{"id":46010,"date":"2023-05-26T19:07:56","date_gmt":"2023-05-26T10:07:56","guid":{"rendered":"https:\/\/kinsta.com\/jp\/?p=46010&preview=true&preview_id=46010"},"modified":"2023-08-26T00:18:09","modified_gmt":"2023-08-25T15:18:09","slug":"react-conditional-render","status":"publish","type":"post","link":"https:\/\/kinsta.com\/jp\/blog\/react-conditional-render\/","title":{"rendered":"React\u306e\u6761\u4ef6\u4ed8\u304d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3092\u4f7f\u3044\u3053\u306a\u3059\uff08\u5fb9\u5e95\u89e3\u8aac\uff09"},"content":{"rendered":"

\u6761\u4ef6\u4ed8\u304d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u306fReact\u306e\u5f37\u529b\u306a\u6a5f\u80fd\u3067\u3059\u3002\u3053\u308c\u3092\u4f7f\u3063\u3066\u7279\u5b9a\u306e\u6761\u4ef6\u306b\u57fa\u3065\u3044\u3066\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n

\u52d5\u7684\u304b\u3064\u30a4\u30f3\u30bf\u30e9\u30af\u30c6\u30a3\u30d6\u306a\u30a6\u30a7\u30d6\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u69cb\u7bc9\u3059\u308b\u4e0a\u3067\u3001\u91cd\u8981\u306a\u5f79\u5272\u3092\u679c\u305f\u3059\u57fa\u672c\u7684\u306a\u6982\u5ff5\u3067\u3059\u3002<\/p>\n

\u4eca\u56de\u306e\u8a18\u4e8b\u3067\u306f\u3001React\u306e\u6761\u4ef6\u4ed8\u304d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u306b\u3064\u3044\u3066\u6df1\u304f\u6398\u308a\u4e0b\u3052\u3001\u57fa\u672c\u7684\u306a\u30c6\u30af\u30cb\u30c3\u30af\u3068\u9ad8\u5ea6\u306a\u30c6\u30af\u30cb\u30c3\u30af\u3092\u3001\u6b63\u3057\u3044\u7406\u89e3\u306e\u305f\u3081\u306e\u4f8b\u3068\u3068\u3082\u306b\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n

<\/div><\/kinsta-auto-toc>\n

React\u306e\u6761\u4ef6\u4ed8\u304d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0<\/h2>\n

React<\/a>\u306e\u6761\u4ef6\u4ed8\u304d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3067\u306f\u3001\u5909\u6570\u3001\u72b6\u614b\u3001\u307e\u305f\u306fprops\u306b\u683c\u7d0d\u3059\u308b\u7279\u5b9a\u306e\u5024\u306b\u57fa\u3065\u3044\u3066\u3001\u753b\u9762\u306b\u8868\u793a\u3055\u308c\u308b\u30b3\u30f3\u30c6\u30f3\u30c4\u3092\u52d5\u7684\u306b\u5236\u5fa1\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n

\u3053\u308c\u306f\u3001\u7279\u5b9a\u306eUI\u8981\u7d20\u3092\u8868\u793a\u307e\u305f\u306f\u975e\u8868\u793a\u306b\u3057\u305f\u308a\u3001\u30da\u30fc\u30b8\u306e\u30ec\u30a4\u30a2\u30a6\u30c8\u3092\u5909\u66f4\u3057\u305f\u308a\u3001\u30e6\u30fc\u30b6\u30fc\u306e\u64cd\u4f5c\u306b\u57fa\u3065\u3044\u3066\u5225\u306e\u30b3\u30f3\u30c6\u30f3\u30c4\u3092\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3057\u305f\u308a\u3059\u308b\u5834\u5408\u306b\u975e\u5e38\u306b\u4fbf\u5229\u3067\u3059\u3002<\/p>\n

\u6761\u4ef6\u4ed8\u304d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u306f\u3001React\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306b\u304a\u3044\u3066\u91cd\u8981\u3067\u3059\u3002\u3068\u3044\u3046\u306e\u3082\u3001\u5909\u5316\u3059\u308b\u30c7\u30fc\u30bf\u3084\u30e6\u30fc\u30b6\u30fc\u30a4\u30f3\u30bf\u30e9\u30af\u30b7\u30e7\u30f3\u306b\u30ea\u30a2\u30eb\u30bf\u30a4\u30e0\u3067\u5bfe\u5fdc\u3067\u304d\u308b\u3001\u52d5\u7684\u306a\u30e6\u30fc\u30b6\u30fc\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u304b\u3089\u3067\u3059\u3002<\/p>\n

\u307e\u305f\u3001\u4e0d\u8981\u306a\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3084\u8981\u7d20\u306e\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3092\u56de\u907f\u3059\u308b\u3053\u3068\u3067\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9<\/a>\u3068\u52b9\u7387\u3092\u5411\u4e0a\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n

\u6761\u4ef6\u4ed8\u304d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u306e\u57fa\u672c\u30c6\u30af\u30cb\u30c3\u30af<\/h2>\n

React\u3067\u6761\u4ef6\u4ed8\u304d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u306b\u4f7f\u7528\u3067\u304d\u308b\u57fa\u672c\u7684\u306a\u30c6\u30af\u30cb\u30c3\u30af\u3092\u3044\u304f\u3064\u304b\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n

\u6761\u4ef6\u4ed8\u304d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u306bif\u6587\u3092\u4f7f\u7528\u3059\u308b<\/h3>\n

React\u3067\u6761\u4ef6\u4ed8\u304d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3092\u5b9f\u88c5\u3059\u308b\u304a\u624b\u8efd\u306a\u65b9\u6cd5\u304c\u3001if<\/code>\u306e\u4f7f\u7528\u3067\u3059\u3002<\/p>\n

if<\/span> (<\/span>condition)<\/span> {<\/span>\n    return<\/span> <<\/span>p><\/span><\/span>Expression 1<\/span><\/<\/span>p><\/span><\/span>;<\/span>\n  }<\/span> else<\/span> {<\/span>\n    return<\/span> <<\/span>p><\/span><\/span>Expression 2<\/span><\/<\/span>p><\/span><\/span>;<\/span>\n  }<\/span><\/code><\/pre>\n
JavaScript\u306eif<\/code>\u6587\u306f\u3001\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306erender()<\/code>\u30e1\u30bd\u30c3\u30c9\u5185\u3067\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u7279\u5b9a\u306e\u6761\u4ef6\u306b\u57fa\u3065\u3044\u3066\u30b3\u30f3\u30c6\u30f3\u30c4\u3092\u6761\u4ef6\u4ed8\u304d\u3067\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u305f\u3068\u3048\u3070\u3001\u30c7\u30fc\u30bf\u306e\u8aad\u307f\u8fbc\u307f\u3092\u5f85\u3064\u9593\u306b\u30b9\u30d4\u30ca\u30fc\u3092\u8868\u793a\u3059\u308b\u306b\u306f\u3001\u6b21\u306e\u3088\u3046\u306aif\u6587\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n
import<\/span> {<\/span> useState,<\/span> useEffect }<\/span> from<\/span> 'react'<\/span>;<\/span>\nimport<\/span> Spinner from<\/span> '.\/Spinner'<\/span>;<\/span>\n\nconst<\/span> MyComponent<\/span> =<\/span> (<\/span>)<\/span> =><\/span> {<\/span>\n  const<\/span> [<\/span>isLoading,<\/span> setIsLoading]<\/span> =<\/span> useState<\/span>(<\/span>true<\/span>)<\/span>;<\/span>\n  const<\/span> [<\/span>data,<\/span> setData]<\/span> =<\/span> useState<\/span>(<\/span>null<\/span>)<\/span>;<\/span>\n\n  useEffect<\/span>(<\/span>(<\/span>)<\/span> =><\/span> {<\/span>\n    \/\/ Fetch data from an API<\/span>\n    fetch<\/span>(<\/span>'https:\/\/example.com\/data'<\/span>)<\/span>\n      .<\/span>then<\/span>(<\/span>(<\/span>response<\/span>)<\/span> =><\/span> response.<\/span>json<\/span>(<\/span>)<\/span>)<\/span>\n      .<\/span>then<\/span>(<\/span>(<\/span>data<\/span>)<\/span> =><\/span> {<\/span>\n        setData<\/span>(<\/span>data)<\/span>;<\/span>\n        setIsLoading<\/span>(<\/span>false<\/span>)<\/span>;<\/span>\n      }<\/span>)<\/span>;<\/span>\n  }<\/span>,<\/span> [<\/span>]<\/span>)<\/span>;<\/span>\n\n  if<\/span> (<\/span>isLoading)<\/span> {<\/span>\n    return<\/span> <<\/span>Spinner<\/span> \/><\/span><\/span>;<\/span>\n  }<\/span>\n\n  return<\/span> <<\/span>div><\/span><\/span>{<\/span>\/* Render the data here *\/<\/span>}<\/span><\/<\/span>div><\/span><\/span>;<\/span>\n}<\/span>;<\/span>\n\nexport<\/span> default<\/span> MyComponent;<\/span><\/code><\/pre>\n
\u3053\u306e\u4f8b\u3067\u306f\u3001MyComponent<\/code>\u304cuseEffect<\/code>\u30d5\u30c3\u30af\u3092\u4f7f\u3063\u3066API\u304b\u3089\u30c7\u30fc\u30bf\u3092\u53d6\u5f97\u3057\u307e\u3059\u3002\u30c7\u30fc\u30bf\u306e\u8aad\u307f\u8fbc\u307f\u3092\u5f85\u3064\u9593\u306b\u3001if<\/code>\u3092\u4f7f\u7528\u3057\u3066\u30b9\u30d4\u30ca\u30fc\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092\u8868\u793a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u307e\u305f\u3001\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u4e2d\u306b\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u305f\u5834\u5408\u306b\u3001\u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30afUI\u3092\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3059\u308b\u3068\u3044\u3046\u624b\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n
const<\/span> MyComponent<\/span> =<\/span> (<\/span>{<\/span> data }<\/span><\/span>)<\/span> =><\/span> {<\/span>\n  if<\/span> (<\/span>!<\/span>data)<\/span> {<\/span>\n    return<\/span> <<\/span>p><\/span><\/span>Something went wrong. Please try again later.<\/span><\/<\/span>p><\/span><\/span>;<\/span>\n  }<\/span>\n\n  return<\/span> <<\/span>div><\/span><\/span>{<\/span>\/* Render the data here *\/<\/span>}<\/span><\/<\/span>div><\/span><\/span>;<\/span>\n}<\/span>;<\/span>\n\nexport<\/span> default<\/span> MyComponent;<\/span><\/code><\/pre>\n
\u3053\u306e\u30b3\u30fc\u30c9\u3067\u306f\u3001MyComponent<\/code>\u304cdata<\/code>\u3092\u53d7\u3051\u53d6\u308a\u307e\u3059\u3002 data<\/code>\u306b\u554f\u984c\u304c\u3042\u308b\u5834\u5408\u306b\u306f\u3001 \u30b9\u30c6\u30fc\u30c8\u30e1\u30f3\u30c8\u3092\u4f7f\u7528\u3057\u3066\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3057\u307e\u3059\u3002<\/p>\n
\u307e\u305f\u3001\u4ee5\u4e0b\u306b\u3042\u308b\u3088\u3046\u306b\u3001if<\/code>\u3092\u4f7f\u7528\u3057\u3066\u3001\u30e6\u30fc\u30b6\u30fc\u5f79\u5272\u3054\u3068\u306b\u7570\u306a\u308b\u30b3\u30f3\u30c6\u30f3\u30c4\u3092\u8868\u793a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
const<\/span> MyComponent<\/span> =<\/span> (<\/span>{<\/span> user }<\/span><\/span>)<\/span> =><\/span> {<\/span>\n  if<\/span> (<\/span>user.<\/span>role ===<\/span> 'admin'<\/span>)<\/span> {<\/span>\n    return<\/span> <<\/span>p><\/span><\/span>Welcome, admin!<\/span><\/<\/span>p><\/span><\/span>;<\/span>\n  }<\/span> else<\/span> if<\/span> (<\/span>user.<\/span>role ===<\/span> 'user'<\/span>)<\/span> {<\/span>\n    return<\/span> <<\/span>p><\/span><\/span>Welcome, user!<\/span><\/<\/span>p><\/span><\/span>;<\/span>\n  }<\/span> else<\/span> {<\/span>\n    return<\/span> <<\/span>p><\/span><\/span>You are not authorized to access this page.<\/span><\/<\/span>p><\/span><\/span>;<\/span>\n  }<\/span>\n}<\/span>;<\/span>\n\nexport<\/span> default<\/span> MyComponent;<\/span><\/code><\/pre>\n
\u3053\u306e\u30b3\u30fc\u30c9\u3067\u306f\u3001MyComponent<\/code>\u304cuser<\/code>\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u53d7\u3051\u53d6\u308a\u307e\u3059\u3002user.role<\/code>\u30d7\u30ed\u30d1\u30c6\u30a3\u306b\u5fdc\u3058\u3001if<\/code>\u3092\u4f7f\u7528\u3057\u3066\u7570\u306a\u308b\u30b3\u30f3\u30c6\u30f3\u30c4\u3092\u8868\u793a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u6761\u4ef6\u4ed8\u304d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u306b\u4e09\u9805\u6f14\u7b97\u5b50\u3092\u4f7f\u7528\u3059\u308b<\/h3>\n
React\u3067\u6761\u4ef6\u4ed8\u304d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3092\u5b9f\u88c5\u3059\u308b\u3082\u30461\u3064\u306e\u65b9\u6cd5\u306b\u3001JSX\u306e\u4e09\u9805\u6f14\u7b97\u5b50\uff08?\uff09\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
\u4e09\u9805\u6f14\u7b97\u5b50\u3067\u306f\u30013\u3064\u306e\u30aa\u30da\u30e9\u30f3\u30c9\u3092\u6307\u5b9a\u3059\u308b\u3053\u3068\u3067\u3001\u30b3\u30f3\u30d1\u30af\u30c8\u306a\u30a4\u30f3\u30e9\u30a4\u30f3\u306eif-else\u6587\u3092\u8a18\u8ff0\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u6700\u521d\u306e\u30aa\u30da\u30e9\u30f3\u30c9\u306f\u6761\u4ef6\u3001\u6b8b\u308a\u306e2\u3064\u306e\u30aa\u30da\u30e9\u30f3\u30c9\u306f\u5f0f\u3067\u3059\u3002\u6761\u4ef6\u304ctrue<\/code>\u306e\u5834\u5408\u306f\u3001\u6700\u521d\u306e\u5f0f\u304c\u5b9f\u884c\u3055\u308c\u3001\u305d\u3046\u3067\u306a\u3044\u5834\u5408\u306f\u30012\u756a\u76ee\u306e\u5f0f\u304c\u5b9f\u884c\u3055\u308c\u307e\u3059\u3002<\/p>\n
\u4f8b\u3048\u3070\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306bprops\u306b\u57fa\u3065\u304d\u7570\u306a\u308b\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
import ComponentA from '.\/ComponentA';\nimport ComponentB from '.\/ComponentB';\n\nconst ExampleComponent = ({ shouldRenderComponentA }) => {\n  return (\n    <div>\n      {shouldRenderComponentA ? <ComponentA \/> : <ComponentB \/>}\n    <\/div>\n  );\n};\n\nexport default ExampleComponent;<\/code><\/pre>\n
\u3053\u306e\u30b3\u30fc\u30c9\u3067\u306f\u3001ExampleComponent<\/code>\u304cshouldRenderComponentA<\/code>\u3092\u53d7\u3051\u53d6\u308a\u307e\u3059\u3002\u305d\u3057\u3066\u3001\u4e09\u9805\u6f14\u7b97\u5b50\u3092\u4f7f\u3063\u3066\u3001\u30d7\u30ed\u30d1\u30c6\u30a3\u306e\u5024\u306b\u57fa\u3065\u3044\u3066ComponentA<\/code>\u3068ComponentB<\/code>\u306e\u3044\u305a\u308c\u304b\u3092\u6761\u4ef6\u4ed8\u304d\u3067\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u307e\u305f\u3001\u72b6\u614b\u306b\u3088\u3063\u3066\u7570\u306a\u308b\u30c6\u30ad\u30b9\u30c8\u3092\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n
import<\/span> {<\/span> useState }<\/span> from<\/span> 'react'<\/span>;<\/span>\n\nconst<\/span> ExampleComponent<\/span> =<\/span> (<\/span>)<\/span> =><\/span> {<\/span>\n  const<\/span> [<\/span>showMessage,<\/span> setShowMessage]<\/span> =<\/span> useState<\/span>(<\/span>false<\/span>)<\/span>;<\/span>\n\n  return<\/span> (<\/span>\n    <<\/span>div><\/span><\/span>\n      <<\/span>button onClick<\/span>=<\/span>{<\/span>(<\/span>)<\/span> =><\/span> setShowMessage<\/span>(<\/span>!<\/span>showMessage)<\/span>}<\/span><\/span>><\/span><\/span>\n        {<\/span>showMessage ?<\/span> 'Hide message'<\/span> :<\/span> 'Show message'<\/span>}<\/span>\n      <\/<\/span>button><\/span><\/span>\n      {<\/span>showMessage ?<\/span> <<\/span>p><\/span><\/span>Hello, world!<\/span><\/<\/span>p><\/span><\/span> :<\/span> null<\/span>}<\/span>\n    <\/<\/span>div><\/span><\/span>\n  )<\/span>;<\/span>\n}<\/span>;<\/span>\n\nexport<\/span> default<\/span> ExampleComponent;<\/span><\/code><\/pre>\n
\u3053\u306e\u4f8b\u3067\u306f\u3001\u4e09\u9805\u6f14\u7b97\u5b50\u3092\u4f7f\u7528\u3057\u3066\u3001showMessage<\/code>\u306e\u72b6\u614b\u306e\u5024\u306b\u3088\u3063\u3066\u7570\u306a\u308b\u30c6\u30ad\u30b9\u30c8\u3092\u6761\u4ef6\u4ed8\u304d\u3067\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3057\u3066\u3044\u307e\u3059\u3002\u30dc\u30bf\u30f3\u304c\u30af\u30ea\u30c3\u30af\u3055\u308c\u308b\u3068\u3001showMessage<\/code>\u306e\u5024\u304c\u5207\u308a\u66ff\u308f\u308a\u3001\u305d\u308c\u306b\u5fdc\u3058\u3066\u30c6\u30ad\u30b9\u30c8\u304c\u8868\u793a\u307e\u305f\u306f\u975e\u8868\u793a\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
\u6700\u5f8c\u306b\u3001\u30c7\u30fc\u30bf\u306e\u53d6\u5f97\u4e2d\u306b\u30b9\u30d4\u30ca\u30fc\u3092\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n
import { useState, useEffect } from 'react';\nimport Spinner from '.\/Spinner';\n\nconst ExampleComponent = () => {\n  const [isLoading, setIsLoading] = useState(true);\n  const [data, setData] = useState(null);\n\n  useEffect(() => {\n    const fetchData = async () => {\n      const response = await fetch('https:\/\/jsonplaceholder.typicode.com\/todos\/1');\n      const jsonData = await response.json();\n      setData(jsonData);\n      setIsLoading(false);\n    };\n    fetchData();\n  }, []);\n\n  return (\n    <div>\n      {isLoading ? <Spinner \/> : <p>{data.title}<\/p>}\n    <\/div>\n  );\n};\n\nexport default ExampleComponent;<\/code><\/pre>\n
\u3053\u306e\u4f8b\u3067\u306f\u3001\u4e09\u9805\u6f14\u7b97\u5b50\u3092\u4f7f\u3063\u3066\u3001API\u304b\u3089\u30c7\u30fc\u30bf\u3092\u53d6\u5f97\u3057\u3066\u3044\u308b\u9593\u3001\u6761\u4ef6\u4ed8\u304d\u3067\u30b9\u30d4\u30ca\u30fc\u3092\u8868\u793a\u3057\u3066\u3044\u307e\u3059\u3002\u30c7\u30fc\u30bf\u304c\u5229\u7528\u53ef\u80fd\u306b\u306a\u308b\u3068\u3001\u4e09\u9805\u6f14\u7b97\u5b50\u3092\u4f7f\u7528\u3057\u3066title<\/code>\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3057\u307e\u3059\u3002<\/p>\n
\u6761\u4ef6\u4ed8\u304d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u306bAND\u6f14\u7b97\u5b50\u3084OR\u6f14\u7b97\u5b50\u3092\u4f7f\u7528\u3059\u308b<\/h3>\n
React\u3067\u6761\u4ef6\u4ed8\u304d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3092\u5b9f\u88c5\u3059\u308b\u306b\u306f\u3001AND\uff08&&<\/code> \uff09\u3084OR\uff08||<\/code>\uff09\u6f14\u7b97\u5b50\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3082\u53ef\u80fd\u3067\u3059\u3002<\/p>\n
AND\u6f14\u7b97\u5b50\u3067\u306f\u3001\u3042\u308b\u6761\u4ef6\u304c\u771f\u3067\u3042\u308b\u5834\u5408\u306b\u306e\u307f\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3057\u3001OR\u6f14\u7b97\u5b50\u3067\u306f\u3001\u3069\u3061\u3089\u304b\u306e\u6761\u4ef6\u304c\u771f\u3067\u3042\u308b\u5834\u5408\u306b\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3057\u307e\u3059\u3002<\/p>\n
\u3053\u308c\u3089\u306e\u6f14\u7b97\u5b50\u306f\u3001\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3059\u308b\u304b\u3069\u3046\u304b\u3092\u6c7a\u5b9a\u3059\u308b\u5358\u7d14\u306a\u6761\u4ef6\u304c\u3042\u308b\u5834\u5408\u306b\u4fbf\u5229\u3067\u3059\u3002\u4f8b\u3048\u3070\u3001\u30d5\u30a9\u30fc\u30e0\u304c\u6709\u52b9\u306a\u5834\u5408\u306b\u306e\u307f\u30dc\u30bf\u30f3\u3092\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3057\u305f\u3044\u5834\u5408\u306f\u3001\u6b21\u306e\u3088\u3046\u306bAND\u6f14\u7b97\u5b50\u3092\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002<\/p>\n
import<\/span> {<\/span> useState }<\/span> from<\/span> 'react'<\/span>;<\/span>\n\nconst<\/span> FormComponent<\/span> =<\/span> (<\/span>)<\/span> =><\/span> {<\/span>\n  const<\/span> [<\/span>formValues,<\/span> setFormValues]<\/span> =<\/span> useState<\/span>(<\/span>{<\/span> username<\/span>:<\/span> \"\"<\/span>,<\/span> password<\/span>:<\/span> \"\"<\/span> }<\/span>)<\/span>;<\/span>\n\n  const<\/span> isFormValid =<\/span> formValues.<\/span>username &&<\/span> formValues.<\/span>password;<\/span>\n\n  const<\/span> handleSubmit<\/span> =<\/span> (<\/span>event<\/span>)<\/span> =><\/span> {<\/span>\n    event.<\/span>preventDefault<\/span>(<\/span>)<\/span>;<\/span>\n    \/\/ Submit form data<\/span>\n  }<\/span>;<\/span>\n\n  return<\/span> (<\/span>\n    <<\/span>form onSubmit<\/span>=<\/span>{<\/span>handleSubmit}<\/span><\/span>><\/span><\/span>\n      <<\/span>input\n        type<\/span>=<\/span>\"<\/span>text\"<\/span><\/span>\n        value<\/span>=<\/span>{<\/span>formValues.<\/span>username}<\/span><\/span>\n        placeholder<\/span>=<\/span>\"<\/span>Type Username...\"<\/span><\/span>\n        onChange<\/span>=<\/span>{<\/span>(<\/span>e<\/span>)<\/span> =><\/span>\n          setFormValues<\/span>(<\/span>{<\/span> ...<\/span>formValues,<\/span> username<\/span>:<\/span> e.<\/span>target.<\/span>value }<\/span>)<\/span>\n        }<\/span><\/span>\n      \/><\/span><\/span>\n      <<\/span>br \/><\/span><\/span>\n      <<\/span>input\n        type<\/span>=<\/span>\"<\/span>password\"<\/span><\/span>\n        value<\/span>=<\/span>{<\/span>formValues.<\/span>password}<\/span><\/span>\n        placeholder<\/span>=<\/span>\"<\/span>Type Password...\"<\/span><\/span>\n        onChange<\/span>=<\/span>{<\/span>(<\/span>e<\/span>)<\/span> =><\/span>\n          setFormValues<\/span>(<\/span>{<\/span> ...<\/span>formValues,<\/span> password<\/span>:<\/span> e.<\/span>target.<\/span>value }<\/span>)<\/span>\n        }<\/span><\/span>\n      \/><\/span><\/span>\n      {<\/span>isFormValid &&<\/span> <<\/span>button type<\/span>=<\/span>\"<\/span>submit\"<\/span><\/span>><\/span><\/span>Submit<\/span><\/<\/span>button><\/span><\/span>}<\/span>\n    <\/<\/span>form><\/span><\/span>\n  )<\/span>;<\/span>\n}<\/span>;<\/span>\n\nexport<\/span> default<\/span> FormComponent;<\/span><\/code><\/pre>\n
\u3053\u306e\u4f8b\u3067\u306f\u3001username<\/code>\u3068password<\/code>\u306e2\u3064\u306e\u5165\u529b\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u3042\u308b\u30d5\u30a9\u30fc\u30e0\u3092\u3001FormComponent<\/code>\u3067\u6271\u3063\u3066\u3044\u307e\u3059\u3002useState<\/code>\u30d5\u30c3\u30af\u3092\u4f7f\u3063\u3066\u30d5\u30a9\u30fc\u30e0\u306e\u5024\u3092\u7ba1\u7406\u3057\u3001isFormValid<\/code>\u5909\u6570\u3092\u4f7f\u7528\u3057\u3066\u4e21\u65b9\u306e\u5165\u529b\u30d5\u30a3\u30fc\u30eb\u30c9\u306b\u5024\u304c\u3042\u308b\u304b\u3069\u3046\u304b\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3066\u3044\u307e\u3059\u3002AND\u6f14\u7b97\u5b50\uff08&&\uff09\u3092\u4f7f\u3063\u3066\u3001isFormValid<\/code>\u304ctrue\u306e\u3068\u304d\u3060\u3051\u9001\u4fe1\u30dc\u30bf\u30f3\u3092\u8868\u793a\u3059\u308b\u3088\u3046\u306b\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u30d5\u30a9\u30fc\u30e0\u304c\u6709\u52b9\u306a\u3068\u304d\u3060\u3051\u30dc\u30bf\u30f3\u3092\u30af\u30ea\u30c3\u30af\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u540c\u69d8\u306b\u3001OR\u6f14\u7b97\u5b50\u3092\u4f7f\u3063\u3066\u3001\u30c7\u30fc\u30bf\u306e\u8aad\u307f\u8fbc\u307f\u304c\u5b8c\u4e86\u3057\u3066\u3044\u306a\u3044\u6642\u306b\u306f\u8aad\u307f\u8fbc\u307f\u4e2d\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u3001\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u305f\u5834\u5408\u306f\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
import<\/span> React,<\/span> {<\/span> useEffect,<\/span> useState }<\/span> from<\/span> 'react'<\/span>;<\/span>\n\nconst<\/span> DataComponent<\/span> =<\/span> (<\/span>)<\/span> =><\/span> {<\/span>\n  const<\/span> [<\/span>data,<\/span> setData]<\/span> =<\/span> useState<\/span>(<\/span>null<\/span>)<\/span>;<\/span>\n  const<\/span> [<\/span>isLoading,<\/span> setIsLoading]<\/span> =<\/span> useState<\/span>(<\/span>true<\/span>)<\/span>;<\/span>\n  const<\/span> [<\/span>errorMessage,<\/span> setErrorMessage]<\/span> =<\/span> useState<\/span>(<\/span>''<\/span>)<\/span>;<\/span>\n\n  useEffect<\/span>(<\/span>(<\/span>)<\/span> =><\/span> {<\/span>\n    const<\/span> fetchData<\/span> =<\/span> async<\/span> (<\/span>)<\/span> =><\/span> {<\/span>\n      try<\/span> {<\/span>\n        const<\/span> response =<\/span> await<\/span> fetch<\/span>(<\/span>'https:\/\/api.example.com\/data'<\/span>)<\/span>;<\/span>\n        const<\/span> data =<\/span> await<\/span> response.<\/span>json<\/span>(<\/span>)<\/span>;<\/span>\n        setData<\/span>(<\/span>data)<\/span>;<\/span>\n      }<\/span> catch<\/span> (<\/span>error)<\/span> {<\/span>\n        setErrorMessage<\/span>(<\/span>'An error occurred while fetching data.'<\/span>)<\/span>;<\/span>\n      }<\/span> finally<\/span> {<\/span>\n        setIsLoading<\/span>(<\/span>false<\/span>)<\/span>;<\/span>\n      }<\/span>\n    }<\/span>;<\/span>\n\n    fetchData<\/span>(<\/span>)<\/span>;<\/span>\n  }<\/span>,<\/span> [<\/span>]<\/span>)<\/span>;<\/span>\n\n  return<\/span> (<\/span>\n    <<\/span>><\/span><\/span>\n      {<\/span>errorMessage ||<\/span> isLoading ?<\/span> (<\/span>\n        <<\/span>p><\/span><\/span>{<\/span>errorMessage ||<\/span> 'Loading...'<\/span>}<\/span><\/<\/span>p><\/span><\/span>\n      )<\/span> :<\/span> (<\/span>\n        <<\/span>ul><\/span><\/span>\n          {<\/span>data.<\/span>map<\/span>(<\/span>(<\/span>item<\/span>)<\/span> =><\/span> (<\/span>\n            <<\/span>li key<\/span>=<\/span>{<\/span>item.<\/span>id}<\/span><\/span>><\/span><\/span>{<\/span>item.<\/span>name}<\/span><\/<\/span>li><\/span><\/span>\n          )<\/span>)<\/span>}<\/span>\n        <\/<\/span>ul><\/span><\/span>\n      )<\/span>}<\/span>\n    <\/<\/span>><\/span><\/span>\n  )<\/span>;<\/span>\n}<\/span>;<\/span>\n\nexport<\/span> default<\/span> DataComponent;<\/span><\/code><\/pre>\n
\u3053\u306e\u4f8b\u3067\u306f\u3001DataComponent<\/code>\u3067fetch\u3092\u4f7f\u3063\u3066API\u304b\u3089\u30c7\u30fc\u30bf\u3092\u53d6\u5f97\u3057\u3001\u305d\u308c\u3092\u30ea\u30b9\u30c8\u3068\u3057\u3066\u8868\u793a\u3057\u3066\u3044\u307e\u3059\u3002\u30c7\u30fc\u30bf\u3001\u8aad\u307f\u8fbc\u307f\u72b6\u614b\u3001\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u7ba1\u7406\u3059\u308b\u305f\u3081\u306b\u3001useState<\/code>\u30d5\u30c3\u30af\u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059\u3002\u8ad6\u7406\u548c\u6f14\u7b97\u5b50\uff08||\uff09\u3092\u4f7f\u3046\u3068\u3001\u3069\u3061\u3089\u304b\u306e\u6761\u4ef6\u304c\u771f\u3067\u3042\u308c\u3070\u3001\u8aad\u307f\u8fbc\u307f\u4e2d\u30e1\u30c3\u30bb\u30fc\u30b8\u3084\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u8868\u793a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u30c7\u30fc\u30bf\u53d6\u5f97\u30d7\u30ed\u30bb\u30b9\u306e\u73fe\u5728\u306e\u72b6\u614b\u3092\u793a\u3059\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u30e6\u30fc\u30b6\u30fc\u306b\u5bfe\u3057\u3066\u6b63\u3057\u304f\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n
React\u306e\u6761\u4ef6\u4ed8\u304d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u306bAND\u304a\u3088\u3073OR\u6f14\u7b97\u5b50\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u5358\u7d14\u306a\u6761\u4ef6\u3092\u7c21\u6f54\u306a\u8a18\u8ff0\u3067\u51e6\u7406\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3057\u304b\u3057\u3001\u3088\u308a\u8907\u96d1\u306a\u30ed\u30b8\u30c3\u30af\u306b\u306f\u3001switch<\/code>\u6587\u306a\u3069\u306e\u4ed6\u306e\u30a2\u30d7\u30ed\u30fc\u30c1\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3092\u304a\u3059\u3059\u3081\u3057\u307e\u3059\u3002<\/p>\n
\u6761\u4ef6\u4ed8\u304d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u306e\u9ad8\u5ea6\u306a\u30c6\u30af\u30cb\u30c3\u30af<\/h2>\n
React\u306e\u6761\u4ef6\u4ed8\u304d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u306f\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u8981\u4ef6\u306b\u5fdc\u3058\u3066\u3001\u3088\u308a\u8907\u96d1\u306b\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u7d9a\u3044\u3066\u306f\u3001\u8907\u96d1\u306a\u72b6\u6cc1\u3067\u6761\u4ef6\u4ed8\u304d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u306b\u4f7f\u7528\u3067\u304d\u308b\u9ad8\u5ea6\u306a\u30c6\u30af\u30cb\u30c3\u30af\u3092\u3044\u304f\u3064\u304b\u3054\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n
\u6761\u4ef6\u4ed8\u304d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u306bSwitch\u6587\u3092\u4f7f\u7528\u3059\u308b<\/h3>\n
\u6761\u4ef6\u4ed8\u304d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3067\u306f\u3001if\u6587\u3084\u4e09\u9805\u6f14\u7b97\u5b50\u304c\u4e00\u822c\u7684\u3067\u3059\u304c\u3001\u7279\u306b\u8907\u6570\u306e\u6761\u4ef6\u3092\u6271\u3046\u5834\u5408\u306f\u3001switch<\/code>\u6587\u306e\u65b9\u304c\u9069\u5207\u306a\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
\u4ee5\u4e0b\u304c\u305d\u306e\u4f8b\u3067\u3059\u3002<\/p>\n
import<\/span> React from<\/span> 'react'<\/span>;<\/span>\nconst<\/span> MyComponent<\/span> =<\/span> (<\/span>{<\/span> userType }<\/span><\/span>)<\/span> =><\/span> {<\/span>\n  switch<\/span> (<\/span>userType)<\/span> {<\/span>\n    case<\/span> 'admin'<\/span>:<\/span>\n      return<\/span> <<\/span>p><\/span><\/span>Welcome, admin user!<\/span><\/<\/span>p><\/span><\/span>;<\/span>\n    case<\/span> 'user'<\/span>:<\/span>\n      return<\/span> <<\/span>p><\/span><\/span>Welcome, regular user!<\/span><\/<\/span>p><\/span><\/span>;<\/span>\n    default<\/span>:<\/span>\n      return<\/span> <<\/span>p><\/span><\/span>Please log in to continue.<\/span><\/<\/span>p><\/span><\/span>;<\/span>\n  }<\/span>\n}<\/span>;<\/span>\nexport<\/span> default<\/span> MyComponent;<\/span><\/code><\/pre>\n
\u3053\u306e\u30b3\u30fc\u30c9\u3067\u306f\u3001switch<\/code>\u6587\u3092\u4f7f\u7528\u3057\u3066\u3001userType<\/code>\u306b\u57fa\u3065\u304f\u30b3\u30f3\u30c6\u30f3\u30c4\u3092\u6761\u4ef6\u4ed8\u304d\u3067\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u30a2\u30d7\u30ed\u30fc\u30c1\u306f\u3001\u8907\u6570\u306e\u6761\u4ef6\u3092\u6271\u3046\u3068\u304d\u306b\u4fbf\u5229\u3067\u3001\u8907\u96d1\u306a\u30ed\u30b8\u30c3\u30af\u3092\u6271\u3044\u306a\u304c\u3089\u3082\u3001\u6574\u7406\u3057\u306a\u304c\u3089\u53ef\u8aad\u6027\u3092\u78ba\u4fdd\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u6761\u4ef6\u4ed8\u304d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u306bReact Router\u3092\u4f7f\u7528\u3059\u308b<\/h3>\n
React Router\u306f\u3001React\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3067\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b5\u30a4\u30c9\u306e\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u3092\u51e6\u7406\u3059\u308b\u3053\u3068\u306e\u3067\u304d\u308b\u30e9\u30a4\u30d6\u30e9\u30ea\u3067\u3059\u3002React Router\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u73fe\u5728\u306e\u30eb\u30fc\u30c8\u306b\u57fa\u3065\u3044\u3066\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092\u6761\u4ef6\u4ed8\u304d\u3067\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u4ee5\u4e0b\u306b\u3001React Router\u3092\u4f7f\u3063\u305f\u6761\u4ef6\u4ed8\u304d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u306e\u5b9f\u88c5\u4f8b\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n
import { useState } from 'react';\nimport { BrowserRouter as Router, Route, Switch } from 'react-router-dom';\n\nimport Home from '.\/components\/Home';\nimport Login from '.\/components\/Login';\nimport Dashboard from '.\/components\/Dashboard';\nimport NotFound from '.\/components\/NotFound';\n\nconst App = () => {\n  const [isLoggedIn, setIsLoggedIn] = useState(false);\n\n  return (\n    <Router>\n      <Switch>\n        <Route exact path=\"\/\" component={Home} \/>\n        <Route path=\"\/login\">\n          <Login setIsLoggedIn={setIsLoggedIn} \/>\n        <\/Route>\n        {isLoggedIn ? (\n          <Route path=\"\/dashboard\" component={Dashboard} \/>\n        ) : (\n          <Route component={NotFound} \/>\n        )}\n      <\/Switch>\n    <\/Router>\n  );\n};\n\nexport default App;<\/code><\/pre>\n
\u3053\u306e\u30b3\u30fc\u30c9\u3067\u306f\u3001isLoggedIn<\/code>\u306e\u72b6\u614b\u3092\u4f7f\u7528\u3057\u3066\u3001\u30e6\u30fc\u30b6\u30fc\u304c\u30ed\u30b0\u30a4\u30f3\u3057\u3066\u3044\u308b\u5834\u5408\u306fDashboard<\/code> \u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092\u3001\u30e6\u30fc\u30b6\u30fc\u304c\u30ed\u30b0\u30a4\u30f3\u3057\u3066\u3044\u306a\u3044\u5834\u5408\u306fNotFound<\/code>\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092\u6761\u4ef6\u4ed8\u304d\u3067\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3057\u3066\u3044\u307e\u3059\u3002Login<\/code>\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306f\u3001\u30e6\u30fc\u30b6\u30fc\u304c\u30ed\u30b0\u30a4\u30f3\u306b\u6210\u529f\u3059\u308b\u3068\u3001isLoggedIn<\/code>\u306e\u72b6\u614b\u3092true<\/code>\u306b\u8a2d\u5b9a\u3057\u307e\u3059\u3002<\/p>\n
Login<\/code>\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3068setIsLoggedIn<\/code>\u95a2\u6570\u3092\u6e21\u3059\u305f\u3081\u306b\u3001<Route><\/code>\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306echildren props\u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001path<\/code>\u3067\u6307\u5b9a\u3059\u308b\u3053\u3068\u306a\u304f\u3001Login<\/code>\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306b\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u6e21\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n
\u307e\u3068\u3081<\/h2>\n
\u6761\u4ef6\u4ed8\u304d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u306fReact\u306e\u5f37\u529b\u306a\u30c6\u30af\u30cb\u30c3\u30af\u3067\u3001\u3055\u307e\u3056\u307e\u306a\u6761\u4ef6\u306b\u57fa\u3065\u3044\u3066UI\u3092\u52d5\u7684\u306b\u66f4\u65b0\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306eUI\u30ed\u30b8\u30c3\u30af\u306e\u8907\u96d1\u3055\u306b\u5fdc\u3058\u3066\u3001\u958b\u767a\u73fe\u5834\u306b\u9069\u3057\u305f\u30a2\u30d7\u30ed\u30fc\u30c1\u3092\u9078\u629e\u3059\u308b\u3053\u3068\u3092\u304a\u3059\u3059\u3081\u3057\u307e\u3059\u3002<\/p>\n
\u307e\u305f\u3001\u6761\u4ef6\u4ed8\u304d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u306e\u30ed\u30b8\u30c3\u30af\u304c\u3042\u3089\u3086\u308b\u72b6\u6cc1\u3067\u554f\u984c\u306a\u304f\u52d5\u4f5c\u3059\u308b\u3088\u3046\u3001\u5ff5\u3092\u5165\u308c\u3066\u30c6\u30b9\u30c8\u3059\u308b\u3053\u3068\u3092\u304a\u5fd8\u308c\u306a\u304f\u3002<\/p>\n
React\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u305f\u3081\u306e\u7406\u60f3\u7684\u306a\u30b5\u30fc\u30d0\u30fc\u3092\u304a\u63a2\u3057\u306a\u3089\u3001Kinsta\u306e\u30a6\u30a7\u30d6\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u30b5\u30fc\u30d0\u30fc<\/a>\u3092\u304a\u8a66\u3057\u304f\u3060\u3055\u3044\u3002\u7121\u6599\u5229\u7528\u67a0\u3092\u3054\u7528\u610f\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u6761\u4ef6\u4ed8\u304d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u306fReact\u306e\u5f37\u529b\u306a\u6a5f\u80fd\u3067\u3059\u3002\u3053 …<\/p>\n","protected":false},"author":287,"featured_media":46011,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_kinsta_gated_content":false,"_kinsta_gated_content_redirect":"","footnotes":""},"tags":[],"topic":[802],"class_list":["post-46010","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","topic-react"],"yoast_head":"\nReact\u306e\u6761\u4ef6\u4ed8\u304d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3092\u4f7f\u3044\u3053\u306a\u3059\uff08\u5fb9\u5e95\u89e3\u8aac\uff09\uff5cKinsta\u00ae<\/title>\n<meta name=\"description\" content=\"\u4eca\u56de\u306e\u8a18\u4e8b\u3067\u306f\u3001React\u306e\u6761\u4ef6\u4ed8\u304d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u306e\u7c21\u5358\u306a\u4ed5\u7d44\u307f\u3001\u305d\u3057\u3066\u3001\u3053\u308c\u3092\u3042\u3089\u3086\u308b\u65b9\u6cd5\u3067\u5b9f\u88c5\u3059\u308b\u65b9\u6cd5\u3092\u3054\u7d39\u4ecb\u3057\u307e\u3059\u3002\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/kinsta.com\/jp\/blog\/react-conditional-render\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"React\u306e\u6761\u4ef6\u4ed8\u304d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3092\u4f7f\u3044\u3053\u306a\u3059\uff08\u5fb9\u5e95\u89e3\u8aac\uff09\" \/>\n<meta property=\"og:description\" content=\"\u4eca\u56de\u306e\u8a18\u4e8b\u3067\u306f\u3001React\u306e\u6761\u4ef6\u4ed8\u304d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u306e\u7c21\u5358\u306a\u4ed5\u7d44\u307f\u3001\u305d\u3057\u3066\u3001\u3053\u308c\u3092\u3042\u3089\u3086\u308b\u65b9\u6cd5\u3067\u5b9f\u88c5\u3059\u308b\u65b9\u6cd5\u3092\u3054\u7d39\u4ecb\u3057\u307e\u3059\u3002\" \/>\n<meta property=\"og:url\" content=\"https:\/\/kinsta.com\/jp\/blog\/react-conditional-render\/\" \/>\n<meta property=\"og:site_name\" content=\"Kinsta\u00ae\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/Kinsta-Japan-334616080691171\/\" \/>\n<meta property=\"article:published_time\" content=\"2023-05-26T10:07:56+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-08-25T15:18:09+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/kinsta.com\/jp\/wp-content\/uploads\/sites\/6\/2023\/05\/react-conditional-render.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1460\" \/>\n\t<meta property=\"og:image:height\" content=\"730\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Joel Olawanle\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:description\" content=\"\u4eca\u56de\u306e\u8a18\u4e8b\u3067\u306f\u3001React\u306e\u6761\u4ef6\u4ed8\u304d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u306e\u7c21\u5358\u306a\u4ed5\u7d44\u307f\u3001\u305d\u3057\u3066\u3001\u3053\u308c\u3092\u3042\u3089\u3086\u308b\u65b9\u6cd5\u3067\u5b9f\u88c5\u3059\u308b\u65b9\u6cd5\u3092\u3054\u7d39\u4ecb\u3057\u307e\u3059\u3002\" \/>\n<meta name=\"twitter:image\" content=\"https:\/\/kinsta.com\/jp\/wp-content\/uploads\/sites\/6\/2023\/05\/react-conditional-render.jpg\" \/>\n<meta name=\"twitter:creator\" content=\"@olawanle_joel\" \/>\n<meta name=\"twitter:site\" content=\"@Kinsta_JP\" \/>\n<meta name=\"twitter:label1\" content=\"\u57f7\u7b46\u8005\" \/>\n\t<meta name=\"twitter:data1\" 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