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== Basic XML DOM Usage with zXml Library==



<source lang="javascript">
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title>Basic XML DOM Usage</title>
<script type="text/javascript">
/*------------------------------------------------------------------------------
* JavaScript zXml Library
* Version 1.0.2
* by Nicholas C. Zakas, http://www.nczonline.net/
* Copyright (c) 2004-2006 Nicholas C. Zakas. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*------------------------------------------------------------------------------
*/

var zXml /*:Object*/ = {
useActiveX: (typeof ActiveXObject != "undefined"),
useDom: document.implementation && document.implementation.createDocument,
useXmlHttp: (typeof XMLHttpRequest != "undefined")
};
zXml.ARR_XMLHTTP_VERS /*:Array*/ = ["MSXML2.XmlHttp.6.0","MSXML2.XmlHttp.3.0"];
zXml.ARR_DOM_VERS /*:Array*/ = ["MSXML2.DOMDocument.6.0","MSXML2.DOMDocument.3.0"];

/**
* Static class for handling XMLHttp creation.
* @class
*/
function zXmlHttp() {
}
/**
* Creates an XMLHttp object.
* @return An XMLHttp object.
*/
zXmlHttp.createRequest = function ()/*:XMLHttp*/ {
//if it natively supports XMLHttpRequest object
if (zXml.useXmlHttp) {
return new XMLHttpRequest();
} else if (zXml.useActiveX) { //IE < 7.0 = use ActiveX

if (!zXml.XMLHTTP_VER) {
for (var i=0; i < zXml.ARR_XMLHTTP_VERS.length; i++) {
try {
new ActiveXObject(zXml.ARR_XMLHTTP_VERS[i]);
zXml.XMLHTTP_VER = zXml.ARR_XMLHTTP_VERS[i];
break;
} catch (oError) {
}
}
}

if (zXml.XMLHTTP_VER) {
return new ActiveXObject(zXml.XMLHTTP_VER);
} else {
throw new Error("Could not create XML HTTP Request.");
}
} else {
throw new Error("Your browser doesn"t support an XML HTTP Request.");
}
};
/**
* Indicates if XMLHttp is available.
* @return True if XMLHttp is available, false if not.
*/
zXmlHttp.isSupported = function ()/*:Boolean*/ {
return zXml.useXmlHttp || zXml.useActiveX;
};

/**
* Static class for handling XML DOM creation.
* @class
*/
function zXmlDom() {
}
/**
* Creates an XML DOM document.
* @return An XML DOM document.
*/
zXmlDom.createDocument = function () /*:XMLDocument*/{
if (zXml.useDom) {
var oXmlDom = document.implementation.createDocument("","",null);
oXmlDom.parseError = {
valueOf: function () { return this.errorCode; },
toString: function () { return this.errorCode.toString() }
};

oXmlDom.__initError__();

oXmlDom.addEventListener("load", function () {
this.__checkForErrors__();
this.__changeReadyState__(4);
}, false);
return oXmlDom;

} else if (zXml.useActiveX) {
if (!zXml.DOM_VER) {
for (var i=0; i < zXml.ARR_DOM_VERS.length; i++) {
try {
new ActiveXObject(zXml.ARR_DOM_VERS[i]);
zXml.DOM_VER = zXml.ARR_DOM_VERS[i];
break;
} catch (oError) {
}
}
}

if (zXml.DOM_VER) {
return new ActiveXObject(zXml.DOM_VER);
} else {
throw new Error("Could not create XML DOM document.");
}
} else {
throw new Error("Your browser doesn"t support an XML DOM document.");
}
};
/**
* Indicates if an XML DOM is available.
* @return True if XML DOM is available, false if not.
*/
zXmlDom.isSupported = function ()/*:Boolean*/ {
return zXml.useDom || zXml.useActiveX;
};
//Code to make Mozilla DOM documents act more like MS DOM documents.
var oMozDocument = null;
if (typeof XMLDocument != "undefined") {
oMozDocument = XMLDocument;
} else if (typeof Document != "undefined") {
oMozDocument = Document;
}
if (oMozDocument && !window.opera) {
oMozDocument.prototype.readyState = 0;
oMozDocument.prototype.onreadystatechange = null;
oMozDocument.prototype.__changeReadyState__ = function (iReadyState) {
this.readyState = iReadyState;
if (typeof this.onreadystatechange == "function") {
this.onreadystatechange();
}
};
oMozDocument.prototype.__initError__ = function () {
this.parseError.errorCode = 0;
this.parseError.filepos = -1;
this.parseError.line = -1;
this.parseError.linepos = -1;
this.parseError.reason = null;
this.parseError.srcText = null;
this.parseError.url = null;
};

oMozDocument.prototype.__checkForErrors__ = function () {
if (this.documentElement.tagName == "parsererror") {
var reError = />([\s\S]*?)Location:([\s\S]*?)Line Number (\d+), Column (\d+):<sourcetext>([\s\S]*?)(?:\-*\^)/;
reError.test(this.xml);

this.parseError.errorCode = -999999;
this.parseError.reason = RegExp.$1;
this.parseError.url = RegExp.$2;
this.parseError.line = parseInt(RegExp.$3);
this.parseError.linepos = parseInt(RegExp.$4);
this.parseError.srcText = RegExp.$5;
}
};

oMozDocument.prototype.loadXML = function (sXml) {

this.__initError__();

this.__changeReadyState__(1);

var oParser = new DOMParser();
var oXmlDom = oParser.parseFromString(sXml, "text/xml");

while (this.firstChild) {
this.removeChild(this.firstChild);
}
for (var i=0; i < oXmlDom.childNodes.length; i++) {
var oNewNode = this.importNode(oXmlDom.childNodes[i], true);
this.appendChild(oNewNode);
}

this.__checkForErrors__();

this.__changeReadyState__(4);
};

oMozDocument.prototype.__load__ = oMozDocument.prototype.load;
oMozDocument.prototype.load = function (sURL) {
this.__initError__();
this.__changeReadyState__(1);
this.__load__(sURL);
};

Node.prototype.__defineGetter__("xml", function () {
var oSerializer = new XMLSerializer();
return oSerializer.serializeToString(this, "text/xml");
});
Node.prototype.__defineGetter__("text", function () {
var sText = "";
for (var i = 0; i < this.childNodes.length; i++) {
if (this.childNodes[i].hasChildNodes()) {
sText += this.childNodes[i].text;
} else {
sText += this.childNodes[i].nodeValue;
}
}
return sText;
});
}
/**
* Static class for handling XSLT transformations.
* @class
*/
function zXslt() {
}
/**
* Transforms an XML DOM to text using an XSLT DOM.
* @param oXml The XML DOM to transform.
* @param oXslt The XSLT DOM to use for the transformation.
* @return The transformed version of the string.
*/
zXslt.transformToText = function (oXml /*:XMLDocument*/, oXslt /*:XMLDocument*/)/*:String*/ {
if (typeof XSLTProcessor != "undefined") {
var oProcessor = new XSLTProcessor();
oProcessor.importStylesheet(oXslt);

var oResultDom = oProcessor.transformToDocument(oXml);
var sResult = oResultDom.xml;

if (sResult.indexOf("<transformiix:result") > -1) {
sResult = sResult.substring(sResult.indexOf(">") + 1,
sResult.lastIndexOf("<"));
}

return sResult;
} else if (zXml.useActiveX) {
return oXml.transformNode(oXslt);
} else {
throw new Error("No XSLT engine found.");
}
};
/**
* Static class for handling XPath evaluation.
* @class
*/
function zXPath() {
}
/**
* Selects the first node matching a given XPath expression.
* @param oRefNode The node from which to evaluate the expression.
* @param sXPath The XPath expression.
* @param oXmlNs An object containing the namespaces used in the expression. Optional.
* @return An XML node matching the expression or null if no matches found.
*/
zXPath.selectNodes = function (oRefNode /*:Node*/, sXPath /*:String*/, oXmlNs /*:Object*/) {
if (typeof XPathEvaluator != "undefined") {

oXmlNs = oXmlNs || {};

var nsResolver = function (sPrefix) {
return oXmlNs[sPrefix];
};

var oEvaluator = new XPathEvaluator();
var oResult = oEvaluator.evaluate(sXPath, oRefNode, nsResolver,
XPathResult.ORDERED_NODE_ITERATOR_TYPE,
null);
var aNodes = new Array;

if (oResult != null) {
var oElement = oResult.iterateNext();
while(oElement) {
aNodes.push(oElement);
oElement = oResult.iterateNext();
}
}

return aNodes;

} else if (zXml.useActiveX) {
if (oXmlNs) {
var sXmlNs = "";
for (var sProp in oXmlNs) {
sXmlNs += "xmlns:" + sProp + "=\"" + oXmlNs[sProp] + "\" ";
}
oRefNode.ownerDocument.setProperty("SelectionNamespaces", sXmlNs);
}
return oRefNode.selectNodes(sXPath);
} else {
throw new Error("No XPath engine found.");
}
};
/**
* Selects the first node matching a given XPath expression.
* @param oRefNode The node from which to evaluate the expression.
* @param sXPath The XPath expression.
* @param oXmlNs An object containing the namespaces used in the expression.
* @return An XML node matching the expression or null if no matches found.
*/
zXPath.selectSingleNode = function (oRefNode /*:Node*/, sXPath /*:String*/, oXmlNs /*:Object*/) {
if (typeof XPathEvaluator != "undefined") {

oXmlNs = oXmlNs || {};

var nsResolver = function (sPrefix) {
return oXmlNs[sPrefix];
};

var oEvaluator = new XPathEvaluator();
var oResult = oEvaluator.evaluate(sXPath, oRefNode, nsResolver,
XPathResult.FIRST_ORDERED_NODE_TYPE, null);

if (oResult != null) {
return oResult.singleNodeValue;
} else {
return null;
}

} else if (zXml.useActiveX) {
if (oXmlNs) {
var sXmlNs = "";
for (var sProp in oXmlNs) {
sXmlNs += "xmlns:" + sProp + "=\"" + oXmlNs[sProp] + "\" ";
}
oRefNode.ownerDocument.setProperty("SelectionNamespaces", sXmlNs);
}
return oRefNode.selectSingleNode(sXPath);
} else {
throw new Error("No XPath engine found.")
}
};
/**
* General purpose XML serializer.
* @class
*/
function zXMLSerializer() {
}
/**
* Serializes the given XML node into an XML string.
* @param oNode The XML node to serialize.
* @return An XML string.
*/
zXMLSerializer.prototype.serializeToString = function (oNode /*:Node*/)/*:String*/ {
var sXml = "";

switch (oNode.nodeType) {
case 1: //element
sXml = "<" + oNode.tagName;

for (var i=0; i < oNode.attributes.length; i++) {
sXml += " " + oNode.attributes[i].name + "=\"" + oNode.attributes[i].value + "\"";
}

sXml += ">";

for (var i=0; i < oNode.childNodes.length; i++){
sXml += this.serializeToString(oNode.childNodes[i]);
}

sXml += "</" + oNode.tagName + ">";
break;

case 3: //text node
sXml = oNode.nodeValue;
break;
case 4: //cdata
sXml = "<![CDATA[" + oNode.nodeValue + "";
break;
case 7: //processing instruction
sXml = "<?" + oNode.nodevalue + "?>";
break;
case 8: //comment
sXml = "";
break;
case 9: //document
for (var i=0; i < oNode.childNodes.length; i++){
sXml += this.serializeToString(oNode.childNodes[i]);
}
break;

}

return sXml;
};
</script>
</head>
<body>
<script>
//create a DOM document
var oXml = zXmlDom.createDocument();

//fill it with some XML
oXml.loadXML("<root><child index=\"1\"/><child index=\"2\"/><child index=\"1\"/><child index=\"3\"/></root>");

//look around
alert("Root is: " + oXml.documentElement.tagName);
alert("First child is: " + oXml.documentElement.firstChild.tagName);

</script>
</body>
</html></source>

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