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Vue.jsを数ヶ月使ってみて遭遇した問題とその解決策
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positiveflat
May 27, 2015
Programming
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4.4k
Vue.jsを数ヶ月使ってみて遭遇した問題とその解決策
Data Binding JS Night 〜データバインディングなんでもLT大会@LINEオフィス〜
positiveflat
May 27, 2015
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Transcript
Vue.jsΛϲ݄ͬͯΈͯૺ۰ͨ͠ͱͦͷղܾࡦ Data Binding JS Night ʙσʔλόΠϯσΟϯάͳΜͰLTେձ@LINEΦϑΟεʙ גࣜձࣾϓϨΠυ Yohei Noda @positiveflat
2015/05/27 https://plaid.co.jp/
ࣗݾհ ໊લ: Yohei Noda ॴଐ: גࣜձࣾϓϨΠυ twitter: @positiveflat 201412݄ʹIBMΛୀ৬ 20151݄ΑΓגࣜձࣾϓϨΠυʹjoin
ϦΞϧλΠϜWeb٬πʔϧ ͷ։ൃʢओʹϑϩϯτΤ ϯυʣ
͡Ίʹ…Vue.jsͷ؆୯ͳհ • ΠϯλϥΫςΟϒwebΠϯλʔϑΣʔεΛߏங͢ΔͨΊͷMVVM(Model, View, ViewModel) ΫϥΠΞϯτϑϨʔϜϫʔΫ • ํσʔλόΠϯσΟϯά • σΟϨΫςΟϒͱͯ͠ɺDOMͷॲཧΛΧελϚΠζͯ͠ఏڙͰ͖Δɻ
• σʔλͷఆٛDOMͷߏஙͳͲΛ·ͱΊͯɺͦͷ෦Λίϯϙʔωϯτͱͯ͠࡞ ͢Δ͜ͱ͕Ͱ͖Δɻ • ܰྔ • γϯϓϧͰֶशίετ͕͍ • ͨͩ͠…ES5४ڌͷϒϥβαϙʔτΛલఏͱ͍ͯ͠ΔͷͰɺIE8αϙʔτ֎
͡Ίʹ…Vue.jsͷ؆୯ͳհ • el • data • compiled • ready •
methods …
͡Ίʹ…Vue.jsͷ؆୯ͳհ HTML {{hoge}}ͷΑ͏ͳه๏Ͱ $data ҎԼͷϓϩύςΟʹΞΫηεՄೳ
ʮγϯϓϧͰ৭ʑ؆୯ʹ࡞Εָͯͦ͠͏ɻʯ Vue.jsͷ࠷ॳͷҹ
͔֬ʹͦ͏Ͱ͕ͨ͠ɺ ࡉ͔͍ʹͿ͔ͭΓ·ͨ͠ɻ
1. $dataʹΛͯ͠มߋ͕ݕ͞Εͳ͍ HTML JavaScript
1. $dataʹΛͯ͠มߋ͕ݕ͞Εͳ͍ [ղܾࡦ] $add, $delete (, $set)Λ͏ …ͪΌΜͱdocumentΛಡΜͰ͍ͳ͍ͱͿ͔ͭΔɻ “Due
to the limitations of ES5, Vue cannot detect properties directly added to or deleted from an Object, so use this method and vm.$delete when you need to do so.”
1. $dataʹΛͯ͠มߋ͕ݕ͞Εͳ͍ [ৄࡉ] Vue.js 0.11.*ECMAScript 5४ڌͷϒϥβΛαϙʔτ͍ͯ͠ΔͷͰɺObject ʹ͕Ճ͞Εͯݕ͞Εͳ͍ɻ௨ৗ$dataͷԼͷϓϩύςΟʹgetter/ setterΛ༩͍ͯͦ͠ΕΛVue͕ࢹ͍ͯ͠Δ͕ɺΛՃ͢Δͱ༩͞ Εͳ͍ɻ͜ͷ੍͕ͳ͘ͳΔͱɺObject.observe()ͱ͔͕͑ΔΑ͏ʹͳΔ͔ ?
# Object.observer()ɺมߋΛࢹͯ͠objectͷมߋཤྺΛอ࣋͢Δ͜ͱ͕Ͱ ͖Δ
2. $dataͷԼͷσʔλ͕େ͖͘ɾਂ͘ͳΔͱ ٸܹʹ͘ͳΔ [ৄࡉ] • 1ͷ܁Γฦ͕ͩ͠ɺVue.jsES5४ڌͷϒϥβΛαϙʔτ ͍ͯ͠ΔͨΊɺObject.observe()ΛΘͣʹɺgetter/setterΛࢹ ͍ͯ͠Δɻ • ෦తʹɺ$dataͷԼʹ͋ΔObjectͷgetter,
setterΛࢹͯ͠ __proto__ҎԼΛॻ͖͍͑ͯΔɻ • Αͬͯɺ$dataͷԼͷ͕มΘΔ͚ͩͰɺେྔͷ__proto__Λॻ͖ ͑Δ͜ͱʹͳΔͨΊ͘ͳΔɻ
2. $dataͷԼͷσʔλ͕େ͖͘ɾਂ͘ͳΔͱ ٸܹʹ͘ͳΔ ͱ͍͏͜ͱͰɺ $dataҎԼͰ͖Δ͚ͩܰͨ͘͠΄͏͕Αͦ͞͏ɻ
3. select optionͷtext͕؆୯ʹऔಘͰ͖ͳ͍ • JavaScript • html …valueͰͳ͘ɺtextͷ”ࠇ۠””ौ୩۠”Λද͍ࣔͨ͠
3. select optionͷtext͕؆୯ʹऔಘͰ͖ͳ͍ [ղܾࡦ] ؆୯ͳΞΫηεͷํ๏͕ͳ͍ͷͰɺ computedͰoptionsͷarrayͷத͔ΒஞҰݕࡧ͢Δ
4. selectͷdefault͕html͔ΒࢦఆͰ͖ͳ͍ HTML “selected”ଐੑΛ༩͢ΕΑ͔͕ͬͨɺɺ ༩Ͱ͖ͳ͍ʢoptions=“”Λ༻ͤͣʹoptionΛҰͭͣͭॻ͍ͨ߹ಉ༷ʣ
4. selectͷdefault͕html͔ΒࢦఆͰ͖ͳ͍ [ղܾࡦ] ؆୯ɻ୯७ʹɺv-modelͷʹॳظΛͨͤͯΕྑ͍
·ͱΊ • Vue.jsɺ࣮͕γϯϓϧͳׂʹ൚༻ੑ͕ߴ͍ɻ • ॳΊͷࠒʹͿ͔ͭͬͨຊհͨ͠Ґͷ͍ܰͷͰɺ׳Εͯ͠·͑ ॻ͖͍͢ɻ • ࣍ͷόʔδϣϯָ͕͠Έɻ
࠷ޙʹগ͠એ
גࣜձࣾϓϨΠυͰɺ ΤϯδχΞΛืूதͰ͢ʂ
Thank you! Yohei Noda @positiveflat