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͍·͞Βฉ͚ͳ͍React @WEBΤϯδχΞษڧձ#03

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Introduction •zuckey •developer at Yappli •React, PHP, Laravel •twitter: @zuckey_17 •Podcastʮ͕͠ͳ͍ϥδΦʯύʔιφϦςΟʔ •https://shiganai.org

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React A JavaScript library for building user interfaces
 https://reactjs.org/

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ࠓ೔࿩͢͜ͱ •ReactΛcreate-react-appΛ࢖ͬͯ৮ͬͯΈΔ •จ๏΋ͬ͘͟Γ঺հ •ॳΊ·ͯ͠ͷޙͷτϐοΫ঺հ

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React •JavaScriptͰUIΛॻͨ͘ΊͷϥΠϒϥϦ •͋͘·ͰUIͳͷͰϨϯμϦϯάઌ͸ԿͰ΋ྑ͍
 (ઐ༻ͷϥΠϒϥϦ͕ผʹ༻ҙ͞Ε͍ͯΔ) •DOM, Native, VR … Ի੠Λग़ྗ͍ͯ͠Δํ΋͍ͨΓ HTML, CSS iOS, Android VR etc…

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ReactͷΠϝʔδ

DOMͰ͸ͳ͍ཁૉͷू·ΓΛ JSX(ޙग़)Ͱॻ͘ DOMͱͯ͠ϨϯμϦϯά

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create-react-appʹΑΔReactͷ͸͡Ί͔ͨ •Node.jsΛΠϯετʔϧ (6.x ~) •create-react-app •$ npm install -g create-react-app •$ create-react-app { project name } •$ cd { project name } •$ npm start •※Babel •ECMAscript2015Ҏ߱ͷ΋ͷΛϒϥ΢βʔͰಈ͘΋ͷʹτϥϯεύΠϧ

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JSΛॻ͘

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index.js ReactͰߏஙͨ͠Ծ૝తͳDOMπϦʔΛ
 DOMʹϨϯμϦϯά͍ͯ͠Δ

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App.js JSX

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JSX •React.createElement()ͷ౶ҥߏจ •

ͳͲɺHTMLϥΠΫͳXMLͰهड़ •classଐੑ͕classNameʹͳͬͨΓ •CSSΛJSΦϒδΣΫτͰॻ͍ͨΓ •React.render()ͱ͍͏Lifecycle MethodʹΑΓ
 มߋ͕React-DOMʹ௨஌ɺϨϯμϦϯά͞ΕΔ

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App.js JSX

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App.js ίϯϙʔωϯτ

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ίϯϙʔωϯτπϦʔ ίϯϙʔωϯτͷπϦʔΛDOMʹϨϯμϦϯά

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ίϯϙʔωϯτͱProps ଐੑΛܦ༝ͯ͠
 ஋ΛPropsͱͯ͠౉͢͜ͱ͕Ͱ͖Δ Props Props Props Props

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State ʮDOM͸Stateͷ ࣸ૾Ͱ͋Δʯ

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Stateͷมߋ stateͷมߋ͸setState()
 ϝιουܦ༝ͰͷΈՄೳ

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Lifecycle Method •Componentʹ͸ଟ͘ͷLifecycle Method͕ੜ͍͑ͯΔ •Ұ౓ϨϯμϦϯά͞ΕΔͱɺ
 setState΍৽ͨͳProps͕਌͔ΒΘ ͨ͞ΕΔͳͲʹΑͬͯ
 දࣔ͢΂͖஋͕มߋͨ࣌͠
 ͳͲʹ͜ΕΒͷϝιου͕ൃՐ͢Δ cf: https://tylermcginnis.com/an-introduction-to-life-cycle- events-in-react-js/

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Lifecycle Method cf: http://glassonion.hatenablog.com/entry/20120405/1333611664 cf: http://glassonion.hatenablog.com/entry/20120405/1333611664

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Lifecycle Method •componentWillMount •ίϯϙʔωϯτ͕DOMπϦʔʹ௥Ճ͞ΕΔ௚લʹ1౓͚ͩݺ͹ΕΔ •ॳճඳը௚લͷfetchAPIͷϦΫΤετ͸ͪ͜Β •componentDidMount •ίϯϙʔωϯτ͕DOMπϦʔʹ௥Ճ͞Εͨ௚ޙʹ1౓͚ͩݺ͹ΕΔ •componentWillUpdate •props΍state͕มߋ͞ΕDOMπϦʔʹ൓ө͞ΕΔ௚લʹຖճݺ͹ΕΔ •componentDidUpdate •props΍state͕มߋ͞ΕDOMπϦʔʹ൓ө͞Εͨ௚ޙʹຖճݺ͹ΕΔ •ଞʹ΋༻్Ԡͯ͡LifecycleϝιουΛ࢖͏͜ͱ͕Ͱ͖Δ •ύϑΥʔϚϯενϡʔχϯάͷͨΊͷ
 shouldComponentUpdate •props͕৽͘͠มΘΔ࣌ʹΞφ΢ϯεతʹ͔ͭ͏ •componentWillRecieveProps

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Lifecycle Method

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ॳΊ·ͯ͠ͷޙʹ •Webpack, Babel •https://webpack.js.org/ •https://babeljs.io •࠷৽ͷ࢓༷ͰJSΛ͔͍ͯϒϥ΢βʹରԠͤ͞Δ •Ұ౓webpack.config.jsΛ͔͍ͯݟΔͱྑ͍͔΋ •TypeScript or FlowType •https://www.typescriptlang.org/ •https://flow.org/ •JavaScriptʹ͸ͳ͍ܕఆٛΛར༻Մೳ •React-router •https://reacttraining.com/react-router/ •SPAͷ୉ޣຯɺϋογϡΠϕϯτʹΑΓݟͨ໨Λมߋv4Ͱͷഁյతมߋʹ஫ҙ •Redux •http://redux.js.org/ •େن໛ͳstate؅ཧΛ͢ΔͷʹσʔλͷྲྀΕΛ1ຊԽɺ·ͣ͸middlewareͳ͠Ͱ •Immutable.js •https://facebook.github.io/immutable-js/ •Reactͱ਌࿨ੑͷߴ͍ؔ਺ϥΠϒϥϦ

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·ͱΊ •React͸UIϥΠϒϥϦͰ͋Γɺ
 ఏڙ͞Ε͍ͯΔAPI͸͞΄Ͳଟ͘ͳ͍ •Ұ౓֮͑Δͱٸʹָ͘͠ͳΔ •·ͣখ͘͞ॻ͍ͯΈΔʂSPA͚͕ͩReact׆༻ ͡Όͳ͍ʂ •ٯʹݴ͏ͱଞͷϥΠϒϥϦͷબఆ͕ඞཁ •͜ͷ࿈ٳʹ৮ͬͯΈͯ͸͍͔͕Ͱ͠ΐ͏͔ʁ

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એ఻ •https://shiganai.org •OSCA͞Μ΋ग़ԋ͞Ε͍ͯ·͢ •sp.6aʲήετ: OSCAʳָ͍͠SIerͷ৽OSରԠ •sp.6bʲήετ: OSCAʳָ͍͠ຊ൪؀ڥϖΞϦϦʔε