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POTest if cursor is on the first line in a textarea (with soft-newlines)
 

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    <p>Given a textarea with content that flows like this</p> <pre> –––––––––––––––––––––––––– | This is some text, which | | wraps like this. | –––––––––––––––––––––––––– </pre> <p>How can one tell if the text-cursor is on the first line of the textarea?</p> <p>Obviously, checking for a newline character (<code>\n</code>) works if one wants to see if the cursor appears before the first line break, but testing for a 'soft' line break seems more challenging.</p> <p>Here is a sample <a href="http://jsfiddle.net/bmh_ca/h46jh/26/" rel="nofollow">jsFiddle to experiment with</a>.</p> <p>I have not yet come up with a strategy, but I suspect it may involve copying the text up until the cursor position into a cloned textarea (or div), and making the width as long as it needs to be so it doesn't wrap. If the cloned area has a width less than the original's width, then the cursor would seem to have to be on the first line. There may a simpler option, something more elegant, or (best of all) an existing and well-tested solution.</p> <p>Target browsers are Webkit (Chrome/Safari) &amp; Firefox. I.e. IE compatibility is not a concern at this time (if that makes any difference).</p> <p>Thanks for reading.</p> <h3>EDIT: Seeking line number of text caret, not mouse cursor.</h3> <p>falsarella gave an excellent answer, that highlighted an ambiguity in the question. What I am seeking is whether the text cursor (“caret” may be a better word) is on the first line. I have updated the question and <a href="http://jsfiddle.net/bmh_ca/h46jh/26/" rel="nofollow">the jsFiddle</a> to reflect.</p>
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    1. USBrian M. Hunt
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      1. USJonas G. Drange
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    1. COWhile searching on the SO I found these two questions which might be helpful to you, although not sure whether you've already seen them or not http://stackoverflow.com/questions/9370197/caret-position-cross-browser http://stackoverflow.com/questions/4928586/get-caret-position-in-html-input
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    2. COIgnore my previous comment please, I misunderstood the question
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