Alert needed on losing focus from Editable Rdcombox if text entered does not match

[Manishkumar]

Hi,


I have radcombobox which is

IsEditable="True"
IsTextSearchEnabled="True"
TextSearchMode="StartsWith"

 
Now when user enters some text which is not present in the list that is binded to the radcombobox and the radcombobox loses focus, i want a alert which tells users that value entered is not available and clears the text entered in the radcombobox.

Please guide.

 

[Yana]

Hi Manishkumar,

Please find attached a simple example which demonstrates how you can implement validation in RadComboBox.

Hope it helps.

All the best,
Yana
the Telerik team

[Manishkumar]

Hi Yana,

Thanks for replying.
The example provided is not helping though. I can enter wrong values in the radcombobox and even on losing focus, no alert is thrown to the user.

[Yana]

Hello Manishkumar,

I've modified the XAML from the project to show how to set ErrorTemplate:

<Window.Resources>
    <ControlTemplate x:Key="ErrorTemplate">
        <DockPanel LastChildFill="True">
            <TextBlock DockPanel.Dock="Top"
                        Text="{Binding ElementName=comboBox,Path=AdornedElement.(Validation.Errors)[0].ErrorContent}"
                        Foreground="Red"
                        FontWeight="Bold"/>
            <Border BorderBrush="Red" BorderThickness="1">
                <AdornedElementPlaceholder Name="comboBox" />
            </Border>
        </DockPanel>
    </ControlTemplate>
</Window.Resources>
<Grid>
    <Grid.RowDefinitions>
        <RowDefinition Height="100" />
        <RowDefinition Height="50" />
    </Grid.RowDefinitions>
        <telerik:RadComboBox x:Name="comboBox" IsEditable="True" Width="300" Height="22"
                        IsTextSearchEnabled="True"
                        TextSearchMode="StartsWith"
                        ItemsSource="{Binding Items}"
                        SelectedValue="{Binding SelectedItem, Mode=TwoWay,NotifyOnValidationError=True, ValidatesOnDataErrors=True}"
                        Validation.ErrorTemplate="{StaticResource ErrorTemplate}"       />
        <Button Content="click" Grid.Row="1" Width="50" Height="22" />
</Grid>

Hope this helps.

All the best,
Yana
the Telerik team