Weird ComboBox Web Service Error

[Caleb Sandfort]

Hi

I'm using a webservice to populate a RadComboBox.

Here is my js:

    

function OnClientItemsRequested(sender, eventArgs) {
        var items = sender.get_items();

        if (items.get_count() == 2) {
            OpenEntityWindowFromItem(items.getItem(1), sender);
        }
    }

function HandleRequestStart(sender, eventArgs) {

var context = eventArgs.get_context();

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

}

function OnClientItemsRequestFailedHandler(sender, eventArgs) {

alert(eventArgs.get_errorMessage());

// set cancel to hide the default message

eventArgs.set_cancel(true);

}

function OnClientSelectedIndexChanged(sender, eventArgs) {

OpenEntityWindowFromItem(eventArgs.get_item(), sender);

}

Here is my markup (The web service path is set in codebehind):

<telerik:RadComboBox ID="uxRadComboBox" runat="server" EmptyMessage="Search..."
     Skin="Web20" EnableEmbeddedSkins="false"
     OnClientItemsRequesting="HandleRequestStart" OnClientSelectedIndexChanged="OnClientSelectedIndexChanged"
     OnClientItemsRequested="OnClientItemsRequested"
     EnableLoadOnDemand="true" OnClientItemsRequestFailed="OnClientItemsRequestFailedHandler">
        <WebServiceSettings Method="GetSearch" />
    </telerik:RadComboBox>

Here is my webservice method:

 [WebMethod]
        public SearchComboBoxItemData[] GetSearch(object context)
        {
          .....
        }

Here is the SearchComboBoxItemData class:

public class SearchComboBoxItemData
    {
        public string Text { get; set; }
        public string Value { get; set; }
    }

This all works fine on my local set, but on our production server when I click in the combobox, a windows explorer message box pops up saying: "There was an error processing the request."  There isn't any error published to the event viewer.  Is there anything I can do in my code to get more details about the error that is occurring, so I can fix it?

Thank You

[Simon]

Hello Caleb Sandfort,

It seems that you are missing the path to the WebService in the WebServiceSettings section of the RadComboBox definition.

Could you please try setting it and see whether things work fine?

All the best,
Simon
the Telerik team

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[Caleb Sandfort]

I'm am setting the webservice path, I'm just doing it in code behind:

protected void Page_Load(object sender, EventArgs e)
{
     this.uxRadComboBox.WebServiceSettings.Path = ResolveClientUrl("~/WebServices/SearchService.asmx");
     ........
}

[Veselin Vasilev]

Hi Caleb Sandfort,

Please try without using the ResolveClientUrl method:

protected void Page_Load(object sender, EventArgs e)
{
  this.uxRadComboBox.WebServiceSettings.Path = "~/WebServices/SearchService.asmx";
  ........
}

If it does not help - please send us a sample running project where we can observe the error.

Kind regards,
Veselin Vasilev
the Telerik team

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[Caleb Sandfort]

I tried not using ResolveClientUrl and that didn't fix it.  I would send in a sample, but I am not able to recreate it locally, it is only our production set.

I was able to get the actual error that is being thrown:

 

Invalid web service call, missing value for parameter: 'context'.

 

[Veselin Vasilev]

Hi Caleb Sandfort,

I tried to reproduce the problem but to no avail.

What is the target framework of you project and does your server have .NET 3.5 installed?
I noticed that you are using Auto-implemented properties which are available in C# 3.0+

Please find attached my sample project. It is for .Net 2.0 and does not use Auto-implemented properties. Let me know if it works on your server.

All the best,
Veselin Vasilev
the Telerik team

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Check out the tips for optimizing your support resource searches.

[Caleb Sandfort]

The sample did work on my server.

I believe I have figured out what is causing my problem, but not how to fix it.

The problem is that the application uses windows authentication, and the folder containing the web service does not, it just allows anonymous access.

Normally when we would use a web service from code behind we would just set the credentials as follows:

SearchService searchService = new SearchService();

searchService.Credentials = System.Net.

CredentialCache.DefaultCredentials;

But with the RadComboBox being called from javascript, there is no way to do this.  Is there a way in javascript or the web.config to make the call to the webservice pass the right credentials?

Thanks for all your help.

 

[Caleb Sandfort]

Hi

I've decided to forego loading items via a webservice and am just using the OnItemsRequested event.  This is serving my needs just fine.

Thanks for your time