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POComparing boundary points between ranges
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Id
11020545
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CreationDate
2012-06-13T17:52:15.517
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2012-06-14T09:34:11.327
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Body
I don't know if the title is right. The thing is that I have found a snippet to get the cursor position when it's focused in a contenteditable element. I understand the whole code, but there are five lines that I do no t know for what they are good. Ok. This lines are a function, which is passed to a Treewalker as a parameter. And they deal with comparing boundary points, but, how, and for what?. I have been researching lot of days, and haven't found ists functionality yet. <pre><code>function(node) { var nodeRange = document.createRange(); nodeRange.selectNode(node); return nodeRange.compareBoundaryPoints(Range.END_TO_END, range) < 1 ? NodeFilter.FILTER_ACCEPT : NodeFilter.FILTER_REJECT; } </code></pre> The whole snippet is this (just to situate it in context): <pre><code>function getCharacterOffsetWithin(range, node) { var treeWalker = document.createTreeWalker( node, NodeFilter.SHOW_TEXT, function(node) { var nodeRange = document.createRange(); nodeRange.selectNode(node); return nodeRange.compareBoundaryPoints(Range.END_TO_END, range) < 1 ? NodeFilter.FILTER_ACCEPT : NodeFilter.FILTER_REJECT; }, false ); var charCount = 0; while (treeWalker.nextNode()) { charCount += treeWalker.currentNode.length; } if (range.startContainer.nodeType == 3) { charCount += range.startOffset; } return charCount; } document.body.addEventListener("keyup", function() { var el = document.getElementById("test"); var range = window.getSelection().getRangeAt(0); document.getElementById("position").innerHTML = "Caret char pos: " + getCharacterOffsetWithin(range, el); }, false); </code></pre> It can be seen on work here: <a href="http://jsfiddle.net/timdown/2YcaX/3/" rel="nofollow">JS Fiddle</a> Thank you a lot, I just want to understand this stuff before working with it. Sorry for the long Post.
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<javascript><contenteditable>
Title
Comparing boundary points between ranges
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1. PO
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1. USKenedy
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