade_in.src = images[index];
index = (index + 1) % images.length;
fade_in.className = 'fade-out';
fade_out.className = 'fade-in';
fade_foo.className = 'fade-out';
var fade_tmp = fade_in;
fade_in = fade_out;
fade_out = fade_foo;
fade_foo = fade_tmp;
setTimeout(fade, 15000);
};
fade();
</body></html>
For one thing, you're not changing fade_out.src. Try something like this:
fade_in.src = images[0];
fade_out.src = images[1]; // let's use image next to current for fade-out
var fade = function () {
fade_in.src = images[index];
index = (index + 1) % images.length;
fade_out.src = images[index]; // put next to current image into fade-out
// Code below does something misterious.
// You first switch classes between two img's, then switch variables themselves
// Why?
//fade_in.className = 'fade-out';
//fade_out.className = 'fade-in';
//var fade_tmp = fade_in;
//fade_in = fade_out;
//fade_out = fade_tmp;
setTimeout(fade, 15000);
};
Can't tell more since I don't know what exactly you're doing.
It seems you're only displaying one image at a time, so you don't need two variables, one will do. You just need to fade out the current image and bring in a new image:
var index = -1, count = /* total number of images */;
var image = null;
function fade() {
if (image != null)
image.className = 'fade-out';
index = (index + 1) % count;
image = document.getElementById('image-' + index);
image.className = 'fade-in';
setTimeout(fade, 15000);
}
fade();
This assumes that you have set up all the images in HTML as follows:
<img id="image-0" class="fade-out" src="..." />
<img id="image-1" class="fade-out" src="..." />
<img id="image-2" class="fade-out" src="..." />
...
Note that you can achieve cross-fading only if you have several images preloaded, as in the above example. If you use only one image and change the source, the previous image will be lost when you try to fade in the new one.
you're not waiting for you transitions to finish before you swap the source. we just need to rearrange the order of things.
var fade = function() {
fade_in.className = 'fade-out';
fade_out.className = 'fade-in';
setTimeout(function() {
index = (index + 1) % images.length;
fade_in.src = images[index]; // should be completely invisible at this time
var fade_tmp = fade_in;
fade_in = fade_out;
fade_out = fade_tmp;
}, 2000); // 2 seconds, same as your transition time
setTimeout(fade, 15000);
};
setTimeout(fade, 15000);
here the only work that the fade method does is to change the classes, which initiates the transitions. we set a delay that matches your transition time to update the index and swap the image source.
edits: i guess i'm not making it clear what's going on and the assumptions i'm making. here's my complete html except for the provided css which is the same. i also fixed an issue with image order since the last example.
<body>
<img id="one" class="fade-out" /><img id="two" class="fade-out" />
<script>
var images = ['16jog8h.jpg', '20_11_2007_0044537001195507712_joe_baran.jpg', '400davesrig.jpg'];
var index = 0;
var fade_in = document.getElementById('one');
var fade_out = document.getElementById('two');
// fade_in.src = images[0];
fade_out.src = images[0];
var fade = function() {
fade_in.className = 'fade-out';
fade_out.className = 'fade-in';
setTimeout(function() {
index = (index + 1) % images.length;
fade_in.src = images[index];
var fade_tmp = fade_in;
fade_in = fade_out;
fade_out = fade_tmp;
}, 2000);
setTimeout(fade, 5000);
};
fade();
</script>
</body>