electron

Ember + Electron

I started this week knowing nothing about Ember or Electron. So, naturally, I set out to make an app using both.

Ember

Ember is an open-source JavaScript framework developed in 2011 by Yehuda Katz and Tom Dale. It follows the MVC (Model, View, Controller) pattern of development for developers designing scalable single-page web apps.

The Ember stack includes:

  • Ember CLI: Build tools and command line utility. Like Rails, all you have to do is run `ember new app-name` to generate a new app with a standard file and directory structure, a testing framework, dependencies (managed by bower and npm), ES6 syntax support using Babel and asset management for minifying. 
  • Ember Data: A data-persistence library. Ember Data can save records via a RESTful JSON API without any additional configuration.
  • Ember Inspector: An extension for Firefox and Chrome to help developers debug Ember apps.
  • Fastboot: An Ember CLI addon to allow developers the ability run their apps in Node.js.
  • Liquid Fire: Animation support.

Electron

Electron is an open-source framework for desktop GUI applications. Built by Github, Electron used to be known as Atom Shell and is the framework Atom was built with. 

Electron uses Node.js, Chromium (the magic behind Chrome), HTML, CSS and JavaScript to build cross-platform apps — Electron apps can run on Mac, Windows and Linux.

Apps built on Electron include Slack, VisualStudio, Avocode, PopKey and GitKraken.

You can think of Electron as a mini Chrome browser, controlled by JavaScript. It uses Chromium to display web pages as its GUI.

There are two main processes: Main and Renderer. Main creates the web pages by using `BrowserWindow` instances. Renderer is the tool used to display web pages. But, unlike normal browsers, Electron apps have access to native resources. When a `BrowserWindow` instance is destroyed, the renderer process is also stopped. 

 

Development Philosophy

Ember's philosophy centers around the developer. Its creators used four ideas to drive the design:

  1. Full package: Unlike most JavaScript frameworks, Ember provides the full MVC framework for ambitious client-side applications.
  2. Productivity: Ember provides tools that make getting started fast. Ember CLI provides a standard architecture with countless options for enhancement.
  3. Stability: Ember's creators and maintainers recognize the importance of backward compatibility while continuing to innovate.
  4. Flexibility: Yehuda Katz is a member of the committee responsible for creating future versions of JavaScript and made sure Ember was an early adopter of ES6.

Ember adheres to the Don't Repeat Yourself (DRY) principle and prefers convention over configuration. It is opinionated but flexible, providing developers both freedom and guidance.

Electron is best thought of by its former name: it provides a shell that wraps around your JavaScript web app to provide it lower-level access to native processes and a desktop interface. It's a fast, lightweight way to build a desktop app for any platform. 

 

Why Ember + Electron?

Well, for one, it seems like it hasn't been done a lot before. That's kinda cool and leaves lots of room to learn through experimentation. (Or pull out my hair in frustration, you know, either way.)

Initially I thought Electron would be the most heavily used because the app would be a desktop app. But again, it's really just a wrapper. 

Ember does most of the heavy lifting. 

And, I'm sure there are some people who would argue I should have opted for a native app and not used a cross-platform tool like Electron. 

While I think there's a time and place for that, right now, I'm focused on learning. And I love that I'll be able to deploy it for any system. 

 

Challenges

The greatest immediate challenge was getting started. By the end of Monday, my understanding of Ember was about 15% and my knowledge of Electron was maybe 5% — and that's probably stretching it. 

I had no idea where to start. 

So, here's what I did:

(Warning, Steve Kinney makes a lot of appearances.)

After implementing edit and create on my own program, the flow of Ember started to make more sense. Ember follows an MVC philosophy, but in a very different way than Rails. I still felt unsure of how to pass information around.  

 

The Solution

One of the features we aimed to complete was a preview of the note (written in Markdown) in HTML, shown in a separate pane. 

So how do you get the note into another component?

Here's the code for the note:

<div class="note-content pane">
  <h3>{{model.id}}</h3>
  <hr>

  <p class="note-content">{{model.content}}</p>

  {{textarea value=model.content}}

  <br>
  {{#if model.hasDirtyAttributes}}<button {{action 'saveNote' on='click'}}>Save Note</button>{{/if}}
  <button {{action 'deleteNote' on='click'}}>Delete</button>
</div>

{{markdown-renderer note=model}}

 

That last line is the key: here we're passing an object to the markdown-renderer component of our app. "Model" is what it's referred to in the note template. "Note" is what it will be referred to in markdown-renderer. 

Starting to make a little more sense?

Here's the code from markdown-renderer:

{{markdown-to-html markdown=note.content}}

{{yield}}

 

Pretty simple, huh? Almost too simple. One of my complaints about Ember is it seems like there's a lot of magic and I'm still finding it hard to parse out exactly what's happening under the hood. 

 

Next Time

I think it was overambitious of me to take on an Ember + Electron app when I'm unfamiliar with both. Next time, I'll choose one and dive deep. 

I continually struggled to figure out what docs I needed to read: Node, Ember or Electron? 

I'd like to see more apps use both technologies because I think they can work together quite well. I'm just not there yet. Maybe soon.

 

Resources

Interested in learning either Ember or Electron? Here's where to start.

 

https://assets.squarespace.com/universal/scripts-compressed/common-5fbd4cec44d42fa41cebb-min.en-US.js