Home / Community & Support / Developer Productivity Tools Forums / WPF > ComboBox > Alert needed on losing focus from Editable Rdcombox if text entered does not match

• Manishkumar Master

  Posted on Nov 15, 2011 (permalink)

  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.

   

  Reply

• Yana Yana

  Posted on Nov 16, 2011 (permalink)

  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

  Explore the entire Telerik portfolio by downloading the Ultimate Collection trial package. Get it now >>

  Attached files

  • ComboBoxValidation.zip

  Reply

• Manishkumar Master

  Posted on Nov 18, 2011 (permalink)

  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.

  Reply

• Yana Yana

  Posted on Nov 21, 2011 (permalink)

  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

  Explore the entire Telerik portfolio by downloading the Ultimate Collection trial package. Get it now >>

  Reply

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