Getting started with Blazor NumericTextBox in Blazor Web App

16 Feb 20244 minutes to read

This section briefly explains about how to include Blazor NumericTextBox component in your Blazor Web App using Visual Studio.


Create a new Blazor Web App

You can create a Blazor Web App using Visual Studio 2022 via Microsoft Templates or the Syncfusion Blazor Extension.

You need to configure the corresponding Interactive render mode and Interactivity location while creating a Blazor Web Application.

Install Syncfusion Blazor Inputs and Themes NuGet in the App

To add Blazor NumericTextBox component in the app, open the NuGet package manager in Visual Studio (Tools → NuGet Package Manager → Manage NuGet Packages for Solution), search and install Syncfusion.Blazor.Inputs and Syncfusion.Blazor.Themes.

If you utilize WebAssembly or Auto render modes in the Blazor Web App need to be install Syncfusion Blazor components NuGet packages within the client project.

Alternatively, you can utilize the following package manager command to achieve the same.

Install-Package Syncfusion.Blazor.Inputs -Version 26.1.35
Install-Package Syncfusion.Blazor.Themes -Version 26.1.35


Syncfusion Blazor components are available in Refer to NuGet packages topic for available NuGet packages list with component details.

Register Syncfusion Blazor Service

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

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

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

If you select an Interactive render mode as WebAssembly or Auto, you need to register the Syncfusion Blazor service in both ~/Program.cs files of your Blazor Web App.

using Syncfusion.Blazor;

Add stylesheet and script resources

The theme stylesheet and script can be accessed from NuGet through Static Web Assets. Include the stylesheet reference in the <head> section and the script reference at the end of the <body> in the ~/Components/App.razor file as shown below:

    <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>


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 Syncfusion Blazor NumericTextBox component

Add the Syncfusion Blazor NumericTextBox component in the ~Pages/.razor file. If an interactivity location as Per page/component in the web app, define a render mode at the top of the ~Pages/.razor component, as follows:

@* desired render mode define here *@
@rendermode InteractiveAuto
<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


View Sample in GitHub.

Range validation

You can 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

Users can set the format of the NumericTextBox component using the Format property. The value will be displayed in the specified format, when the component is in focused out state.

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

Precision of numbers

You can 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