Posted By

jasonseney on 04/23/10

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javascript
DOM

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Last Edited at 04/23/10 09:29am

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Javascript DOM - getElementsByClassName

/ Published in: JavaScript

Similar to [Get Elements by Class Name]( http://snipplr.com/view/1696/get-elements-by-class-name/), but with optional "tag" parameter. Performance is increased by first retrieving the desired tag if available.

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getElementsByClassName: function(classname, baseNode, tag) {
	baseNode = baseNode || document.getElementsByTagName("body")[0];
	var a = [];
	var re = new RegExp('\\b' + classname + '\\b');
	var els = baseNode.getElementsByTagName(tag || "*");
	for (var i = 0, j = els.length; i < j; i++)
		if (re.test(els[i].className)) a.push(els[i]);
	return a;
}