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useImperativeHandle を迷いながら使った話
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kamiyam
October 04, 2024
Programming
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useImperativeHandle を迷いながら使った話
React Osaka 2024 10
kamiyam
October 04, 2024
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Transcript
useImperativeHandle Λ໎͍ͳ͕Βͬͨ React Osaka 2024 10 2024.10.4 @kamiyam
ࣗݾհ ͔ΈΜ (X@kamiyam) ݩࣗಈंඋ࢜ METEORWORKS Inc. Engineer ϑϩϯτʙ όοΫΤϯυ JavaScript/Node.js
શൠ
useImperativeHandle
useImperativeHandleΛ(༷తʹ)໎͍ͳ͕Β ͓ͬͨ
ࣄͷى͜Γ
form Λ·ͱΊͨίϯϙʔωϯτΛ࣮
detailValues ͷΛϦηοτ(ॳظʹ͢)Λ࣮͍ͨ͠ ͱ͍͏ཁ͕ग़ͨ ͦͯ͠ϦηοτΛ੍ޚ͢Δཁૉ֎෦ʹଘࡏ͢Δ
DetailForm ͷ֎෦͔ΒϦηοτॲཧΛߦ͏ ͱ͍͏࣮͕ඞཁ
detailValues ʹͨ͠ॳظΛmemo͓͍ͯͯ͠ Ϧηοτ࣮ߦ࣌ʹpropsΛ࠶͢? ͘͠isInitial Έ͍ͨͳϑϥάΛpropsͰ͢?
VTF*NQFSBUJWF)BOEMF VTF*NQFSBUJWF)BOEMFɺSFGͱͯ͠ެ։͞ΕΔϋϯυϧΛ ΧελϚΠζ͢ΔͨΊͷ3FBDUϑοΫͰ͢ɻ IUUQTSFBDUEFWSFGFSFODFSFBDUVTF*NQFSBUJWF)BOEMF
IUUQTSFBDUEFWSFGFSFODFSFBDUVTF*NQFSBUJWF)BOEMF
None
None
None
None
࣮ʹ͍ͭͯ https://ja.react.dev/reference/react/useImperativeHandle Λݩʹղઆ͠·͢
ͭ·Γ ref Λ௨ͯ͡ίϯϙʔωϯτʹ ॲཧΛੜ͢͜ͱ͕Ͱ͖Δɻͱ͍͏͜ͱ
ར༻ऀͱͯ͠ΊͪΌศར͕ͩ props(ม)Λ༻͍ͯৼΔ͍͕มΘΔͷ͕ ຊདྷͷܗͳͷͰ?
https://ja.react.dev/reference/react/useImperativeHandle
https://react.dev/reference/react/useImperativeHandle
“ྫ͑ɺModal ίϯϙʔωϯτ͔Β { open, close } ͷΑ͏ͳ໋ྩ ܕͷϋϯυϧΛެ։͢ΔͷͰͳ͘ɺ<Modal isOpen={isOpen} />
ͷΑ͏ʹɺisOpen Λ props ͱͯ͠ड͚औΔํ͕ྑ͍Ͱ͠ΐ͏ɻ ໋ྩܕͷಈ࡞Λ props ͱͯ͠ެ։͢ΔࡍʹΤϑΣΫτཱ͕ͪ ·͢ɻ”
IUUQTSFBDUEFWMFBSOTZODISPOJ[JOHXJUIF ff FDUT
ΤϑΣΫτͷ߲Ͱ props isPlaying:boolean ʹΑͬͯৼΔ͍͕มΘ͍ͬͯΔ
ͳΔ΄ͲΘ͔ΒΜ…🤦
ܾఆతͳ͑Λ୳ͯ͠·࣮ͨ͢ΔʑͳͷͰ͋ͬͨ…
͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠
Refs. useImperativeHandle https://react.dev/reference/react/useImperativeHandle Synchronizing with Effects https://react.dev/learn/synchronizing-with-effects