Dynamic Interaction between the Client and Server Application | Node Web Development - Second Edition

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Node Web Development - Second Edition - Second Edition

By : David Herron

4 (1)

Node Web Development - Second Edition

4 (1)

By: David Herron

Overview of this book

Presented in a simple, step-by-step format, this book is an introduction to web development with Node.This book is for anybody looking for an alternative to the P languages (Perl, PHP, Python), or anyone looking for a new paradigm of server-side application development.The reader should have at least a rudimentary understanding of JavaScript and web application development.

Node Web Development Second Edition

Node Web Development Second Edition

Credits

Credits

About the Author

About the Author

Acknowledgement

Acknowledgement

About the Reviewers

About the Reviewers

www.PacktPub.com

www.PacktPub.com

Preface

Preface

Free Chapter

About Node

About Node

The capabilities of Node

Why should you use Node?

What's in a name – Node, Node.js, or Node.JS?

Summary

Setting up Node

Setting up Node

System requirements

Installing Node using package managers

Installing the StrongLoop Node distribution

Installing from source on POSIX-like systems

Installing developer tools on Mac OS X

Run a few commands; testing the commands

npm – the Node package manager

Starting Node servers at system startup

Summary

Node Modules

Node Modules

Defining a module

Node package manager

Summary

HTTP Servers and Clients – A Web Application's First Steps

HTTP Servers and Clients – A Web Application's First Steps

Sending and receiving events with EventEmitters

HTTP server applications

HTTP Sniffer – listening to the HTTP conversation

Web application frameworks

Getting started with Express

Calculating the Fibonacci sequence with Express

Making HTTP Client requests

Calling a REST backend service from an Express application

Summary

Implementing a Simple Express Application

Implementing a Simple Express Application

Express and the MVC paradigm

Creating the Notes application code

Changing the look of an Express application

Scaling up and running multiple instances

Summary

Data Storage and Retrieval

Data Storage and Retrieval

Asynchronizing the Notes application

Storing notes in files

Storing notes with the LevelUP data store

Storing notes in SQL – SQLite3

Storing notes the ORM way with the Sequelize module

Storing notes in MongoDB with Mongoose

Summary

Multiuser Authorization, Deployment, Scaling, and Hosting

Multiuser Authorization, Deployment, Scaling, and Hosting

User authentication

Deploying Notes on Debian

Scaling to use all cores on multi-core servers

Deploying Notes on cloud hosting (AppFog)

Summary

Dynamic Interaction between the Client and Server Application

Dynamic Interaction between the Client and Server Application

Adding real-time web features to Notes

Introducing Socket.IO

Initializing Socket.IO with Express

Events between the Notes server and client code

Running the Notes application with Socket.IO

Sending messages between users

Summary

Unit Testing

Unit Testing

Testing asynchronous code

Assert – the simplest testing methodology

Testing a model

Testing router functions

Making it easy to run the tests

Summary

Index

Index

Summary

We've covered a lot of territory in this chapter, gaining an understanding of how to use Socket.IO to implement real-time communications between multiple clients connected to the same web application. With this we can now write applications that dynamically send events and data back and forth between the client and the server.

The Socket.IO library can be used to implement any kind of dynamic interaction between client and server. The server can be used as an intermediary for sending messages between users of an application or other peer-server-peer communications.

Specifically, we went over these things:

Implementing the real-time web by holding the server-client connection open
The Comet style protocols
The Socket.IO library
Using EventEmitters to send events within the server
Writing JavaScript code in the browser
Integrating data from the server into JavaScript on the browser
Sending messages between the server and client using Socket.IO

In the next chapter, we'll be wrapping this book...

CONTINUE READING

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Tech Concepts

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Programming languages

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