The road to Ember.js 2.0

The road to EmberJs 2.0
Lucio Grenzi
ROME 18-19 MARCH 2016

Who is this guy
Freelance
Front end web developer
Over 10 years of programming
experience
Open source addicted
Github.com/dogwolf

“A framework for creating ambitous web application”
- Emberjs homepage -
Latest version: v 2.4
Date of birth: 2011
Origin: SproutCore fork
MIT License
Mantained by the Ember.Js Community
Depends on handlebar.js and jQuery
More than 15000 GitHub stars

What is Ember.js?
 A Javascript framework
 Based on MVC pattern
 Client side
 Single Page App
 Declarative
 Two ways data binding*

AngularJs vs EmberJs
AngularJS is a toolset for building the framework most
suited to your application development
- AngularJs homepage-
A framework for creating ambitous web application”
- Emberjs homepage -

Philosophy on AngularJs
Web application development needs first class support for
data binding, dependency injection and testability
Use this primitives to build your own high level
abstractions specific to your particular application's needs

Quality of a framework
1. It should be clear where code belongs and where to
find it
2. You should have to write and mantain the least code
amount of code necessary
3. Change in one area of your app should not affect
others areas

EmberJs Philosophy
 Stability without stagnation
 Big bang releases
 App rewrites (every new release)
 Long-lived (custom) branches

EmberJs release cycle
Six weeks release cycle
Add new features
Deprecates nasty parts of the code
Ember 2.0 only removes features that were deprecated as
of Ember 1.13

What’s new in EmberJs 2.0
• Ember CLI
• Shift to Components
• Glimmer, the new rendering engine
• ES6 modules at the core
• One-way values by default
• Simplification of many Ember concepts:
– New attribute binding syntax
– HTML syntax (angle brackets) for Components
– More consistent scoping
– much more…

Ember-cli

Ember-cli support
Handlebars
HTMLBars
Emblem
LESS
Sass
Compass
Stylus
CoffeeScript
EmberScript
Minified JS & CSS

Ember-cli (cont.)
Require Node.js and npm
Require Bower in order to keep your front-end dependencies
up-to-date
$npm install -g bower
Reccomended PhantomJs in order to use the automated test
runner
$npm install -g phantomjs-prebuilt

Create a new project
$ember new my-app
Launch a project
$cd my-app
$ember server
Navigate to http://localhost:4200 to see the new app

Other usefull commands
$ember build
Builds the application into the dist/ directory
$ember test
Run tests with Testem in CI mode.
$ember install <addon-name>
Installs addon-name into your project and saves it to the
package.json file

Ember-cli addon system
Provides a way to create reusable units of code
Extend the build tool
Found all the addons at emberaddons.com

Emberaddons

Handlebars 2.x
A superset of the Mustache template engine
First added to EmberJ 1.9
The focus is keeping the logic out of the template

<body>
<script type="text/x-handlebars" id="ember-template" data-template-
name="index">
</b>My videos</b><ul>
{{#each video in videos}}
<li>{{#link-to 'videos.edit' video}}{{video.title}}{{/link-to}}</li>
{{/each}}
</ul></script>
</body>

Glimmer
The render engine, since version 1.13
Takes advantage of the groundwork laid by HTMLBars to
dramatically improve re-rendering performance.
Compatible with the full public API of Ember 1.x

Glimmer (cont.)
Takes advantage of the React-inspired improvements to
the Ember programming model

 Value-diffing strategy by using a virtual tree of the
dynamic areas of the DOM
 Supporting efficient re-renders of entire data structures.
 Explicit mutation (via set) when it is used


One-Way Bindings
On Ember 1.x component properties used to be bound
two ways.
Property of a component as well as its data source are
both mutable.
{{#my-component compName=model.name }}{{/my-
component}}
<my-component compName=model.name ></my-
component>

Explicitly a two-way binding
There is a new mut keyword to explicit the old behaviour
<my-component compName={{mut model.name}} ></my-
component>

Manage a mutable component
Set the value of the property
this.attrs.compName.update("newcompName");
Show the actual value of the property
this.attrs.firstName.value;

Ember-data
Library for robustly managing model data in your Ember.js
applications
Is designed to be agnostic to the underlying persistence
mechanism
Uses Promises/A+-compatible promises to manage
loading and saving records

Getting started with Ember-data
Version >= 2.3 ember-data is a proper Ember-CLI
$ember install ember-data
Version < 2.3, add the npm package and add the
dependency via bower:
npm install ember-data@v2.2.2 --save-dev
bower install ember-data --save

Ember-data flow
Application
Store
Adapter
Cloud
Promise (with records)
Promise (json)
find()
find()
XHR() XHR() returns

The Store
The store is responsible for managing the lifecycle of your
models.
By loading the Ember Data library in your app, all of the
routes and controllers in will get a new store property

The Adapter
The adapter is responsible for translating requests from
Ember-data into requests on your server.

How it woks
// app/models/news.js
import DS from 'ember-data';
export default DS.Model.extend({
title: DS.attr('string'),
createdBy: DS.attr('string'),
createdAt: DS.attr('date'),
comments: DS.hasMany('comment')
});
// app/models/comment.js
import DS from 'ember-data';
export default DS.Model.extend({
message: DS.attr('string'),
sentAt: DS.attr('date'),
nickname: DS.attr('string'),
post: DS.belongsTo('news')
});
Retrieve multiple records
var newses = this.store.findAll('news'); // => GET /posts
var newses = this.store.peekAll('news'); // => no network request
Query for multiple records
this.store.query('news', { filter: { createdBy:'Lucio' }
}).then(function(param_1) {
});

More intuitive attribute bindings
Ember 1.x (deprecated)
<a {{bind-attr href=url}}>Click here</a>
Ember 2.x
<a href="{{url}}">Click here</a>

Components
Based on of the W3C Web Components specification
The specification is comprised of four smaller
specifications; templates, decorators, shadow DOM,
and custom elements.

Ember Components vs. Ember Views
 EmberJs is a MVC .. V doesn't stand for view?

 Components are a subclass of Ember.View

 Views are generally found in the context of a controller.

 Views sit behind a template and turn input into a semantic
action in a controller or route.

Ember Components vs. Ember Views
 EmberJs component do not have a context, they only
know about the interface that they define
 Components can be rendered into any context, making it
decoupled and reusable.
 In order to render properly a component you must supply
it with data that it's expecting

Anatomy of an Ember Components
An Ember component consists of a Handlebars template
file and an accompanying Ember class (if needed extra
interactivity with the component).

Generate an Ember Component
$ ember generate component multitabs
This will create three new files
 a Handlebars file for our HTML
 app/templates/components/multitabs.hbs
 a JavaScript file for our component class
app/components/multitabs.js
 a test file
tests/integration/components/multitabs-test.js

Using the Component
Open the application template
app/templates/application.hbs
Add in the following after the h3 tag to use the component.
{{multitabs}}

Add dynamic data
$ ember generate route application
This will generate app/routes/application.js.
Open this up and add a model property:
export default Ember.Route.extend({
model: function(){
});
});

Add Polymer to Ember project
$ ember new PolymerProject
$ bower install polymer --save

// Brocfile.js
...
var EmberApp = require('ember-cli/lib/broccoli/ember-app');
...
var app = new EmberApp();
...
var polymer = pickFiles('bower_components/', {
srcDir: '',
files: [
'webcomponentsjs/webcomponents.js',
'polymer/polymer.html'
// 'polymer/polymer.js'
],
destDir: '/assets'
});
module.exports = mergeTrees([ polymer, app.toTree()]);
// Index.html
...
<script src="assets/webcomponentsjs/webcomponents.js"></script>
...

Resources and References
https://github.com/emberjs/data
https://github.com/emberjs/rfcs/pull/15
http://ember-cli.com/
http://code.tutsplus.com/tutorials/ember-components-a-
deep-dive--net-35551
http://www.sitepoint.com/understanding-components-in-
ember-2/

Questions?
https://www.flickr.com/photos/derek_b/3046770021/

Thanks!
ROME 18-19 MARCH 2016
l.grenzi@gmail.com
Dogwolf
lucio.grenzi
All pictures belong
to their respective authors

The road to Ember.js 2.0

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