Getting Started with Blazor SpeechToText in a Blazor WASM App

26 Sep 20256 minutes to read

This section explains how to add the Blazor SpeechToText component to a Blazor WebAssembly application using either Visual Studio or Visual Studio Code.

Prerequisites

Create a new Blazor App in Visual Studio

Create a Blazor WebAssembly App in Visual Studio by using either the standard Microsoft Templates or the Syncfusion® Blazor Extension.

Install Syncfusion® Blazor Inputs NuGet in the App

To add the Blazor SpeechToText component to the app, open the NuGet package manager in Visual Studio (Tools → NuGet Package Manager → Manage NuGet Packages for Solution), search for and install Syncfusion.Blazor.Inputs. Alternatively, use the following package manager command to install it.

To add Blazor SpeechToText to the application, open the NuGet Package Manager in Visual Studio (Tools → NuGet Package Manager → Manage NuGet Packages for Solution), search for and install Syncfusion.Blazor.Inputs. Alternatively, the package can be installed using the following Package Manager Console command.

Install-Package Syncfusion.Blazor.Inputs -Version 31.2.12

NOTE

Syncfusion® Blazor components are available in nuget.org. Refer to NuGet packages topic for available NuGet packages list with 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, the application can be created by executing the following command in the terminal(Ctrl+)`.

dotnet new blazorwasm -o BlazorApp
cd BlazorApp

Install Syncfusion® Blazor Inputs 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 NuGet package and ensure all dependencies are installed.
dotnet add package Syncfusion.Blazor.Inputs -v 31.2.12
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 the ~/_Imports.razor file and add the Syncfusion.Blazor namespace.

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

Next, register the Syncfusion Blazor Service in the ~/Program.cs file. This enables the use of Syncfusion components in the application.

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();
....

Script and Style reference

  • Ensure that CSS stylesheets are referenced inside the tag.
  • Ensure that JavaScript files or script references are placed end of the tag.

  • If any markdown content or code snippet violates this structure, update it accordingly.

  • For a Blazor WebAssembly app, modify the ~/wwwroot/index.html file.
<head>
    ....
    <script src="_content/Syncfusion.Blazor.Core/scripts/syncfusion-blazor.min.js" type="text/javascript"></script>
</head>

NOTE

To learn about other ways to add script references, see the Adding Script Reference topic.

Add Blazor SpeechToText component

Add the Syncfusion® Blazor SpeechToText component to the ~/Pages/Index.razor file.

@using Syncfusion.Blazor.Inputs

<div class="speechtext-container">
    <SfSpeechToText @bind-Transcript="@transcript"></SfSpeechToText>
    <SfTextArea RowCount="5" ColumnCount="50" @bind-Value="@transcript" ResizeMode="Resize.None" Placeholder="Transcribed text will be shown here..."></SfTextArea>
</div>

<style>
    .speechtext-container {
        margin: 50px auto;
        gap: 20px;
        display: flex;
        flex-direction: column;
        align-items: center;
    }
</style>

@code {
    string transcript = "";
}
  • Press Ctrl+F5 (Windows) or ⌘+F5 (macOS) to launch the application. The Syncfusion® Blazor SpeechToText component will be rendered in your default web browser.

Blazor SpeechToText Component

The SpeechToText component requires an internet connection and a browser that supports the SpeechRecognition Web Speech API.

Add button content

Use the Text property to display the start listening text and StopStateText property to display the stop listening text by using the ButtonSettings property.

@using Syncfusion.Blazor.Inputs

<div class="speechtext-container">
    <SfSpeechToText ButtonSettings="@buttonSettings" @bind-Transcript="@transcript"></SfSpeechToText>
    <SfTextArea RowCount="5" ColumnCount="50" @bind-Value="@transcript" ResizeMode="Resize.None" Placeholder="Transcribed text will be shown here..."></SfTextArea>
</div>

<style>
    .speechtext-container {
        margin: 50px auto;
        gap: 20px;
        display: flex;
        flex-direction: column;
        align-items: center;
    }
</style>

@code {
    string transcript = "";
    SpeechToTextButtonSettings buttonSettings = new SpeechToTextButtonSettings()
    {
        Text = "Start Listening", // Displays when idle
        StopStateText = "Stop Listening" // Displays when speech recognition is active
    };
}

Blazor SpeechToText with Button Content Start text
Blazor SpeechToText with Button Content Stop text

See Also