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How to have null values in NumericTextBox

Platform: Xamarin.Forms |
Control: SfNumericTextBox |
Published Date: March 24, 2017 |
Last Revised Date: July 4, 2019

The Null values can be set in SfNumericTextBox “Value” property by setting the AllowNull property value to True. By default, the property value is “false”.

 

The following code example will help to have null values in NumericTextBox

 

Code Snippet

C# Code

 

namespace KBSolution
{
public partial class KBSolutionPage : ContentPage
{
    public KBSolutionPage()
    {
        InitializeComponent();
 
        Grid grid = new Grid() { BackgroundColor = Color.FromHex("E4EAF0") };
        grid.RowDefinitions.Add(new RowDefinition() { Height = new GridLength(30) });
        grid.RowDefinitions.Add(new RowDefinition() { Height = new GridLength(50) });
        Label firstNumeric = new Label()
        {
            Text = "NumericTextBox",
            FontSize = 20,
            HorizontalOptions = LayoutOptions.Center,
            FontAttributes = FontAttributes.Bold,
            HorizontalTextAlignment = TextAlignment.Start,
            VerticalTextAlignment = TextAlignment.Start
        };
        SfNumericTextBox sfNumericTextBox = new SfNumericTextBox()
        {
            WidthRequest = 180,
            ParserMode = Parsers.Decimal,
            HorizontalOptions = LayoutOptions.Center,
            MaximumNumberDecimalDigits = 3,
            AllowNull = true,
            BorderColor = Color.Blue,
            TextColor = Color.Maroon,
            Value = 1000,
            Culture = new System.Globalization.CultureInfo("ja-JP"),
            FormatString = "c",
            ValueChangeMode = ValueChangeMode.OnKeyFocus,
            PercentDisplayMode = PercentDisplayMode.Value,
            FontSize = 20
        };
        grid.Children.Add(firstNumeric, 0, 0);
        grid.Children.Add(sfNumericTextBox, 0, 1);
        this.Content = grid;
    }
}
}
 

 

 

XAML Code

 

<?xml version="1.0" encoding="utf-8"?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms" 
    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
    xmlns:local="clr-namespace:KBSolution"
    xmlns:Synfusion="clr-namespace:Syncfusion.SfNumericTextBox.XForms;assembly=Syncfusion.SfNumericTextBox.XForms"
    x:Class="KBSolution.KBSolutionPage">
<ContentPage.Content>
    <Grid  BackgroundColor="#E4EAF0">
        <Grid.RowDefinitions>
            <RowDefinition Height="30"/>
            <RowDefinition Height="50"/>
        </Grid.RowDefinitions>
          <Label x:Name="firstNumeric" Text="NumericTextBox" FontSize="20" HorizontalOptions="Center"  FontAttributes="Bold" HorizontalTextAlignment="Start" VerticalTextAlignment="Start"/>
          <Synfusion:SfNumericTextBox 
            Grid.Row="1"
            WidthRequest="180" 
            ParserMode="Decimal" 
            HorizontalOptions="Center"  
            HeightRequest="40" 
            MaximumNumberDecimalDigits="3" 
            AllowNull="true" 
            BorderColor="Blue" 
            TextColor="Maroon" 
            x:Name="sfNumericTextBox"
            Value="1000" 
            FormatString="p" 
            ValueChangeMode="OnKeyFocus" 
            PercentDisplayMode="Value"
            FontSize="20" />
        </Grid >
</ContentPage.Content>
</ContentPage>
 

 

SfNumericTextBox AllowNull True

 

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