90-minute October 2015 Los Angeles CTO Forum presentation on AngularJS, other JavaScript frameworks including ReactJS, and the state of web development in 2015. Topics covered: - State of web development in 2015 - AngularJS code examples - Analysis of JavaScript MVC frameworks suitable for 2015-2019 development - AngularJS pros/cons - ReactJS - Hybrid mobile apps

1. A presentation on AngularJS and the state of web development in 2015

2. Topics
Please ask questions!
1. Who am I and what is Enplug?
2. Web development in 2015
3. AngularJS examples
4. JS frameworks
a. Considerations
b. Options
c. AngularJS
d. Angular 2.0 (upcoming)
5. React by Facebook
6. Hybrid mobile apps
7. Resources

3. Who am I and what
is Enplug?

4. Alex Ross
Full-stack web developer &
mobile developer
● JavaScript
● HTML 4-5
● CSS 2, 3, and SASS
● The Internet: DNS, HTTP, sockets,
CDNs, LB, etc
● PHP & ZendFramework
● Apache
● MongoDB
● MySQL
● Objective-C (OSX & iOS)
● RabbitMQ
● Android & Java
● Ruby (some Rails)
● Python
● PhoneGap / Apache Cordova

5. Enplug
Los Angeles-based tech
company
● Founded in 2012
● $5M in seed funding
● 20 employees
● B2B SaaS software
● 500+ customers
● Doing for digital displays what
Wordpress did for websites, or Shopify
did for e-commerce

6. DisplayOS
Display software for teams and
businesses

7. ● C# app servers
● Event-driven architecture using
RabbitMQ. Migrating to Amazon SQS
● MongoDB & SQLServer
● JSON endpoints & sockets
● Hardware: thousands of Android-based
client devices running Java & JS-based
apps
● Web, iOS and Android management
apps
● 3rd party development SDK: developers.
enplug.com
DisplayOS
Display software for teams and
businesses

8. DisplayOS dashboard (latest AngularJS in production)

9. Web development in
2015

10. ● Browser inconsistencies less of a serious issue for n-1 browsers
● JavaScript rapidly maturing (ES2015)
● HTML5 works well
● CSS3 works great
● Tools: maturing package managers, build automation, etc.
● Client-side data storage: IndexedDB for significant amounts of
structured data, localstorage for simple key-value.
● Multi-threading: web workers (but still haven’t seen a good core use)
● Impressive improvements forthcoming: web components, class-based
inheritance, modules, and much more.
Things are looking up

11. HTML5 & CSS3 support

13. Building apps for the
web

14. Static pages
Server generated
pages
JavaScript DOM
manipulation
(imperative)
Fastest initial page load. But, must re-render
entire page to reflect changes in data.
Programmer manually updates specific parts
of the page without entire re-render when data
changes. Much smoother.
JavaScript data
binding
(declarative)
Same as above, except the framework
observes data and does the DOM
manipulation when data changes. Less work
for the programmer.

15. Building apps with
AngularJS

16. AngularJS is a JavaScript framework sponsored by Google that takes much of what was once done
exclusively on servers, and puts it in the front-end. It is 100% JavaScript, 100% client-side.
Concepts: Routing, templating, dependency injection, code architecture (factories, singletons, scopes,
MVVM) and more.
Why do some people put so much in the front-end? Speed and separation of concerns. It’s faster to
update a part of a page than an entire page, and some people believe the client/browser should handle all
UI while the server provides APIs for the browser, mobile devices and other clients.
Why so much in the front-end?

17. Patterns of organizing software into separate responsibilities in order facilitate faster and
more stable development, also making it easier to maintain projects over time.
MVC: Model-View Controller
MVVM: Model-View View-Model
The simple difference: the view model is used to two-way bind data from the model
(server) to the view (browser) using JavaScript. In practice, MVVM still usually has
controllers to control overall logic.
Design patterns: MVC and MVVM

18. Hello World
● ng-app
● Angular source (50 KB gzipped)
● ng-model
● data binding {{ }}

19. App definition
app.js
● Declare dependencies
● Lifecycle hooks
○ .config()
○ .run()

20. Example app
1. ng-app
2. ng-controller
3. ng-bind
4. ng-view
5. ng-hide
6. ng-include
7. ng-if
8. <fab>

21. Routing
● Routing lifecycle hooks
○ $routeChangeStart
○ $routeChangeSuccess
○ $routeChangeError
● Arbitrary data allowed in
route config, useful for ACLs or
other route-based logic

22. User interfaces: controllers and templates
AddUserController.jsadd-user.html

23. The model: services
● Services are dependency-injected into
controllers and contain the app logic.
● Services hold the model. They read data
and persist changes.
● Controllers should be as thin as possible
(zero logic), only bring logic together.
● Controllers trigger model <=> view
updates.

24. Loading data (1): controller “init”

25. Loading data (2): resolves
● resolves
● DI

26. Angular services
● $http
● $log
● $cookies
● $exceptionHandler
● $interval
● $timeout
● $route
● $rootScope
● $sanitize
● $animate
● $templateCache
● $locale
● $location
● $q
● $httpParamSerializer
● … and more

27. Form data & validation
● ng-submit
● ng-model
● form.$submitted
● form.$touched
● form.$error
● form.$invalid

28. Directives example: tooltip
tooltip.js (simplified)
Using the directive:
Result (including tooltip.html and tooltip.css)

29. Directive example: location-aware
location-aware.js
Marking current location as active
for better UX: very common app-
wide requirement.
● element
● attributes
● event system
JS functionality invoked on
element by directive location-
aware.

30. Directive example: color picker (jQuery plugin)
Result:

31. Angular built-in directives
● ng-repeat
● ng-class
● ng-hide/ng-show
● ng-if
● ng-form
● ng-include
● ng-href
● ng-src
● ng-repeat
● ng-list
● ng-pluralize
● ng-style
● ng-switch
● … and more

32. Directive example: ng-repeat
Controller + HTML template
Renders as:

33. Filters example
Controller + HTML template
Renders as:

34. Project structure
● Small projects: code organized by file type
○ controllers, templates, services, etc.
● Bigger projects: code organized by module, then file
type. Requires build automation.
● Distribution: concat, minify, obfuscate, etc:

35. JS frameworks
Is a front-end framework (and AngularJS) right for
your team? Perhaps

36. Q: Should my front-end app leverage data binding and reusable components?
A: New projects: yes. Existing projects: eventually yes.
Q: Should I use a framework for this?
A: Yes, unless you’re committed to reinventing many common components of an SPA
Q: Which framework should I use if I don’t already have one?
A: As of October 2015, AngularJS, EmberJS or BackboneJS
Boiling it down: questions to start with

37. Single page apps (SPA) need proper code architecture (count the UI components)

38. 1. To reduce boilerplate: let framework subroutines handle the nitty-gritty like routing, form validation,
data binding, dependency injection, XHR requests, etc.
2. To leverage common knowledge: use existing patterns and best practices
3. To reduce ramp-up: a strong ecosystem of documentation, tutorials, blog posts, and training
programs (e.g. Lynda) means you need to document and explain less of your app to new
developers.
Big-picture reasons to use a framework
Takeaway: frameworks can help manage complexity

39. 1. Data binding and reusable components are good ideas; little benefit to home-rolling them.
2. Your CRUD app is not that different from other apps. Key architectural pieces like routing, or base
components like dropdowns, are functionally the same as other apps so you can leverage some
work that has already been done.
3. The AngularJS team is exceptional and has moved web development forward with both original
and well-implemented existing ideas. You want to leverage their expertise, particularly if you don’t
fully understand what they did. I believe the individual people behind Angular are the biggest and
most subtle difference that set AngularJS apart over the last 5 years.
Reasons specific to front-end development

40. 1. AngularJS: opinionated, strict MV* implementation (2009)
2. Ember: similar to AngularJS. Even more opinionated. (2007)
3. Backbone: philosophically minimalist (2010)
4. ExtJS: requires license, much “heavier” framework (2007)
5. Others: Knockout, SproutCore, Spine, Javascript MVC, GWT, Batman, etc all once popular in 2011-
2013 probably aren’t safe options for 2015-2019+ development
JavaScript MVVM & MVC framework options
jQuery: library/tool (not a framework) and increasingly unnecessary
React (by Facebook): only addresses the “View” part of MVC

41. 1. AngularJS:
a. Pros: more approachable and simpler syntax. More flexible than Ember, more complete than
Backbone. No 3rd party dependencies. More learning materials & larger community.
b. Cons: more concepts to learn in order to master.
2. Ember:
a. Pros: stricter framework, less concepts. Potentially more performant data-binding.
b. Cons: less documentation/community, requires jQuery & Handlebars (larger)
3. Backbone:
a. Pros: lightweight, easy learning curve, very flexible.
b. Cons: you’ll build your own framework on top of it. Routing, templates, dependency injection,
two-way binding etc. Requires jQuery & Underscore.
Frameworks narrowed down

42. AngularJS is (or was) the 3rd-most starred project on Github. Source: AirPair.com, April 2015
Community comparison

43. Search interest over time

44. Job listings: Front-end

45. Job listings: Front-end (cont.)

46. Job listings: Expanded

47. Job listings: Expanded (cont.)

48. AngularJS
by Google

49. ● Built for CRUD apps: not games or GUI editors.
● A complete client-side solution: guides developers through full process and best practices of
building an app.
● Opinionated: serves as a starting point for how apps should be built.
● Simplifies development by providing a higher level of abstraction at the cost of flexibility.
● All code in an app should be testable
● Less boilerplate: “Make common tasks trivial and difficult tasks possible”
● Enhances HTML using custom HTML tags/components which trigger JavaScript functionality.
Philosophy
“AngularJS is what HTML would have been, had it been designed for applications”

50. 1. It’s made up of well thought-out components
2. Developer support: Mature documentation, tutorials, blog posts & formal courses.
3. Community is mature & thriving. Many high quality 3rd party modules & expert opinion available.
4. Directives (UI components) are brilliant: also come with a high learning curve (worth it)
5. Continual improvement: recent versions have addressed many key concerns
6. It’s efficient: fairly lightweight
Why AngularJS?

51. 1. Handles low-level DOM manipulation and marshals data to the UI (data binding)
2. Wires MV* app components together with a clean, modular, reusable architecture
3. Templating: supports complex view hierarchies
4. Dependency injection
5. Routing
6. Form data & validation
7. API requests (XHR)
8. Makes i18n convenient (internationalization)
9. Extensible: can integrate with any other JavaScript/HTML/CSS 3rd party component
Key features

52. 1. SEO: Single page apps are un-indexable. Unsuitable for websites or public-facing apps (like
Craigslist, Amazon).
2. Difficult to test logic in HTML: ng-repeat, ng-show, etc.
3. Legacy browser support: IE9+
4. Lazy-loading modules: possible but not very easy
5. Maintaining state between page reloads. Cookies, localstorage, AJAX
6. Sometimes, it’s too fast: requires fine-tuning to “feel right” to web users
7. Works best with JSON apis: it’s more difficult to use XML or HTML server responses
8. Doesn’t play nicely with server templating: Smarty, Twig, Liquid, etc.
9. Complexity: directives, prototypical inheritance, transclusion, digest, etc. can be difficult concepts.
Why not AngularJS?
All of these gotchas are overcomeable with varying degrees of work. Many of these apply to all SPAs.

53. ● In alpha without a release date (details expected soon at ngEurope in Oct).
● Angular 1.x will be supported for 2 years after 2.0 release.
● Lighter (and simpler?) than Angular 1
● Big gamble: great ideas, very different. “Built for the browsers of the future”.
● Responding to changes in browsers: the web standards body is adding much of what AngularJS
makes possible to browsers. So, Angular 2.0 will do what future browsers won’t.
● Typed JavaScript: embraces TypeScript, a typed superset of JS by Microsoft.
Angular 2.0: bold as hell
Takeaway: My bet is Angular 2.0 will rock… eventually. New apps: Angular 1.x with an eye on
2.0 changes. Existing app rewrites: hold off

54. 1. Written in ES6 (with class-based inheritance), transpiles to ES5 for current browser compatibility.
2. Moving away from the (confusing) JS prototypical inheritance model
3. No more controllers or $scope (concepts remain)
4. Simpler directives
5. Uses ES6 modules instead of custom Angular modules
6. No longer includes jQuery by default
7. Unidirectional data flow (no more two-way binding, more explicit, similar to React?)
8. No more $scope.$apply
9. Better support for touch animations
10. New router
11. New persistence layer
12. … and more
Some Angular 2.0 details

55. 1. Bower: web package manager for 3rd party project dependencies.
2. Grunt: build automation tool. Automate tasks like code minification/obfuscation, code-quality
analysis, versioning, vendor-prefixing, unit testing, releasing, and so much more.
3. SASS (not LESS): Always use a CSS preprocessor these days. SASS seems to have won out over
LESS, with Bootstrap switching.
4. gzipping & CDNs (CloudFlare for easy setup): low-hanging fruit for much faster load times.
5. Yeoman: scaffolding tool for new apps.
6. Firebase: solid database-as-a-service, recently acquired by Google (not only for Angular)
7. Amazon S3 + CloudFlare: extremely easy app hosting for 100% static apps
8. Babel: ES2015 compiler (e.g. use classes now)
Tools that go well with AngularJS

57. ReactJS
by Facebook

58. ● (-) Alpha software (0.13.x): still has breaking changes
● (-) Tiny community & docs: you’ll be trailblazing
● (-) Has a learning curve: may be worth the complexity
● (+) Not too difficult to use: once you understand
● (+) Interoperable: can be used with AngularJS and other frameworks
● (+) Performance impact: needs to be demonstrated. Seems negligible for
typical CRUD apps without large quantities of data in the client.
● (?) Questionable philosophy: HTML in JS? Worth considering
React by Facebook: a virtualized DOM
Core concept: put your HTML into your JavaScript. When your data changes, React performs a diff on
changed HTML and only updates the elements that were affected.
Pros: 1.) faster HTML updates, 2.) “easier to understand UI components because they’re in one file”

59. Hybrid mobile apps
Just not quite there yet

60. 1. Apache Cordova (PhoneGap): runs in a webview.
2. Appcelerator Titanium: JS interpreted at runtime, connects to native
bindings (no webview). Includes ecosystem of app support tools.
3. React Native: ReactJS, for mobile. Technically similar to Titanium.
4. Ionic Framework: commercial product that uses Cordova+AngularJS.
Growing quickly and worth a look. Includes ecosystem of app support
tools, including pre-built UI controls.
HTML5 hybrid mobile app options
Takeaway: I still wouldn’t advise using web tools to create mobile apps, because at a high level:
1.) Creating a native mobile app just really isn’t that hard if you’re serious about it.
2.) iOS and Android are too different and evolve too quickly to keep up with on an abstracted platform.

61. 1. Angular 2.0 breakdown: https://www.airpair.com/angularjs/posts/preparing-for-the-future-of-angularjs
2. How to write good controllers: http://toddmotto.com/rethinking-angular-js-controllers/
3. Performance tips: https://www.airpair.com/angularjs/posts/angularjs-performance-large-applications
4. More perf. tips: http://blog.scalyr.com/2013/10/angularjs-1200ms-to-35ms/
5. JS Style guide: https://github.com/airbnb/javascript
6. Why not to use Angular: https://medium.com/@mnemon1ck/why-you-should-not-use-angularjs-1df5ddf6fc99
7. Angular alts: https://medium.com/este-js-framework/what-i-would-recommend-instead-of-angular-js-62b057d8a9e
8. Ember v.s. Angular: https://www.quora.com/Is-Angular-js-or-Ember-js-the-better-choice-for-JavaScript-frameworks
9. Me! I’m happy to help anybody in the CTO Forum
Thank you! Here are some resources