A Recipe for Modern Mobile Front-end Development

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Development A Recipe for Modern Mobile Frontend HTML5 Conference 2013 2013.11.30 13:00~ @Room5A 5F

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< 10%?

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25%?

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60%?

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No Hand?

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25%!

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Yuya Saito Frontend Developer @ CyberAgent

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events.html5j.org/conference/2013/11/sessions

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Agenda Code Performance Automation

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Code

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Scaffolding

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଍৔ Scaffolding

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Brunch brunch.io

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Yeoman yeoman.io

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$44ϓϦϓϩηοαͷίϯύΠϧ $P⒎FF4DSJQUͳͲͷίϯύΠϧ ϑΝΠϧͷ࿈݁ϛχϑΝΠ Ϣχοτςετ +4)JOU΍$44-JOUͳͲͷ-JOUπʔϧ ࣗಈϦϩʔυ

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Too much to set up? Just modify it!

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Coding Guideline

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Code is read much more often than it is written, so plan accordingly. - Raymond Chen ❞

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ίʔυ͸ॻ͘ػձΑΓಡΉػձͷํ ͕ѹ౗తʹଟ͍ɻ ͔ͩΒͦ͜ɺ ͔ͬ͠Γͱܭը͢Δ΂͖ͩɻ - Raymond Chen ❞

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JavaScript

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github.com/airbnb/javascript

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github.com/Seravo/js-winning-style

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CSS

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github.com/csswizardry/CSS-Guidelines

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github.com/necolas/idiomatic-css

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HTML / CSS

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by ୩୓थ Ϟμϯͳ$44ઃܭύλʔϯΛߟ͑Δ 16:15~ @ Room1A 1F

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❌

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Interactions Animations

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ίʔυ͸ཧղ͠΍͘͢ͳ͚Ε͹ ͳΒͳ͍ɻ

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Philip Walton Frontend software engineer @ Appfolio

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Predictable Reusable Maintainable Scalable

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Methodologies

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by Nicole Sullivan OOCSS

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Object in CSS:

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Basically, a CSS “object” is a repeating visual pattern, which can be abstracted into an independent snippet of HTML, CSS, and possibly JavaScript. Once created, an object can then be reused throughout a site. - Nicole Sullivan ❞

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جຊతʹ$44ʹ͓͍ͯɺ ͋Δ ʮΦϒδΣΫτʯ ͱ͸܁Γฦ͞ΕΔϏ δϡΞϧύλʔϯͰ͋Γɺ )5.-΍$44ɺ ΋͔͢͠Δͱ+BWB4DSJQUͰॻ͔Εͨಠཱ͠ ͨεχϖοτͱͯ͠ந৅ԽͰ͖Δ΋ͷͰ͋ Δɻ ·ͨҰ౓ੜ੒ͨ͠ΦϒδΣΫτ͸ αΠτ಺Ͱ࠶ར༻Ͱ͖Δ΋ͷͰ͋Δɻ ❞ - Nicole Sullivan

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github.com/stubbornella/oocss/wiki

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by Jonathan Snook SMACSS

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Base State Layout Module Theme

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Base is the default

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State is ...uh, state

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smacss.com/ja

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by Yandex BEM

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Block Element Modifier

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We used BEM principles to create a set of front-end development techniques and tools, that allow us to build websites quickly and maintain them over a long time. ❞

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BEM can pick up where SMACSS left off.

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bem.info

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Build Systems, Not Pages.

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OOCSS, SMACSS, BEM are just ONE of the solutions!

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JavaScript

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MV*

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Backbone.js Ember.js Angular.js

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SPAs Single Page Applications

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Pros / Cons

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Pros

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Simplify Server Side Tasks +40/Λڙڅ͢Δ୯७ͳ"1*αʔϏεͷ Α͏ʹͳΔ

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Runs Almost Anywhere +4͕࣮ߦͰ͖Δ؀ڥͰ͋Ε͹ɺ Ͳ͜Ͱ΋ ಈ࡞͢Δ

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Many Existing Toolkits ͢Ͱʹଟ͘ͷϑϨʔϜϫʔΫ΍πʔϧ͕ ଘࡏ͢Δ

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Cons

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Bad for Performance +BWB4DSJQUϑΝΠϧαΠζͷංେԽ

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No SEO Ϋϩʔϥ͸+BWB4DSJQUΛ࣮ߦ͠ͳ͍

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Progressive Enhancement ωοτϫʔΫରԠ΍ύϑΥʔϚϯεʹ ؔΘΔΤϯϋϯεϝϯτ͕೉͍͠

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by LZP@BHP 14:00~ @ Room5B 5F ΦϑϥΠϯ8FCΞϓϦέʔγϣϯͷ ʮબ୒ࢶʯ

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by খݪོ࿠ 16:15~ @ Room5A 5F ஍ԼమYαΫαΫY͜Ε͔Βͷ 8FCήʔϜΞϓϦ͕උ͑Δ΂͖ ͭͷػೳ

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Performance in SPAs

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CSS JS

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⏳

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is on Google PageSpeed Insights ATF

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A T F bove he old ϑΝʔετϏϡʔ

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from Server HTML Just for this area ONLY

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Performance

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Jeff Atwood AKA Coding Horror

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To me, performance is a feature [...] I think there's also a lesson to be learned here about the competitive landscape of the public internet, where there are two kinds of websites: the quick and the dead. ❞ - Jeﬀ Atwood

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ࢲ͸ύϑΥʔϚϯεΛػೳͰ͋Δͱ ߟ͍͑ͯΔɻ <>͜ͷڝ૪ͷଟ͍Πϯλʔωοτͷੈք Ͱ஌͓ͬͯ͘΂͖Ϩοεϯ͕͋Δͱ͠Βɺ ͜ͷੈʹ͸छྨͷ8FCαΠτ͔͠ͳ͍ ૣ͍͔ɺࢮΜͰ͍Δ͔ͷͲͪΒ͔ͩɻ - Jeﬀ Atwood ❞

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Someday... Not Now.

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Performance ϖʔδ͕ಡΈࠐ·ΕΔ·Ͱͷ଎͞ Ϣʔβૢ࡞ʹର͢ΔϑΟʔυόοΫͷ଎͞

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ϖʔδ͕ಡΈࠐ·ΕΔ·Ͱͷ଎͞ Page Load Performance

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Steve Souders Web Performance Engineer

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Performance Budget

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1 second

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www.nngroup.com/articles/response-times-3-important-limits

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1 second!? "5'಺ͳΒͳΜͱ͔ʜʜ

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www.strangeloopnetworks.com/web-performance-infographics

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(More Realistic) Performance Budget: 3 seconds

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Case Study: Fail

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Case 1: ը૾ͷ࠷దԽॲཧ๨Ε

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Case 2: $44ϑΝΠϧαΠζ͕ڊେ

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Case 2: $44ϑΝΠϧαΠζ͕ڊେ DataURI? CSS Sprite!

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Case 2: $44ϑΝΠϧαΠζ͕ڊେ Preprocessor? Check CSS!

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"Tools, not rules!" - Paul Lewis

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Google PageSpeed Insights

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Google PageSpeed Insights developers.google.com/speed/pagespeed/insights

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Google Chrome DevTools

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Google Chrome DevTools developers.google.com/chrome-developer-tools

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WebPageTest.org

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WebPageTest.org www.webpagetest.org

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Ϣʔβૢ࡞ʹର͢ΔϑΟʔυόοΫͷ଎͞ Rendering Performance

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by ࠤ౻า 17:15~ @ Room5B 5F 8FCϑϩϯτΤϯυͷ ϨϯμϦϯάύϑΥʔϚϯεͱ ࠷దԽ5JQT

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16.66ms

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24FPS

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Frame Per Second ඵʹίϚ

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Jank Busters Chrome Rendering Performance via jankfree.org/jank-busters-io-2013/template.html#6

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Paint / Layout

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Paint Scroll, Animation and etc...

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DOM Node DOM Node DOM Node DOM Node DOM Node Node

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Layout

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gent.ilcore.com/2011/03/how-not-to-trigger-layout-in-webkit.html

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Analyze in DevTools Again, "Tools, not rules!"

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Timeline Panel

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Timeline Panel developers.google.com/chrome-developer-tools/docs/timeline

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Show Paint Rectangles

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Show Paint Rectangles

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Continuous Page Repainting

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Continuous Page Repainting

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Automation

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gruntjs.com

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by ੴຊޫ࢘ 17:15~ @ Room1A 1F ࠓͲ͖ͷ(SVOUΛ࢖ͬͨ ϑϩϯτΤϯυ։ൃ ʢ)5.-$44ฤʣ

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What should we Automate? ͳʹΛࣗಈԽͰ͖Δͷ͔ʁ

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ը૾ϑΝΠϧͷ࠷దԽ +BWB4DSJQU΍$44ͷϑΝΠϧͷ݁߹ ΞΠίϯϑΥϯτͷੜ੒ ߴղ૾౓σΟεϓϨΠ΁ͷରԠ εϓϥΠτγʔτͷੜ੒ ...

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Automate anything you’ll likely do more than ONCE! ೋ౓͋Δ͜ͱ͸ɺ ࡾ౓͋Δ

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෼͔͔ΔλεΫ͕͋Δͱͨ͠Β ෼͔͚ͯͦͷλεΫΛߦ͏ͨΊͷ ϓϩάϥϜΛॻ͍ͯ෼Ͱ࣮ߦ͢Δɻ ❞

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Finally...

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No ONE best practice!

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ຊ೔఻͍͑ͨࣄ ηογϣϯͰ͓࿩ͨ͜͠ͱ͸ɺ ͢΂ͯͷ໰୊ʹର͢ΔղͰ͸ͳ͍ɻ

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It depends!

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John. F Kennedy 35th President of USA

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There are risks and costs to a program of action, but they are far less than the long-range risks and costs of comfortable inaction. ❞ - John. F Kennedy

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ߦಈʹ͸ͭͶʹةݥ΍୅ঈ͕൐͏ɻ ͔ͦ͠͠Ε͸ɺ ߦಈͤͣʹָΛܾΊ͜ Μͩ࣌ͷ௕ظతͳةݥ΍ίετͱֱ΂ Ε͹ɺ औΔʹ଍Βͳ͍ɻ - John. F Kennedy ❞

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