Getting Started with Blazor NumericTextBox Component

4 Nov 20256 minutes to read

This section explains how to add the Blazor Numeric TextBox component in your Blazor WebAssembly App using Visual Studio and Visual Studio Code.

To get started quickly with the Blazor Numeric TextBox, check on the following video or GitHub sample.

Prerequisites

Create a new Blazor App in Visual Studio

Create a Blazor WebAssembly App using Visual Studio via Microsoft templates or the Syncfusion® Blazor Extension.

Install Syncfusion® Blazor Inputs and Themes NuGet in the App

To add the Blazor NumericTextBox component, open the NuGet Package Manager in Visual Studio (Tools → NuGet Package Manager → Manage NuGet Packages for Solution), then search for and install Syncfusion.Blazor.Inputs and Syncfusion.Blazor.Themes. Alternatively, use the Package Manager commands shown below.

Install-Package Syncfusion.Blazor.Inputs -Version 31.2.12
Install-Package Syncfusion.Blazor.Themes -Version 31.2.12

NOTE

Syncfusion Blazor components are available on nuget.org. Refer to the NuGet packages topic for the list of available packages and component details.

Prerequisites

Create a new Blazor App in Visual Studio Code

Create a Blazor WebAssembly App using Visual Studio Code via Microsoft templates or the Syncfusion® Blazor Extension.

Alternatively, create a WebAssembly application using the following terminal commands (Ctrl+`).

dotnet new blazorwasm -o BlazorApp
cd BlazorApp

Install Syncfusion Blazor Inputs and Themes NuGet in the App

  • Press Ctrl+` to open the integrated terminal in Visual Studio Code.
  • Ensure you are in the project root directory where the .csproj file is located.
  • Run the following commands to install Syncfusion.Blazor.Inputs and Syncfusion.Blazor.Themes and restore dependencies.
dotnet add package Syncfusion.Blazor.Inputs -v 31.2.12
dotnet add package Syncfusion.Blazor.Themes -v 31.2.12
dotnet restore

NOTE

Syncfusion Blazor components are available on nuget.org. Refer to the NuGet packages topic for the list of available packages and component details.

Register Syncfusion® Blazor Service

Open ~/_Imports.razor file and import the Syncfusion.Blazor and Syncfusion.Blazor.Inputs namespaces.

@using Syncfusion.Blazor
@using Syncfusion.Blazor.Inputs

Now, register the Syncfusion® Blazor Service in the ~/Program.cs file of your Blazor WebAssembly App.

using Microsoft.AspNetCore.Components.Web;
using Microsoft.AspNetCore.Components.WebAssembly.Hosting;
using Syncfusion.Blazor;

var builder = WebAssemblyHostBuilder.CreateDefault(args);
builder.RootComponents.Add<App>("#app");
builder.RootComponents.Add<HeadOutlet>("head::after");

builder.Services.AddScoped(sp => new HttpClient { BaseAddress = new Uri(builder.HostEnvironment.BaseAddress) });

builder.Services.AddSyncfusionBlazor();
await builder.Build().RunAsync();
....

Add stylesheet and script resources

The theme stylesheet and script can be accessed from NuGet through Static Web Assets. Include the stylesheet and script references in the <head> section of the ~/index.html.

<head>
    ....
    <link href="_content/Syncfusion.Blazor.Themes/bootstrap5.css" rel="stylesheet" />
    <script src="_content/Syncfusion.Blazor.Core/scripts/syncfusion-blazor.min.js" type="text/javascript"></script>
</head>

NOTE

Check out the Blazor Themes topic to discover various methods (Static Web Assets, CDN, and CRG) for referencing themes in your Blazor application. Also, check out the Adding Script Reference topic to learn different approaches for adding script references in your Blazor application.

Add Blazor NumericTextBox component

Add the Syncfusion® Blazor NumericTextBox component in the ~/Pages/Index.razor.

<SfNumericTextBox TValue="int?" Value=10></SfNumericTextBox>
  • Press Ctrl+F5 (Windows) or ⌘+F5 (macOS) to launch the application. This will render the Syncfusion® Blazor NumericTextBox component in your default web browser.
Blazor NumericTextBox Component

Range validation

Set the minimum and maximum range of values in the NumericTextBox using the Min and Max properties, so the numeric value should be in the min and max range.

<SfNumericTextBox TValue="int?" Value=5 Max=100 Min=1 Step=5></SfNumericTextBox>
Inputnumber Blazor with Range Value

Formatting the value

Set the display format of the NumericTextBox component using the Format property. The value is displayed in the specified format when the component is not focused.

<SfNumericTextBox TValue="int?" Value=10 Format="c2"></SfNumericTextBox>
Blazor NumericTextBox with Formatting Value

Precision of numbers

Restrict the number of decimals to be entered in the NumericTextBox by using the Decimals and ValidateDecimalOnType properties. So, you cannot enter the number whose precision is greater than the mentioned decimals.

If ValidateDecimalOnType is false, number of decimals will not be restricted. Else, number of decimals will be restricted while typing in the NumericTextBox.

<SfNumericTextBox TValue="double?" Value=10 ValidateDecimalOnType=true Decimals=3 Format="n3" Placeholder="ValidateDecimalOnType enabled" FloatLabelType="@FloatLabelType.Auto"></SfNumericTextBox>

<SfNumericTextBox TValue="double?" Value=10 Decimals=3 Format="n3" Placeholder="ValidateDecimalOnType disabled" FloatLabelType="@FloatLabelType.Auto"></SfNumericTextBox>
Blazor NumericTextBox with Precision Value

See also