AJAX :: How To Force JavaScript To Wait For Return Value From Webservice
May 12, 2010
I'm calling a web service called GetTooltip from inside Javascript. However, since the web service is called asynchronously, it doesn't wait until I get the return value from the web service, before it continues again. This is a bit of a problem for me, since the web service is in a for-loop. How do I make the Javascript wait until I hear back from the web service, before letting Javascript continue the for-loop?
I am calling a web service via Javascript. I tried it first in a web page that does not have a Masterpage and it worked perfectly. Then I moved everything over to a web page that does use a Masterpage, and I get a "Microsoft JScript runtime error: Object required" on the javascript statement that calls the web service. My javascript statements look like so:
I know i've seen a tutorial for this, but can't locate it anymore. I have a class Employee in c# side, I also have a webservice where I pass in an ID# and an Employee object is returned. Now I want this object returned to Javascript code, I know I've seen it done before, can someone point me to a tutorial that shows something like this being done. I'm using the MicrosoftAjax.js file.
I created a very simple webService using the VS2008 template. i am planning to use Ajax call for the webService.when i try to open my webservice in IE browser using following link to see the Javascript proxy, it return blank page.[URL]
I have a button that needs to check if a contact exists.I have used the Jquery ajax function to do this and I do successfully gind out if the contact exists or not.However I cannot find a way for the javascript code to wait until the ajax has finished so I can return true/false to the button for it to continue server side function. I.e.
I am trying to create a dynamic table that is being built based on the value of a search text box. The Table will have probably 6 columns of 20(max) rows.
My problem is I can't figure out how to return the data from the web-service to the JS function in a way that will allow me to extract the data that I need.
I am planning to use a Javascript call to a WebService to retrieve data from the database. At the moment I am using Ajax to do this. But since the Ajax is slowing down the performance of my application. I have read in some article that even though Ajax only refreshes the Update panel contents, Ajax does a full round trip to the server. What I need to know is how can I populate a Grid from data coming from a WebService via a Javascript call.
After watching [URL] learning guide in accessing Web Service from JavaScript[/url] I was doing the same thing in order to test it. And found out that in my JavaScript I don't have any WebService in my IntelliSense. Such thing happens if I create WebService and WebSite either in one common solution or in the different.
I have the following code where the function codeaddress geocodes the text feild value and returns geocoded value , geocoded value is stored in variable example ,how will i return the variable v2 to the function call and post to asmx webservice.
I'm calling a webservice using jQuery with .ajaxHere are the data parameters for the call:
var parameters = "{'Titre':'" + Titre + "','Description':'" + Description + "','Contact':'" + Contact + "','VilleId':'" + VilleId + "','QuartierId':'" + QuartierId + "','UserId':'" + UserId + "'}"; It works fine. But when parameters Description or Titre contain the ' character , no call!!!
Does anyone have an idea how can i make it work even with apostrophe character in Titre and/or Description?
I'm trying to pass a javascript object array back to a vb .asmx web service.
I can't even tell you how many different things I've tried, so i'm confused more than when I started. Below is an example of the client side code I am using.
[Code]....
I'm adding my script reference in my vb page as follows, and can access other web methods fine.
[Code]....
how to be able to access these objects within the web service method. I need to be able to iterate though all the people from the javascripts array so that I can do some other functions, such as validation, adding them to a database, etc.
I've tried a bunch of different examples and still can't get this to work. I have a jQuery GalleryView control I'm using and I simply want to log impressions. I set up a webservice that works, but I can't figure out how to get it to work in javascript. I have verified that the webservice is working as expected.
I have a page that calls a webservice from JavaScript using the approach described in this article: [URL]
This is working fine. The problem is when the page causes a postback before the end of the execution of the webservice's method. When that happens, the succeeded callback method never gets called. Does anyone know if there's a workaround to this?
i have a question about web service and the method that can i use to return the results in xml format. MY SCENARIO IS THE FOLLOW: I have 2 projects: the first is my aspx site and the seconds is my web service. The web service make query to sql database and generate xml file contains the results, and it stored on the webservice's server. My client call web service, that generate xml file, and after my client read the xml file stored to server (by xml reader) and view the results.... Is it correct? For me no. i think that when i call my web service, exist a method that it return xml file instantly, like a stream or like a query. is it true? (i don't know) But the problem is that i don't know how soap works and i don't found any code example.
Configuration : Windows Vista,VS 2005,Ajax v1.0.61025 My Html Page
<html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <title>Untitled Page</title> <script language="javascript" type="text/javascript"> function fnCall() { try { var ans= Sim.Service.HelloWorld(OnMethodSucceeded, OnMethodFailed); } catch(e) { alert(e.message); } } function OnMethodSucceeded(result) { alert('a'); } function OnMethodFailed(result) { alert('b'); } </script> </head> <body> <form id="form1" runat="server"> <asp:ScriptManager ID="ScriptManager1" runat="server" ><Services> <asp:ServiceReference Path="http://localhost/ajaxtest/service.asmx" /></Services> </asp:ScriptManager> <div><input id="Button1" type="button" value="button" onclick="fnCall();" /></div> </form> </body> </html> Web Service CS. using System; using System.Web; using System.Web.Services; using System.Web.Services.Protocols; using System.Web.Script.Services; namespace Sim { [WebService(Namespace = "http://tempuri.org/")] [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)] [System.ComponentModel.ToolboxItem(false)] // To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line. [System.Web.Script.Services.ScriptService] public class Service : System.Web.Services.WebService { public Service() { //Uncomment the following line if using designed components //InitializeComponent(); } [WebMethod,ScriptMethod(UseHttpGet=true)] public string HelloWorld() { return "Hello World"; } } }
But i am getting Sim is not defined. Error. post ur comments. I have reviewed most of the forums. I am not able to clear
I wanted to use using database to populated the dropdownbut i am getting error as type or list space cannot be foundat ListCountry GetCountriesas its defined staticthe web methood code is in the same aspx.cs pagehow culd i use it if a different webmethod page .asmx is created
I get this error "The server method xxx timed out." calling a WebService that internally does a hard query to the database, and takes some time. I use this method to change the webservice timeout, but it does not seems to do anything (the timeout errors appears in less than a second). MyService.set_timeout(100000);
I have a web user control. That I load dynamicaly inside a modalpopup window using dynamic populate extender. User control has a external javascript file linked to it. Problem: I cannot make call to webservice method from this external javascript file. When I make a call -- servicename.methodname() I get servicename not defined error.
Pinging back to a webservice in ajax from the client keeps the user's session alive, I don't want this to happen. More extensive summary For a website we're developing, we need the client to ping back (in js) to a webservice (ASMX) on the server (IIS7.5). This happens to let the server know that the user is still on the site, and hasn't browsed away to another site. This is as our customer wants to let users lock records, but if they browse away to other sites, then let other people take over those locked records. Perhaps the distinction between the client being on the site but inactive and on another site seems unimportant, but that's kinda irrelevant, I don't get to write the UI spec, I just have to make it work.
My problem is this, the ping stops the user from being timed out on the server through the standard forms authentication timeout mechanism. Not surprising as there is that 30 second ping in the background keeping the session alive. Even though we want to know if the user is still on the site, we want the normal forms authentication timeout mechanism to be honoured. I thought I might be able to fix this by removing the ASP.NET_SessionId and .ASPXAUTH cookies in the XMLHttpRequest that is the server ping, but I can't figure out how to do this. This is how my web service & method are defined:
[WebService(Namespace = "http://tempuri.org/")] [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)] [ScriptService] public class PingWS : WebService { [WebMethod] public void SessionActive(string sessionID) { // does stuff here } This is how I'm calling it in js (request is over HTTPS, : $.ajax({ type: "POST", url: "PingWS.asmx/SessionActive", data: 'sessionID=' + aspSessionID + '}', beforeSend: function (xhr) { xhr.setRequestHeader('Cookie', ''); xhr.setRequestHeader('Cookie', 'ASP.NET_SessionId=aaa; .ASPXAUTH=bbb;'); }, dataType: "json" });
I was trying with the setRequestHeader, but that just appends to the header rather than overwrites the header, and IIS is happy to ignore that junk I added. I'm thinking maybe I should be trying to do this at the server end, someone take PingWS.asmx out of the loop so that it doesn't keep the session active, but I'm not sure how to do this. Although the title of the question is focused on clearing the cookie in the header, I'd be super happy if anyone points out that I'm being really stupid and there is actually a much better way of trying to do what I'm doing.
I'm thinking at this stage maybe I need to add something to the webmethod that says how long this particular page has been inactive, and use that knowledge to timeout manually. That actually sounds pretty easy, so I think I'll do that for now. I'm still convinced that there must be an easy way to do what I originally wanted to do though. Update I'm thinking I'm pretty screwed in terms of cookie manipulation here as both the .ASPXAUTH and ASP.NETSessionId cookie are HttpOnly, which means the browser takes them out of your hands, you can't access them via the document.cookies object. So I would say that leaves me with:
Updating my SessionAlive webmethod to track each request so I can tell how long the user has been sitting idle on a page and timeout if needs be Marking the .asmx page somehow on the server end so that it's taken out of the normal authentication/session tracking flow I know how to do 1. so I'll start there but 2. seems much cleaner to me.
I have a simple question - I use update panel with custom server control inside. I call __doPostBack from javascript and RaisePostBackEvent on the server fires (I implement IPostBackEventHandler).This is client to server call. Could I return data back to the client (after this partial postback)? What is the best way to achieve this?
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?
