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populated using webservice +LoadOnDemand

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Łukasz Kuryło
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Łukasz Kuryło asked on 23 Mar 2010, 12:44 PM
Hi all.
I have a combobox populated using webservice with LoadOnDemand. My question is how can I select one specific element in combobox when it is populated?
And my second question. The combobox is populated only when I click on the drop down array icon. I would like to populate it when the page is load (or the control is load).How can I do that?

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Telerik team
answered on 26 Mar 2010, 10:41 AM
Hi Łukasz Kuryło,

When Load On Demand feature is enabled, the RadComboBox populates with data after user types in the input area or clicks on the drop-down toggle image.
I am not sure that I understand your requirement, but in case like this you will be not able to predict what values will be populated in order to set a default selected value.

There is an option to set the selected index client side at OnClientItemsRequested event:
function OnClientItemsRequestedHandler(sender, eventArgs)
    var combo = $find("<%=RadComboBox1.ClientID %>");
    if (sender.get_items().get_count() > 2) {

<telerik:RadComboBox ID="RadComboBox1" runat="server" Height="100px" Width="220px"
    ShowMoreResultsBox="true" EnableLoadOnDemand="True" 
    OnClientItemsRequested="OnClientItemsRequestedHandler" >
    <WebServiceSettings Path="LoadItemsWebService.asmx" Method="GetCompanyNames" />

To fire the web service method and load the items when the page loads you can use the requestItems method of the combobox:

Sys.Application.add_load(function() {
   var combo = $find("<%= RadComboBox1.ClientID %>");
   //invoke the webMethod, e.Text would be empty string
   combo.requestItems("", false);

More details you can find at sample page attached.
Please let me know if this was helpful.

Kind regards,
the Telerik team

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Łukasz Kuryło
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