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    <p>I'd also like to chime in on this old thread, if I may, in case my solution helps anyone. My specific situation is this: I have some div's that are set with a max-height value that limits them to three lines tall, and when the user mouseovers them I want them to expand to their natural height; and when the mouse cursor leaves the div, I want them to shrink back down to the clipped, max-three-lines-tall height. I need to use the CSS max-height property, rather than height, because I have some div's that contain only one or two lines of text and I don't want them unnecessarily tall.</p> <p>I tried many of the solutions in this thread, and the one that worked for me was the 'hackish suggestion' involving cloned elements suggested by Jonathan Sampson. I translated his idea into the following code. Please feel free to suggest improvements.</p> <p>The functions are delegated to a parent element to handle div's created via an Ajax call. The <code>div.overflow_expandable</code> class has the following declaration: <code>{ max-height: 5em; overflow: hidden; }</code></p> <pre><code>$('#results').delegate('div.overflow_expandable', 'mouseenter', function() { var $this = $(this); // Close any other open divs $('#results div.overflow_expandable').not($(this)).trigger('mouseleave'); // We need to convert the div's current natural height (which is less than // or equal to its CSS max-height) to be a defined CSS 'height' property, // which can then animate; and we unset max-height so that it doesn't // prevent the div from growing taller. if (!$this.data('originalHeight')) { $this.data('originalHeight', $this.height()); $this.data('originalMaxHeight', parseInt($this.css('max-height'))); $this.css({ 'max-height':'none', height: $this.data('originalHeight') }); } // Now slide out if the div is at its original height // (i.e. in 'closed' state) and if its original height was equal to // its original 'max-height' (so when closed, it had overflow clipped) if ($this.height() == $this.data('originalHeight') &amp;&amp; $this.data('originalMaxHeight') == $this.data('originalHeight')) { // To figure out the new height, clone the original element and set // its height to auto, then measure the cloned element's new height; // then animate our div to that height var $clone = $this.clone().css({ height: 'auto', position: 'absolute', zIndex: '-9999', left: '-9999px', width: $this.width() }) .appendTo($this); $this.animate({ height: $clone.height() }, 'slow'); $clone.detach(); } }).delegate('div.overflow_expandable', 'mouseleave', function() { var $this = $(this); // If the div has 'originalHeight' defined (it's been opened before) and // if it's current height is greater than 'originalHeight' (it's open // now), slide it back to its original height if ($this.data('originalHeight') &amp;&amp; $this.height() &gt; $this.data('originalHeight')) $this.animate({ height: $this.data('originalHeight') }, 'slow'); }); </code></pre>
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    1. POHow can I Animate an Element to its natural height using jQuery
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    1. USGeoffrey Booth
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