// Get element by id (cross-browser version).
//		id - id of element.
//		return - element.
function $(id) {
	var result;
	if (document.getElementById) {
		result = document.getElementById(id);
	} else if (document.all) {
		result = document.all[id];
	} else if (document.layers) {
		result = document.layers[id];
	}
	return result;
}	

// Submit form by id.
//		id - id of the form.
function submitForm(formId) {	
	var formElement;

	formElement = $(formId);	
	if (formElement) {
		formElement.submit() ;
	}
}

// Get XMLHttpRequest (cross-browser version).
//		result - XMLHttpRequest object.
function getXMLHttpRequest(){
	var xmlhttp;
	
	try {
		xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
	} catch (e) {
		try {
			xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
		} catch (e1) {
			xmlhttp = false;
		}
	}
	if (!xmlhttp && typeof XMLHttpRequest!='undefined') {
		xmlhttp = new XMLHttpRequest();
	}
	return xmlhttp;
}

// Ask SOAP-service for information and obtain response text in the IN-parameter of callback function.
// 		url - URL of the service (must contain name of the service).
// 		name - name of the service.
// 		xml - request XML.
// 		callback - callback function; must contain one input parameter to transfer response text.
function askSoapService(url, name, xml, callback) {
	var xmlHttpReq;

	xmlHttpReq = getXMLHttpRequest(); 
     
	xmlHttpReq.onreadystatechange = function() { 	 
		if (xmlHttpReq.readyState == 4) {	 
	    	if(xmlHttpReq.status == 200) {				
	        	callback(xmlHttpReq.responseText);
	        }
	    }	 
	}
	 
    xmlHttpReq.open('POST', url, true);
	
	// Headers
	xmlHttpReq.setRequestHeader('Content-Type','text/xml');
	xmlHttpReq.setRequestHeader('SOAPAction', name);
	
	xmlHttpReq.send(xml);
	
}

// Convert string with XML to XML-object (cross-browser version).
//		string - string with XML.
//		result - XML-object/
function convertStringToXml(string) {
	var xmlDoc;
	var parser;
	
	if (window.DOMParser) {
		parser = new DOMParser();
		xmlDoc = parser.parseFromString(string, "text/xml");
	} else {
		// For Internet Explorer
		xmlDoc = new ActiveXObject("Microsoft.XMLDOM");
		xmlDoc.async = "false";
		xmlDoc.loadXML(string);
	}
	return xmlDoc;
}

// Get XML elements by tag name with attention to prefix (cross-browser version).
//		xmlDocument - XML-object. 
//		prefix - prefix without trailing ":".
//		tagName - name of the tag.
//		result - array of the elements.
function getElementsByTagNameAndPrefix(xmlDocument, prefix, tagName) {
	var result;

	result = xmlDocument.getElementsByTagName(tagName);  
	if (result && result.length == 0) {
		result = xmlDocument.getElementsByTagName(prefix + ':' + tagName);	
	}	
	return result;
}

// Get text from child node.
//		parentNode - parent node (Object).
//		childNodeName - child node name (String).
//		result - string with the text.
function getChildNodeText(parentNode, childNodeName) {
	var child;
	
	child = parentNode.getElementsByTagName(childNodeName);	
	return child[0].childNodes[0].nodeValue;		
}

// Add new <option> to the <select> element.
//		listboc - <select> element.
//		text - text for the <option>.
//		value - value for the <option>.
//		isDefaultSelected - is <option> selected by default
//		isSelected - is <option> selected
//		result - just created <option>.
function addOption (listbox, text, value, isDefaultSelected, isSelected) {
	var option 
	
	option = document.createElement("option");
  	option.appendChild(document.createTextNode(text));
  	option.setAttribute("value", value);
  	if (isDefaultSelected) {
		option.defaultSelected = true;
	} else if (isSelected) {
		option.selected = true;
	}
	listbox.appendChild(option);
	return option;
}


// Load cities list with geo information.
//		idRegion - id of the region.
//		listBox - HTML-element "select", where to put found cities.
//		callback - callback function, that retrieves count of found cities
function getCitiesListByRegionIdWithGeoInfo(idRegion, listBox, callback) {
	var internalCallback;
	var xml;
			  
	internalCallback = function (responseText) {
		var cities;
		var city;
		var cityName;
		var id;		
		var hasGeoInformation;			
		var option;		
		var xmlDocument;		

		xmlDocument = convertStringToXml(responseText);
		if (!xmlDocument) {
			return;
		}

		cities = getElementsByTagNameAndPrefix(xmlDocument, 'ns2', 'CitiesList');  				
		if (cities) {
			
			callback(cities.length);			
			
			for (var i = 0; i < cities.length; ++i) {  
				city = cities[i];
				if (city.hasChildNodes()) {
					cityName = getChildNodeText(city, 'name');
					id = getChildNodeText(city, 'id');
					hasGeoInformation = getChildNodeText(city, 'hasGeoInformation');					
					option = addOption(listBox, cityName, id, false, false);
					option.setAttribute("hasgeoinformation", hasGeoInformation);
				} // if (city.hasChildNodes())
			} // for
			
		} // if (cities)

	}
	
	xml = '<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">' + 
			  ' <SOAP-ENV:Header/>' + 
			  ' <SOAP-ENV:Body>' + 
			  '  <getCitiesListByRegionIdWithGeoInfo xmlns="urn:singles:operations">' + 
			  '   <regionId>' + idRegion + '</regionId>' + 
			  '  </getCitiesListByRegionIdWithGeoInfo>' + 
			  ' </SOAP-ENV:Body>' + 
			  '</SOAP-ENV:Envelope>';	
	
			  		
	askSoapService('/ws/GeoService', 'GeoService', xml, internalCallback);	
	
}

// Load cities list.
//		idRegion - id of the region.
//		listBox - HTML-element "select", where to put found cities.
//		callback - callback function, that retrieves count of found cities
function getCitiesListByCountryId(idCountry, listBox, callback) {
	var internalCallback;
	var xml;	
				  
	internalCallback = function (responseText) {	
		var cities;
		var city;
		var cityName;
		var id;		
		var hasGeoInformation;			
		var option;		
		var xmlDocument;	

		xmlDocument = convertStringToXml(responseText);		
		if (!xmlDocument) {
			return;
		}
		
		cities = getElementsByTagNameAndPrefix(xmlDocument, 'ns2', 'CitiesList');  		
		if (cities) {
			
			callback(cities.length);			
			
			for (var i = 0; i < cities.length; ++i) {  
				city = cities[i];
				if (city.hasChildNodes()) {
					cityName = getChildNodeText(city, 'name');
					id = getChildNodeText(city, 'id');
					hasGeoInformation = getChildNodeText(city, 'hasGeoInformation');					
					option = addOption(listBox, cityName, id, false, false);
					option.setAttribute("hasgeoinformation", hasGeoInformation);
				} // if (city.hasChildNodes())
			} // for
			
		} // if (cities)

	}
	
	xml = '<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">' +
			  ' <SOAP-ENV:Header/>' +
			  ' <SOAP-ENV:Body>' +
			  '  <getCitiesListByCountryId xmlns="urn:singles:operations">' +
			  '   <countryId>' + idCountry + '</countryId>' +
			  '  </getCitiesListByCountryId>' +
			  ' </SOAP-ENV:Body>' +
			  '</SOAP-ENV:Envelope>';	
			  		
	askSoapService('/ws/GeoService', 'GeoService', xml, internalCallback);		
	
}

// Load regions list.
//		idCountry - id of the country.
//		listBox - HTML-element "select", where to put found regions.
//		callback - callback function, that retrieves count of found regions
function getRegionsListByCountryId(idCountry, listBox, callback) {
	var internalCallback;
	var xml;	
				  
	internalCallback = function (responseText) {	
		var regions;
		var region;
		var regionName;
		var id;			
		var option;		
		var xmlDocument;	

		xmlDocument = convertStringToXml(responseText);		
		if (!xmlDocument) {
			return;
		}
		
		regions = getElementsByTagNameAndPrefix(xmlDocument, 'ns2', 'RegionsList');   		
		if (regions) {
			
			callback(regions.length);			
			
			for (var i = 0; i < regions.length; ++i) {  
				region = regions[i];
				if (region.hasChildNodes()) {
					regionName = getChildNodeText(region, 'name');
					id = getChildNodeText(region, 'id');
					option = addOption(listBox, regionName, id, false, false);
				} // if (region.hasChildNodes())
			} // for
			
		} // if (regions)

	}
	
	xml = '<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">' +
    	  ' <SOAP-ENV:Header/>' +
    	  ' <SOAP-ENV:Body>' +
    	  '  <getRegionsListByCountryId xmlns="urn:singles:operations">' +
    	  '   <countryId>' + idCountry + '</countryId>' +
    	  '  </getRegionsListByCountryId>' +
    	  ' </SOAP-ENV:Body>' +
    	  '</SOAP-ENV:Envelope>';	
			  		
	askSoapService('/ws/GeoService', 'GeoService', xml, internalCallback);		
	
}