Toolbelt.Blazor.SpeechRecognition 0.0.4.6-alpha

Blazor Speech Recognition

Summary

This is a class library for Blazor app to provide Speech Recognition API access.

Requirements

Blazor v.3.1.0 Preview 4, 3.2, 5.0 or later.

Both "Blazor WebAssembly App" (a.k.a."Client-side Blazor") and "Blazor Server App" (a.k.a."Server-side Blazor") are supoorted.

How to install and use?

1. Installation and Registration

Step.1-1 Install the library via NuGet package, like this.

> dotnet add package Toolbelt.Blazor.SpeechRecognition --version 0.0.4.6-alpha

Step.1-2 Register "SpeechRecognition" service into the DI container.

If the project is a Blazor Server App or a Blazor WebAssembly App ver.3.1 Preview 4 or earlyer, add the code into the ConfigureService method in the Startup class of your Blazor application.

// Startup.cs

using Toolbelt.Blazor.Extensions.DependencyInjection; // <- Add this, and...
...
public class Startup
{
  public void ConfigureServices(IServiceCollection services)
  {
    services.AddSpeechRecognition(); // <- Add this line.
    ...

If the project is a Blazor WebAssembly App ver.3.2 Preview 1 or later, add the code into the Main method in the Program class of your Blazor application.

// Program.cs

using Toolbelt.Blazor.Extensions.DependencyInjection; // <- Add this, and...
...
public class Program
{
  public static async Task Main(string[] args)
  {
    var builder = WebAssemblyHostBuilder.CreateDefault(args);
    ...
    builder.Services.AddSpeechRecognition(); // <- Add this line.
    ...

2. Usage in your Blazor component (.razor)

Step.2-1 Open the Toolbelt.Blazor.SpeechRecognition namespace, and inject the SpeechRecognition service into the component.

@{/* This is your component .razor */}
@using Toolbelt.Blazor.SpeechRecognition @{/* Add these two lines. */}
@inject SpeechRecognition SpeechRecognition
...

Step.2-2 Subscribe Result event of the SpeechRecognition service to receive the results of speech recognition.

protected override void OnInitialized()
{
  this.SpeechRecognition.Result += OnSpeechRecognized;
}

void OnSpeechRecognized(object sender, SpeechRecognitionEventArgs args)
{
  // DO SOMETHING...
}

Step.2-3 Invoke StartAsync() method of the SpeechRecognition service when you want to start speech recognition.

async Task OnClickStart()
{
  await this.SpeechRecognition.StartAsync();
}

Step.2-4 Implement IDisposable interface on the component, and unsubscribe Result event when the component is disposing.

...
@implements IDisposable
...
@code {
  ...
  public void Dispose()
  {
    this.SpeechRecognition.Result -= OnSpeechRecognized;
  }
}

See also sample code on the GitHub repository.

Configuration

The calling of services.AddSpeechRecognition() injects the references of JavaScript file (.js) - which is bundled with this package - into your page automatically.

If you don't want this behavior, you can disable these automatic injection, please call services.AddSpeechRecognition() with configuration action like this:

services.AddSpeechRecognition(options =>
{
  // If you don't want automatic injection of js file, add bellow;
  options.DisableClientScriptAutoInjection = true;
});

You can inject the helper JavaScript file manually. The URLs is bellow:

• _content/Toolbelt.Blazor.SpeechRecognition/script.min.js

Release Note

• v.0.0.4-alpha
  • Upgrade Blazor to v.3.1.0 Preview 4.
  • Add support for Blazor Server App (Server-side Blazor).
• v.0.0.3-alpha - Upgrade Blazor to v.3.0.0 Preview 9.
• v.0.0.2-alpha - Upgrade Blazor to v.3.0.0 Preview 6.
• v.0.0.1-alpha - 1st release.

License

Mozilla Public License Version 2.0