{"id":1141,"date":"2024-05-16T20:49:25","date_gmt":"2024-05-16T11:49:25","guid":{"rendered":"https:\/\/shinke1987.net\/?p=1141"},"modified":"2025-07-05T23:10:10","modified_gmt":"2025-07-05T14:10:10","slug":"react%ef%bc%9auselayouteffect-%e3%81%a8-useeffect-%e3%81%ae%e5%8b%95%e4%bd%9c%e7%a2%ba%e8%aa%8d","status":"publish","type":"post","link":"https:\/\/shinke1987.net\/?p=1141","title":{"rendered":"React\uff1auseLayoutEffect \u3068 useEffect \u306e\u52d5\u4f5c\u78ba\u8a8d"},"content":{"rendered":"\n

\u74b0\u5883<\/h2>\n\n\n\n

React\uff1av18.3.1<\/p>\n\n\n\n

Tips<\/h2>\n\n\n\n

\u958b\u767a\u74b0\u5883\u3067 useLayoutEffect \u3068 useEffect \u304c2\u56de\u5b9f\u884c\u3055\u308c\u308b\u306e\u3092\u9632\u3050\u306b\u306f\u3001
main.tsx \u306e <React.StrictMode> \u306e\u30bf\u30b0\u3092\u30b3\u30e1\u30f3\u30c8\u30a2\u30a6\u30c8\u3059\u308c\u3070\u826f\u3044\u3002<\/p>\n\n\n\n

\u5b9f\u884c\u3055\u308c\u308b\u9806\u756a\u3092\u78ba\u8a8d<\/h2>\n\n\n\n

\u518d\u63cf\u753b\u6642\u306b\u5e38\u306b\u5b9f\u884c\u3055\u308c\u308b\u5834\u5408<\/h3>\n\n\n\n

App.tsx\u306e\u5185\u5bb9<\/h4>\n\n\n
\nimport { ReactNode, useEffect, useLayoutEffect } from 'react';\nimport Parent from '.\/Parent.tsx';\n\nfunction App(): ReactNode {\n  useLayoutEffect(() => {\n    console.log('App useLayoutEffect');\n  });\n\n  useEffect(() => {\n    console.log('App useEffect');\n  });\n\n  return (\n    <>\n      \u3042\u3044\u3046\u3048\u304a\n      <Parent \/>\n    <\/>\n  );\n}\n\nexport default App;\n<\/pre><\/div>\n\n\n
Parent.tsx\u306e\u5185\u5bb9<\/h4>\n\n\n
\nimport {\n  ReactNode, useEffect, useLayoutEffect, useState,\n} from 'react';\nimport Child1 from '.\/Child1.tsx';\n\nfunction Parent(): ReactNode {\n  const [child1Value, setChild1Value] = useState<string>('Child1\u306e\u521d\u671f\u5024');\n  const [parentValue1, setParentValue1] = useState<string>('Parent\u306e\u521d\u671f\u5024');\n\n  function parentBtnClickFunc() {\n    alert('parentBtnClickFunc');\n    setChild1Value('\u89aa\u304b\u3089State\u304c\u5909\u66f4\u3055\u308c\u307e\u3057\u305f');\n  }\n\n  useLayoutEffect(() => {\n    console.log('Parent useLayoutEffect');\n  });\n\n  useEffect(() => {\n    console.log('Parent useEffect');\n  });\n\n  return (\n    <>\n      <div>\n        \u89aa\uff1a\n        {parentValue1}\n      <\/div>\n      <button type="button" onClick={parentBtnClickFunc}>\n        \u89aa\u30dc\u30bf\u30f3\n      <\/button>\n      <Child1 childProp={child1Value} parentStateFunc={setParentValue1} \/>\n    <\/>\n  );\n}\n\nexport default Parent;\n<\/pre><\/div>\n\n\n
Child1.tsx\u306e\u5185\u5bb9<\/h4>\n\n\n
\nimport { ReactNode, useEffect, useLayoutEffect } from 'react';\n\ntype Child1Props = {\n  childProp: string,\n  parentStateFunc: Function\n};\n\nfunction Child1({ childProp, parentStateFunc }: Child1Props): ReactNode {\n  function childBtnClickFunc(): void {\n    alert('childBtnClickFunc');\n    parentStateFunc('\u5b50\u304b\u3089State\u304c\u5909\u66f4\u3055\u308c\u307e\u3057\u305f');\n  }\n\n  useLayoutEffect(() => {\n    console.log('Child1 useLayoutEffect');\n  });\n\n  useEffect(() => {\n    console.log('Child1 useEffect');\n  });\n\n  return (\n    <>\n      <div>\n        \u5b50\uff1a\n        {childProp}\n      <\/div>\n      <button type="button" onClick={childBtnClickFunc}>\n        \u5b50\u30dc\u30bf\u30f3\n      <\/button>\n    <\/>\n  );\n}\n\nexport default Child1;\n<\/pre><\/div>\n\n\n
\u7d50\u679c\uff08\u30b3\u30f3\u30bd\u30fc\u30eb\u306e\u8868\u793a\u5185\u5bb9\uff09<\/h4>\n\n\n
\n\/\/ \u30da\u30fc\u30b8\u8868\u793a\u5f8c\u3002\nChild1 useLayoutEffect\nParent useLayoutEffect\nApp useLayoutEffect\nChild1 useEffect\nParent useEffect\nApp useEffect\n\n\/\/ \u89aa\u30dc\u30bf\u30f3\u3092\u62bc\u4e0b\u3057\u3001\u5b50\u306eProp\uff08\u89aa\u306eState\uff09\u3092\u66f4\u65b0\u5f8c\u3002\nChild1 useLayoutEffect\nParent useLayoutEffect\nChild1 useEffect\nParent useEffect\n\n\/\/ \u5b50\u30dc\u30bf\u30f3\u3092\u62bc\u4e0b\u3057\u3001\u89aa\u306eState\u3092\u66f4\u65b0\u5f8c\u3002\nChild1 useLayoutEffect\nParent useLayoutEffect\nChild1 useEffect\nParent useEffect\n<\/pre><\/div>\n\n\n
\u521d\u671f\u63cf\u753b\u6642\u306b\u306e\u307f\u5b9f\u884c\u3055\u308c\u308b\u5834\u5408<\/h3>\n\n\n\n
App.tsx\u306e\u5185\u5bb9<\/h4>\n\n\n
\nimport { ReactNode, useEffect, useLayoutEffect } from 'react';\nimport Parent from '.\/Parent.tsx';\n\nfunction App(): ReactNode {\n  useLayoutEffect(() => {\n    console.log('App useLayoutEffect');\n  }, []);\n\n  useEffect(() => {\n    console.log('App useEffect');\n  }, []);\n\n  return (\n    <>\n      \u3042\u3044\u3046\u3048\u304a\n      <Parent \/>\n    <\/>\n  );\n}\n\nexport default App;\n<\/pre><\/div>\n\n\n
Parent.tsx\u306e\u5185\u5bb9<\/h4>\n\n\n
\nimport {\n  ReactNode, useEffect, useLayoutEffect, useState,\n} from 'react';\nimport Child1 from '.\/Child1.tsx';\n\nfunction Parent(): ReactNode {\n  const [child1Value, setChild1Value] = useState<string>('Child1\u306e\u521d\u671f\u5024');\n  const [parentValue1, setParentValue1] = useState<string>('Parent\u306e\u521d\u671f\u5024');\n\n  function parentBtnClickFunc() {\n    alert('parentBtnClickFunc');\n    setChild1Value('\u89aa\u304b\u3089State\u304c\u5909\u66f4\u3055\u308c\u307e\u3057\u305f');\n  }\n\n  useLayoutEffect(() => {\n    console.log('Parent useLayoutEffect');\n  }, []);\n\n  useEffect(() => {\n    console.log('Parent useEffect');\n  }, []);\n\n  return (\n    <>\n      <div>\n        \u89aa\uff1a\n        {parentValue1}\n      <\/div>\n      <button type="button" onClick={parentBtnClickFunc}>\n        \u89aa\u30dc\u30bf\u30f3\n      <\/button>\n      <Child1 childProp={child1Value} parentStateFunc={setParentValue1} \/>\n    <\/>\n  );\n}\n\nexport default Parent;\n<\/pre><\/div>\n\n\n
Child1.tsx\u306e\u5185\u5bb9<\/h4>\n\n\n
\nimport { ReactNode, useEffect, useLayoutEffect } from 'react';\n\ntype Child1Props = {\n  childProp: string,\n  parentStateFunc: Function\n};\n\nfunction Child1({ childProp, parentStateFunc }: Child1Props): ReactNode {\n  function childBtnClickFunc(): void {\n    alert('childBtnClickFunc');\n    parentStateFunc('\u5b50\u304b\u3089State\u304c\u5909\u66f4\u3055\u308c\u307e\u3057\u305f');\n  }\n\n  useLayoutEffect(() => {\n    console.log('Child1 useLayoutEffect');\n  }, []);\n\n  useEffect(() => {\n    console.log('Child1 useEffect');\n  }, []);\n\n  return (\n    <>\n      <div>\n        \u5b50\uff1a\n        {childProp}\n      <\/div>\n      <button type="button" onClick={childBtnClickFunc}>\n        \u5b50\u30dc\u30bf\u30f3\n      <\/button>\n    <\/>\n  );\n}\n\nexport default Child1;\n<\/pre><\/div>\n\n\n
\u7d50\u679c\uff08\u30b3\u30f3\u30bd\u30fc\u30eb\u306e\u8868\u793a\u5185\u5bb9\uff09<\/h4>\n\n\n
\n\/\/ \u30da\u30fc\u30b8\u8868\u793a\u5f8c\u3002\nChild1 useLayoutEffect\nParent useLayoutEffect\nApp useLayoutEffect\nChild1 useEffect\nParent useEffect\nApp useEffect\n\n\/\/ \u89aa\u30dc\u30bf\u30f3\u3092\u62bc\u4e0b\u3057\u3001\u5b50\u306eProp\uff08\u89aa\u306eState\uff09\u3092\u66f4\u65b0\u5f8c\u3002\n\u203b \u8ffd\u52a0\u3067\u8868\u793a\u3055\u308c\u306a\u3044\u3002\n\n\/\/ \u5b50\u30dc\u30bf\u30f3\u3092\u62bc\u4e0b\u3057\u3001\u89aa\u306eState\u3092\u66f4\u65b0\u5f8c\u3002\n\u203b \u8ffd\u52a0\u3067\u8868\u793a\u3055\u308c\u306a\u3044\u3002\n<\/pre><\/div>\n\n\n
\u7279\u5b9a\u306eState\u304c\u66f4\u65b0\u3055\u308c\u305f\u6642\u306b\u5b9f\u884c\u3055\u308c\u308b\u5834\u5408<\/h3>\n\n\n\n
App.tsx\u306e\u5185\u5bb9<\/h4>\n\n\n
\nimport { ReactNode, useEffect, useLayoutEffect } from 'react';\nimport Parent from '.\/Parent.tsx';\n\nfunction App(): ReactNode {\n  useLayoutEffect(() => {\n    console.log('App useLayoutEffect');\n  }, []);\n\n  useEffect(() => {\n    console.log('App useEffect');\n  }, []);\n\n  return (\n    <>\n      \u3042\u3044\u3046\u3048\u304a\n      <Parent \/>\n    <\/>\n  );\n}\n\nexport default App;\n<\/pre><\/div>\n\n\n
Parent.tsx\u306e\u5185\u5bb9<\/h4>\n\n\n
\nimport {\n  ReactNode, useEffect, useLayoutEffect, useState,\n} from 'react';\nimport Child1 from '.\/Child1.tsx';\n\nfunction Parent(): ReactNode {\n  const [child1Value, setChild1Value] = useState<string>('Child1\u306e\u521d\u671f\u5024');\n  const [parentValue1, setParentValue1] = useState<string>('Parent\u306e\u521d\u671f\u5024');\n\n  function parentBtnClickFunc() {\n    alert('parentBtnClickFunc');\n    setChild1Value('\u89aa\u304b\u3089State\u304c\u5909\u66f4\u3055\u308c\u307e\u3057\u305f');\n  }\n\n  useLayoutEffect(() => {\n    console.log('Parent useLayoutEffect');\n  }, [parentValue1]);\n\n  useEffect(() => {\n    console.log('Parent useEffect');\n  }, [parentValue1]);\n\n  return (\n    <>\n      <div>\n        \u89aa\uff1a\n        {parentValue1}\n      <\/div>\n      <button type="button" onClick={parentBtnClickFunc}>\n        \u89aa\u30dc\u30bf\u30f3\n      <\/button>\n      <Child1 childProp={child1Value} parentStateFunc={setParentValue1} \/>\n    <\/>\n  );\n}\n\nexport default Parent;\n<\/pre><\/div>\n\n\n
Child1.tsx\u306e\u5185\u5bb9<\/h4>\n\n\n
\nimport { ReactNode, useEffect, useLayoutEffect } from 'react';\n\ntype Child1Props = {\n  childProp: string,\n  parentStateFunc: Function\n};\n\nfunction Child1({ childProp, parentStateFunc }: Child1Props): ReactNode {\n  function childBtnClickFunc(): void {\n    alert('childBtnClickFunc');\n    parentStateFunc('\u5b50\u304b\u3089State\u304c\u5909\u66f4\u3055\u308c\u307e\u3057\u305f');\n  }\n\n  useLayoutEffect(() => {\n    console.log('Child1 useLayoutEffect');\n  }, [childProp]);\n\n  useEffect(() => {\n    console.log('Child1 useEffect');\n  }, [childProp]);\n\n  return (\n    <>\n      <div>\n        \u5b50\uff1a\n        {childProp}\n      <\/div>\n      <button type="button" onClick={childBtnClickFunc}>\n        \u5b50\u30dc\u30bf\u30f3\n      <\/button>\n    <\/>\n  );\n}\n\nexport default Child1;\n<\/pre><\/div>\n\n\n
\u7d50\u679c\uff08\u30b3\u30f3\u30bd\u30fc\u30eb\u306e\u8868\u793a\u5185\u5bb9\uff09<\/h4>\n\n\n
\n\/\/ \u30da\u30fc\u30b8\u8868\u793a\u5f8c\u3002\nChild1 useLayoutEffect\nParent useLayoutEffect\nApp useLayoutEffect\nChild1 useEffect\nParent useEffect\nApp useEffect\n\n\/\/ \u89aa\u30dc\u30bf\u30f3\u3092\u62bc\u4e0b\u3057\u3001\u5b50\u306eProp\uff08\u89aa\u306eState\uff09\u3092\u66f4\u65b0\u5f8c\u3002\nChild1 useLayoutEffect\nChild1 useEffect\n\n\/\/ \u5b50\u30dc\u30bf\u30f3\u3092\u62bc\u4e0b\u3057\u3001\u89aa\u306eState\u3092\u66f4\u65b0\u5f8c\u3002\nParent useLayoutEffect\nParent useEffect\n<\/pre><\/div>\n\n\n
useEffect \u3067 fetch \u3057\u3066State\u66f4\u65b0<\/h2>\n\n\n\n
Child1.tsx\u306e\u5185\u5bb9<\/h3>\n\n\n
\nimport { ReactNode, useEffect, useLayoutEffect } from 'react';\n\ntype Child1Props = {\n  childProp: string,\n  parentStateFunc: Function\n};\n\nfunction Child1({ childProp, parentStateFunc }: Child1Props): ReactNode {\n  const [showText, setShowText] = useState('\u521d\u671f\u5024');\n\n  const fetchData = async () => {\n    const response = await fetch('http:\/\/localhost:3001');\n    const data = await response.text();\n    return data;\n  };\n\n  useEffect(() => {\n    fetchData().then((text:string) => {\n      setShowText(text);\n    });\n  }, []);\n\n  return (\n    <>\n      <div>\n        \u5b50\uff1a\n        {childProp}\n      <\/div>\n      <div>\n        {showText}\n      <\/div>\n    <\/>\n  );\n}\n\nexport default Child1;\n<\/pre><\/div>","protected":false},"excerpt":{"rendered":"
\u74b0\u5883 React\uff1av18.3.1 Tips \u958b\u767a\u74b0\u5883\u3067 useLayoutEffect \u3068 useEffect \u304c2\u56de\u5b9f\u884c\u3055\u308c\u308b\u306e\u3092\u9632\u3050\u306b\u306f\u3001main.tsx \u306e <React.StrictMode> \u306e\u30bf\u30b0 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[104],"tags":[105],"class_list":["post-1141","post","type-post","status-publish","format-standard","hentry","category-react","tag-react"],"_links":{"self":[{"href":"https:\/\/shinke1987.net\/index.php?rest_route=\/wp\/v2\/posts\/1141","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/shinke1987.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/shinke1987.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/shinke1987.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/shinke1987.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1141"}],"version-history":[{"count":5,"href":"https:\/\/shinke1987.net\/index.php?rest_route=\/wp\/v2\/posts\/1141\/revisions"}],"predecessor-version":[{"id":1324,"href":"https:\/\/shinke1987.net\/index.php?rest_route=\/wp\/v2\/posts\/1141\/revisions\/1324"}],"wp:attachment":[{"href":"https:\/\/shinke1987.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1141"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/shinke1987.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1141"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/shinke1987.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1141"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}