Validating / Styling

[Martin Egger]

Hi

I have a small problem. When I validate a TextBoxes Value and than giving the User a visual feedback everything works prefectly fine.

When I do this with a RadComboBox, the only thing that works is the validation part. But I don't get any visual feedback. Here is the XAML part in my App.xaml

<Application x:Class="CDM.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"
             xmlns:telerikInput="clr-namespace:Telerik.Windows.Controls;assembly=Telerik.Windows.Controls.Input"
             >
    <Application.Resources>
    <Storyboard x:Key="FlashError">
            <ObjectAnimationUsingKeyFrames BeginTime="00:00:00"
                                       Storyboard.TargetProperty="(UIElement.Visibility)">
                <DiscreteObjectKeyFrame KeyTime="00:00:00" Value="{x:Static Visibility.Visible}"/>
                <DiscreteObjectKeyFrame KeyTime="00:00:05" Value="{x:Static Visibility.Hidden}"/>
            </ObjectAnimationUsingKeyFrames>
        </Storyboard>
    <Style x:Key="myErrorTemplate" TargetType="Control">
        <Setter Property="Validation.ErrorTemplate">
            <Setter.Value>
                <ControlTemplate>
                    <StackPanel Orientation="Vertical">
                        <Border BorderBrush="Red" BorderThickness="1">
                            <AdornedElementPlaceholder Name="mycontrol">

                                <Label Foreground="White" Background="Red"
                                           Content="{Binding ElementName=mycontrol,
                                                     Path=AdornedElement.(Validation.Errors)[0].ErrorContent}">
                                        <Label.Triggers>
                                            <EventTrigger RoutedEvent="FrameworkElement.Loaded">
                                                <BeginStoryboard Storyboard="{StaticResource FlashError}" />
                                            </EventTrigger>
                                        </Label.Triggers>
                                    </Label>
                            </AdornedElementPlaceholder>
                        </Border>

                        <!--<Label Foreground="White" Background="Red"
                                           Content="{Binding ElementName=mycontrol,
                                                     Path=AdornedElement.(Validation.Errors)[0].ErrorContent}">
                        </Label>-->
                    </StackPanel>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
        <Style.Triggers>

            <Trigger Property="Validation.HasError" Value="true">
                <Setter Property="ToolTip"
                            Value="{Binding
                                    RelativeSource={x:Static RelativeSource.Self},
                                    Path=(Validation.Errors)[0].ErrorContent}" />
            </Trigger>
        </Style.Triggers>
    </Style>

      <Style TargetType="TextBox" BasedOn="{StaticResource myErrorTemplate}" />
    <Style TargetType="CheckBox" BasedOn="{StaticResource myErrorTemplate}" />
        <Style TargetType="telerik:RadComboBox" BasedOn="{StaticResource myErrorTemplate}" />
    </Application.Resources>
</Application>

And here the the C# Part for Validation. Allthough I am convincied that the validation works. Tested it several times.

    public Platten()
        {
            this.preisReference.AssociationChanged += new CollectionChangeEventHandler(preisReference_AssociationChanged);

            this.AddError("preis", "Preiscode fehlt!");
        }

        void preisReference_AssociationChanged(object sender, CollectionChangeEventArgs e)
        {
            if (e.Action == CollectionChangeAction.Remove)
            {
                OnPropertyChanging("preis");
            }
            else
            {
                if (e.Action == CollectionChangeAction.Add)
                {
                    this.RemoveError("preis");
                }
                OnPropertyChanged("preis");
            }
        }


        #region IDataErrorInfo Members
        private Dictionary<string, string> m_validationErrors = new Dictionary<string, string>();

        private void AddError(string columnName, string msg)
        {
            if (!m_validationErrors.ContainsKey(columnName))
            {
                m_validationErrors.Add(columnName, msg);
            }
        }

        private void RemoveError(string columnName)
        {
            if (m_validationErrors.ContainsKey(columnName))
            {
                m_validationErrors.Remove(columnName);
            }
        }

        public bool HasErrors
        {
            get { return m_validationErrors.Count > 0; }
        }

        public string Error
        {
            get
            {
                if (m_validationErrors.Count > 0)
                {
                    return "Customer data is invalid";
                }
                else
                {
                    return null;
                }
            }
        }

        public string this[string columnName]
        {
            get
            {
                if (m_validationErrors.ContainsKey(columnName))
                {
                    return m_validationErrors[columnName];
                }
                else return null;
            }
        }
        #endregion

Thanks for your help.

[Hristo]

Hello Martin Egger,

We are unable to run your project because there are missing parts.
Could you send us sample project (you have to open a support ticket in order to attach files) so that we can be sure that we are working on the same issue?

Kind regards,
Hristo
the Telerik team

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