Getting Started with Blazor NumericTextBox Component

27 Jan 20257 minutes to read

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

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

Prerequisites

Create a new Blazor App in Visual Studio

You can create a Blazor Server App or 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 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. Alternatively, you can utilize the following package manager command to achieve the same.

Install-Package Syncfusion.Blazor.Inputs -Version 28.2.3
Install-Package Syncfusion.Blazor.Themes -Version 28.2.3

NOTE

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

Create a new Blazor App in Visual Studio Code

You can create a Blazor Server App or Blazor WebAssembly App using Visual Studio Code via Microsoft Templates or the Syncfusion® Blazor Extension.

Alternatively, you can create a Server or WebAssembly application using the following command in the terminal(Ctrl+`).

dotnet new blazorserver -o BlazorApp
cd BlazorApp
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’re in the project root directory where your .csproj file is located.
  • Run the following command to install a Syncfusion.Blazor.Inputs and Syncfusion.Blazor.Themes NuGet package and ensure all dependencies are installed.
dotnet add package Syncfusion.Blazor.Inputs -v 28.2.3
dotnet add package Syncfusion.Blazor.Themes -v 28.2.3
dotnet restore

NOTE

Syncfusion® Blazor components are available in nuget.org. 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 Server App or Blazor WebAssembly App.

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

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.
builder.Services.AddRazorPages();
builder.Services.AddServerSideBlazor();
builder.Services.AddSyncfusionBlazor();

var app = builder.Build();
....
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. Reference the stylesheet and script in the <head> of the main page as follows:

  • For .NET 6 Blazor Server app, include it in ~/Pages/_Layout.cshtml file.

  • For .NET 7 Blazor Server app, include it in the ~/Pages/_Host.cshtml file.

  • For Blazor WebAssembly app, include it in the ~/index.html file.

<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 file.

<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

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