Ember.js at FrOSCon 2013

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Ember.js Stefan Wintermeyer stefan.wintermeyer@amooma.de @wintermeyer

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stefan.wintermeyer@amooma.de @wintermeyer

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stefan.wintermeyer@amooma.de @wintermeyer

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stefan.wintermeyer@amooma.de @wintermeyer Was soll das ganze Bohei um dieses JavaScript Framework?

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stefan.wintermeyer@amooma.de @wintermeyer Ich erstelle seit 20 Jahren Webseiten.

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stefan.wintermeyer@amooma.de @wintermeyer 1996

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stefan.wintermeyer@amooma.de @wintermeyer Bis 2013 bin ich sehr gut ohne JavaScript Framework ausgekommen.

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stefan.wintermeyer@amooma.de @wintermeyer Ich bin sogar viel besser ohne JavaScript, als mit JavaScript gefahren.

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stefan.wintermeyer@amooma.de @wintermeyer Was hat sich also geändert?

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stefan.wintermeyer@amooma.de @wintermeyer Evergreen Webbrowser! Man muss sich nicht mehr mit Fehlern von vor 5 Jahren beschäftigen.

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stefan.wintermeyer@amooma.de @wintermeyer Zur klassischen Webseite hat sich die Webapplication gesellt.

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stefan.wintermeyer@amooma.de @wintermeyer Mit Ember.js kann man solche Single Page Webapplications erstellen ohne das Rad neu zu erﬁnden.

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stefan.wintermeyer@amooma.de @wintermeyer Vergleich Klassisch vs. Single Page

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stefan.wintermeyer@amooma.de @wintermeyer

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stefan.wintermeyer@amooma.de @wintermeyer http://www.spiegel.de Klassisch auf dem Server generierte Webseite.

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stefan.wintermeyer@amooma.de @wintermeyer http://discuss.emberjs.com Per JavaScript (Ember.js) im Browser generiert.

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stefan.wintermeyer@amooma.de @wintermeyer Aber dafür muss man bestimmt Schiffsladungen an JavaScript laden!?

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stefan.wintermeyer@amooma.de @wintermeyer HTML 38,7 KB JavaScript 321,8 KB HTML 11,5 KB JavaScript 278,6 KB

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stefan.wintermeyer@amooma.de @wintermeyer Kleinvieh macht auch Mist!

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stefan.wintermeyer@amooma.de @wintermeyer Ember.js ist „snappy“. Warum ist das wichtig?

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What's the impact of slow sites? Lower conversions and engagement, higher bounce rates... Ilya Grigorik @igrigorik Make The Web Faster, Google Have a look at Ilya‘s book!

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Usability Engineering 101 Delay User reaction 0 - 100 ms Instant 100 - 300 ms Feels sluggish 300 - 1000 ms Machine is working... 1 s+ Mental context switch 10 s+ I'll come back later... Stay under 250 ms to feel "fast". Stay under 1000 ms to keep users attention. @igrigorik

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Performance Related Changes and their User Impact Web Search Delay Experiment @igrigorik • The cost of delay increases over time and persists • Delays under half a second impact business metrics • "Speed matters" is not just lip service Type of Delay Delay (ms) Duration (weeks) Impact on Avg. Daily Searches Pre-header 50 4 Not measurable Pre-header 100 4 -0.20% Post-header 200 6 -0.59% Post-header 400 6 -0.59% Post-ads 200 4 -0.30%

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Performance Related Changes and their User Impact Server Delays Experiment • Strong negative impacts • Roughly linear changes with increasing delay • Time to Click changed by roughly double the delay @igrigorik

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Yo ho ho and a few billion pages of RUM How speed affects bounce rate @igrigorik

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For many, mobile is the one and only internet device! Country Mobile-only users Egypt 70% India 59% South Africa 57% Indonesia 44% United States 25% onDevice Research @igrigorik

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The (short) life of our 1000 ms budget 3G (200 ms RTT) 4G(80 ms RTT) Control plane (200-2500 ms) (50-100 ms) DNS lookup 200 ms 80 ms TCP Connection 200 ms 80 ms TLS handshake (200-400 ms) (80-160 ms) HTTP request 200 ms 80 ms Leftover budget 0-400 ms 500-760 ms Network overhead of one HTTP request! @igrigorik The browser needs 100 - 150ms to render the page.

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stefan.wintermeyer@amooma.de @wintermeyer Woraus besteht eine Ember.js Application?

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stefan.wintermeyer@amooma.de @wintermeyer userlist !"" css # !"" bootstrap-responsive.css # $"" bootstrap.css !"" img !"" index.html $"" js !"" app.js $"" libs !"" ember.js !"" ember-data.js !"" handlebars.js !"" jquery-1.9.1.js $"" md5.js

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stefan.wintermeyer@amooma.de @wintermeyer {{#each this itemController="user"}} {{#if syntacticallyPlausableEmail}}

{{firstName}} {{lastName}} {{#unless isNew}} {{#linkTo 'user.edit' this activeClas {{/unless}} {{/each}} Auszug index.html

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stefan.wintermeyer@amooma.de @wintermeyer {{#each this itemController="user"}} {{#if syntacticallyPlausableEmail}}

{{firstName}} {{lastName}} {{#unless isNew}} {{#linkTo 'user.edit' this activeClas {{/unless}} {{/each}} Auszug index.html

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stefan.wintermeyer@amooma.de @wintermeyer {{#each this itemController="user"}} {{#if syntacticallyPlausableEmail}}

{{firstName}} {{lastName}} {{#unless isNew}} {{#linkTo 'user.edit' this activeClas {{/unless}} {{/each}} Auszug index.html

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stefan.wintermeyer@amooma.de @wintermeyer {{#each this itemController="user"}} {{#if syntacticallyPlausableEmail}}

{{firstName}} {{lastName}} {{#unless isNew}} {{#linkTo 'user.edit' this activeClas {{/unless}} {{/each}} Auszug index.html

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stefan.wintermeyer@amooma.de @wintermeyer {{#each this itemController="user"}} {{#if syntacticallyPlausableEmail}}

{{firstName}} {{lastName}} {{#unless isNew}} {{#linkTo 'user.edit' this activeClas {{/unless}} {{/each}} Auszug index.html

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stefan.wintermeyer@amooma.de @wintermeyer {{#each this itemController="user"}} {{#if syntacticallyPlausableEmail}}

{{firstName}} {{lastName}} {{#unless isNew}} {{#linkTo 'user.edit' this activeClas {{/unless}} {{/each}} Auszug index.html

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stefan.wintermeyer@amooma.de @wintermeyer App = Ember.Application.create(); App.Router.map(function() { this.resource('about'); this.resource('users', function() { this.route('new'); this.resource('user', { path: ':user_id' }, this.route('edit'); }); }) }); App.UsersRoute = Ember.Route.extend({ model: function() { return App.User.find(); } }); Auszug app.js

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stefan.wintermeyer@amooma.de @wintermeyer App.User = DS.Model.extend({ firstName: DS.attr('string'), lastName: DS.attr('string'), email: DS.attr('sting') }); App.User.FIXTURES = [{ id: 1, firstName: "Linus", lastName: "Torvalds", email: "torvalds@linux-foundation.org" }, { id: 2, firstName: "John", lastName: "Hall", email: "maddog@li.org" }, { Auszug app.js

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stefan.wintermeyer@amooma.de @wintermeyer Demo (ix 8/2013)

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stefan.wintermeyer@amooma.de @wintermeyer

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stefan.wintermeyer@amooma.de @wintermeyer User anlegen

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stefan.wintermeyer@amooma.de @wintermeyer

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stefan.wintermeyer@amooma.de @wintermeyer Edit und Undo

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stefan.wintermeyer@amooma.de @wintermeyer

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stefan.wintermeyer@amooma.de @wintermeyer Transaktionen

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stefan.wintermeyer@amooma.de @wintermeyer

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stefan.wintermeyer@amooma.de @wintermeyer Ende der Demo (ix 8/2013)

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stefan.wintermeyer@amooma.de @wintermeyer Heute ist jeder fast überall online.

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stefan.wintermeyer@amooma.de @wintermeyer Online- und Ofﬂine- Modus bei einer Webapplikation!

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stefan.wintermeyer@amooma.de @wintermeyer Mobile First

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stefan.wintermeyer@amooma.de @wintermeyer Danke!