Created
March 4, 2013 20:55
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A cross browser way to get elements by class name by Robert Nyman
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/* | |
Developed by Robert Nyman, http://www.robertnyman.com | |
Code/licensing: http://code.google.com/p/getelementsbyclassname/ | |
*/ | |
var getElementsByClassName = function (className, tag, elm){ | |
if (document.getElementsByClassName) { | |
getElementsByClassName = function (className, tag, elm) { | |
elm = elm || document; | |
var elements = elm.getElementsByClassName(className), | |
nodeName = (tag)? new RegExp("\\b" + tag + "\\b", "i") : null, | |
returnElements = [], | |
current; | |
for(var i=0, il=elements.length; i<il; i+=1){ | |
current = elements[i]; | |
if(!nodeName || nodeName.test(current.nodeName)) { | |
returnElements.push(current); | |
} | |
} | |
return returnElements; | |
}; | |
} | |
else if (document.evaluate) { | |
getElementsByClassName = function (className, tag, elm) { | |
tag = tag || "*"; | |
elm = elm || document; | |
var classes = className.split(" "), | |
classesToCheck = "", | |
xhtmlNamespace = "http://www.w3.org/1999/xhtml", | |
namespaceResolver = (document.documentElement.namespaceURI === xhtmlNamespace)? xhtmlNamespace : null, | |
returnElements = [], | |
elements, | |
node; | |
for(var j=0, jl=classes.length; j<jl; j+=1){ | |
classesToCheck += "[contains(concat(' ', @class, ' '), ' " + classes[j] + " ')]"; | |
} | |
try { | |
elements = document.evaluate(".//" + tag + classesToCheck, elm, namespaceResolver, 0, null); | |
} | |
catch (e) { | |
elements = document.evaluate(".//" + tag + classesToCheck, elm, null, 0, null); | |
} | |
while ((node = elements.iterateNext())) { | |
returnElements.push(node); | |
} | |
return returnElements; | |
}; | |
} | |
else { | |
getElementsByClassName = function (className, tag, elm) { | |
tag = tag || "*"; | |
elm = elm || document; | |
var classes = className.split(" "), | |
classesToCheck = [], | |
elements = (tag === "*" && elm.all)? elm.all : elm.getElementsByTagName(tag), | |
current, | |
returnElements = [], | |
match; | |
for(var k=0, kl=classes.length; k<kl; k+=1){ | |
classesToCheck.push(new RegExp("(^|\\s)" + classes[k] + "(\\s|$)")); | |
} | |
for(var l=0, ll=elements.length; l<ll; l+=1){ | |
current = elements[l]; | |
match = false; | |
for(var m=0, ml=classesToCheck.length; m<ml; m+=1){ | |
match = classesToCheck[m].test(current.className); | |
if (!match) { | |
break; | |
} | |
} | |
if (match) { | |
returnElements.push(current); | |
} | |
} | |
return returnElements; | |
}; | |
} | |
return getElementsByClassName(className, tag, elm); | |
}; |
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