Preselect an combobox item after callback

[ben]

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.

[Veselin Vasilev]

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
the Telerik team

Check out Telerik Trainer, the state of the art learning tool for Telerik products.

[ben]

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.

[Veselin Vasilev]

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
the Telerik team

Check out Telerik Trainer, the state of the art learning tool for Telerik products.