Javascript Calls To An Ajax WebMethod. How To Get Multiple Output Params Returned
Apr 24, 2010
I know how to call a simple old fashion asmx webservice webthod that returns a single value as a function return result. But what if I want to return multiple output params? My current approach is to separate the params by a dividing character and parse them on teh client. Is there a better way.
Here's how I return a single function result. How do I return multiple output values?
I have a 2007 excel addin app (VS2005) which calls a web service (also developed in VS2005). When the webservice returns a large amount of data I get the following exception
System.InvalidOperationException: There is an error in XML document (1, 14493956). ---> System.Xml.XmlException: ' ', hexadecimal value 0x1C, is an invalid character. Line 1, position 14493956. at System.Xml.XmlTextReaderImpl.Throw(Exception e)
I have an ASP.NET page with two instances of the same Web User Control (a simple WYSIWYG editor). On submit, the WUCs do a little JavaScript magic and then proceed with a normal postback.
The first instance seems to be working, but the second fails to post changes back to the server (it reverts to the original, and posts that). I believe the problem is that the JS only fires for the first WUC. I've traced that to the following code, from the generated client-side source:
function WebForm_OnSubmit() { prepHtml('AddEditPopup1_ctlEditorQuestion_txtEdit','AddEditPopup1_ctlEditorQuestion_divEdit', 'AddEditPopup1_ctlEditorQuestion_divHT' ); //snip... }
The problem seems to be that there should be two calls to prepHtml: one for the ctlEditorQuestion instance of the WUC, and one for the ctlEditorAnswer instance.
Instead, there's only the one for ctlEditorQuestion. Both controls are registering the OnSubmit event, but one of them overwrites the other.The prepHtml call is registered from the WUCs' C# code at runtime:
I should point out that I didn't write this control myself, and I've never seen this kind of runtime registration of OnSubmit JS code before. Page.ClientScript.RegisterOnSubmitStatement is totally new to me. I need to register both prepHtml calls so they run sequentially. Is this possible? I'm open to alternatives to Page.ClientScript.RegisterOnSubmitStatement, so long as the code still gets fired on submit.
I have a webservice (ASP.NET) deployed on a webfarm. A client application consumes it on daily basis. The problem is that some of its calls are duplicated (with difference of milliseconds). For example I have a function Foo(string a,string b). The client app calls this webmethod as Foo('test1','test2') once but my log shows that it is being called twice or sometimes 3 or 4 times randomly. Is this anything wrong with the webfarm or the code? Note that the webmethod has simple straighfarward insert and update statements.
I can't seem to call a web service method from Ajax with both POST and GET.
Initially only the POST would work and GET would causes this error:
{"Message":"An attempt was made to call the method u0027getDatau0027 using a GET request, which is not allowed.","StackTrace":" at System.Web.Script.Services.RestHandler.GetRawParams(WebServiceMethodData methodData, HttpContext context)at System.Web.Script.Services.RestHandler.ExecuteWebServiceCall(HttpContext context, WebServiceMethodData methodData)","ExceptionType":"System.InvalidOperationException"}
I fixed that by adding this attribute: [ScriptMethod(UseHttpGet=true)] but now GET causes this error:
[code]....
So is it true that you can only use either POST or GET and not both from Ajax?
I am trying to make 2 separate AJAX calls using buttons. What I want to happen is: when Button1 is clicked ProductsTable shows data from the webservice; when Button2 is clicked OthersTable shows its own data from the webservice. But right now, when either button is clicked, nothing shows up. I know the code works if there's only one of them and it's not wrapped around a .click function.
No error messages. ASP.NET 4.0, JQuery 1.4.4. Not using ScriptManager. Not using UpdatePanels.
Code: [ScriptService] public partial class Default2 : System.Web.UI.Page { [WebMethod] [ScriptMethod(UseHttpGet = true, ResponseFormat = ResponseFormat.Json)] public static string GetStudent()
[code]....
And this is my HTML.What I'm trying to do is populate the JQuery DataTable using the returned JSON Formated data of the WebMethod. But its not working,
For a web application developed on ASP.NET, we are finding that for user control files (ascx) we are returning long strings as a result of method calls. These are embedded in the ascx pages using the special tags <% %>When performing memory dump analysis for the application, we find that many of those strings are not being garbage collected. Also, the ascx pages are compiled to temporary DLLs and they are held in memory. Is this responsible for causing the long strings to remain in memory and not be garbage collected ?
I am currently building an asp.net webforms application in ASP.NET C# using Visual studio 2008 and the Framework .NET 3.5.In my application main page, I use some javascript code to make AJAX calls to different handlers (.ashx files) in order to get some information.In this handlers définition (in the CodeBehind), I use the Oracle provider for .NET (Oracle.DataAccess.Client) to get the requested information from an Oracle database.The thing is, when I make a first call to one of these handlers, everything works just fine, but when the main page try to repeat the call in order to update the information requested, I encounter a problem.In fact, it appears that the different Oracle SQL request results that were made during the first call are still in memory and that the requests are not repeated correctly in order to obtain the updated information from the database. The application keeps the first results and this is these results that are sent back to the main page once again.I don't know how to force the handler to obtain new results and work with it instead of working with the previous results.In the handlers définition, the IsReusable methods are all set to false.I have called the Dispose() méthods of every Oracle object at the hand of the handlers définition and then the System.GC.Collect() méthod to force Garbage Collection. But this does not seem to be sufficient to be sure that nothing is kept in memory.
I have a simple web method written in the code-behind (not a separate asmx) of a test aspx page.
All it does is return a DataTable(or DataSet) both are failing, gives a blank 500 error saying "There was an error processing the request"
If I switch the return variable type to String, it works fine
I think my issue has to do with the version of the System.Web.Extensions, is that the assembly that actually contains the JSON communication implementation?
I've read all kinds of tutorials about how it should be possible to return the DataTable to javascript and then read the properties with javascript syntax.
For some reason it isn't working for me.
My web extensions is imported through my web.config with the following version
I am trying to return a sum total figure from a stored procedure by using the output parameter. When I execute the stored procedure in SQL it returns 0 or a valid number like it should but when I try to use the webmethod listed below I keep getting a 0 even when I should get a valid number back.
ALTER PROCEDURE spGetCustSum @CustomerCode CHAR(4), @Sum AS INTEGER OUTPUT AS BEGIN......
Am I missing a step or have some wrong code in this method?
I have a service that works great on my development box. It uses JQuery to hit my web service, and then the JSON results are sent back.
The web service is located on our basePage.cs. We didn't want to put out an external WebService for this. Our on beta box something different is happening.
The web page seems to be trying to call the web method correctly - the JSON data is being sent... but the server doesn't seem to know it's a webmethod. here's my service function (it's in our basepage.cs which inherits from Page).
I'm working with the MicrosoftAjax.js libraries to make my webservice calls via javascript, right now all my services are returning basic types, like string, int, bool. can i also have my services return things like DataSets, DataTables, or custom Classes that I have built to my javascript side?
While adding the parameters to get/post request they need to be encoded in application/x-www-form-urlencoded form. So do we need to encode values each time ? Does JavaScript have any method for that ? What are the possible caches ?On server side when we read the values we do not decode them we directly say Request.Params["key"] and that returns value. Does that mean that they are automatically taken care when we read the values?
I have a ListView (in an UpdatePanel) connected to a LinqDataSource. When the page loads and/or I navigate through Postback, the code snippet (below) will display the following output:
However, when I use a few DropDownLists (also in the UpdatePanel) to filter the results (reset the DataSource to a Linq query and call DataBind), the same Contact is displayed like this:
[email.gif] [email.gif] www.adomain.com
[Code]....
If the parameter is a URL, the FormatEContact method will return:
[Code]....
So, after spending some quality time with Bing and Google, I've learned that the above js code is treated as just text and not evaluated. Therefore, the most often recommended solution is to eval() it. Unfortunately, I can't figure out exactly how, when or where to call eval().
Are there any transactions around multiple webservice calls.Let me start with a commonly used example -- the travel agency. A customer intends to create a travel plan through an online travel agency. To do this, the online travel application calls the following three Web services:
These three services are available from three separate vendors. If any one of these three services fails, the customer does not wish to proceed with the transaction (again, either all three services must succeed or none at all).My language programming is Asp.net c#.
We have a page that makes a request to a 3'rd party web service. When under heavy load this response time extends significantly, however the 3'rd party reports back that there times for processing remains constant. There timings show that from the time they receive a request to the time they send it back is always around 1.5-2.0 seconds. Now we are experiencing wait times of over 20 seconds. My understanding of ASP.NET is that each request will run on a IIS thread pool thread and make the request to the 3'rd party service return and process. So I don't really understand what could be blocking on our end. Is there something I am missing?? Is there a threshold limit beyond IIS that is blocking?
If I am missing something a physical book recommendation that covers this subject would also be a very welcome addition to any answer.
I'm writing some merge functionality in C# asp.NET MVC2. I am also using using Linq2SQL.
I have a block of code which calls two services, MessageService and UserService. These both in term call their appropriate repositories and make the amendments to the db. Each repository declares it's own instance of the repository so I'm thinking this will escalate the following code to DTC . The code is called from the AccountService, is this going to work at this level? And also is it bad practise to declare the DataContext at the top of every repository or should I pass the object around somehow? //Run the merge try { using (TransactionScope scope = new TransactionScope()) [code]....
I have an existing asp.net web application I am redesigning to use a service architecture. I have the beginnings of an WCF service which I am able to call and perform functions with no problems. As far as updating data, it all makes sense. For example, I have a button that says Submit Order, it sends the data to the service, which does the processing.
Here's my concern: If I have an ASP.NET page that shows me a list of orders (View Orders page), and at the top I have a bunch of drop down lists for order types, and other search criteria which is populated by querying different tables from the database (lookup tables, etc). I am hoping to eventually completely decouple the web application from the DB, and use data contracts to pass information between the BLL, the SOA, and the web app. With that said, how can I reduce the # of WCF calls needed to load my "View Orders" page? I would need to make 1 call get the list of orders, and 1 call for each drop down list, etc because those are populated by individual functions in my BLL.
Is it good architecture to create a web service method that returns back a specialized data contract that consists of everything you would need to display a View Orders page, in 1 shot? Something like this pseudocode:
public class ViewOrderPageDTO { public OrderDTO[] Orders { get; set; }[code].....
Or is it better practice in the page_load event to make 5 or 6 or even 15 individual calls to the SOA to get the data needed to load the page? Therefore, bypassing the need for specialized wcf methods or DTO's that conglomerate other DTO?
