Calling a web service from javascript at page load

I need to call a web service at page load from javascript. I have several other web services that are successfully called on other occasions (when leaving a text input field for example).

I suspect the reference by the script manager to the services aren't done at the moment of the call (when the page load). The service is working fine when called from another "event handler" i.e. whenever input events are fired. Also, any service I try to call at page load failed to be called.

So, do I guess right? What can I do to get my call to work?

I'm using April CTP

Thank you all in advance

Check thishttp://atlas.asp.net/docs/atlas/doc/services/exposing.aspx

look for Calling Web Services When a Page Loads, hope this helps.

Thank you very much... I should have look twice in the documentation

The documentation doesn't exist anymore, and the trick it suggested no longer works on Beta 2:

<scripttype="text/xml-script">
<page xmlns:script="http://schemas.microsoft.com/xml-script/2005">
<references>
</references>
<components>
<application id="application" load="OnApplicationLoad" />
</components>
</page>
</script>

What's an alternative way to do this besides using setTimeout to wait some arbitrary number of seconds before calling that javascript function "OnApplicationLoad"?

call webservce

Hi

i try to call a webservice when form load,but i can't

my code like

<form id="f" onload = "callService()>

<script language = "javascript">

function callServicce()

{..........}

</script>

</form>

please help me ??

thank you

You need to register your webservice using ScriptManager and ServiceReference.
Here are examples of the webservice and javascript code which calls the webservice. Method DoSearch is calling the webservice method

Webservice in (Webservice.asmx)

[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
[ScriptService] //If this is not added, then it is not possible to generate javascript proxy.
public class MyWebService : System.Web.Services.WebService {

[WebMethod]
public string HelloWorld(string query)
{
string inputString = Server.HtmlEncode(query);
if (!String.IsNullOrEmpty(inputString))
{
return String.Format("Hello, you queried for {0}. The "
+ "current time is {1}", inputString, DateTime.Now);
}
else
{
return "The query string was null or empty";
}

}

}

JavaScript snippet:

<form id="Form1" runat="server">
<asp:ScriptManager runat="server" ID="scriptManager">
<Services>
<asp:ServiceReference path="~/WebService.asmx" />
</Services>
</asp:ScriptManager>
<div>
Search for
<input id="SearchKey" type="text" />
<input id="SearchButton" type="button" value="Search"
onclick="DoSearch()" />
</div>
</form>
<hr style="width: 300px" />
<div>
<span id="Results"></span>
</div>

<script type="text/javascript">

function DoSearch()
{
var SrchElem = document.getElementById("SearchKey");
MyWebService.HelloWorld(SrchElem.value, OnRequestComplete);
}

function OnRequestComplete(result)
{
var RsltElem = document.getElementById("Results");
RsltElem.innerHTML = result;
}

</script>

Hope this helps

thanks for your reply

but my question is how to call webservice on formload event ?

i already do what you show,but webservice could'n to be call on form load event

Ajax, your code looks fine. Perhaps you could post your entire script so we can debug further?
I think you could try ScriptManager1.RegisterClientScriptBlock method in Page_Load Event.