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POsame calculation functions, different outcomes depending on .load() and .resize() or .scroll()
 

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  1. POsame calculation functions, different outcomes depending on .load() and .resize() or .scroll()
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    <p>I'm trying to write my own lightbox script but I'm stuck on a problem.</p> <p>The <code>wrapper</code> div centering is done through <code>position: absolute</code> and top / left positioned by calculating...</p> <p>top:</p> <pre><code>_center_vertical = function() { return (($(window).height() - wrapper.height()) / 2) - (options.margin + options.border) + $(window).scrollTop() } </code></pre> <p>left:</p> <pre><code>_center_horizontal = function() { return (($(window).width() - wrapper.width()) / 2) - (options.margin + options.border) + $(window).scrollLeft() } </code></pre> <p>The <code>wrapper</code> div is centered on <code>.load()</code> and on <code>$(window).resize()</code> / <code>$(window).scroll()</code>.</p> <p>When the image is loaded and appended to <code>wrapper</code>, top and left is calculated using the functions above, horizontal centering is correct, but vertical centering is not. It is off by around 10px or more.</p> <p>When the browser window is resized or scrolled, it calls the function which animates the centering which uses the same function to calculate the top and left. The window resize / scroll does center the image properly.</p> <p>I have tried using jQuery deferred.then() to have it calculate the top / left after the image is appended, but it didn't change anything.</p> <p>Example: <a href="http://jsfiddle.net/vfMNQ/" rel="nofollow">http://jsfiddle.net/vfMNQ/</a></p> <hr> <p>I initially thought that the difference in top position changed when I played around with things like wrapper padding (aka my border), however, I found that I was wrong.</p> <p>I added some <code>console.log('image load height: ' + ((($(window).height() - wrapper.height()) / 2) - (options.margin + options.border)) + 'px')</code> to <code>.load()</code> and <code>.scroll()</code> and found that the difference was oddly 21px no matter what. The default border is 10px, margin is 30... so where did the 21 come from?</p> <p>I'd hate to use <code>+ 21</code> as a hack, but seems like nobody can figure it out.</p>
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