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    <p>I'll suppose the DOM in your example is an effective example of the actual complexity of your DOM, and that a "line-boxe" is just a line of text.</p> <p>1-2) For every <code>&lt;span&gt;</code> inside the <code>&lt;div&gt;</code>, you can count the number of lines they span with something like this:</p> <pre><code>var spans = div.getElementsByTagName("span"), spandata = []; for (var i = 0; i &lt; spans.length; i++) { var rects = spans[i].getClientRects(); if (i &gt; 0) if (rects[0].bottom &gt; obj.rects[obj.rects - 1].bottom) var inirow = obj.lastRow + 1; else var inirow = obj.lastRow; var obj = { element: spans[i], rects: rects, iniRow: inirow, lastRow: inirow + rects.length - 1 }; spandata.push(obj); } </code></pre> <p>Now <code>spandata</code> is a list of all the data you want about the <code>&lt;span&gt;</code> elements. I'm also supposing that each one of them may span through more than one line.</p> <p>Keep in mind that <code>getClientRects</code> has some issues in IE&lt;8.</p> <p>3) In modern browsers, the <code>getSelection</code> method can help you:</p> <pre><code>var sel = window.getSelection(); if (sel.type === "Caret") var span = sel.anchorNode.parentNode; </code></pre> <p>About the line position, I must say it's not an easy task. You can't easily get the page position of the caret. The simplest thing you can do is to place a dummy inline element in the place of the caret:</p> <pre><code>var text = sel.anchorNode.nodeValue; sel.anchorNode.nodeValue = text.substring(0, sel.anchorOffset); var dummy = document.createElement("i"); span.appendChild(dummy); var pos = dummy.getBoundingClientRect(); sel.anchorNode.nodeValue = text; span.removeChild(dummy); </code></pre> <p><code>pos</code> contains the info of the position of the caret. Now you have to compare them with the rect infos about the span:</p> <pre><code>var rects = span.getClientRects(); for (var i = 0; i &lt; rects.length; i++) if (rects[i]].bottom === pos.bottom) break; if (i &lt; rects.length) { for (var i = 0; i &lt; spandata.length; i++) { if (spandata[i].element === span) { var line = spandata[i].iniRow + i; break; } } } </code></pre> <p>In the end, if <code>line != null</code>, it contains the line of the caret.</p> <p>Man, that was complicated...</p>
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    1. COIts not complicated http://jsfiddle.net/SJ2T7/
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    2. CONo, if you want to keep things simple and eventually not responding to the answer...
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    3. CO@MaxArt Thank you a lot for your answer. I will study it right now.
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