empty behavior

[David Ocasio]

the typical behavior with this control when there is no search text
is to hide the drop down

is there a way to change this
I would prefer in some cases to show all values when they have not typed anything.

thanks
dco

[Ivo]

Hello David,

This can be achieved by writing a few lines of custom code.

First of all you will have to handle the GotFocus event of the RadAutoCompleteBox and execute its Populate method giving the control's SearchText as parameter. After this you will have to create a custom filtering behavior derived from the FilteringBehavior class and override the FindMatchingItems method. Into this method you have to return all items if the string is null or empty. Here is sample code:

private void AutoCompleteBox_GotFocus(object sender, RoutedEventArgs e)
{
    var autoComplete = (RadAutoCompleteBox)sender;
    autoComplete.Populate(autoComplete.SearchText);
}

public class CustomFilteringBehavior : FilteringBehavior
{
    public override IEnumerable<object> FindMatchingItems(string searchText, System.Collections.IList items, IEnumerable<object> escapedItems, string textSearchPath, TextSearchMode textSearchMode)
    {
        if (string.IsNullOrEmpty(searchText))
        {
            return items.OfType<object>().Where(x => !escapedItems.Contains(x));
        }
        else
        {
            return base.FindMatchingItems(searchText, items, escapedItems, textSearchPath, textSearchMode);
        }
    }
}

Greetings,
Ivo
the Telerik team

[David Ocasio]

thanks ivo