Getting Started with EWDjs

Learn how to install, configure and begin developing applications with EWDjs
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Instructed by Rob Tweed IT & Software / Other
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  • Lectures 23
  • Length 3 hours
  • Skill Level Beginner Level
  • Languages English
  • Includes Lifetime access
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    Available on iOS and Android
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About This Course

Published 5/2015 English

Course Description

This is an introductory course on the EWDjs framework.

The course assumes little, if any, prior technical knowledge, but it helps if you're familiar with Windows, Nodejs, HTML, JavaScript and the use of databases.

The course is mainly based around screen-casts that take the student, step-by-step, through the entire process of

  • installing the components needed for EWDjs
  • developing a browser-based application
  • developing a set of Web Services

However it also includes some animated presentations that aim to help the student to understand the technology and architecture of EWDjs

All the source code used in the examples I create in the screencasts is included in the downloadable resources for each lecture.

With just over 3 hours of lectures, the course is designed to be completed in a day if you can dedicate the time to it, but I'd recommend that some of the lectures are watched several times in order to fully understand what's going on.

This course will be of interest to anyone who wants to develop interactive, browser-based applications and Web Services with Nodejs, and particularly if you're interested in using Nodejs with the Cache database technology or the GT.M database. If you're a Mumps developer looking to update your skills and modernise your technology stack, particularly if you're working with the VistA Electronic Healthcare Record (EHR), then this course will be particularly relevant.

What are the requirements?

  • Very little prior knowledge is assumed for this course
  • The course just assumes that you are already running a recent version of Windows

What am I going to get from this course?

  • install all the components needed by EWD.js on a Windows system
  • understand the technology behind and architecture of EWD.js
  • develop browser-based applications using EWD.js
  • develop Web Services using EWD.js

Who is the target audience?

  • This course is meant for anyone wishing to learn the basics of EWD.js in order to develop Node.js applications
  • This course is also a must for anyone wishing to use EWD.js to modernise the VistA Electronic Health Record (EHR)
  • This is a beginners course and therefore not suitable for anyone already familiar with using EWD.js

What you get with this course?

Not for you? No problem.
30 day money back guarantee.

Forever yours.
Lifetime access.

Learn on the go.
Desktop, iOS and Android.

Get rewarded.
Certificate of completion.


Section 1: Introduction and Overview
Choose your platform
Section 2: Getting Started with EWD.js on Windows

In this lecture, we'll install the Chrome browser and Notepad++ in preparation for EWDjs. Chrome is not essential, but strongly recommended. Other editors than Notepad++ can be used, but it's a useful and free tool for EWDjs application development, at least to get started with.


In this lecture, we'll install Node.js. You should install whatever is the latest 0.10.x version available when you watch this video - 0.10.38 was the latest version when this screen-cast was recorded.

We'll also quickly test it using the Windows Console which we'll pin to the task-bar to make future use of Node.js easier.


In this lecture, we'll install the Cache database on our Windows system, and take you on a quick guided tour of the information you'll need in order to configure it for use with EWDjs


In this lecture, we'll install the free GlobalsDB database which is a good alternative to Cache since it's both free and, in fact, the core database engine from Cache! It does have limitations: there's no ability to scale it out or even any real built-in system management facilities, but it's an ideal platform if you want to learn EWDjs and build some initial applications.


With everything ready on our Windows system, we can now install EWDjs


With everything now installed, EWDjs can be configured for use with GlobalsDB and started. This lecture also shows you how to stop/restart EWDjs, and how to start the ewdMonitor application in a browser in order to confirm that EWDjs is fully operational.


With everything now installed, EWDjs can now be configured for use with the Cache database and started. This lecture also shows you how to stop/restart EWDjs and how to start the ewdMonitor application in a browser in order to confirm that EWDjs is fully operational.


So far we've been running EWDjs in a Command Prompt window which if fine for development and testing environments, but not ideal for production. In this screencast I'll show you how to use the NSSM utility to create an EWDjs service that will run automatically in the background. I'll also show you how to pipe the console logging information to a log file that can be inspected using the browser-based ewdMonitor application.

Section 3: Starting EWD.js Application Development

In this lecture, I'll describe, using an animated presentation, the EWDjs architecture and explain how it works.


In this lecture, we'll start to develop a simple "hello world" EWDjs application


In this lecture, we'll send a message from the browser to the EWDjs back-end


In this lecture, we add a back-end module to handle the message sent from the browser


In this lecture, we modify the browser's UI in response to the incoming message from the EWDjs back-end


In this lecture, we construct a more complex message and round-trip its contents between browser and back-end


In this lecture, we save a browser-generated JSON message into the database and retrieve it again as JSON


In this lecture we review what happened in the previous lecture, introduce EWDjs Session Storage, and examine how it works


In this lecture, we save the browser-generated JSON message into Session storage and retrieve it again

Section 4: Introduction to EWD.js Web Services

In this lecture we'll create a couple of simple Web Services to save information into the database and retrieve it again


In this lecture we explain the built-in authentication mechanism and run our previous service with authentication enabled

Section 5: Conclusions

In this lecture, I'll summarise the main resources that you'll find useful when you develop with EWDjs

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Instructor Biography

Rob Tweed, Author of EWD.js

My name is Rob Tweed. I'm a Director and co-founder of M/Gateway Developments Ltd, a UK company that, since 1996, has specialised in web and internet technologies, in particular in conjunction with the Caché and GT.M databases.

I'm the author of EWDjs, a Node.js-based framework for browser-based client/server applications. EWDjs is specifically designed for use with the Caché and GT.M technologies, but supports other NoSQL databases including MongoDB and can be used as a framework with any other database technology.

My IT career started at the Royal Marsden Hospital, the UK's premier cancer hospital based in London and Surrey, where I headed up the application development team within their Computer Department.

I spent 4 years working in the Healthcare IT team at Touche Ross Management Consultants in London, during which time (and for several years after) I was a key member of the NHS-Wide Networking Project team, one of Europe's largest-ever networking projects, managed by the NHS Management Executive.

After becoming an independent consultant in the mid-1990s, I have focused exclusively on web technologies, with a particular focus on their role in healthcare. I was the inspiration behindWebLink, a web gateway product that I and my fellow co-director Chris Munt created and sold toInterSystems, the vendor of Caché. I also developed InterSystems' WebLink Developer framework, the pre-cursor to EWDjs, and have consulted with and supported many of InterSystems' major customers around the world to help them build their web application projects. The largest of these customers is Quest Diagnostics in the USA who use both WebLink Developer and EWD (the immediate predecessor to EWDjs) to support their Care360 application: the world's largest Caché-based, internet-facing web application. I provide support to Quest Diagnostics for both EWD and WebLink Developer.

Recent high-profile work includes my technical support and development of the JavaScript User Interface for Oroville Hospital's winning entry in 2013 to the US Dept of Veteran's Affairs Scheduling competition.

My technical expertise includes over 30 years' experience in the Mumps, Caché and GT.M technologies in not only healthcare but also a wide range of market sectors including financial services, online publishing and retail. Other experience includes:

  • Nodejs
  • Javascript
  • JSON
  • Javascript frameworks including Bootstrap, jQuery, ExtJS and Sencha Touch
  • NoSQL databases
  • WebSockets
  • XML
  • Mobile web applications and frameworks

I have presented at a wide range of conferences in the USA, UK and elsewhere, including Ajax World, Cloud Computing, EHI Live, London Node.js Users Group and InterSystems' Developers Conference.

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