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Refactored and added TODOs for future cleanup and improvement
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,78 @@ | ||
/* | ||
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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