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POPreloading images using PHP and jQuery - Comma separated array?
 

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  1. POPreloading images using PHP and jQuery - Comma separated array?
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    <p>So I'm building a website that will use a lot of animated GIF's on mouse hover. There will be a lot of images, and I only want to load the images that will be used on any given page. It's using WordPress so I can use the conditional tags to only put out the URL's of the images I need on a certain page.</p> <p>My problem was how to tell the browser/server which images needed to be preloaded. I decided to add a HTML5 data attribute to the containing element.</p> <p>For example, I would have a DIV with this PHP in it:</p> <pre><code>&lt;div id="home-container" class="preload" data-preload="&lt;?php echo preloadImages(); ?&gt;"&gt;&lt;/div&gt; </code></pre> <p>Which would call this function in PHP:</p> <pre><code>function preloadImages() { global $post; $templateURL = get_template_directory_uri(); $images = array(); if( is_page('test') ) $images[] = "'".$templateURL."/images/gifs-static/button-info-tab-close-off.gif'"; $images[] = "'".$templateURL."/images/gifs-animated/button-info-tab-close.gif'"; } return implode(", ", $images); } </code></pre> <p>So the output would be this:</p> <pre><code>&lt;div id="home-container" class="preload" data-preload="'http://example.com/images/gifs-static/button-info-tab-close-off.gif', 'http://example.com/images/gifs-animated/button-info-tab-close.gif'"&gt;&lt;/div&gt; </code></pre> <p>And then I run this JavaScript:</p> <pre><code>jQuery('.preload').each(function(){ var images = [ // Comma separated list jQuery(this).data('preload') ]; jQuery(images).each(function() { jQuery('&lt;img /&gt;').attr('src', this).addClass('preloaded').appendTo('body').hide(); }); }); </code></pre> <p>The problem is that the JavaScript does not like the comma separated list. If I just write in the URLs, it works fine. So is there a better way to pass in those URLs? Or a better way in general?</p>
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