Getting Started with Blazor TextArea in Blazor Web App

9 Dec 20259 minutes to read

This section explains how to include the Blazor TextArea component in a Blazor Web App using Visual Studio, Visual Studio Code, and the .NET CLI.

To get started quickly with the Blazor TextArea component, watch the following video:

Prerequisites

Create a new Blazor Web App in Visual Studio

Create a Blazor Web App using Visual Studio 2022 via Microsoft Templates or the Syncfusion® Blazor Extension. For detailed instructions, refer to this Blazor Web App Getting Started documentation.

Configure the appropriate Interactive render mode and Interactivity location while creating a Blazor Web App.

Create Blazor Web App

Install Syncfusion® Blazor Inputs and Themes NuGet in the App

To add the Blazor TextArea 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.

If using the WebAssembly or Auto render modes in the Blazor Web App, install Syncfusion® Blazor component NuGet packages in the client project.

Alternatively, run the following commands in the Package Manager Console to achieve the same.

Install-Package Syncfusion.Blazor.Inputs -Version 32.1.19
Install-Package Syncfusion.Blazor.Themes -Version 32.1.19

NOTE

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

Prerequisites

Create a new Blazor Web App in Visual Studio Code

Create a Blazor Web App using Visual Studio Code via Microsoft Templates or the Syncfusion® Blazor Extension. For detailed instructions, refer to this Blazor Web App Getting Started documentation.

Configure the appropriate interactive render mode and interactivity location when setting up a Blazor Web App. For detailed information, refer to the interactive render mode documentation.

For example, to create a Blazor Web App with the Auto interactive render mode, use the following commands.

dotnet new blazor -o BlazorWebApp -int Auto
cd BlazorWebApp
cd BlazorWebApp.Client

Install Syncfusion® Blazor Inputs and Themes NuGet in the App

If using the WebAssembly or Auto render modes in the Blazor Web App, install Syncfusion® Blazor component NuGet packages in the client project.

  • 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 32.1.19
dotnet add package Syncfusion.Blazor.Themes -v 32.1.19
dotnet restore

NOTE

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

Prerequisites

Install the latest version of .NET SDK. If you previously installed the SDK, you can determine the installed version by executing the following command in a command prompt (Windows) or terminal (macOS) or command shell (Linux).

dotnet --version

Create a Blazor Web App using .NET CLI

Run the following command to create a new Blazor Web App in a command prompt (Windows) or terminal (macOS) or command shell (Linux). For detailed instructions, refer to this Blazor Web App Getting Started documentation.

Configure the appropriate interactive render mode and interactivity location when setting up a Blazor Web Application. For detailed information, refer to the interactive render mode documentation.

For example, to create a Blazor Web App with the Auto interactive render mode, use the following commands:

dotnet new blazor -o BlazorApp -int Auto
cd BlazorApp
cd BlazorApp.Client

This command creates a new Blazor Web App and places it in a new directory called BlazorApp inside your current location. See the Create a Blazor App and dotnet new CLI command topics for more details.

Install Syncfusion® Blazor Inputs and Themes NuGet in the App

Here’s an example of how to add Blazor TextArea component in the application using the following command in the command prompt (Windows) or terminal (Linux and macOS) to install a Syncfusion.Blazor.Inputs and Syncfusion.Blazor.Themes NuGet package. See Install and manage packages using the dotnet CLI topics for more details.

If using the WebAssembly or Auto render modes in the Blazor Web App, install Syncfusion® Blazor component NuGet packages in the client project.

dotnet add package Syncfusion.Blazor.Inputs --version 32.1.19
dotnet add package Syncfusion.Blazor.Themes --version 32.1.19
dotnet restore

NOTE

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

Add Import Namespaces

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

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

Register Syncfusion® Blazor Service

Register the Syncfusion® Blazor service in the ~/Program.cs file of your Blazor Web App.

If the Interactive Render Mode is set to WebAssembly or Auto, register the Syncfusion® Blazor service in the ~/Program.cs files of the main server project and associated .Client project.

...
...
using Syncfusion.Blazor;

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.
builder.Services.AddRazorComponents()
    .AddInteractiveServerComponents()
    .AddInteractiveWebAssemblyComponents();
builder.Services.AddSyncfusionBlazor();

var app = builder.Build();
....
...
using Syncfusion.Blazor;

var builder = WebAssemblyHostBuilder.CreateDefault(args);
builder.Services.AddSyncfusionBlazor();

await builder.Build().RunAsync();

Add stylesheet and script resources

Theme stylesheets and scripts are provided via 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:

<head>
    ....
    <link href="_content/Syncfusion.Blazor.Themes/bootstrap5.css" rel="stylesheet" />
</head>

<body>
    ....
    <script src="_content/Syncfusion.Blazor.Core/scripts/syncfusion-blazor.min.js" type="text/javascript"></script>
</body>

NOTE

Learn more in the Blazor themes topic, which covers Static Web Assets, CDN, and CRG. For script references, see Adding script reference.

Add Syncfusion® Blazor TextArea component

Add the Syncfusion® Blazor TextArea component to a Razor page located under the Pages folder (e.g., Pages/Home.razor) in either the Server or Client project. If an interactivity location as Per page/component in the web app, define a render mode at top of the component, as follows:

Interactivity location RenderMode Code
Per page/component Auto @rendermode InteractiveAuto
  WebAssembly @rendermode InteractiveWebAssembly
  None —

NOTE

If an Interactivity Location is set to Global and the Render Mode is set to Auto or WebAssembly, the render mode is configured in the App.razor file by default.

@* desired render mode define here *@
@rendermode InteractiveAuto
<SfTextArea Placeholder='Add your Comments'></SfTextArea>
Blazor TextArea Component

Floating label

The floating label displays the placeholder as a label above the TextArea when focused or when a value is present. Configure this behavior using the FloatLabelType property.

<SfTextArea Placeholder='Add your Comments' FloatLabelType='@FloatLabelType.Auto'></SfTextArea>
Blazor TextArea with Floating Label

See Also