How to display default text "--Select Team --" in combo box on pageload in WPF?

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In a WPF app, in MVP app, I have a combo box,for which I display the data fetched from Database. Before the items added to the Combo box, I want to display the default text such as

" -- Select Team --"

so that on pageload it displays and on selecting it the text should be cleared and the items should be displayed.

Selecting data from DB is happening. I need to display the default text until the user selects an item from combo box.

Please guide me

The easiest way I've found to do this is:

<ComboBox Name="MyComboBox"
 IsEditable="True"
 IsReadOnly="True"
 Text="-- Select Team --" />

You'll obviously need to add your other options, but this is probably the simplest way to do it.

There is however one downside to this method which is while the text inside your combo box will not be editable, it is still selectable. However, given the poor quality and complexity of every alternative I've found to date, this is probably the best option out there.

What is the way set default text inside textbox in HTML?, You can use the value attribute for the default text. But if you want to display something only to make the user aware of the data to be filled in the text field try  You can use the value attribute for the default text. But if you want to display something only to make the user aware of the data to be filled in the text field try using placeholder attribute. 1.4k views · View 1 Upvoter

You can do this without any code behind by using a IValueConverter.

<Grid>
   <ComboBox
       x:Name="comboBox1"
       ItemsSource="{Binding MyItemSource}"  />
   <TextBlock
       Visibility="{Binding SelectedItem, ElementName=comboBox1, Converter={StaticResource NullToVisibilityConverter}}"
       IsHitTestVisible="False"
       Text="... Select Team ..." />
</Grid>

Here you have the converter class that you can re-use.

public class NullToVisibilityConverter : IValueConverter
{
    #region Implementation of IValueConverter

    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        return value == null ? Visibility.Visible : Visibility.Collapsed;
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        throw new NotImplementedException();
    }

    #endregion
}

And finally, you need to declare your converter in a resource section.

<Converters:NullToVisibilityConverter x:Key="NullToVisibilityConverter" />

Where Converters is the place you have placed the converter class. An example is:

xmlns:Converters="clr-namespace:MyProject.Resources.Converters"

The very nice thing about this approach is no repetition of code in your code behind.

How to display a default text in a Custom Field th, I am trying to load a default value in a Custom Field(Textbox) by adding javascript code in description of that particular field. But the text does not  html:default text display in a textbox. I need to put default text that should hide on onfocus.I can`t use "PlaceHolder" attribute. HOw can I do it here???Please

I like Tri Q's answer, but those value converters are a pain to use. PaulB did it with an event handler, but that's also unnecessary. Here's a pure XAML solution:

<ContentControl Content="{Binding YourChoices}">
    <ContentControl.ContentTemplate>
        <DataTemplate>
            <Grid>
                <ComboBox x:Name="cb" ItemsSource="{Binding}"/>
                <TextBlock x:Name="tb" Text="Select Something" IsHitTestVisible="False" Visibility="Hidden"/>
            </Grid>
            <DataTemplate.Triggers>
                <Trigger SourceName="cb" Property="SelectedItem" Value="{x:Null}">
                    <Setter TargetName="tb" Property="Visibility" Value="Visible"/>
                </Trigger>
            </DataTemplate.Triggers>
        </DataTemplate>
    </ContentControl.ContentTemplate> 
</ContentControl>

If field is empty, default text shows (PDF Forms), What I need is for the default text to disappear on focus, then if the text box is left empty, for the default event.value = '[Write the text what you want to display]'; Enter or display text if cells are blank with Go To Special command Step 1: Select the range in which you will enter or display text if cells are blank. Step 2: Click the Home > Find & Select > Go to Special . Step 3: In the opening Go To Special dialog box, only check the Blanks option, Step

No one said a pure xaml solution has to be complicated. Here's a simple one, with 1 data trigger on the text box. Margin and position as desired

<Grid>
    <ComboBox x:Name="mybox" ItemsSource="{Binding}"/>
    <TextBlock Text="Select Something" IsHitTestVisible="False">
           <TextBlock.Style>
                <Style TargetType="TextBlock">
                      <Setter Property="Visibility" Value="Hidden"/>
                      <Style.Triggers>
                            <DataTrigger Binding="{Binding ElementName=mybox,Path=SelectedItem}" Value="{x:Null}">
                                  <Setter Property="Visibility" Value="Visible"/>
                             </DataTrigger>
                      </Style.Triggers>
                </Style>
           </TextBlock.Style>
     </TextBlock>
</Grid>

How to Display a Default Text on Combobox, I'm trying to figure out how to have default text show in a form field/text field until the user clicks on it and inputs their own event.target.display = display.visible;. The display property specifies the display behavior (the type of rendering box) of an element. In HTML, the default display property value is taken from the HTML specifications or from the browser/user default style sheet. The default value in XML is inline, including SVG elements.

Set IsEditable="True" on the ComboBox element. This will display the Text property of the ComboBox.

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Comments
  • Great answer Chris! I would just add Focusable="True", but that is just cosmetic change.
  • perfect answer Chris. One property can do such a big difference :D
  • Focusable="False" IsEditable="True" IsReadOnly="True"
  • +1. Unfortunatelly it does not work with mixed items (for example if combobox items are images).
  • Simple and working solution. WPF controls have this kind of problems all over the framework. Here and there, controls are missing features that most developers would need. As the result, developers waste their time searching for solutions, buying third-party alternative controls, or implementing workarounds... Does the WPF team even use their controls for their own developments?
  • I would like to use this, but seems it is not allowed in the cases that the combobox is the header of a datagrid . . . XAML gives an error that the header is already defined (or perhaps cannot be defined more than once). Any ideas? I am thinking just to use a null value option, which will then allow for a reset by selecting it, but seems a little sloppy.
  • A big reason this is an excellent solution is because just about every data-bound WPF project makes use of a NullToVisibilityConverter so it's already there most of the time - might as well make use of it!
  • Actually you can use a DataTrigger to avoid even the converter code here :)
  • I needed to move the "Visibility="Hidden" into the data trigger. then it worked as expected. Definitely the most straigh forward approach I've seen. For reuseability, I moved the style into a resource
  • @Mitch IceForce's answer isnt working for me, what did you change to get it working?
  • @Chris I think he meant adding <Setter Property="Visibility" Value="Hidden"/> outside the trigger (inside the style) and removing Visibility="Hidden" from the actual textblock element
  • @Mitch, how do you move the Textblock style into a resource for reuse if you have the ElementName in the DataTrigger pointing to a specific object (mybox)? Is there any way to specify that name in a generic way?
  • This is the simplest solution out of the whole lot.