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POLooped jQuery slideshow with smooth cross-fades
 

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  1. POLooped jQuery slideshow with smooth cross-fades
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    <p>I'm trying to do a simple rotating image on the home page. Under the hood I'm reading a directory and then populating urls for the images into an array. What I want to do is cross-fade the images. If it was just a matter of showing the next one, it's easy, but since I need to cross-fade, it's a bit harder. I think what I want to do is do the fades by calling <code>animate()</code> on the <code>opacity</code> value of the <code>&lt;img&gt;</code> tag, and in between swapping out the css <code>background-image</code> property of the enclosing <code>&lt;div&gt;</code>. But the results are not that great. </p> <p>I've used tools for more full featured slideshows, but I don't want the overhead of adding a plugin if I can avoid it, and a simple crossfade seems like it should be easier.</p> <p>Here's my JavaScript (I'm using jQuery 1.3.2):</p> <pre><code>var slideshow_images = ["http:\/\/example.com\/wordpress\/wp-content\/themes\/testtheme\/sidebar-home-bg\/bg1.jpg","http:\/\/example.com\/wordpress\/wp-content\/themes\/testtheme\/sidebar-home-bg\/bg2.jpg","http:\/\/example.com\/wordpress\/wp-content\/themes\/testtheme\/sidebar-home-bg\/bg3.jpg"]; var slideshow_index = 0; var delay = 4000; var swapSlides = function() { var slideshow_count = slideshow_images.length; // initialize the background to be the current image $('#home-slideshow').css({ 'background-image': 'url(' + slideshow_images[slideshow_index] + ')', 'background-repeat:': 'no-repeat', 'width': 200, 'overflow': 'hidden' }); slideshow_index = ((slideshow_index + 1) == slideshow_count) ? 0 : slideshow_index + 1; // fade out the img $('#home-slideshow img').animate({opacity: 0}, delay); // now, the background is visible // next change the url on the img $('#home-slideshow img').attr('src', slideshow_images[slideshow_index]); // and fade it up $('#home-slideshow img').animate({opacity: 1.0}, delay); // do it again setTimeout('swapSlides()', 4000); } jQuery(document).ready(function(){ if (swapSlides) { swapSlides(); } }); </code></pre> <p>And here's the markup I'm using:</p> <pre><code>&lt;div id="home-slideshow"&gt;&lt;img src="http://example.com/wordpress/wp-content/themes/testtheme/sidebar-home-bg/bg1.jpg" alt="" /&gt;&lt;/div&gt; </code></pre>
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