1. HTML
My ultimate objective is - to keep the html as simple as possible. So, the final product is as following. The first image has a class called "show". Class show has higher z-index, so image with this class will display on top, thus image with this class will always display on top of the rest. The second thing you need to know is the DIV with "caption" class. It has the highest z-index. That DIV will be used to display the caption. The caption is retrieve from the REL attribute in the img element. You can put html element in the REL attribute. Be aware of extra padding and margin of the html elements you used. (eg h1, p).
Have a look at the html code:
<div id="gallery">
<a href="#" class="show">
<img src="images/flowing-rock.jpg" alt="Flowing Rock" alt="" title="" width="580" height="360" rel="<h3>Flowing Rock</h3>You can put html element
inside the REL attribute."/></a>
</a>
<a href="#">
<img src="images/grass-blades.jpg" alt="Grass Blades" alt="" title="" width="580" height="360" rel="<h3>Grass Blades</h3>description"/>
</a>
......
......
......
<div class="caption"><div class="content"></div></div>
</div>
<div class="clear"></div>
2. CSS
In this section, I declared a container #gallery for this image slide show. The CSS for this tutorial is pretty straight foward, the most importance thing is the z-index. You have to make sure the "show" class z-index is lower than the "caption" z-index
body{
font-family:arial
}
.clear {
clear:both
}
#gallery {
position:relative;
height:360px
}
#gallery a {
float:left;
position:absolute;
}
#gallery a img {
border:none;
}
#gallery a.show {
z-index:500
}
#gallery .caption {
z-index:600;
background-color:#000;
color:#ffffff;
height:100px;
width:100%;
position:absolute;
bottom:0;
}
#gallery .caption .content {
margin:5px
}
#gallery .caption .content h3 {
margin:0;
padding:0;
color:#1DCCEF;
}
3. Javascript
Finally, the Javascript code. I have added comments in each line to explain what it does. My concept for this image slide show:
Hide all the images
Display the first image and caption
Find the image with "show" class, and grab the next image using next() method
Add "show" class to next image
Animate the image (fadeout the current image, fadein next image)
And, it repeats above steps over and over again
$(document).ready(function() {
//Execute the slideShow
slideShow();
});
function slideShow() {
//Set the opacity of all images to 0
$('#gallery a').css({opacity: 0.0});
//Get the first image and display it (set it to full opacity)
$('#gallery a:first').css({opacity: 1.0});
//Set the caption background to semi-transparent
$('#gallery .caption').css({opacity: 0.7});
//Resize the width of the caption according to the image width
$('#gallery .caption').css({width: $('#gallery a').find('img').css('width')});
//Get the caption of the first image from REL attribute and display it
$('#gallery .content').html($('#gallery a:first').find('img').attr('rel'))
.animate({opacity: 0.7}, 400);
//Call the gallery function to run the slideshow, 6000 = change to next image after 6 seconds
setInterval('gallery()',6000);
}
function gallery() {
//if no IMGs have the show class, grab the first image
var current = ($('#gallery a.show')? $('#gallery a.show') : $('#gallery a:first'));
//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().hasClass('caption'))? $('#gallery a:first') :current.next()) : $('#gallery a:first'));
//Get next image caption
var caption = next.find('img').attr('rel');
//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 current image
current.animate({opacity: 0.0}, 1000)
.removeClass('show');
//Set the opacity to 0 and height to 1px
$('#gallery .caption').animate({opacity: 0.0}, { queue:false, duration:0 }).animate({height: '1px'}, { queue:true, duration:300 });
//Animate the caption, opacity to 0.7 and heigth to 100px, a slide up effect
$('#gallery .caption').animate({opacity: 0.7},100 ).animate({height: '100px'},500 );
//Display the content
$('#gallery .content').html(caption);
}
Finish
Download Source File here
