[Solved] client-side load not displaying items

[Joel Brom]

Using your example for Performance with Web Services.  My app returns 8000+ items from the service and loads in < 10 seconds.  Yet the RCB appears empty after loading.  What am I mssing?

    function RequestingLoadofCombo(sender, eventArgs)
    {
        eventArgs.get_context()["DivID"] = RowDivID;
        eventArgs.get_context()["Type"] = ContactType;
    }
    function Loaded()
    {
        alert("Loaded");
    }


                <telerik:RadComboBox ID="NonMembersComboBox" runat="server"
                         Height="100px" Width="220px" ShowMoreResultsBox="true" MarkFirstMatch="true"
                         EnableLoadOnDemand="True" OnClientItemsRequesting="RequestingLoadofCombo"
                         OnClientItemsRequested="Loaded">
                <WebServiceSettings Method="LoadCombo" Path="Admin.aspx" />
                 </telerik:RadComboBox>

public class ComboBoxItemData
{
    private string text;

        public string Text
        {
            get { return text; }
            set { text = value; }
        }
    }

    public static RadComboBoxData LoadCombo(RadComboBoxContext context)
    {
        int divID = (int)(context["DivID"]);
        string typeString = (string)(context["Type"]);
        char type = Convert.ToChar(typeString);
        RadComboBoxData result = new RadComboBoxData();
        List<RadComboBoxItemData> items = new List<RadComboBoxItemData>();
        List<string> list = new List<string>();
        Contacts c = new Contacts();
        list = c.GetNonContacts(divID, type);
        foreach (string id in list)
        {
            RadComboBoxItemData itemData = new RadComboBoxItemData();
            itemData.Text = id;
            items.Add(itemData);
        }

        result.Items = items.ToArray();
        result.EndOfItems = true;

        return result;
    }

[Kalina]

Hi Joel Brom,

The code snippets that you sent to us give just a partial representation of the issue, so I had to guess how your code works and what the issue itself can be.

I made for you a small example to illustrate the approach that resolves the issue - naturally you can extend it to fit it in your application.

Note: The web method that you call seems to use a custom library that I don't have here, so I simulated 8000 Items and made a loop to make the method return them in portions. As I don't know what are RowDivID and ContactType variables I just passed them to the context.

<script type="text/javascript" language="javascript">
    var RowDivID = 1;
    var ContactType = 1;
    function RequestingLoadofCombo(sender, eventArgs) {

        var context = eventArgs.get_context();
        context["DivID"] = RowDivID;
        context["Type"] = ContactType;
    }
</script>

<telerik:RadComboBox ID="NonMembersComboBox" runat="server" Height="100px" Width="220px"
    ShowMoreResultsBox="true" MarkFirstMatch="true" EnableLoadOnDemand="True"
    OnClientItemsRequesting="RequestingLoadofCombo">
    <WebServiceSettings Path="LoadItemsWebService.asmx" Method="GetCompanyNames" />
</telerik:RadComboBox>

private const int ItemsPerRequest = 10;
[WebMethod]
public  RadComboBoxData GetCompanyNames(RadComboBoxContext context)
{
    int dataRowsCount = 8000;
    RadComboBoxData comboData = new RadComboBoxData();
    int itemOffset = context.NumberOfItems;
    int endOffset = Math.Min(itemOffset + ItemsPerRequest, dataRowsCount);
    comboData.EndOfItems = endOffset == dataRowsCount;

    List<RadComboBoxItemData> result = new List<RadComboBoxItemData>(endOffset - itemOffset);

    for (int i = itemOffset; i < endOffset; i++)
    {
        RadComboBoxItemData itemData = new RadComboBoxItemData();
        itemData.Text = "itemNo"+i.ToString();
        itemData.Value = i.ToString();

        result.Add(itemData);
    }
    comboData.Items = result.ToArray();
    return comboData;
}

If the issue persists, could you send us sample runnable code, which does not use custom libraries or databases?

Thank you in advance.

Greetings,
Kalina
the Telerik team

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[Joel Brom]

Thank you for the example.  I have redesigned my application to use an AJAX autocomplete extender which worked out to be a better solution.