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05.05.2008 at 08:07AM PDT, ID: 23376600
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ajax.net callback from javascripte doesn't execute "onSuccsesfulCallback"  after a another callback is submited

Tags: asp.net,ajax
i use web servise and script manager to execute a callback from java script .

SearchService.Search(serverRequest, onSearchResponse); (where SearchService is the web service and "search is a web method ,serverRequest is the data for the function and onSearchResponse is a javascript method to excute after the server finish to procces the request)
all is fine when i only call this method one but when i use this metod twice on the same time , meaning , i call differnet searches without wating for the first to response the first call breaks and the respective onSearchResponse never gets invoked, any ideas for what can be the reasone for this not "asynchronic" beahvior ?
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[WebMethod(EnableSession=true)]
	public CookieBase Search(SearchRequest searchRequest)
	{
 
		search.Query.LanguageCode = "en";
 
		Tools.SearchQuery s = null;
 
		try
		{
		      s = Tools.Search.CreateSearch(search.Serialize(), QueryAdapter.GetCityDescription(searchRequest.CityCode), searchRequest.CheckIn, searchRequest.Nights, searchRequest.StarsRate);
		}
		catch (Exception ex)
		{
			return new ErrorResponse(ex.ToString(), searchRequest);
		}
 
        //Performing query
 
		s.Hotels = search.Hotels;
 
		string tabHeader = searchRequest.CityName + " - " + search.Hotels.Count,
			   bodyHeader = "<div class='title_search fixAlignCenter'>";
 
		string nightStr = (search.Hotels.Count > 1) ? "night" : "nights";
		string[] month = new string[13] { "", "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December" };
 
		switch (search.Hotels.Count)
		{
			case 0:
				bodyHeader += "No hotels found matching your search parameters";
				break;
 
			case 1:
				bodyHeader += String.Format("We found one hotelin {0} on {1} {2} {3} for {4} {5}", s.City, s.CheckIn.ToString("dd"), month[s.CheckIn.Month], s.CheckIn.ToString("yyyy"), s.Nights, nightStr);
				break;
 
			default:
				bodyHeader += String.Format("We found {0} hotels in {1} on {2} {3} {4} for {5} {6}", search.Hotels.Count, s.City, s.CheckIn.ToString("dd"), month[s.CheckIn.Month], s.CheckIn.ToString("yyyy"), s.Nights, nightStr);
				break;
		}
 
		bodyHeader += "</div>";
 
 
		SearchResponse result = new SearchResponse(s.ID, tabHeader, bodyHeader, searchRequest);
 
		
		System.Collections.Generic.List<HotelItem> items = new System.Collections.Generic.List<HotelItem>();
 
		foreach (Hotel hotel in s.Hotels)
		{
			if (hotel.Info.GeoCodes != null)
			{
				try
				{
					double latitude = double.Parse(hotel.Info.GeoCodes.Latitude, System.Globalization.CultureInfo.InvariantCulture);
					double longitude = double.Parse(hotel.Info.GeoCodes.Longitude, System.Globalization.CultureInfo.InvariantCulture);
 
 
					double TotalStayPriceEUR = 0,
						   TotalStayPriceUSD = 0,
						   TotalStayPriceGBP = 0;
 
					if (hotel.RoomClases != null && hotel.RoomClases.Count > 0)
					{
						foreach (Bepro.Common.RoomClass roomClass in hotel.RoomClases)
						{
							if (roomClass.HotelRooms == null || roomClass.HotelRooms.Count == 0)
								continue;
 
							Bepro.Common.HotelRoom room = roomClass.HotelRooms[0];
 
							if (TotalStayPriceUSD == 0 || TotalStayPriceEUR < roomClass.Price.Gross.EUR)
							{
								TotalStayPriceEUR = roomClass.Price.Gross.EUR;
								TotalStayPriceUSD = roomClass.Price.Gross.USD;
								TotalStayPriceGBP = roomClass.Price.Gross.GBP;
							}
						}
					}
 
					items.Add(new HotelItem(hotel.Item.Desc, 
											latitude, longitude, 
											(short)hotel.SortByStar,
											TotalStayPriceEUR, TotalStayPriceUSD, TotalStayPriceGBP, 
											String.Format("?hotel={0}&city={1}&supplier={2}", hotel.Item.Code, hotel.City.SysCode, hotel.SysSupp.SysCode)
											));
				}
				catch (Exception) { }
			}
		}
 
		//ClientScript.RegisterClientScriptBlock(this.GetType(), "hotels", String.Format("var hotels = {0};\n", Serializer.Serialize(items)), true);
		result.Items = items;
		
		return result;
	}
 
	private static GeoTableAdapters.QueriesTableAdapter m_queryAdapter = null;
	private GeoTableAdapters.QueriesTableAdapter QueryAdapter
	{
		get
		{
			if (m_queryAdapter == null)
				m_queryAdapter = new GeoTableAdapters.QueriesTableAdapter();
 
			return m_queryAdapter;
		}
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Question Stats
Zone: Programming
Question Asked By: alontamar
Solution Provided By: wilq32
Participating Experts: 1
Solution Grade: B
Views: 4
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05.06.2008 at 02:07PM PDT, ID: 21511077

Rank: Guru

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05.07.2008 at 04:39AM PDT, ID: 21515236

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05.07.2008 at 08:53AM PDT, ID: 21517698

Rank: Guru

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05.07.2008 at 09:14AM PDT, ID: 21517897

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05.07.2008 at 12:21PM PDT, ID: 21519530

Rank: Guru

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05.06.2008 at 02:07PM PDT, ID: 21511077

Rank: Guru

Probably the problem lying in connection Object. Remember, that if you send on the same connection object another request - the old one is overwrited by this new one. The solution is to make a new XMLHTTPRequest object if you plan to use more than one simmulate connection at once, or just make sure that every time you send/get value via AJAX you create object from begining :) Hope it helps
 
05.07.2008 at 04:39AM PDT, ID: 21515236
thanks, that makes a lot of sence but how do i do it using ajax.net build-in Functionality (update panel etc.)?
 
05.07.2008 at 08:53AM PDT, ID: 21517698

Rank: Guru

AJAX and Javascript is not any mistery for me but im weak with .NET :(( However if you are not sure how the object are created you could do a simple queue of items to send - if something is actually sendend just push it on Array element, then after process is completed just send another query. :)


var queue=new Array()
var procesing=false;

function send(text)
{
  if (procesing==false)

   {
           ajax.callback(somefunction); // here set somehow callback fuction
           ajax.send(text);
    }
  else
   queue.push(text);
}

function somefunction()
{

   // do some stuff after retrieving answer from server

   // now check queue:
   if (queue.length>0)

   {
        // if you plan to use FIFO queue you could put here:   queue.reverse();
        send(queue.pop());
       // and here we need queue.reverse();  again :)
   }


}
 
05.07.2008 at 09:14AM PDT, ID: 21517897
yes that's what i did.  but this metod totaly breaks the asynchronic advantages    
 
05.07.2008 at 12:21PM PDT, ID: 21519530

Rank: Guru

you still can get something when you are on page, javascript wont block working on page so ... you still have asynchronic advantages, but not multiply server asks (that are limited on the other hand). But of course as I said you could do it by making new XMLHttpRequest object   or similar object in .NET (do not use element that is initalized once, but just initalize it every time when you want to get or send any informations)
Accepted Solution
 
 
05.07.2008 at 10:28PM PDT, ID: 21522502
Thanks. i would like to know if there is any way to do such a thing in ajax.net ,
 
 
 
20080236-EE-VQP-29 / EE_QW_2_20070628