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    <p>Seems like there is no build in tools to get this value. But we can calculate it. Assume that the line-height in textarea is a known value (you can explicitly define it in css). So the code to calculate the number of rows would like this:</p> <pre><code> var area = $('#myarea').get(0); //save the initial height of textarea var initialHeight = area.style.height; //set the height to 0 so scrollHeight will always return dynamic height area.style.height = '0px'; //here we assume that the line-height equals to 15 var numberOfRows = Math.floor(area.scrollHeight / 15); //restore textarea height area.style.height = initialHeight; console.log(numberOfRows); </code></pre> <p>Working example <a href="http://jsfiddle.net/J5UpF/" rel="nofollow">http://jsfiddle.net/J5UpF/</a></p> <p><strong>UPDATE</strong></p> <p>Just figured out the bug in Chrome with my code. I didn't take into account the scrollbar that appears on the right side of textarea. That leads to the wrong number of lines calculated sometimes. However it works like a charm in Firefox. To fix this issue we have to calculate the difference of scrollbars width and adjust the width of textarea accordingly:</p> <pre><code>var area = $('#myarea').get(0); var $area = $('#myarea'); //save the initial height of textarea var initialHeight = area.style.height; var scrollbarWidthInitial = area.offsetWidth - area.clientWidth; //set the height to 0 so scrollHeight will always return dynamic height area.style.height = '0px'; var scrollbarWidth = area.offsetWidth - area.clientWidth; var scrollbarWidthDiff = scrollbarWidth - scrollbarWidthInitial; $area.width($area.width() + scrollbarWidthDiff); //here we assume that the line-height equals to 15 var numberOfRows = Math.floor(area.scrollHeight / 15); //restore textarea height area.style.height = initialHeight; $area.width($area.width() - scrollbarWidthDiff); console.log(numberOfRows); </code></pre> <p>updated example <a href="http://jsfiddle.net/J5UpF/3/" rel="nofollow">http://jsfiddle.net/J5UpF/3/</a></p> <p><strong>UPDATE 2</strong></p> <p>A new awesome bug in Chrome is discovered! When using <code>placeholder</code> attribute Chrome calculates the number of rows for placeholder text. The workaround is simple: just backup the placeholder attribute when you entered some data into textarea and restore it when data is cleared.</p> <p>Updated example <a href="http://jsfiddle.net/J5UpF/4/" rel="nofollow">http://jsfiddle.net/J5UpF/4/</a></p>
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    1. PORead new-lines in textarea BEFORE submitting form?
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    1. COWould you mind posting a working jsfiddle example with this? Tried the solution (quickly) but couldn't get it to work? :)
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    2. COUpdated the answer with jsFiddle
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    3. COWorks splendid! Thank you! - Marked as answer
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A row detail

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