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Get previous node.

/ Published in: JavaScript
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This ignores whitespace and comments.

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  1. function getPrevious(el) {
  2. 	function isIgnorable(node) {
  3. 		// is a comment or contains only whitespace
  4. 		return (node.nodeType == 8 || /^[\t\n\r ]+$/.test(node.data));
  5. 	}
  6.  
  7. 	var prev = el;
  8. 	while (prev = prev.previousSibling) {
  9. 		if (!isIgnorable(prev)) break;
  10. 	}
  11.  
  12. 	return prev;
  13. }

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