Javascript XML Functions: serialzer, parser, XPATH








My = {};
My.xml = {
node : {
ELEMENT_NODE : 1, // Element
ATTRIBUTE_NODE : 2, // Attr
TEXT_NODE : 3, // Text
CDATA_SECTION_NODE : 4, // CDATASection
PROCESSING_INSTRUCTION_NODE : 7, // ProcessingInstruction
COMMENT_NODE : 8, // Comment
DOCUMENT_NODE : 9, // Document
DOCUMENT_TYPE_NODE : 10, // DocumentType
DOCUMENT_FRAGMENT_NODE : 11
// DocumentFragment
},
parse : function(txt) {
var doc;
if (typeof ActiveXObject != 'undefined') {
// Internet Explorer
doc = new ActiveXObject("Microsoft.XMLDOM");
doc.async = "false";
doc.loadXML(txt);
} else if (typeof DOMParser != 'undefined') {
// Mozilla Firefox
doc = (new DOMParser()).parseFromString(txt, 'text/xml');
} else {
var url = 'data:text/xml;charset=utf-8,' + encodeURIComponent(txt);
var request = new XMLHttpRequest();
request.open('GET', url, false);
request.send(null);
doc = request.responseXML;
}
return doc;
},
serialize : function(xmlObj) {
if (typeof xmlObj == 'object') {
var doc = xmlObj._xml ? xmlObj._xml : xmlObj;
if (doc.xml) {
// Internet Explorer
return doc.xml;
} else if (typeof XMLSerializer !== 'undefined') {
return (new XMLSerializer()).serializeToString(doc);
}
}
throw new Error('Cannot convert/serialize XML node: ' + xmlObj + '.');
},
xnodes : function(xe, xpath) {
var nodes;
if (window.ActiveXObject) {
nodes = xe.selectNodes(xpath);
} else if (window.XPathEvaluator) {
var result = (new XPathEvaluator()).evaluate(xpath, xe, null,
XPathResult.ORDERED_NODE_ITERATOR_TYPE, null);
nodes = [];
if (typeof result != 'undefined' && result != null) {
var node = result.iterateNext();
while (node) {
nodes.push(node);
node = result.iterateNext();
}
}
} else {
throw new Error('Failed to perform xpath. Your browser does not support XPATH.');
}
return nodes;
},
xnode : function(xe, xpath) {
var node;
if (window.ActiveXObject) {
node = xe.selectSingleNode(xpath);
} else if (window.XPathEvaluator) {
// FIRST_ORDERED_NODE_TYPE returns the first match to the xpath.
var result = (new XPathEvaluator()).evaluate(xpath, xe, null,
XPathResult.FIRST_ORDERED_NODE_TYPE, null);
if (typeof result != 'undefined' && result != null) {
node = result.singleNodeValue;
}
} else {
throw new Error('Failed to perform xpath. Your browser does not support XPATH.');
}
return node;
},
xvalues : function(xe, xpath) {
var values = [];
var nodes = this.xnodes(xe, xpath);
if (typeof nodes !== 'undefined' && nodes != null) {
for (var i = 0; i < nodes.length; i++) {
var node = nodes[i];
switch (node.nodeType) {
case this.node.ATTRIBUTE_NODE :
values.push(node.nodeValue);
break;
case this.node.ELEMENT_NODE :
node.normalize();
var text;
for (var j = 0; j < node.childNodes.length; j++) {
var childNode = node.childNodes[j];
if (childNode.nodeType === this.node.TEXT_NODE) {
text = childNode.nodeValue;
break;
}
}
if (typeof text !== 'undefined' && text != null) {
values.push(text);
}
break;
}
}
}
return values;
},
xvalue : function(xe, xpath) {
var value
var node = this.xnode(xe, xpath);
if (node) {
if (node.nodeType === this.node.ATTRIBUTE_NODE) {
value = node.nodeValue;
} else if (node.nodeType === this.node.ELEMENT_NODE) {
node.normalize();
for (var j = 0; j < node.childNodes.length; j++) {
var childNode = node.childNodes[j];
if (childNode.nodeType === this.node.TEXT_NODE) {
value = childNode.nodeValue;
break;
}
}
}
}
return value;
}
};



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