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