Reactで学ぶ！いまどきのWeb開発

by Amagi

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BNBHJUBLBZPTJ 3FBDUͰֶͿ ͍·Ͳ͖ͷ8FC։ൃ 3FBDUͰֶͿ ͍·Ͳ͖ͷ8FC։ൃ BNBHJUBLBZPTJ BNBHJUBLBZPTJ

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ࢿྉ • ڭՊॻ  https://github.com/fand/react-hands-on • ߨٛεϥΠυ  https://speakerdeck.com/fand/reactdexue- bu-imadokifalsewebkai-fa

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ಥવͰ͕͢ ͓ئ͍͕͋Γ·͢

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͍·͙͢ HJUDMPOF ͍ͯͩ͘͠͞ʂ

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·ͣ͸Node.jsΠϯετʔϧ • https://nodejs.org/ja/ ͔Βμ΢ϯϩʔυ

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ϨϙδτϦΛ git clone $ git clone https://github.com/fand/react-hands-on • ·ͨ͸ zipͰμ΢ϯϩʔυ

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$ cd react-hands-on $ npm install ґଘϥΠϒϥϦ΋Πϯετʔϧ

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վΊ·ͯ͠amagiͰ͢

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IUUQEFWFMPQFSIBUFOBTUBDPNFOUSZ 1PEDBTUװ׏גתׅ

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͜ͷϋϯζΦϯͰ΍Δ͜ͱ • ReactͰWebαΠτΛ࡞Δ • ReactͱɺͦͷपลͰى͍ͬͯ͜Δ  ։ൃ؀ڥͷมԽʹֶ͍ͭͯͿ

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ࠓ͔Β࡞ΔWebαΠτ

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ڭՊॻ: https://github.com/fand/react-hands-on • ௥Ճ/มߋ͢Δίʔυ͕εςοϓຖʹॻ͔Ε͍ͯΔ

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diffͷݟํ

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diffͷݟํ ʮςΫετʯΛ ʮςΩετʯʹมߋ

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diffͷݟํ ϑΝΠϧ຤ඌʹ ʮZPʯΛ௥Ճ

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ඪޠ: JS͕ Θ͔Βͳͯ͘΋ ؾʹ͠ͳ͍ • ࠓ೔͸ReactΛֶͼ·͢  (JSΛֶͼ͍ͨΘ͚Ͱ͸ͳ͍) • ΨϯΨϯίϐϖ͠Α͏ʂʂʂ • ٧·ͬͨΒ໛ൣղ౴Λར༻͠Α͏ ʂʂ

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develop developϒϥϯνʹ͓खຊ͋Γ·͢ master

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develop master HJUͷλά

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developϒϥϯνͷ࢖͍ํ • օ͞Μ͸masterͰ࡞ۀ͠·͢ • ʮͳΜ͔͓͔͍͠ʂಈ͔ͳ͍ʂʯͱ͔  ʮ·ͩॻ͍ͯΔ్தͳͷʹʙʂʯͱͳͬͨΒ  git checkout step-n ͠·͠ΐ͏ • ྫ) Step 2 Ͱ٧·ͬͨΒ git checkout step-2

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ׁ׏׉ֻ כׄ׭ת׃׳ֲ

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Step 1: αʔόʔΛىಈ • $ npm run dev • http://localhost:3000/ ʹΞΫηε

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ىಈ੒ޭʂ • pages/ ʹϑΝΠϧ͕͋Δ • Reactίϯϙʔωϯτ

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͜ͷϨϙδτϦͷߏ଄ • pages/ ʹJSϑΝΠϧ͕͋Δ • pages/index.js ΛݟͯΈΑ͏

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index.jsͷΑ͏͢

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index.jsͷΑ͏͢ U 3FBDUίϯϙʔωϯτ

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index.jsͷΑ͏͢ 3FBDU&MFNFOUΛฦ͢ ؔ਺ʹͳ͍ͬͯΔ U

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• ReactͰWebαΠτ࡞ΔͨΊͷϑϨʔϜϫʔΫ • ࣗಈͰ৭ʑ΍ͬͯ͘ΕΔ • Hot Module Reloading • Server-Side Rendering Next.js

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pages/index.js Λฤूͯ͠ΈΑ͏ • Ϧϩʔυ͠ͳͯ͘΋൓ө͞ΕΔ͸ͣ

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Hot Module Reloading (HMR) • ϑΝΠϧΛฤूͨ͠Βɺฤूͨ͠෦෼͚ͩ  Ϧϩʔυͯ͘͠ΕΔ • ຊདྷ͸Webpackͷػೳ • Next.js͕উखʹWebpackىಈͯ͘͠ΕͯΔ

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“Server-Side Rendering” ͱ͸ʁ

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ී௨ͷJS • αʔόʔଆͰϨϯμϦϯά

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ී௨ͷJS • αʔόʔଆͰϨϯμϦϯά • JSͰಈ͖Λ͚ͭΔ • αʔόʔଆͰϨϯμϦϯά

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Single Page Application (SPA) • JSͰશ෦ඳը͢Δ

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Single Page Application (SPA) • JSͰશ෦ඳը͢Δ

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"SPAͷϝϦοτ" • HTMLϦΫΤετ͕ݮΔ • AjaxͰσʔλΛऔಘ͠ɺJSͰඳը͢Δ • ϖʔδભҠ࣌΋ɺϖʔδ͕ਅͬനʹͳΒͳ͍ • શ෦JSͰॻ͚Δ • αʔόʔͷॲཧ͕୯७ʹͳΔ

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#SPAͷ໰୊఺# • HTMLϑΝΠϧ͸നࢴ • ࠷ॳʹਅͬനͳը໘͕දࣔ͞Εͯ͠·͏ • SEOʹऑ͍

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Server-Side Rendering • ReactͷϨϯμϦϯάΛαʔόʔଆͰߦͳ͏ʂ

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Server-Side Rendering • ReactͷϨϯμϦϯάΛαʔόʔଆͰߦͳ͏ʂ

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։ൃऀπʔϧͰݟΔͱ • HTMLϑΝΠϧʹͪΌΜͱத਎͕͋Δ

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Step 2: AboutϖʔδΛ࡞Δ • pages/about.js Λ࡞੒ • ΄΅ pages/index.js ͱಉ͡

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pages/about.jsΛ࡞੒

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http://localhost:3000/about Λ֬ೝ

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Step 3: ڞ௨ίϯϙʔωϯτΛ࡞Δ • ϨΠΞ΢τ౳ɺෳ਺ͷϖʔδͰ࢖͏ύʔπΛ  ίϯϙʔωϯτʹ੾Γग़͢ • component/ ϑΥϧμΛ࡞Γɺͦͷதʹ  layout.js Λ࡞Δ • ͦͷޙɺ pages/ ಺ͷϑΝΠϧʹ  ίϯϙʔωϯτΛૠೖ͢Δ

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components/layout.js

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components/layout.js IFBEཁૉ

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components/layout.js શϖʔδڞ௨ͷ ϔομʔ

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components/layout.js ϖʔδͷத਎Λ ಡΈࠐΜͰ͍Δ

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pages/index.js ϖʔδશମΛ -BZPVUͰғΉ

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pages/about.js JOEFYKTಉ༷

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ϒϥ΢βͰ֬ೝ͠Α͏

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Step 4: CSSΛಋೖ͢Δ • ReactͰCSSΛ࢖͏ํ๏ • ී௨ʹॻ͍ͯ link λάͰಡΈࠐΉ • CSS in JS • ࠓճ͸ CSS in JS ͯ͠Έ·͢

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CSSͷ೉͍͠ॴ • ໊લۭ͕ؒάϩʔόϧ • ༏ઌ౓ • ม਺΍ؔ਺͕࢖͑ͳ͍

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CSS։ൃͷਐԽ • Sass, Less౳ͷϓϦϓϩηοα • PostCSS • CSS in JS

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CSS in JS • ʮJSͰελΠϧΛఆٛͯ͠  ίϯϙʔωϯτͷstyleଐੑʹͭͬ͜΋͏ͥʯ  ͱ͍͏ൃ૝ • Next.jsͰ͸σϑΥϧτͰ࢖͑Δ • ΍ͬͯΈΑ͏ʂ

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components/layout.jsΛमਖ਼ $44JO+4༻ ϥΠϒϥϦΛϩʔυ

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components/layout.jsΛमਖ਼ CPEZཁૉͷ$44

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ελΠϧΛఆٛͯ͠ ཁૉʹ౉͢

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⚡ελΠϧ͕ద༻͞Εͨ⚡

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ͳΜͰίϨͰಈ͘ͷ……ʁ • next/css ͸֤ཁૉʹҰҙͳΫϥε໊Λੜ੒͠ɺ  ͦͷΫϥεʹରͯ͠ελΠϧΛఆٛ͢Δ

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Step 5: ϋϯόʔΨʔϘλϯΛ௥Ճ͢Δ • ֎෦ͷCSSϥΠϒϥϦΛಡΈࠐΜͰ  ϘλϯΛදࣔͯ͠ΈΑ͏ • ࠓճ͸ jonsuh/hamburgers Λར༻͠·͢

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components/hamburger.jsΛ࡞੒

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components/hamburger.jsΛ࡞੒

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components/layout.jsΛमਖ਼

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components/layout.jsΛमਖ਼ ֎෦$44Λϩʔυ

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දࣔ੒ޭ

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Step 6: ϋϯόʔΨʔϘλϯΛಈ͔͢ • ͜͜·ͰͷReactίϯϙʔωϯτ͸  ঢ়ଶΛ΋ͨͳ͔ͬͨ • ϋϯόʔΨʔϘλϯʹঢ়ଶΛ௥Ճ͠  ಈ͔ͯ͠ΈΑ͏ʂ

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Reactίϯϙʔωϯτͷछྨ • ঢ়ଶͷͳ͍ίϯϙʔωϯτ:  ReactElement Λฦؔ͢਺ • ঢ়ଶͷ͋Δίϯϙʔωϯτ:  React.Component Λܧঝ͢ΔΫϥε • render() ϝιουͰ ReactElement Λฦ͢

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ReactElement is Կ • JSXͰੜ੒͞ΕΔΦϒδΣΫτ ͍ͭ͜ͷ͜ͱ

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components/hamburger.jsΛमਖ਼

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components/hamburger.jsΛमਖ਼ ঢ়ଶΛఆٛ

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components/hamburger.jsΛमਖ਼ ঢ়ଶΛมߋ͢Δؔ਺

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components/hamburger.jsΛमਖ਼ ΫϦοΫͨ͠Β UPHHMF ΛݺͿΑ͏ʹ

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͏͍ͨ͝ʂ

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Step 7: αΠυόʔΛ௥Ճ • TopϖʔδɺAboutϖʔδͷϦϯΫΛද͍ࣔͨ͠ • components/sidebar.jsͰαΠυόʔΛ࡞੒͠  components/layout.jsʹૠೖ͢Δ

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components/sidebar.js

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OFYUMJOLΛར༻͠ ϦϯΫΛ࡞੒

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components/layout.jsΛमਖ਼ 4JEFCBSΛϩʔυ 4JEFCBSΛૠೖ (লུ) … …

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αΠυόʔ͕දࣔ͞Εͨ

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Step 8: αΠυόʔΛಈ͔͢ • HamburgerͰ؅ཧ͍ͯ͠Δঢ়ଶΛ  Sidebarʹ΋఻͍͑ͨ • LayoutͰঢ়ଶΛ؅ཧ͠  HamburgerͱSidebarʹ౉͢Α͏ʹ͢Δ

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ϘλϯΛԡͨ͠ͱ͖ͷྲྀΕ -BZPVU 4JEFCBS )BNCVSHFS JT4JEFCBS"DUJWFGBMTF

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-BZPVU 4JEFCBS )BNCVSHFS ΫϦοΫ͞ΕͨΑʙ JT4JEFCBS"DUJWFGBMTF

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-BZPVU JT4JEFCBS"DUJWFGBMTF JT4JEFCBS"DUJWFUSVF JT4JEFCBS"DUJWFUSVF 4JEFCBS )BNCVSHFS ঢ়ଶΛมߋ

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-BZPVU 4JEFCBS )BNCVSHFS JT4JEFCBS"DUJWFUSVF JT4JEFCBS"DUJWFUSVF ঢ়ଶ͕఻ΘΔ

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-BZPVU 4JEFCBS )BNCVSHFS JT4JEFCBS"DUJWFUSVF JT4JEFCBS"DUJWFUSVF දࣔΛ੾Γସ͑Δ

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components/layout.jsΛमਖ਼

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components/layout.jsΛमਖ਼ U )BNCVSHFSʹ͋ͬͨ ঢ়ଶΛ؅ཧ͢Δॲཧ

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)BNCVSHFS 4JEFCBSʹ ঢ়ଶΛ౉͢

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components/hamburger.jsΛमਖ਼

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components/hamburger.jsΛमਖ਼ QSPQTͰঢ়ଶΛड͚औΔ͚ͩ

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components/sidebar.jsΛमਖ਼

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components/sidebar.jsΛमਖ਼ QSPQTΛड͚औͬͯ දࣔΛ੾Γସ͑Δ

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αΠυόʔ΋ಈ͍ͨʂ

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·ͱΊ

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ࠓ೔ֶΜͩ͜ͱ • React ΞϓϦέʔγϣϯͷ࡞Γํ • Single Page Application (SPA) • Server-Side Rendering (SSR) • Hot Module Reloading (HMR) • CSS in JS

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͓͔ͭΕ͞·Ͱͨ͠ʂ

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ؾܰʹ࣭໰͍ͯͩ͘͠͞ w 5XJUUFSͰϝϯγϣϯͨ͠Γ  IUUQTUXJUUFSDPNBNBHJUBLBZPTJ w (JU)VCͰJTTVFཱͯͨΓ  IUUQTHJUIVCDPNGBOESFBDUIBOETPO ؾܰʹ࣭໰͍ͯͩ͘͠͞ w 5XJUUFSͰϝϯγϣϯͨ͠Γ  IUUQTUXJUUFSDPNBNBHJUBLBZPTJ w (JU)VCͰJTTVFཱͯͨΓ  IUUQTHJUIVCDPNGBOESFBDUIBOETPO