Using the JavaScript Hubs Client API | SignalR Real-time Application Cookbook

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SignalR Real-time Application Cookbook

By : Roberto Vespa

4.6 (9)

SignalR Real-time Application Cookbook

4.6 (9)

By: Roberto Vespa

Overview of this book

SignalR Real-time Application Cookbook

SignalR Real-time Application Cookbook

Credits

Credits

About the Author

About the Author

Acknowledgments

Acknowledgments

About the Reviewers

About the Reviewers

www.PacktPub.com

www.PacktPub.com

Preface

Preface

Free Chapter

Understanding the Basics

Understanding the Basics

Introduction

Adding a Hub to an ASP.NET project

Adding a Hub to a self-hosting application

Connecting to a Hub from a JavaScript client

Connecting to a Hub from a .NET application

Using Hubs

Using Hubs

Introduction

Adding a method to a Hub and counting the calls to it

Calling back the caller from a Hub's method

Broadcasting to all connected clients

Adding a connection to a group

Removing a connection from a group

Broadcasting to all connected clients except the caller

Broadcasting to all clients except the specified ones

Broadcasting to all clients in a group except the caller

Broadcasting from outside a Hub

Using the return value of a Hub method

Using the JavaScript Hubs Client API

Using the JavaScript Hubs Client API

Introduction

Starting a Hub connection

Setting up connection transport strategies

Calling a server-side Hub method

Adding a client-side method on the proxy and calling it from the server

Managing errors across a complex asynchronous workflow

Using the .NET Hubs Client API

Using the .NET Hubs Client API

Introduction

Starting a Hub connection

Setting up connection transport strategies

Calling a server-side Hub method

Adding a client-side method on the proxy and calling it from the server

Managing errors across a complex asynchronous workflow

Using a Persistent Connection

Using a Persistent Connection

Introduction

Adding and registering a persistent connection

Sending messages from the server

Sending messages to the server

Exchanging messages between a server and a JavaScript client

Exchanging messages between a server and a .NET client

Handling Connections

Handling Connections

Introduction

Controlling the lifetime of a connection

Handling a connection transient state

Establishing a cross-domain connection

Analyzing Advanced Scenarios

Analyzing Advanced Scenarios

Introduction

Generating static files for JavaScript proxies

Authorizing requests on a Hub

Authorizing requests on a persistent connection

Authorizing requests in a self-hosting context

Scaling up

Scaling out with Azure

Scaling out with Redis

Scaling out with SQL Server

Establishing proxy-less connections

Introducing dependency injection (simple approach)

Introducing dependency injection (advanced approach)

Using dependency injection to replace a default behavior

Extending the Hub pipeline

Handling errors

Building Complex Applications

Building Complex Applications

Introduction

Implementing a room-based chat application

Implementing a shared whiteboard

Implementing a real-time map of flying airplanes

Implementing a "pets finder" application

Implementing a custom backplane

Implementing a real-time error notification system

Creating Web Projects

Creating Web Projects

Introduction

Creating an empty ASP.NET web application

Creating an ASP.NET web forms application

Creating an ASP.NET MVC application

Creating an MVC controller and a related view

Creating an ASP.NET website

Insights

Insights

Transport strategies

Asynchronous programming and SignalR

Index

Index

Calling a server-side Hub method

After learning how to perform a connection and customize the transport strategy, let's move to the natural next step: calling a server-side Hub method. As we have done so far in this chapter, we'll use the SignalR dynamic proxy generation feature that allows us to perform client-to-server calls in a more natural way. The alternate available approach will be illustrated in the future recipes.

This recipe and the remaining ones of this chapter have a clear goal of illustrating the client-side code in a very detailed way, and that's because we have several important features to explain. For this reason, we'll show the code and comment on it step by step, instead of going directly to its final version and commenting on it afterwards.

How to do it…

Let's proceed to the code, starting with the server side. Perform the following steps:

We first need to add a Hub, which we call EchoHub, and add the following code to it:
```
 using Microsoft.AspNet.SignalR;
 using Microsoft...
```

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