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Placeholder Textbox Windows Phone 8??

+2 votes

How to create place holder Textbox in windows phone 8 application

posted Oct 13, 2014 by Sathish Kumar

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1 Answer

+3 votes

PaceHolder TextBox:

    This technique uses the Background property to show / hide placeholder textbox.
    Advantage is that Placeholder is shown event when Textbox has the focus

How it works:

              When textbox has a value, background set to White to cover up PlaceHolder text.
              When textbox is empty, background becomes Transparent to show PlaceHolder text.

Design Code:

            <ux:NotEmptyConverter x:Key="NotEmptyConverter" />

           <Style TargetType="{x:Type Control}" x:Key="DefaultStyle">
            <Setter Property="FontSize" Value="20" />
            <Setter Property="Margin" Value="10"/>
            <Setter Property="VerticalAlignment" Value="Center"></Setter>
            <Setter Property="VerticalContentAlignment" Value="Center"></Setter>

        <Style TargetType="{x:Type TextBox}" BasedOn="{StaticResource DefaultStyle}"></Style>


        <RowDefinition Height="Auto"/>
    <TextBox Grid.Row="0" Text="Placeholder Text Is Here" Foreground="DarkGray" />
    <TextBox Grid.Row="0" Name="TextBoxEdit" 
            Text="{Binding Path=FirstName, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" >
            <Style TargetType="{x:Type TextBox}" BasedOn="{StaticResource DefaultStyle}">
                    <DataTrigger Binding="{Binding Path=FirstName.Length, FallbackValue=0, TargetNullValue=0}" Value="0">
                        <Setter Property="Background" Value="Transparent"/>
                    <DataTrigger Binding="{Binding Path=FirstName, FallbackValue=0, TargetNullValue=0, Converter={StaticResource NotEmptyConverter}}" Value="false">
                        <Setter Property="Background" Value="White"/>

// Corresponding value converter to detect non-empty string

public class NotEmptyConverter : IValueConverter
    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        var s = value as string;
        return string.IsNullOrEmpty(s);
    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        return null;
answer Oct 15, 2014 by Jdk
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