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EmberJS Introduction - T3CON12
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tomdale
October 05, 2012
Technology
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1.3k
EmberJS Introduction - T3CON12
Introduction to Ember.js, presented at the TYPO3 conference in Stuttgart, Germany.
tomdale
October 05, 2012
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Transcript
None
Building Ambitious Web Apps
jQuery
None
Great for manipulating pages. Not so great for building large
apps.
None
None
None
None
You can simulate an application by having the logic run
on the server, and serving a series of pages
None
500ms The problem with this is that your user interface
can only respond as fast as your server—especially bad on flaky 3G connections
Fix this by moving *all* of the logic to the
client. The client has all of the application logic and HTML templates to render in the browser.
{ name: "Christian", occupation: "Engineer" } Instead of sending HTML,
send JSON. Only request data that the client has not yet loaded. Instant response when showing data that has already been fetched.
By decoupling the user interface from the typical HTTP request/
response cycle, you can completely modify how updates are communicated to the client. WebSocket
None
Mobile Cocoa Touch Android SDK Desktop Cocoa .NET Web ?
Mobile Cocoa Touch Android SDK Desktop Cocoa .NET Web
What do client-side frameworks provide?
User Interface Data Persistence Application Architecture
User Interface HTML+CSS Data Persistence ? Application Architecture ?
User Interface HTML+CSS Data Persistence Application Architecture
User Interface View Data Persistence Model Application Architecture Controller
MVC
Enhance JavaScript
Classes Person = Ember.Object.extend({ firstName: null, lastName: null });
Mixins Speaker = Ember.Mixin.create({ hello: function() { var first =
this.get('firstName'), last = this.get('lastName'); alert(first + " " + last + ": HELLO!") } }); Person = Ember.Object.extend(Speaker); Person.create({ firstName: "Yehuda", lastName: "Katz" }).hello();
Mixins Speaker = Ember.Mixin.create({ hello: function() { var first =
this.get('firstName'), last = this.get('lastName'); alert(first + " " + last + ": HELLO!") } }); Person = Ember.Object.extend(Speaker); Person.create({ firstName: "Yehuda", lastName: "Katz" }).hello();
Mixins + super Speaker = Ember.Mixin.create({ hello: function() { var
first = this.get('firstName'), last = this.get('lastName'); return first + " " + last + ": HELLO"; } }); Dog = Ember.Object.extend(Speaker, { hello: function() { return this._super() + " THIS IS DOG"; } }); var phil = Dog.create({ firstName: "Budweiser", lastName: "Phil", hello: function() { return this._super() + " ZAAAAAAAA"; } }); alert(phil.hello());
Computed Properties Person = Ember.Object.extend({ fullName: function() { return this.get('firstName')
+ ' ' + this.get('lastName'); }.property('firstName', 'lastName') }); var yehuda = Person.create({ firstName: "Yehuda", lastName: "Katz" }); alert(yehuda.get('fullName'));
Uniform Access
“ Bertrand Meyer Uniform Access All services offered by a
module should be available through a uniform notation, which does not betray whether they are implemented through storage or through computation.
Namespaces >> Core = Ember.Namespace.create(); >> Core.Person = Ember.Person.extend(); >>
Core.Person.toString(); => Core.Person >> Core.Person.create().toString(); => <Core.Person:ember157> No more [object Object]!
Names in Conventions App.Post = DS.Model.extend({ title: DS.attr('string'), body: DS.attr('string')
}); // vs. App.Post = DS.Model.extend({ collectionURL: "/posts", singleURL: "/post", title: DS.attr('string'), body: DS.attr('string') });
Application Structure
Model View Controller
Model View Controller Router
Router •ORMs model persistent state as objects •The router models
application state as objects •Maps the browser‘s URL to app state
Router Private Blog Not Logged In Logged In Index Show
Post Edit Post
Router Private Blog Not Logged In Logged In Index Show
Post Edit Post
Router Private Blog Not Logged In Logged In Index Show
Post Edit Post /login
Router /posts Private Blog Not Logged In Logged In Index
Show Post Edit Post
Router /post/123 Private Blog Not Logged In Logged In Index
Show Post Edit Post
Advantages •Never be in an unknown state •Find errors faster
•Create a map of user actions
TypeError: Cannot call method 'showPhoto' of undefined
Entered state "notLoggedIn" Sent event "enterCredentials" Entered state "loggedIn" Entered
state "loggedIn.index" Sent event "showPost" Entered state "loggedIn.showPost" Could not respond to event "editPost" in state "loggedIn.showPost"
Why Ember?
Ember is not a throwaway weekend project or a corporate-sponsored
project. It is built by and for the Ember community, an open source project first and only.
100% Open Source Built by the Community Ember is not
a throwaway weekend project or a corporate-sponsored project. It is built by and for the Ember community, an open source project first and only.
•Manages complexity •MIT-licensed •More productive •Aggressively rolls in best practices
•Built for the long haul
As patterns solidify, we roll them in.
Sometimes we give them a little push.
Thank you. Questions? http://plus.tomdale.net http://emberjs.com