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Preselect an combobox item after callback

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ComboBox
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ben
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ben asked on 29 Jul 2008, 03:09 PM
Hello all,

I have code on the server-side that populates a combobox during the ItemsRequested event.  This code also knows what value should be preselected after the combobox has been populated.  I tried selecting the item programmatically but it doesn't seem to have any effect on the client.

I know I can also handle the OnClientItemsRequested event and select a item on the client-side after the callback is done.  However, the info i need (what item to select) is on the server-side and I don't know how to pass it back to the client.

Any ideas how this can be done?

Thanks.

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Veselin Vasilev
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answered on 29 Jul 2008, 03:44 PM
Hello ben,

Welcome to Telerik Community!

You cannot set the selected item in the ItemsRequested event, but you can set a custom attribute for the selected item there and in the OnClientItemsRequested handler to check for that attribute and select the item:

    protected void RadComboBox1_ItemsRequested(object o, Telerik.Web.UI.RadComboBoxItemsRequestedEventArgs e) 
    { 
        RadComboBoxItem item = new RadComboBoxItem("item 1"); 
        RadComboBox1.Items.Add(item); 
 
        item = new RadComboBoxItem("selected item"); 
        item.Attributes["isSelected"] = "true"; 
        RadComboBox1.Items.Add(item); 
    } 

function OnClientItemsRequestedHandler(sender, eventArgs) 
    var items = sender.get_items(); 
     
    for (var i = 0; i < items.get_count(); i++) 
    { 
        if (items.getItem(i).get_attributes().getAttribute("isSelected") == "true"
        { 
            items.getItem(i).select(); 
            break
        } 
    } 

I hope this helps.

Regards,
Veskoni
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ben
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answered on 30 Jul 2008, 07:52 AM
Thanks a lot.  That's exactly what I was looking for.  But now the next problem I'm having is this.  After the callback has been made and combobox repopulated, the user will click on a button to post the form.  How do I get the selected value?  It looks like the selected item was the old one before the callback was made.
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Veselin Vasilev
Telerik team
answered on 30 Jul 2008, 02:19 PM
Hello ben,

The SelectedValue should do the work.

I have attached my test page. Let me know what is different in your case.


Greetings,
Veskoni
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