Getting Started with Blazor Speech To Text in Blazor WASM App

10 Jul 20266 minutes to read

This section briefly explains how to include the Blazor Speech To Text component in a Blazor WebAssembly App using Visual Studio, Visual Studio Code, and the .NET CLI.

Create a new Blazor WebAssembly App

Create a Blazor WebAssembly App using Visual Studio via Microsoft Templates or the Blazor Extension. For detailed instructions, refer to the Blazor WebAssembly App Getting Started documentation.

Run the following command to create a new Blazor WebAssembly App.

dotnet new blazorwasm -o BlazorApp
cd BlazorApp

Alternatively, create a Blazor WebAssembly App using Visual Studio Code via Microsoft Templates, the Blazor Extension, or the C# Dev Kit extension.

Run the following command to create a new Blazor WebAssembly App.

dotnet new blazorwasm -o BlazorApp
cd BlazorApp

Install the required Blazor packages

Install Syncfusion.Blazor.Inputs NuGet package and Syncfusion.Blazor.Themes NuGet packages using one of the following methods. All Syncfusion Blazor packages are available on nuget.org. See the NuGet packages topic for details.

  1. Go to Tools → NuGet Package Manager → Manage NuGet Packages for Solution.
  2. Search the required NuGet packages (Syncfusion.Blazor.Inputs and Syncfusion.Blazor.Themes) and install them.

Alternatively, you can install the same packages using the Package Manager Console with the following commands.

Install-Package Syncfusion.Blazor.Inputs -Version 34.1.29
Install-Package Syncfusion.Blazor.Themes -Version 34.1.29

Open the terminal and run the following commands.

dotnet add package Syncfusion.Blazor.Inputs -v 34.1.29
dotnet add package Syncfusion.Blazor.Themes -v 34.1.29

Open the command prompt and run the following commands.

dotnet add package Syncfusion.Blazor.Inputs -v 34.1.29
dotnet add package Syncfusion.Blazor.Themes -v 34.1.29

Add import namespaces

After the package is installed, open the ~/_Imports.razor file and import the Syncfusion.Blazor and Syncfusion.Blazor.Inputs namespaces.

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

Register the Blazor service

Open the Program.cs file in Blazor WebAssembly App and register the Blazor service.

....
using Syncfusion.Blazor;
....
builder.Services.AddSyncfusionBlazor();
....

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 ~wwwroot/index.html file.

...
<link href="_content/Syncfusion.Blazor.Themes/fluent2.css" rel="stylesheet" />
...
<script src="_content/Syncfusion.Blazor.Core/scripts/syncfusion-blazor.min.js" type="text/javascript"></script>

Add Blazor Speech To Text component

Open a Razor file located in the ~/Pages/*.razor (for example, Home.razor) and add the Blazor Speech To Text component inside the 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 = "";
}

Run the application

Press Ctrl+F5 (Windows) or ⌘+F5 (macOS) to launch the application. The Blazor Speech To Text component will render in your default web browser.

Open the terminal and run the following command.

dotnet run

Open the command prompt and run the following command.

dotnet run

Blazor Speech To Text Component

The Speech To Text 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 Speech To Text with Button Content Start text
Blazor Speech To Text with Button Content Stop text

See also

  1. Getting Started with Blazor Web App in Visual Studio or .NET CLI
  2. Getting Started with Blazor Server App in Visual Studio or .NET CLI