Tutorials

jQuery Photo Slide Show with Slick Caption Tutorial Revisited

Written by Kevin Liew on 16 Dec 2009
138,863 Views • Shares
488 comments

Introduction

If you have been reading my website from the start you would have read this tutorial:

Simple jQuery Image Slide Show with Semi Transparent Caption

It's a very famous post because it has been showcased in several major web design blogs so many times and I received a lot of traffic from it. Thanks guys. I get a lot of comment and as I replied to those comments and do some quick fixes, I realized that this script has a caption bug and inefficient and not up to standard (oh well, that's the time when I was start picking up jQuery :)), so I have decided to do revisit to solve all those problems discovered by readers. I rewrote the html structure and modify the script.

Mission Objectives:

  • Restructure the HTML, more semantic
  • Fix the caption bug, it displays the next caption too fast
  • W3C standard compliant, using appropriate attribute to store title and description
  • Cross Browser - Chrome, Safari, IE6, 7, 8 and Firefox.

However, one thing though, it needs javascript, if your browser is javascript disabled, sorry, there is no graceful degradation for this script, it will just display the first item.

Advertisement

1. HTML

Yes, I'm using list this time :) This is how it should have been afterall. No more REL attribute, we wil be using TITLE Attribute to store the heading and ALT attribute to store the description. For the caption elements, it will be added using jQuery. So, this is it - a clean and simple HTML code.

<ul class="slideshow">
	<li class="show"><a href="#"><img src="images/s1.gif" width="450" height="200" title="Slide 1" alt="Short Description"/></a></li>
	<li><a href="#"><img src="images/s2.gif" width="450" height="200" title="Slide 2" alt="Short Description"/></a></li>
	<li><a href="#"><img src="images/s3.gif" width="450" height="200" title="Slide 3" alt="Short Description"/></a></li>
</ul>

2. CSS

CSS code is rewritten completely. I guarantee it's cross browser compliant. They all look identical and it works great :) I did learn a lot of CSS technique through this blog. We all can improve our skills through tips, tricks, trials and errors. Read these posts to learn more about CSS:

body {
	font-family:arial;	
	font-size:12px;
}

ul.slideshow {
	list-style:none;
	width:450px;
	height:200px;
	overflow:hidden;
	position:relative;
	margin:0;
	padding:0;
	
}	

ul.slideshow li {
	position:absolute;
	left:0;
	right:0;
}

ul.slideshow li.show {
	z-index:500;	
}

ul img {
	border:none;	
}

#slideshow-caption {
	width:450px;
	height:70px;
	position:absolute;
	bottom:0;
	left:0;	
	color:#fff;
	background:#000;
	z-index:500;
}

#slideshow-caption .slideshow-caption-container {
	padding:5px 10px;	
	z-index:1000;	
}

#slideshow-caption h3 {
	margin:0;
	padding:0;	
	font-size:14px;
}

#slideshow-caption p {
	margin:5px 0 0 0;
	padding:0;
}

3. Javascript

We will going to use call back function to display caption. This will solve the "Caption Is Appearing Before The Next Slide Syndrome" :). Not too much of changes in javascript but I do added a feature though. On mouse over the slide will pause, and resume it back on mouse out. I think it's a good touch.

$(document).ready(function() {		
	
	//Execute the slideShow, set 4 seconds for each images
	slideShow(2000);

});

function slideShow(speed) {


	//append a LI item to the UL list for displaying caption
	$('ul.slideshow').append('
  •  
'); //Set the opacity of all images to 0 $('ul.slideshow li').css({opacity: 0.0}); //Get the first image and display it (set it to full opacity) $('ul.slideshow li:first').css({opacity: 1.0}).addClass('show'); //Get the caption of the first image from REL attribute and display it $('#slideshow-caption h3').html($('ul.slideshow li.show').find('img').attr('title')); $('#slideshow-caption p').html($('ul.slideshow li.show').find('img').attr('alt')); //Display the caption $('#slideshow-caption').css({opacity: 0.7, bottom:0}); //Call the gallery function to run the slideshow var timer = setInterval('gallery()',speed); //pause the slideshow on mouse over $('ul.slideshow').hover( function () { clearInterval(timer); }, function () { timer = setInterval('gallery()',speed); } ); } function gallery() { //if no IMGs have the show class, grab the first image var current = ($('ul.slideshow li.show')? $('ul.slideshow li.show') : $('#ul.slideshow li:first')); //trying to avoid speed issue if(current.queue('fx').length == 0) { //Get next image, if it reached the end of the slideshow, rotate it back to the first image var next = ((current.next().length) ? ((current.next().attr('id') == 'slideshow-caption')? $('ul.slideshow li:first') :current.next()) : $('ul.slideshow li:first')); //Get next image caption var title = next.find('img').attr('title'); var desc = next.find('img').attr('alt'); //Set the fade in effect for the next image, show class has higher z-index next.css({opacity: 0.0}).addClass('show').animate({opacity: 1.0}, 1000); //Hide the caption first, and then set and display the caption $('#slideshow-caption').slideToggle(300, function () { $('#slideshow-caption h3').html(title); $('#slideshow-caption p').html(desc); $('#slideshow-caption').slideToggle(500); }); //Hide the current image current.animate({opacity: 0.0}, 1000).removeClass('show'); } }

Updates

2010-09-10: Thanks to Rezzie who nailed the IE8 issue! :)

Updated the article and scripts, the link issue is fixed. :) Sorry for the delay.

Speed Issue

This is one of the issue that has been haunted me for a while, but thanks to Sam, one of our reader, he pointed out this would solve the issue, but with mixed result in IE.

Sam's solution, you need to add this:

$(window).focus(function () {
	timer = setInterval('gallery()', speed); 
});
$(window).blur(function () {
	clearInterval(timer);
});

James Burnett's solution, you modify the gallery function():

function gallery() {
	var current = ($('ul.slideshow li.show')? $('ul.slideshow li.show') : $('#ul.slideshow li:first'));

	if(current.queue('fx').length == 0) {
		
		// grab next image and animate code in here
		......
		......
		......
		
	}
}

Also, did some research, found the reason why it's doing it: From jQuery Animate Documentation: Because of the nature of requestAnimationFrame(), you should never queue animations using a setInterval or setTimeout loop. In order to preserve CPU resources, browsers that support requestAnimationFrame will not update animations when the window/tab is not displayed. If you continue to queue animations via setInterval or setTimeout while animation is paused, all of the queued animations will begin playing when the window/tab regains focus. To avoid this potential problem, use the callback of your last animation in the loop, or append a function to the elements .queue() to set the timeout to start the next animation.

Sorry guys, I don't have time to put all these together. Please let me know it works.

Randomize Slides

Simple yet effective solution from another reader - Blastos

Before the ending of function slideShow(), put this in:

//Generate a random number
var randNum = Math.floor(Math.random() * $('ul.slideshow li').length);

//Randomly pick up a slide
$('ul.slideshow li:eq('+randNum+')').addClass('show');

Caption doesn't appear for the first slide

I think it has to be the ommitted A tag for some users. Ammended the script, it should be fixed now.

Conclusion

I have made a lot of tutorials, and I think it's good to do a revisit to make it more efficient and solve some of the annoying bugs instead of quick fixes. So, yea, from now on, I will check my previous tutorials and rewrite them. :)

Like this tutorials? You can express your gratitude by visiting my sponsors on the sidebar, bookmark it and help me to spread this tutorial to our friends! :) Thanks!

Demo Download
Join the discussion

Comments will be moderated and rel="nofollow" will be added to all links. You can wrap your coding with [code][/code] to make use of built-in syntax highlighter.

488 comments
Nate 7 years ago
Hi,

I am having a problem with this script. It works beautifully in every browser for me except IE (naturally...).

The problem is that it is only displaying about 30% of the images for my scroller in IE.

I had it working in IE until I validated my HTML and moved a DOCTYPE above the page. I then added another jquery effect as you can see by visiting. The effect is a loading bar when you visit the website.

Is there any way for me to make these two work together?

I don\'t understand why. If you can help, please respond as soon as you can. Thanks by the way. Lovely script!
Reply
Nate 7 years ago
btw the web address is
www.jdit.us
Reply
Ed 7 years ago
Hey! Thx for the code, but I\'m having problems with the title of the 3rd picture! I tried this thing that the person below me said.. but it\'s still the same.. HELP please!
Reply
Ben 7 years ago
Works perfectly and very easy to implement, however I can\'t get it to validate:
I get the error \"document type does not allow element \"li\" here\" which is referring to <li class=\"show\"> - is there any way to fix this without changing the doctype?
Reply
Ash 7 years ago
May I ask, If I wanted to make the h3 titles of the captions links INSTEAD of making the image a link how would I modify the javascript to do that?

Aslo I think there is a left over comment n your code from a previous version:

//Get the caption of the first image from REL attribute and display it

I believe that no longer happens and now its pulling from the title and alt attributes?
Reply
kevin Admin 7 years ago
Hi all, sorry for the really late reply as I was away during this holiday. I have fixed the wrong link and title issue. It was caused by the z-index. So, I fixed it by setting z-index to 500 in show class in the CSS and also z-index 1000 for the caption class.
Reply
kevin Admin 7 years ago
@Ash: I think you just have to edit the html.

- remove the A tag wrapped around the image and in the title of each image, you will have to add A tag like title=\"<a href=\'http://www.queness.com \'>Slide 2</a>\"

it should work.
Reply
kevin Admin 7 years ago
@Jim Dresser: hmmm, unfortunately, I don't have the chance to test it on IE8. But I do have a quick fix if you don't mind. You can force IE8 to render the content as IE7.

<meta http-equiv="X-UA-Compatible" content=";IE=EmulateIE7"/>

I hope it helps.
Reply
Jim Dresser 7 years ago
Great slideshow, but it doesn\'t work in IE8. After slide #1 is displayed, the image will advance to the second slide, but the caption doesn\'t change - the caption on slide #2 is the caption for slide #1. Can this be fixed? The problem exists on your site.
Reply
Ash 7 years ago
This tut is fabulous, than you, but it seems to use the same link for each image regardless of what the link is. For example if you have 3 images each with a separate url In the source code it is showing the right urls, but on the front end it seems as if only one url is clickable, always the last one in the series and the same for every slide. for example clicking on slide one two or three always takes you to slide 3\\\\\\\'s page
Reply
Ben 7 years ago
Ash 7 years ago
Brilliant, Thanks. And no worries about taking so long. Its holidays! I should be thanking you for getting to it so fast.
Reply
kevin Admin 7 years ago
@Ben! yep, it\'s valid now. I have added

/* <![CDATA[ */
javascript code
/* ]]> */

it\'s 100% w3c compliant :)

@Ash: :p... yea, a great break from work.

happy new year to all of you!
Reply