I have seen a lot of users requesting for simple jQuery scripts for SlideShows. I saw a couple of them, but the scripts assumed that the number of image tags has to be fixed beforehand.
The code given below is taken from my eBook “51 Recipes with jQuery and ASP.NET Controls”.
Note: This code was written when jQuery 1.3.2 was the latest version available. Currently we have jQuery 1.4.2 available.
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title>Simple Image SlideShow</title>
<link href="../CSS/Demos.css" rel="stylesheet" type="text/css" />
<script type='text/javascript'
src='../Scripts/jquery-1.3.2.min.js'>
</script>
<script type="text/javascript">
$(function() {
var imgs = [
'../images/1.jpg',
'../images/2.jpg',
'../images/3.jpg',
'../images/4.jpg'];
var cnt = imgs.length;
var $imageSlide = $('img[id$=imageSlide]');
// set the image control to the last image
$imageSlide.attr('src', imgs[cnt-1]);
setInterval(Slider, 3000);
function Slider() {
$imageSlide.fadeOut("slow", function() {
$(this).attr('src', imgs[(imgs.length++) % cnt])
.fadeIn("slow");
});
}
});
</script>
</head>
<body>
<form id="form1" runat="server">
<div class="smallDiv">
<h2>Image Slide Show - Image Changes Every 3 Seconds</h2><br />
<asp:Image ID="imageSlide" runat="server" class="imgdiv" />
</div>
</form>
</body>
</html>
This recipe shows you how to create a simple image slideshow that works in modern browsers. This example starts by declaring an array containing image paths. We have declared an image control on the page. When the page loads, the image path of this control is set to the last element of the array. I will explain shortly why this is needed.
var $imageSlide = $('img[id$=imageSlide]');
// set the image control to the last image
$imageSlide.attr('src', imgs[cnt-1]);
We then use the JavaScript setInterval() function which delays execution of the Slider function for a specific time, in our case 3000 millisecond(3 seconds). The advantage of a setInterval() function is that it continues to repeat the process of triggering the function at a specified interval, thereby sliding the images in a cycle. If you want to pause the slideshow, use the clearInterval() function.
Note: Since the Slider function is first called after a 3 seconds delay, hence we explicitly set the image control source to the last image path in the array. If we do not do so, the user does not see an image for the first 3 seconds.
With every loop, we set the image control source to the next element in the array using the expression imgs[(imgs.length++) % cnt] and apply the fadeIn() and fadeOut() effect.
function Slider() {
$imageSlide.fadeOut("slow", function() {
$(this).attr('src', imgs[(imgs.length++) % cnt])
.fadeIn("slow");
});
}
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12 comments:
I think this is the right idea. I have not tested, the following comments.
1. The call to imgs.length++ will increment this value every 3 seconds. You will lose the intent of the variable. Seems like you want to have a copy (var index = imgs.length for instance) and then increment that variable.
2. The setInterval option does not take into consideration the load time of the images. If for example, it takes 2.5 seconds to load, then the image will be shown for 0.5 seconds. This will occur during the initial caching of the images.
I think you have a bug here.
I'm using Firefox 3.5.8.
When I open live demo for the first time (images not cached) when fade in occures it shows old picture for a short time.
I wouldn't call it a bug. In the book, I have mentioned a plugin that caches images before it can be used, and yes as you suggest, that's the way to go. My intention here was to focus on creating a simple image slide show.
I saw a couple of them, but the scripts assumed that the number of image tags has to be fixed beforehand.
I am very grateful for this article. Have a website in need of an article and time to digest this script. Thanks Devcurry!
Not working properly
Tried this on my site, then I realized that with each picture fade it acts like it's refreshing the page, and scrolls to the top of the page.
Anybody know how to stop it?
Preload the images to stop refresh like behavior
function preload(arr) {
$(arr).each(function(){
$('img/>')[0].src = this;
});
}
preload([
'img/1.jpg',
'img/2.jpg',
'img/3.jpg'
]);
How do I stop the slideshow at the last slide?
How would i be able to populate the array by just simply put all images in the root without providing name.
Is there anyway to add a play pause button>?
Is there anyway to add a play and pause button
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