xml.js

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var TDXml = function()
{}

TDXml.prototype.GetHttpRequest = function()
{
	// Gecko / IE7
	if ( typeof(XMLHttpRequest) != 'undefined' )
		return new XMLHttpRequest() ;

	// IE6
	try { return new ActiveXObject( 'Msxml2.XMLHTTP' ) ; }
	catch(e) {}

	// IE5
	try { return new ActiveXObject( 'Microsoft.XMLHTTP' ) ; }
	catch(e) {}

	return null ;
}

TDXml.prototype.LoadUrl = function( urlToCall, asyncFunctionPointer )
{
	var oTDXml = this ;

	var bAsync = ( typeof(asyncFunctionPointer) == 'function' ) ;

	var oXmlHttp = this.GetHttpRequest() ;

	oXmlHttp.open( "GET", urlToCall, bAsync ) ;

	if ( bAsync )
	{
		oXmlHttp.onreadystatechange = function()
		{
			if ( oXmlHttp.readyState == 4 )
			{
				if ( ( oXmlHttp.status != 200 && oXmlHttp.status != 304 ) || oXmlHttp.responseXML == null || oXmlHttp.responseXML.firstChild == null )
				{
					alert( 'The server didn\'t send back a proper XML response. Please contact your system administrator.\n\n' +
							'XML request error: ' + oXmlHttp.statusText + ' (' + oXmlHttp.status + ')\n\n' +
							'Requested URL:\n' + urlToCall + '\n\n' +
							'Response text:\n' + oXmlHttp.responseText ) ;
					return ;
				}

				oTDXml.DOMDocument = oXmlHttp.responseXML ;
				asyncFunctionPointer( oTDXml ) ;
			}
		}
	}

	oXmlHttp.send( null ) ;

	if ( ! bAsync )
	{
		if ( oXmlHttp.status == 200 || oXmlHttp.status == 304 )
			this.DOMDocument = oXmlHttp.responseXML ;
		else
		{
			alert( 'XML request error: ' + oXmlHttp.statusText + ' (' + oXmlHttp.status + ')' ) ;
		}
	}
}

TDXml.prototype.SelectNodes = function( xpath )
{
	if ( navigator.userAgent.indexOf('MSIE') >= 0 )		// IE
		return this.DOMDocument.selectNodes( xpath ) ;
	else					// Gecko
	{
		var aNodeArray = new Array();

		var xPathResult = this.DOMDocument.evaluate( xpath, this.DOMDocument,
				this.DOMDocument.createNSResolver(this.DOMDocument.documentElement), XPathResult.ORDERED_NODE_ITERATOR_TYPE, null) ;
		if ( xPathResult )
		{
			var oNode = xPathResult.iterateNext() ;
 			while( oNode )
 			{
 				aNodeArray[aNodeArray.length] = oNode ;
 				oNode = xPathResult.iterateNext();
 			}
		}
		return aNodeArray ;
	}
}

TDXml.prototype.SelectSingleNode = function( xpath )
{
	if ( navigator.userAgent.indexOf('MSIE') >= 0 )		// IE
		return this.DOMDocument.selectSingleNode( xpath ) ;
	else					// Gecko
	{
		var xPathResult = this.DOMDocument.evaluate( xpath, this.DOMDocument,
				this.DOMDocument.createNSResolver(this.DOMDocument.documentElement), 9, null);

		if ( xPathResult && xPathResult.singleNodeValue )
			return xPathResult.singleNodeValue ;
		else
			return null ;
	}
}