Created
July 16, 2018 17:51
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Visit all Text nodes in Range (JavaScript)
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//Range definition https://www.w3.org/TR/DOM-Level-2-Traversal-Range/ranges.html | |
function visitTextNodesInRange(range, visitor) { | |
var reachedStartNode = false, reachedEndNode = false, | |
startContainer = range.startContainer, endContainer = range.endContainer, | |
startOffset = range.startOffset, endOffset = range.endOffset; | |
var visitNode = function (node, visitor) { | |
var isTextNode = node.nodeType === Node.TEXT_NODE; | |
if (isTextNode) { | |
if (node === startContainer && node === endContainer) { | |
visitor(node, startOffset, endOffset); | |
} else if (node === startContainer) { | |
visitor(node, startOffset, node.nodeValue.length); | |
} else if (node === endContainer) { | |
visitor(node, 0, endOffset); | |
} else if (reachedStartNode) { | |
visitor(node, 0, node.nodeValue.length); | |
} | |
} | |
var startIndex = node === startContainer && !isTextNode ? startOffset : 0; | |
var endIndex = node === endContainer && !isTextNode ? endOffset : node.childNodes.length; | |
reachedStartNode = reachedStartNode || node === startContainer; | |
for (var i = startIndex; !reachedEndNode && i < endIndex; ++i) { | |
visitNode(node.childNodes[i], visitor); | |
} | |
reachedEndNode = reachedEndNode || node === endContainer; | |
}; | |
visitNode(range.commonAncestorContainer, visitor); | |
} | |
//Example usage: mask selected text with some placeholder | |
function maskSelectedText() { | |
var visitor = function(textNode, startOffset, endOffset) { | |
var value = textNode.nodeValue; | |
var result = value.substring(0, startOffset); | |
result += value.substring(startOffset, endOffset).replace(/[^\x00-\x7F]|\w/gim, '*'); | |
result += value.substring(endOffset); | |
textNode.nodeValue = result; | |
}; | |
if(window.getSelection && window.getSelection().rangeCount) { | |
visitTextNodesInRange(window.getSelection().getRangeAt(0), visitor); | |
window.getSelection().removeAllRanges(); | |
} | |
} |
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