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How to control loading state in React
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Takumi Ohashi
December 06, 2018
Technology
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190
How to control loading state in React
Meguro.es #18
Takumi Ohashi
December 06, 2018
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Transcript
3FBDUͰ ϩʔσΟϯάΛ Ͳ͏ѻ͏͔ @_tohashi
ൃද͢Δਓ • Takumi Ohashi • @_tohashi • freee
࿑ಇڥ • ϞϊϦγοΫͳRailsΞϓϦέʔγϣϯ • ςʔϒϧ 600ڧ • js 40ສߦऑ •
React, flux, flowtype
࣏҆ҡ࣋ • ਓίʔυଟ͍ • ESLint, Prettier • ੩తʹղੳͰ͖ͳ͍ͷ • ίϯϙʔωϯτσʔλϑϩʔͷ࣮ํ
• ׂͷཻ, SFC • HOC, render props • ঢ়ଶཧ
ίϯϙʔωϯτͷঢ়ଶཧ • Ͳ͜Ͱཧ͖͔͢ • ϑΥʔϜͷೖྗ • μΠΞϩάͷ։ด • ඇಉظॲཧதͷεϐφʔදࣔ •
ઃܭ࣮ͷํ͔Ε͕ͪ • υΩϡϝϯταϯϓϧʹΑͬͯҧ͏
Redux ͷ FAQ
ίϯϙʔωϯτͷঢ়ଶཧ • ཁదٓஅ • ΞϓϦέʔγϣϯͷنɺཁ݅ɺར༻͢Δϥ ΠϒϥϦʹΑΔ • ҉ʹͳΓ͕ͪ • νʔϜ։ൃͳΒࢦͷ౷Ұඞཁ
ϩʔσΟϯά • APIϦΫΤετதʹεϐφʔΛදࣔͨ͠Γɺଞ ͷૢ࡞ΛϒϩοΫͨ͠Γ • ίϯϙʔωϯτͷঢ়ଶͰ͋Δ͕ඇಉظॲཧ ActionCreator ଆͰߦΘΕΔ
ϩʔσΟϯάͷ ࣮όϦΤʔγϣϯ
ίϯϙʔωϯτͰ݁
ίϯϙʔωϯτͰ݁ • ϚϯτޙʹҰ͚ͩAPIϦΫΤετΛૹ ΓɺͦͷϨεϙϯεͷϖΠϩʔυΛͬͯί ϯςϯπΛඳը • ϛχϚϜͳ React ΞϓϦέʔγϣϯ
ίϯϙʔωϯτͰ݁
ίϯϙʔωϯτͰ݁
ίϯϙʔωϯτͰ݁ ʢෳճͷϦΫΤετʣ • ϢʔβʔͷΞΫγϣϯʹԠͯ͡ෳճϦΫΤ ετΛૹΔ • ϖʔδωʔγϣϯͳͲ
ίϯϙʔωϯτͰ݁ ʢෳճͷϦΫΤετʣ • v
ίϯϙʔωϯτͰ݁ ʢෳճͷϦΫΤετʣ
Store ͷ State ͱͯ͠ཧ
Store ͷ Stateͱͯ͠ཧ • w/Redux • ϩʔσΟϯάͷঢ়ଶ Store ͷ State
ͱͯ͠ѻ ͏ • ίϯϙʔωϯτΛ presentational ʹͰ͖Δ
Store ͷ Stateͱͯ͠ཧ
Store ͷ Stateͱͯ͠ཧ
ϦετϏϡʔ • ϦετʹෳͷΞΠςϜ • ΞΠςϜ୯ҐͰฤूͯ͠ߋ৽ • ΞΠςϜ͝ͱʹϩʔσΟϯάͷঢ়ଶΛ࣋ͭ
ϦετϏϡʔ
ϦετϏϡʔ
ϦετϏϡʔ
ϩʔσΟϯάྃޙͷΞΫγϣϯ • ʮอଘ͠·ͨ͠ʯͳͲͷϝοηʔδ Notification ͷදࣔ • ϩʔσΟϯά͕ྃͨ͠ޙͷҰճ͚ͩൃੜ͞ ͍ͤͨ • ࣌ؒܦաϢʔβʔͷΞΫγϣϯͰফ͑Δ
ϩʔσΟϯάྃޙͷΞΫγϣϯ
ϩʔσΟϯάྃޙͷΞΫγϣϯ
ΑΓେنͳΞϓϦέʔγϣϯ • ReducerͷංେԽ • API͝ͱʹREQUEST, SUCCESS, (FAILED) • LoadingReducerͳͲʹׂ •
LoadingStateͷόέπϦϨʔ • Context API
ίϯϙʔωϯτͷ State ͱͯ͠ཧ
ίϯϙʔωϯτͷ Stateͱͯ͠ ཧ • Store ͷ State άϩʔόϧ • ϩʔσΟϯάίϯϙʔωϯτͷঢ়ଶͱͯ͠
͍݁ͤͨ͞ • ͔ͭ Redux ͷσʔλϑϩʔͱΈ߹ΘͤΔ
ίϯϙʔωϯτͷ State ͱͯ͠ ཧ
ίϯϙʔωϯτͷ State ͱͯ͠ ཧ
ίϯϙʔωϯτͷ State ͱͯ͠ ཧ
Suspense
Suspense • ϞδϡʔϧͷԆϩʔυඇಉظॲཧ͕ྃ ͢Δ·ͰϨϯμϦϯάΛ suspend Ͱ͖Δ • ϞδϡʔϧͷԆϩʔυ v16.6 ͔Β
• ඇಉظॲཧ mid 2019 ·Ͱʹʢ༧ఆʣ
Suspense
Suspense
Suspense • ۜͷؙͰͳ͍ • Ϧιʔεͷߋ৽ͳͲσʔλϑΣονҎ֎ͷॲཧ ैདྷ௨Γ͍ͬͯ͘ඞཁ͕͋Δ • ΩϟογϡཧϛεΔͱ͍ • ࠷ѱϨϯμϦϯάຖʹ
API ϦΫΤετ͕ඈͿ
͓ΘΓʹ • ϩʔσΟϯάҰͭͱ࣮ͬͯํ๏༷ʑ • ࣗ Store ͷ State ->
ਏ͘ͳͬͯίϯϙʔωϯτͷ State ʹ • ίϯϙʔωϯτͷ async Λڐ༰Ͱ͖Δ͔Ͳ͏͔ • ࣮ࡍ͜͜ʹΤϥʔϋϯυϦϯάೖͬͯ͘Δ • ࠷ڧͷϩʔσΟϯάঢ়ଶཧΛߟ͍͖͑ͯ·͠ΐ͏