// von http://www.ilinsky.com/articles/XMLHttpRequest/
// XMLHttpRequest.js Copyright (C) 2008 Sergey Ilinsky (http://www.ilinsky.com)
//
// This work 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 work 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 library; if not, write to the Free Software Foundation, Inc.,
// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

(function () {

	// Save reference to earlier defined object implementation (if any)
	var oXMLHttpRequest	= window.XMLHttpRequest;
	// Define on browser type
	var bGecko	= !!window.controllers,
		bIE		= window.document.all && !window.opera;

	// Constructor
	function cXMLHttpRequest() {
		this._object	= oXMLHttpRequest ? new oXMLHttpRequest : new window.ActiveXObject("Microsoft.XMLHTTP");
		this._listeners	= [];
	};

	// BUGFIX: Firefox with Firebug installed would break pages if not executed
	if (bGecko && oXMLHttpRequest.wrapped)
		cXMLHttpRequest.wrapped	= oXMLHttpRequest.wrapped;

	// Constants
	cXMLHttpRequest.UNSENT				= 0;
	cXMLHttpRequest.OPENED				= 1;
	cXMLHttpRequest.HEADERS_RECEIVED	= 2;
	cXMLHttpRequest.LOADING				= 3;
	cXMLHttpRequest.DONE				= 4;

	// Public Properties
	cXMLHttpRequest.prototype.readyState	= cXMLHttpRequest.UNSENT;
	cXMLHttpRequest.prototype.responseText	= '';
	cXMLHttpRequest.prototype.responseXML	= null;
	cXMLHttpRequest.prototype.status		= 0;
	cXMLHttpRequest.prototype.statusText	= '';

	// Instance-level Events Handlers
	cXMLHttpRequest.prototype.onreadystatechange	= null;

	// Class-level Events Handlers
	cXMLHttpRequest.onreadystatechange	= null;
	cXMLHttpRequest.onopen				= null;
	cXMLHttpRequest.onsend				= null;
	cXMLHttpRequest.onabort				= null;

	// Public Methods
	cXMLHttpRequest.prototype.open	= function(sMethod, sUrl, bAsync, sUser, sPassword) {

		// When bAsync parameter value is ommited, use true as default
		if (arguments.length < 3)
			bAsync	= true;

		// Save async parameter for fixing Gecko bug with missing readystatechange in synchronous requests
		this._async		= bAsync;

		// Set the onreadystatechange handler
		var oRequest	= this,
			nState		= this.readyState;

		// BUGFIX: IE - memory leak on page unload (inter-page leak)
		if (bIE) {
			var fOnUnload	= function() {
				if (oRequest._object.readyState != cXMLHttpRequest.DONE) {
					fCleanTransport(oRequest);
					// Safe to abort here since onreadystatechange handler removed
					oRequest.abort();
				}
			};
			if (bAsync)
				window.attachEvent("onunload", fOnUnload);
		}

		this._object.onreadystatechange	= function() {
			if (bGecko && !bAsync)
				return;

			// Synchronize state
			oRequest.readyState		= oRequest._object.readyState;

			//
			fSynchronizeValues(oRequest);

			// BUGFIX: Firefox fires unneccesary DONE when aborting
			if (oRequest._aborted) {
				// Reset readyState to UNSENT
				oRequest.readyState	= cXMLHttpRequest.UNSENT;

				// Return now
				return;
			}

			if (oRequest.readyState == cXMLHttpRequest.DONE) {
				//
				fCleanTransport(oRequest);
// Uncomment this block if you need a fix for IE cache

				// BUGFIX: IE - cache issue
				if (!oRequest._object.getResponseHeader("Date")) {
					// Save object to cache
					oRequest._cached	= oRequest._object;

					// Instantiate a new transport object
					cXMLHttpRequest.call(oRequest);

					// Re-send request
					oRequest._object.open(sMethod, sUrl, bAsync, sUser, sPassword);
					oRequest._object.setRequestHeader("If-Modified-Since", oRequest._cached.getResponseHeader("Last-Modified") || new window.Date(0));
					// Copy headers set
					if (oRequest._headers)
						for (var sHeader in oRequest._headers)
							if (typeof oRequest._headers[sHeader] == "string")	// Some frameworks prototype objects with functions
								oRequest._object.setRequestHeader(sHeader, oRequest._headers[sHeader]);

					oRequest._object.onreadystatechange	= function() {
						// Synchronize state
						oRequest.readyState		= oRequest._object.readyState;

						if (oRequest._aborted) {
							//
							oRequest.readyState	= cXMLHttpRequest.UNSENT;

							// Return
							return;
						}

						if (oRequest.readyState == cXMLHttpRequest.DONE) {
							// Clean Object
							fCleanTransport(oRequest);

							// get cached request
							if (oRequest.status == 304)
								oRequest._object	= oRequest._cached;

							//
							delete oRequest._cached;

							//
							fSynchronizeValues(oRequest);

							//
							fReadyStateChange(oRequest);

							// BUGFIX: IE - memory leak in interrupted
							if (bIE && bAsync)
								window.detachEvent("onunload", fOnUnload);
						}
					};
					oRequest._object.send(null);

					// Return now - wait untill re-sent request is finished
					return;
				};

				// BUGFIX: IE - memory leak in interrupted
				if (bIE && bAsync)
					window.detachEvent("onunload", fOnUnload);
			}

			// BUGFIX: Some browsers (Internet Explorer, Gecko) fire OPEN readystate twice
			if (nState != oRequest.readyState)
				fReadyStateChange(oRequest);

			nState	= oRequest.readyState;
		};

		// Add method sniffer
		if (cXMLHttpRequest.onopen)
			cXMLHttpRequest.onopen.apply(this, arguments);

		if (arguments.length > 4)
			this._object.open(sMethod, sUrl, bAsync, sUser, sPassword);
		else
		if (arguments.length > 3)
			this._object.open(sMethod, sUrl, bAsync, sUser);
		else
			this._object.open(sMethod, sUrl, bAsync);

		// BUGFIX: Gecko - missing readystatechange calls in synchronous requests
		if (!bAsync && bGecko) {
			this.readyState	= cXMLHttpRequest.OPENED;

			fReadyStateChange(this);
		}
	};
	cXMLHttpRequest.prototype.send	= function(vData) {
		// Add method sniffer
		if (cXMLHttpRequest.onsend)
			cXMLHttpRequest.onsend.apply(this, arguments);

		// BUGFIX: Safari - fails sending documents created/modified dynamically, so an explicit serialization required
		// BUGFIX: IE - rewrites any custom mime-type to "text/xml" in case an XMLNode is sent
		// BUGFIX: Gecko - fails sending Element (this is up to the implementation either to standard)
		if (vData && vData.nodeType) {
			vData	= window.XMLSerializer ? new window.XMLSerializer().serializeToString(vData) : vData.xml;
			if (!this._headers["Content-Type"])
				this._object.setRequestHeader("Content-Type", "application/xml");
		}

		this._object.send(vData);

		// BUGFIX: Gecko - missing readystatechange calls in synchronous requests
		if (bGecko && !this._async) {
			this.readyState	= cXMLHttpRequest.OPENED;

			// Synchronize state
			fSynchronizeValues(this);

			// Simulate missing states
			while (this.readyState < cXMLHttpRequest.DONE) {
				this.readyState++;
				fReadyStateChange(this);
				// Check if we are aborted
				if (this._aborted)
					return;
			}
		}
	};
	cXMLHttpRequest.prototype.abort	= function() {
		// Add method sniffer
		if (cXMLHttpRequest.onabort)
			cXMLHttpRequest.onabort.apply(this, arguments);

		// BUGFIX: Gecko - unneccesary DONE when aborting
		if (this.readyState > cXMLHttpRequest.UNSENT)
			this._aborted	= true;

		this._object.abort();

		// BUGFIX: IE - memory leak
		fCleanTransport(this);
	};
	cXMLHttpRequest.prototype.getAllResponseHeaders	= function() {
		return this._object.getAllResponseHeaders();
	};
	cXMLHttpRequest.prototype.getResponseHeader	= function(sName) {
		return this._object.getResponseHeader(sName);
	};
	cXMLHttpRequest.prototype.setRequestHeader	= function(sName, sValue) {
		// BUGFIX: IE - cache issue
		if (!this._headers)
			this._headers	= {};
		this._headers[sName]	= sValue;

		return this._object.setRequestHeader(sName, sValue);
	};

	// EventTarget interface implementation
	cXMLHttpRequest.prototype.addEventListener	= function(sName, fHandler, bUseCapture) {
		for (var nIndex = 0, oListener; oListener = this._listeners[nIndex]; nIndex++)
			if (oListener[0] == sName && oListener[1] == fHandler && oListener[2] == bUseCapture)
				return;
		// Add listener
		this._listeners.push([sName, fHandler, bUseCapture]);
	};

	cXMLHttpRequest.prototype.removeEventListener	= function(sName, fHandler, bUseCapture) {
		for (var nIndex = 0, oListener; oListener = this._listeners[nIndex]; nIndex++)
			if (oListener[0] == sName && oListener[1] == fHandler && oListener[2] == bUseCapture)
				break;
		// Remove listener
		if (oListener)
			this._listeners.splice(nIndex, 1);
	};

	cXMLHttpRequest.prototype.dispatchEvent	= function(oEvent) {
		var oEvent	= {
			'type':			oEvent.type,
			'target':		this,
			'currentTarget':this,
			'eventPhase':	2,
			'bubbles':		oEvent.bubbles,
			'cancelable':	oEvent.cancelable,
			'timeStamp':	oEvent.timeStamp,
			'stopPropagation':	function() {},	// There is no flow
			'preventDefault':	function() {},	// There is no default action
			'initEvent':		function() {}	// Original event object should be inited
		};

		// Execute onreadystatechange
		if (oEvent.type == "readystatechange" && this.onreadystatechange)
			(this.onreadystatechange.handleEvent || this.onreadystatechange).apply(this, [oEvent]);

		// Execute listeners
		for (var nIndex = 0, oListener; oListener = this._listeners[nIndex]; nIndex++)
			if (oListener[0] == oEvent.type && !oListener[2])
				(oListener[1].handleEvent || oListener[1]).apply(this, [oEvent]);
	};

	//
	cXMLHttpRequest.prototype.toString	= function() {
		return '[' + "object" + ' ' + "XMLHttpRequest" + ']';
	};

	cXMLHttpRequest.toString	= function() {
		return '[' + "XMLHttpRequest" + ']';
	};

	// Helper function
	function fReadyStateChange(oRequest) {
		// Sniffing code
		if (cXMLHttpRequest.onreadystatechange)
			cXMLHttpRequest.onreadystatechange.apply(oRequest);

		// Fake event
		oRequest.dispatchEvent({
			'type':			"readystatechange",
			'bubbles':		false,
			'cancelable':	false,
			'timeStamp':	new Date + 0
		});
	};

	function fGetDocument(oRequest) {
		var oDocument	= oRequest.responseXML;
		// Try parsing responseText
		if (bIE && oDocument && !oDocument.documentElement && oRequest.getResponseHeader("Content-Type").match(/[^\/]+\/[^\+]+\+xml/)) {
			oDocument	= new window.ActiveXObject("Microsoft.XMLDOM");
			oDocument.loadXML(oRequest.responseText);
		}
		// Check if there is no error in document
		if (oDocument)
			if ((bIE && oDocument.parseError != 0) || (oDocument.documentElement && oDocument.documentElement.tagName == "parsererror"))
				return null;
		return oDocument;
	};

	function fSynchronizeValues(oRequest) {
		try {	oRequest.responseText	= oRequest._object.responseText;	} catch (e) {}
		try {	oRequest.responseXML	= fGetDocument(oRequest._object);	} catch (e) {}
		try {	oRequest.status			= oRequest._object.status;			} catch (e) {}
		try {	oRequest.statusText		= oRequest._object.statusText;		} catch (e) {}
	};

	function fCleanTransport(oRequest) {
		// BUGFIX: IE - memory leak (on-page leak)
		oRequest._object.onreadystatechange	= new window.Function;

		// Delete private properties
		delete oRequest._headers;
	};

	// Internet Explorer 5.0 (missing apply)
	if (!window.Function.prototype.apply) {
		window.Function.prototype.apply	= function(oRequest, oArguments) {
			if (!oArguments)
				oArguments	= [];
			oRequest.__func	= this;
			oRequest.__func(oArguments[0], oArguments[1], oArguments[2], oArguments[3], oArguments[4]);
			delete oRequest.__func;
		};
	};

	// Register new object with window
	window.XMLHttpRequest	= cXMLHttpRequest;
})();


// END GOOGLE CODE


// declare a global  XMLHTTP Request object
//var XmlHttpObj;

// create an instance of XMLHTTPRequest Object, varies with browser type, try for IE first then Mozilla
// http://en.design-noir.de/webdev/JS/XMLHttpRequest-IE/
// http://msdn.microsoft.com/en-us/library/ms535874%28VS.85%29.aspx
/*
function CreateXmlHttpObj(){ 

try { 
  // Firefox, Opera 8.0+, Safari 
  XmlHttpObj=new XMLHttpRequest(); 
} 
catch (e) { 
  // Internet Explorer 
  try { 
    XmlHttpObj=new ActiveXObject("Msxml2.XMLHTTP"); 
  } 
  catch (e) { 
    try { 
      XmlHttpObj=new ActiveXObject("Microsoft.XMLHTTP"); 
    } 
    catch (e) { 
      alert("Your browser does not support ajax!"); 
      return false; 
    } 
  } 
}
}
*/

/*
if (typeof(XMLHttpRequest)  === "undefined") {
  XMLHttpRequest = function() {
    try { return new ActiveXObject("Msxml2.XMLHTTP.6.0"); }
      catch(e) {}
    try { return new ActiveXObject("Msxml2.XMLHTTP.3.0"); }
      catch(e) {}
    try { return new ActiveXObject("Msxml2.XMLHTTP"); }
      catch(e) {}
    try { return new ActiveXObject("Microsoft.XMLHTTP"); }
      catch(e) {}
    throw new Error("This browser does not support XMLHttpRequest.");
  };
}
*/

// called from onChange or onClick event of the Bundesland dropdown list
function BundeslandListOnChange() 
{
	document.getElementById("bezirkselect").style.display='block';
    var BundeslandList = document.getElementById("BundeslandList");
   
 
    // get selected Bundesland from dropdown list
    var selectedBundesland = BundeslandList.options[BundeslandList.selectedIndex].value;
    
    // url of page that will send xml data back to client browser
    var requestUrl;
    // use the following line if using php
    requestUrl = "http://www.pilexa.com/code/area_bezirke.php" + "?filter=" + encodeURIComponent(selectedBundesland);
    
	//CreateXmlHttpObj();
	XmlHttpObj = new XMLHttpRequest();
	// verify XmlHttpObj variable was successfully initialized
	if(XmlHttpObj)
	{
        // assign the StateChangeHandler function ( defined below in this file)
        // to be called when the state of the XmlHttpObj changes
        // receiving data back from the server is one such change
		XmlHttpObj.onreadystatechange = StateChangeHandler;
		
		// define the iteraction with the server -- true for as asynchronous.
		XmlHttpObj.open("GET", requestUrl,  true);
		
		// send request to server, null arg  when using "GET"
		XmlHttpObj.send(null);		
	}
//	alert ("BundeslandListOnChange ausgeführt");
}

// this function called when state of  XmlHttpObj changes
// we're interested in the state that indicates data has been
// received from the server
function StateChangeHandler()
{
	// state ==4 indicates receiving response data from server is completed
	if(XmlHttpObj.readyState == 4)
	{
		// To make sure valid response is received from the server, 200 means response received is OK
		if(XmlHttpObj.status == 200)
		{			
			PopulateBezirkList(XmlHttpObj.responseXML.documentElement);
		}
		else
		{
			alert("problem retrieving data from the server, status code: "  + XmlHttpObj.status);
		}
	}
}

// populate the contents of the Bezirk dropdown list
function PopulateBezirkList(BezirkNode)
{
    var BezirkList = document.getElementById("BezirkList");
	// clear the Bezirk list 
	for (var count = BezirkList.options.length-1; count >-1; count--)
	{
		BezirkList.options[count] = null;
	}

	var BezirkNodes = BezirkNode.getElementsByTagName('Bezirk');
	var idValue;
	var textValue; 
	var optionItem;
	// populate the dropdown list with data from the xml doc
	for (var count = 0; count < BezirkNodes.length; count++)
	{
   		textValue = GetInnerText(BezirkNodes[count]);
		idValue = BezirkNodes[count].getAttribute("id");
		optionItem = new Option( textValue, idValue,  false, false);
		BezirkList.options[BezirkList.length] = optionItem;
	}
}

// returns the node text value 
function GetInnerText (node)
{
	 return (node.textContent || node.innerText || node.text) ;
}

//Gerold
function LandListOnChange() 
{
	//document.getElementById("bundeslandhinweis").style.display='none';
	document.getElementById("bundeslandselect").style.display='block';
    var LandList = document.getElementById("LandList");
    // alert("Hui");
    // get selected Bundesland from dropdown list
    var selectedLand = LandList.options[LandList.selectedIndex].value;
    
    // url of page that will send xml data back to client browser
    var requestUrl;
    // use the following line if using php
    requestUrl = "http://www.pilexa.com/code/area_bundesland.php" + "?filter=" + encodeURIComponent(selectedLand);
    
//	CreateXmlHttpObj();
XmlHttpObj = new XMLHttpRequest();	
	// verify XmlHttpObj variable was successfully initialized
	if(XmlHttpObj)
	{
        // assign the StateChangeHandler function ( defined below in this file)
        // to be called when the state of the XmlHttpObj changes
        // receiving data back from the server is one such change
		XmlHttpObj.onreadystatechange = StateChangeHandlerBundesland;
		
		// define the iteraction with the server -- true for as asynchronous.
		XmlHttpObj.open("GET", requestUrl,  true);
		
		// send request to server, null arg  when using "GET"
		XmlHttpObj.send(null);		
	}
//		alert ("LandListOnChange ausgeführt");
		//var x = BundeslandListOnChange();
}






//// Gerold
// this function called when state of  XmlHttpObj changes
// we're interested in the state that indicates data has been
// received from the server
function StateChangeHandlerBundesland()
{
	// state ==4 indicates receiving response data from server is completed
	if(XmlHttpObj.readyState == 4)
	{
		// To make sure valid response is received from the server, 200 means response received is OK
		if(XmlHttpObj.status == 200)
		{			
			PopulateBundeslandList(XmlHttpObj.responseXML.documentElement);
		}
		else
		{
			alert("problem retrieving data from the server, status code: "  + XmlHttpObj.status);
		}
	}
}

// populate the contents of the Bundesland dropdown list
function PopulateBundeslandList(BundeslandNode)
{
    var BundeslandList = document.getElementById("BundeslandList");
	// clear the Bundesland list 
	for (var count = BundeslandList.options.length-1; count >-1; count--)
	{
		BundeslandList.options[count] = null;
	}

	var BundeslandNodes = BundeslandNode.getElementsByTagName('Bundesland');
	var idValue;
	var textValue; 
	var optionItem;
	// populate the dropdown list with data from the xml doc
	for (var count = 0; count < BundeslandNodes.length; count++)
	{
   		textValue = GetInnerText(BundeslandNodes[count]);
		idValue = BundeslandNodes[count].getAttribute("id");
		optionItem = new Option( textValue, idValue,  false, false);
		BundeslandList.options[BundeslandList.length] = optionItem;
	}
}