Hide MaskedEntry Border (underline)

Environment

Version	Product
6.0.0	Telerik UI for .NET MAUI MaskedEntry

Description

This how-to article describes how you can change the appearance of the border around the component for both normal and focused states. This border is responsible for the underline beneath the input area.

Solution

The RadMaskedEntry is built on top of the RadEntry. This allows you to manage the appearance of both the border and focused border through the following properties of the internal RadEntry object:

• Properties controlling the focused state:
  • FocusedBorderBrush
  • FocusedBorderThickness
• Properties controlling the unfocused state:
  • BorderBrush
  • BorderThickness

However, you cannot directly access those properties from the RadMaskedEntry control. To achieve this, you need to define the MaskedEntry's ControlTemplate. This template is of type RadEntry, and is where you can set the new border values.

1. Confirm your view is already defining the telerik namespace:

xmlns:telerik="http://schemas.telerik.com/2022/xaml/maui"

2. Define a ControlTemplate resource in your view's Resources and use the following default MaskedEntry template:

<ControlTemplate x:Key="MyMaskedEntry_ControlTemplate">
    <telerik:RadEntry AutomationId="MaskedEntryView"
                        IsValueValid="{Binding IsValueValid, Source={x:RelativeSource AncestorType={Type telerik:RadMaskedEntryBase}}}"
                        ValidationErrorMessage="{Binding ActualValidationErrorMessage, Source={x:RelativeSource AncestorType={Type telerik:RadMaskedEntryBase}}}"
                        IsReadOnly="{Binding IsReadOnly, Source={x:RelativeSource AncestorType={Type telerik:RadMaskedEntryBase}}}"
                        IsEnabled="{Binding IsEnabled, Source={x:RelativeSource AncestorType={Type telerik:RadMaskedEntryBase}}}"
                        Placeholder="{Binding Placeholder, Source={x:RelativeSource AncestorType={Type telerik:RadMaskedEntryBase}}}"
                        FontFamily="{Binding FontFamily, Source={x:RelativeSource AncestorType={Type telerik:RadMaskedEntryBase}}}"
                        FontSize="{Binding FontSize, Source={x:RelativeSource AncestorType={Type telerik:RadMaskedEntryBase}}}"
                        ClearButtonVisibility="{Binding ClearButtonVisibility, Source={x:RelativeSource AncestorType={Type telerik:RadMaskedEntryBase}}}"
                        ClearButtonColor="{Binding ClearButtonColor, Source={x:RelativeSource AncestorType={Type telerik:RadMaskedEntryBase}}}"
                        HoveredClearButtonColor="{Binding HoveredClearButtonColor, Source={x:RelativeSource AncestorType={Type telerik:RadMaskedEntryBase}}}"
                        PressedClearButtonColor="{Binding PressedClearButtonColor, Source={x:RelativeSource AncestorType={Type telerik:RadMaskedEntryBase}}}"
                        BackgroundColor="{Binding EntryBackgroundColor, Source={x:RelativeSource AncestorType={Type telerik:RadMaskedEntryBase}}}"
                        CornerRadius="{Binding EntryCornerRadius, Source={x:RelativeSource AncestorType={Type telerik:RadMaskedEntryBase}}}"
                        TextColor="{Binding TextColor, Source={x:RelativeSource AncestorType={Type telerik:RadMaskedEntryBase}}}"
                        Keyboard="{Binding Keyboard, Source={x:RelativeSource AncestorType={Type telerik:RadMaskedEntryBase}}}"/>
</ControlTemplate>

3. Update the ControlTemplate using any desired combination of the aforementioned properties to adjust the appearance of the border. The following example uses all four (see the last four properties):

<ControlTemplate x:Key="MyMaskedEntry_ControlTemplate">
    <telerik:RadEntry AutomationId="MaskedEntryView"
                        IsValueValid="{Binding IsValueValid, Source={x:RelativeSource AncestorType={Type telerik:RadMaskedEntryBase}}}"
                        ValidationErrorMessage="{Binding ActualValidationErrorMessage, Source={x:RelativeSource AncestorType={Type telerik:RadMaskedEntryBase}}}"
                        IsReadOnly="{Binding IsReadOnly, Source={x:RelativeSource AncestorType={Type telerik:RadMaskedEntryBase}}}"
                        IsEnabled="{Binding IsEnabled, Source={x:RelativeSource AncestorType={Type telerik:RadMaskedEntryBase}}}"
                        Placeholder="{Binding Placeholder, Source={x:RelativeSource AncestorType={Type telerik:RadMaskedEntryBase}}}"
                        FontFamily="{Binding FontFamily, Source={x:RelativeSource AncestorType={Type telerik:RadMaskedEntryBase}}}"
                        FontSize="{Binding FontSize, Source={x:RelativeSource AncestorType={Type telerik:RadMaskedEntryBase}}}"
                        ClearButtonVisibility="{Binding ClearButtonVisibility, Source={x:RelativeSource AncestorType={Type telerik:RadMaskedEntryBase}}}"
                        ClearButtonColor="{Binding ClearButtonColor, Source={x:RelativeSource AncestorType={Type telerik:RadMaskedEntryBase}}}"
                        HoveredClearButtonColor="{Binding HoveredClearButtonColor, Source={x:RelativeSource AncestorType={Type telerik:RadMaskedEntryBase}}}"
                        PressedClearButtonColor="{Binding PressedClearButtonColor, Source={x:RelativeSource AncestorType={Type telerik:RadMaskedEntryBase}}}"
                        BackgroundColor="{Binding EntryBackgroundColor, Source={x:RelativeSource AncestorType={Type telerik:RadMaskedEntryBase}}}"
                        CornerRadius="{Binding EntryCornerRadius, Source={x:RelativeSource AncestorType={Type telerik:RadMaskedEntryBase}}}"
                        TextColor="{Binding TextColor, Source={x:RelativeSource AncestorType={Type telerik:RadMaskedEntryBase}}}"
                        Keyboard="{Binding Keyboard, Source={x:RelativeSource AncestorType={Type telerik:RadMaskedEntryBase}}}"
                        FocusedBorderBrush="Transparent"
                        FocusedBorderThickness="0,0,0,0" 
                        BorderBrush="Transparent"
                        BorderThickness="0,0,0,0"/>
</ControlTemplate>

4. Set your MaskedEntry's ControlTemplate property with your new resource's key:

<telerik:RadTextMaskedEntry x:Name="MyMaskedEntry"
                            ControlTemplate="{StaticResource MyMaskedEntry_ControlTemplate}"
                            ... />