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    <p><strong>Auto-sizing Images to Fit a Div - Making the CSS Work</strong></p> <p>Here is one way of doing it, start with the following HTML:</p> <pre><code>&lt;div class="container portrait"&gt; &lt;h4&gt;Portrait Style&lt;/h4&gt; &lt;img src="http://placekitten.com/150/300"&gt; &lt;/div&gt; </code></pre> <p>and the CSS:</p> <pre><code>.container { height: 300px; width: 240px; background-color: red; float: left; overflow: hidden; margin: 20px; } .container img { display: block; } .portrait img { width: 100%; } .landscape img { height: 100%; } </code></pre> <p>and the demo fiddle: <a href="http://jsfiddle.net/audetwebdesign/QEpJH/">http://jsfiddle.net/audetwebdesign/QEpJH/</a> </p> <p>When you have an image oriented as a portrait, you need to scale the width to 100%. Conversely, when the image is landscape oriented, you need to scale the height.</p> <p>Unfortunately, there is no combination of selectors in CSS that targets the aspect ratio of the image, so you can't use CSS to pick out the correct scaling.</p> <p>In addition, you have no easy way of centering the image since the top left corner of the image is pinned to the top left corner of the containing block.</p> <p><strong>jQuery Helper</strong></p> <p>You can use the following jQuery action to determine which class to set based on the aspect ratio of the image.</p> <pre><code>$(".container").each(function(){ // Uncomment the following if you need to make this dynamic //var refH = $(this).height(); //var refW = $(this).width(); //var refRatio = refW/refH; // Hard coded value... var refRatio = 240/300; var imgH = $(this).children("img").height(); var imgW = $(this).children("img").width(); if ( (imgW/imgH) &lt; refRatio ) { $(this).addClass("portrait"); } else { $(this).addClass("landscape"); } }) </code></pre> <p>For each image in <code>.container</code>, get the height and width, test if <code>width&lt;height</code> and then set the appropriate class.</p> <p>Also, I added a check to take into account the aspect ratio of the containing block. Before, I had implicitly assumed a square view panel.</p>
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    1. COHi. Thanks, this is working very well - great explanation, too!
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    2. COGlad to help! You can embellish the jQuery to center the image if you need to.
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    3. COHowever, the dimensions of the div are 240x300, so the simple imgW < imgH doesn't work if an image is e.g. 250x300. It should be landscape in this case, but is already handled as a portrait image. Any way to include the 4:5 ratio in that JS?
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