Web Service- how to add data to context object

[Andrew]

When you load on demand from a Web Service, is there a way to add fields to the "context" argument? In my test it contains only "NumberOfItems" and "Text".
Ideally I would like to gather more info about the calling RadCombo. Help anyone?

Thank you
Andrew

[Nikolay]

Hi Andrew,

You can refer to the Populate from WebService example and see how the text of the input field is passed to the context object. The same way you can pass other information about the combobox:

function itemRequesting(sender, eventArgs)

{

var context = eventArgs.get_context();

context["Filter"] = sender.get_text();

}

Hope this helps.

Regards,
Nick
the Telerik team

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[Andrew]

Great, thanks

[Nesim]

Hi,
I did all like the sample but i get the failed error. No explaining :( 
The HTML Codes:

<telerik:RadComboBox ID="rcbMusteriler" runat="server" CustomText="True" AutoPostBack="False" EmptyMessage="Müşteri İsmi Giriniz" EnableLoadOnDemand="True" EnableVirtualScrolling="True" LoadingMessage="Arıyor ..." MarkFirstMatch="True" OnSelectedIndexChanged="rcbMusteriler_SelectedIndexChanged" OnClientItemsRequesting="itemRequesting" OpenDropDownOnLoad="True"> <WebServiceSettings Method="GetMusteriler" Path="Musteriler.asmx" /> <CollapseAnimation Duration="200" Type="OutQuint" /> </telerik:RadComboBox>

The JavaScript Codes:

<script language="javascript" type="text/javascript">
    function itemRequesting(sender, eventArgs)
{
    var context = eventArgs.get_context();
    context["Filter"] = sender.get_text();
}
</script>

And The WebService Codes:

	<Script.Services.ScriptService()> _
	Public Class WebServiceName
	Inherits WebService
	<WebMethod()> _
	Public Function GetMusteriler(ByVal context As Object) As Telerik.Web.UI.RadComboBoxItemData()
	Dim oDatas(2) As Telerik.Web.UI.RadComboBoxItemData
	Dim sMstAdi As String = context.ToString
	If sMstAdi.Length > 2 Then
	Dim ta As New DataAccess.KULLANICITableAdapters.ButunKullanicilarTableAdapter
	Dim dt As DataAccess.KULLANICI.ButunKullanicilarDataTable = ta.GetDataByAdSoyad(sMstAdi)
	ReDim oDatas(dt.Rows.Count - 1)
	Dim dr As DataAccess.KULLANICI.ButunKullanicilarRow
	For i As Integer = 0 To dt.Rows.Count - 1
	dr = dt.Rows(i)
	oDatas(i).Text = dr.ADISOYADI
	oDatas(i).Value = dr.KULLANICI_ID
	Next
	End If
	Return oDatas
	End Function
	End Class

[Veselin Vasilev]

Hello Nesim,

I think that the problem might be related to the fact that you are using context.ToString()

I suggest that you examine these online resources:

• Loading Items from a Web Service help article
• Populate from WebService online example

I hope this helps.

Sincerely yours,
Veskoni
the Telerik team

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[Nesim]

Hello Veskoni,
I can't debug it what context returns becasue it doesn't hit when i breakpoint in vs. the event doesn't raise. webservice event.  i tried to convert idictionary the context data. 

Dim dicCon As IDictionary = context
Dim sMstAdi As String = dicCon("Filter").ToString

Nothing different. Same Problem. The server method "GetMusteriler" failed.
I got the text from javascript. 

alert(sender.get_text());

it works ... but i need to more details.

How can i get detailed error exception? Or Stack trace ...

Thanks a lot

[Veselin Vasilev]

Hi Nesim,

You can subscribe to the OnClientItemsRequestFailed event and examine the error message by calling eventArgs.get_errorMessage() method.

Regards,
Veskoni
the Telerik team

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