Created
May 11, 2012 13:37
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Simple polyfill for fetching all elements on the page with the given class
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"getElementsByClassName"in document||(document.getElementsByClassName=document.evaluate?function(a){var a="[contains(concat(' ', @class, ' '), ' "+a+" ')]",d="http://www.w3.org/1999/xhtml"===document.documentElement.namespaceURI?"http://www.w3.org/1999/xhtml":null,b;try{b=document.evaluate(".//*"+a,document,d,0,null)}catch(c){b=document.evaluate(".//*"+a,document,null,0,null)}return b}:function(a){for(var a=RegExp("(^|\\s)"+a+"(\\s|$)"),d=document.all||document.getElementsByTagName("*"),b=[],c=0,e= | |
d.length;c<e;c+=1)a.test(d[c].className)&&b.push(d[c]);return b}); |
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/* | |
Based on "The ultimate getElementsByClassName, anno 2008" by Robert Nyman | |
http://robertnyman.com/2008/05/27/the-ultimate-getelementsbyclassname-anno-2008/ | |
Developed by Jon Gjengset <jon@thesquareplanet.com> | |
MIT license | |
This file will provide a stupidly simple fallback for getElementByClassName | |
Namely one that only supports lookup of a single class, and only on document | |
It also won't allow limiting results to only tags of a single type | |
Also, return types won't be normalized, so you might get an array or a NodeList depending | |
on the underlying implementation being used. | |
It is also about half the size of the Ultimate version at 1.8KB (571B minified) vs 2.4KB (1.05KB minified) | |
*/ | |
if (!("getElementsByClassName" in document)) { | |
if (document.evaluate) { | |
document.getElementsByClassName = function (className) { | |
var classCheck = "[contains(concat(' ', @class, ' '), ' " + className + " ')]", | |
xhtmlNamespace = "http://www.w3.org/1999/xhtml", | |
namespaceResolver = (document.documentElement.namespaceURI === xhtmlNamespace)? xhtmlNamespace : null, | |
elements; | |
try { | |
elements = document.evaluate(".//*" + classCheck, document, namespaceResolver, 0, null); | |
} | |
catch (e) { | |
elements = document.evaluate(".//*" + classCheck, document, null, 0, null); | |
} | |
return elements; | |
}; | |
} else { | |
document.getElementsByClassName = function (className) { | |
var classCheck = new RegExp("(^|\\s)" + className + "(\\s|$)"), | |
elements = document.all || document.getElementsByTagName('*'), | |
returnElements = []; | |
for (var l=0, ll=elements.length; l<ll; l+=1) { | |
if (classCheck.test(elements[l].className)) { | |
returnElements.push(elements[l]); | |
} | |
} | |
return returnElements; | |
} | |
} | |
} |
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