Created
March 6, 2011 07:46
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An easy way to rotate images in a slideshow via jQuery
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| <html> | |
| <head> | |
| <title>Simple Slideshow</title> | |
| <style type='text/css'> | |
| #slideshow { position: relative; } | |
| #slideshow img { position: absolute; top: 0; left: 0; } | |
| </style> | |
| <script src="jquery.js" type="text/javascript"></script> | |
| <script type="text/javascript"> | |
| var image_counter = -1; | |
| $(window).load(function() { | |
| rotate_images(); | |
| setInterval(rotate_images, 7000); | |
| }); | |
| function rotate_images() { | |
| var images = $('#slideshow img'); | |
| image_counter = ++image_counter % images.length; | |
| images.each(function(i, img) { | |
| if (i == image_counter) { | |
| $(img).css({zIndex : 4}); | |
| $(img).animate({ opacity : 1 }, 2000).animate({ zIndex : 5}, 200); | |
| } else { | |
| $(img).animate({ opacity : 0 }, 2000).animate({ zIndex : 0}, 200); | |
| } | |
| }); | |
| } | |
| </script> | |
| </head> | |
| <body> | |
| <div id="slideshow"> | |
| <img src="image1.jpg" alt=""> | |
| <img src="image2.jpg" alt=""> | |
| <img src="image3.jpg" alt=""> | |
| <img src="image4.jpg" alt=""> | |
| </div> | |
| </body> | |
| </html> | |
Thanks for the input! The first suggestion I will implement. My only concern with the second one is the edge case of someone leaving the browser open for a very long time. I have a slight issue with cases where the counter goes on to infinity.
I believe you mixed up the ++ operator, though on the first one: it needs to go before. :)
Ah, good spot. The second case, however, won't go to infinity. The x = x % y patterns assigns back to x in every loop, so image_counter will always stay inside [0..image_counter).
Haha! My turn to miss something. Very good.
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Very nice! But your use of ++ can go to the next level. Delete line 19, and change line 20 to read:
However, in the case of a rotating counter, I would actually replace lines 19-22 with: