{"id":15763,"date":"2023-04-04T14:49:36","date_gmt":"2023-04-04T11:19:36","guid":{"rendered":"https:\/\/nabfollower.com\/blog\/refs-in-react-from-access-to-dom-to-imperative-api-j2l\/"},"modified":"2023-04-04T14:49:36","modified_gmt":"2023-04-04T11:19:36","slug":"refs-in-react-from-access-to-dom-to-imperative-api-j2l","status":"publish","type":"post","link":"https:\/\/nabfollower.com\/blog\/refs-in-react-from-access-to-dom-to-imperative-api-j2l\/","title":{"rendered":"Refs \u062f\u0631 React: \u0627\u0632 \u062f\u0633\u062a\u0631\u0633\u06cc \u0628\u0647 DOM \u062a\u0627 API \u0636\u0631\u0648\u0631\u06cc"},"content":{"rendered":"
\n

\"\u062a\u0648\u0636\u06cc\u062d\u0627\u062a<\/p>\n

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\n
const<\/span> element<\/span> =<\/span> document<\/span>.<\/span>getElementById<\/span>(<\/span>\"<\/span>bla<\/span>\"<\/span>);<\/span>\n<\/code><\/pre>\n
\n
\n    \u0648\u0627\u0631\u062f \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0634\u0648\u06cc\u062f<\/title>\n    \n<\/svg><\/p>\n
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\n
element<\/span>.<\/span>focus<\/span>();<\/span>\n<\/code><\/pre>\n
\n
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\u06cc\u0627 \u0628\u0647 \u0622\u0646 \u0628\u0631\u0648\u06cc\u062f:<\/p>\n
\n
element<\/span>.<\/span>scrollIntoView<\/span>();<\/span>\n<\/code><\/pre>\n
\n
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\u06cc\u0627 \u0647\u0631 \u0686\u06cc\u0632 \u062f\u06cc\u06af\u0631\u06cc \u06a9\u0647 \u062f\u0644\u0645\u0627\u0646 \u0628\u062e\u0648\u0627\u0647\u062f.  \u0628\u0631\u062e\u06cc \u0627\u0632 \u0645\u0648\u0627\u0631\u062f \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0645\u0639\u0645\u0648\u0644 \u0628\u0631\u0627\u06cc \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 DOM API \u0628\u0648\u0645\u06cc \u062f\u0631 \u062f\u0646\u06cc\u0627\u06cc React \u0639\u0628\u0627\u0631\u062a\u0646\u062f \u0627\u0632:<\/p>\n
    \n
  • \u0628\u0647 \u0635\u0648\u0631\u062a \u062f\u0633\u062a\u06cc \u062a\u0645\u0631\u06a9\u0632 \u06cc\u06a9 \u0639\u0646\u0635\u0631<\/strong> \u067e\u0633 \u0627\u0632 \u0631\u0646\u062f\u0631 \u0634\u062f\u0646\u060c \u0645\u0627\u0646\u0646\u062f \u06cc\u06a9 \u0641\u06cc\u0644\u062f \u0648\u0631\u0648\u062f\u06cc \u062f\u0631 \u06cc\u06a9 \u0641\u0631\u0645<\/li>\n
  • \u062a\u0634\u062e\u06cc\u0635 \u06cc\u06a9 \u06a9\u0644\u06cc\u06a9 \u062e\u0627\u0631\u062c \u0627\u0632 \u06cc\u06a9 \u062c\u0632\u0621<\/strong> \u0647\u0646\u06af\u0627\u0645 \u0646\u0645\u0627\u06cc\u0634 \u0639\u0646\u0627\u0635\u0631 \u067e\u0646\u062c\u0631\u0647 \u0645\u0627\u0646\u0646\u062f<\/li>\n
  • \u0628\u0647 \u0635\u0648\u0631\u062a \u062f\u0633\u062a\u06cc \u067e\u06cc\u0645\u0627\u06cc\u0634 \u0628\u0647 \u06cc\u06a9 \u0639\u0646\u0635\u0631<\/strong> \u0628\u0639\u062f \u0627\u0632 \u0627\u06cc\u0646\u06a9\u0647 \u0631\u0648\u06cc \u0635\u0641\u062d\u0647 \u0638\u0627\u0647\u0631 \u0634\u062f<\/li>\n
  • \n\u0645\u062d\u0627\u0633\u0628\u0647 \u0627\u0646\u062f\u0627\u0632\u0647 \u0647\u0627 \u0648 \u0645\u0631\u0632\u0647\u0627<\/strong> \u0627\u0632 \u0627\u062c\u0632\u0627\u06cc \u0631\u0648\u06cc \u0635\u0641\u062d\u0647 \u0646\u0645\u0627\u06cc\u0634 \u0628\u0631\u0627\u06cc \u0642\u0631\u0627\u0631 \u062f\u0627\u062f\u0646 \u0686\u06cc\u0632\u06cc \u0645\u0627\u0646\u0646\u062f \u06cc\u06a9 \u0631\u0627\u0647\u0646\u0645\u0627\u06cc \u0627\u0628\u0632\u0627\u0631 \u0628\u0647 \u062f\u0631\u0633\u062a\u06cc<\/li>\n<\/ul>\n
    \u0648 \u0627\u06af\u0631\u0686\u0647\u060c \u0627\u0632 \u0646\u0638\u0631 \u0641\u0646\u06cc\u060c \u0647\u06cc\u0686 \u0686\u06cc\u0632 \u0645\u0627 \u0631\u0627 \u0627\u0632 \u0627\u0646\u062c\u0627\u0645 \u0622\u0646 \u0628\u0627\u0632 \u0646\u0645\u06cc \u062f\u0627\u0631\u062f getElementById<\/code> \u062d\u062a\u06cc \u0627\u0645\u0631\u0648\u0632\u0647\u060c React \u0631\u0627\u0647 \u06a9\u0645\u06cc \u0642\u062f\u0631\u062a\u0645\u0646\u062f\u062a\u0631 \u0628\u0631\u0627\u06cc \u062f\u0633\u062a\u0631\u0633\u06cc \u0628\u0647 \u0622\u0646 \u0639\u0646\u0635\u0631 \u0628\u0647 \u0645\u0627 \u0645\u06cc \u062f\u0647\u062f \u06a9\u0647 \u0646\u06cc\u0627\u0632\u06cc \u0628\u0647 \u0627\u0646\u062a\u0634\u0627\u0631 \u0634\u0646\u0627\u0633\u0647 \u0647\u0627 \u062f\u0631 \u0647\u0645\u0647 \u062c\u0627 \u06cc\u0627 \u0622\u06af\u0627\u0647\u06cc \u0627\u0632 \u0633\u0627\u062e\u062a\u0627\u0631 DOM \u0627\u0633\u0627\u0633\u06cc \u0646\u062f\u0627\u0631\u062f: refs.<\/p>\n
    Ref \u0641\u0642\u0637 \u06cc\u06a9 \u0634\u06cc\u0621 \u0642\u0627\u0628\u0644 \u062a\u063a\u06cc\u06cc\u0631 \u0627\u0633\u062a\u060c \u0645\u0631\u062c\u0639\u06cc \u06a9\u0647 React \u0628\u06cc\u0646 \u0631\u0646\u062f\u0631\u0647\u0627\u06cc \u0645\u062c\u062f\u062f \u0628\u0647 \u0622\u0646 \u062d\u0641\u0638 \u0645\u06cc \u06a9\u0646\u062f.  \u0631\u0646\u062f\u0631 \u0645\u062c\u062f\u062f \u0631\u0627 \u0631\u0627\u0647 \u0627\u0646\u062f\u0627\u0632\u06cc \u0646\u0645\u06cc \u06a9\u0646\u062f\u060c \u0628\u0646\u0627\u0628\u0631\u0627\u06cc\u0646 \u0628\u0647 \u0647\u06cc\u0686 \u0648\u062c\u0647 \u062c\u0627\u06cc\u06af\u0632\u06cc\u0646\u06cc \u0628\u0631\u0627\u06cc \u062d\u0627\u0644\u062a \u0646\u06cc\u0633\u062a\u060c \u0633\u0639\u06cc \u0646\u06a9\u0646\u06cc\u062f \u0627\u0632 \u0622\u0646 \u0628\u0631\u0627\u06cc \u0622\u0646 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0646\u06cc\u062f.  \u062c\u0632\u0626\u06cc\u0627\u062a \u0628\u06cc\u0634\u062a\u0631 \u062f\u0631 \u0645\u0648\u0631\u062f \u062a\u0641\u0627\u0648\u062a \u0628\u06cc\u0646 \u0627\u06cc\u0646 \u062f\u0648 \u062f\u0631 \u0627\u0633\u0646\u0627\u062f \u0645\u0648\u062c\u0648\u062f \u0627\u0633\u062a.<\/p>\n
    \u0628\u0627 \u0627\u06cc\u062c\u0627\u062f \u0634\u062f\u0647 \u0627\u0633\u062a useRef<\/code> \u0642\u0644\u0627\u0628:<\/p>\n
    \n
    const<\/span> Component<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\n  \/\/ create a ref with default value null<\/span>\n  const<\/span> ref<\/span> =<\/span> useRef<\/span>(<\/span>null<\/span>);<\/span>\n\n  return<\/span> ...<\/span>\n}<\/span>\n<\/code><\/pre>\n
    \n
    \n    \u0648\u0627\u0631\u062f \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0634\u0648\u06cc\u062f<\/title>\n    \n<\/svg><\/p>\n
        \u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    \n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n
    \u0648 \u0645\u0642\u062f\u0627\u0631 \u0630\u062e\u06cc\u0631\u0647 \u0634\u062f\u0647 \u062f\u0631 Ref \u062f\u0631 \u0648\u06cc\u0698\u06af\u06cc “\u062c\u0627\u0631\u06cc” (\u0648 \u062a\u0646\u0647\u0627) \u0622\u0646 \u0645\u0648\u062c\u0648\u062f \u062e\u0648\u0627\u0647\u062f \u0628\u0648\u062f.  \u0648 \u0645\u0627 \u062f\u0631 \u0648\u0627\u0642\u0639 \u0645\u06cc \u062a\u0648\u0627\u0646\u06cc\u0645 \u0647\u0631 \u0686\u06cc\u0632\u06cc \u0631\u0627 \u062f\u0631 \u0622\u0646 \u0630\u062e\u06cc\u0631\u0647 \u06a9\u0646\u06cc\u0645!  \u0628\u0631\u0627\u06cc \u0645\u062b\u0627\u0644\u060c \u0645\u06cc\u200c\u062a\u0648\u0627\u0646\u06cc\u0645 \u06cc\u06a9 \u0634\u06cc \u0631\u0627 \u0628\u0627 \u0645\u0642\u0627\u062f\u06cc\u0631\u06cc \u0627\u0632 \u062d\u0627\u0644\u062a \u0630\u062e\u06cc\u0631\u0647 \u06a9\u0646\u06cc\u0645:<\/p>\n
    \n
    const<\/span> Component<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\n  const<\/span> ref<\/span> =<\/span> useRef<\/span>(<\/span>null<\/span>);<\/span>\n\n  useEffect<\/span>(()<\/span> =><\/span> {<\/span>\n    \/\/ re-write ref's default value with new object<\/span>\n    ref<\/span>.<\/span>current<\/span> =<\/span> {<\/span>\n      someFunc<\/span>:<\/span> ()<\/span> =><\/span> {...},<\/span>\n      someValue<\/span>:<\/span> stateValue<\/span>,<\/span>\n    }<\/span>\n  },<\/span> [<\/span>stateValue<\/span>])<\/span>\n\n\n  return<\/span> ...<\/span>\n}<\/span>\n<\/code><\/pre>\n
    \n
    \n    \u0648\u0627\u0631\u062f \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0634\u0648\u06cc\u062f<\/title>\n    \n<\/svg><\/p>\n
        \u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    \n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n
    \u06cc\u0627 \u0645\u0647\u0645\u062a\u0631 \u0627\u0632 \u0622\u0646 \u0628\u0631\u0627\u06cc \u0645\u0648\u0631\u062f \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0645\u0627\u060c \u0645\u06cc \u062a\u0648\u0627\u0646\u06cc\u0645 \u0627\u06cc\u0646 Ref \u0631\u0627 \u0628\u0647 \u0647\u0631 \u0639\u0646\u0635\u0631 DOM \u0648 \u0628\u0631\u062e\u06cc \u0627\u0632 \u0627\u062c\u0632\u0627\u06cc React \u0627\u062e\u062a\u0635\u0627\u0635 \u062f\u0647\u06cc\u0645:<\/p>\n
    \n
    const<\/span> Component<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\n  const<\/span> ref<\/span> =<\/span> useRef<\/span>(<\/span>null<\/span>);<\/span>\n\n  \/\/ assing ref to an input element<\/span>\n  return<\/span> <<\/span>input<\/span> ref<\/span>=<\/span>{<\/span>ref<\/span>}<\/span> \/><\/span>\n}<\/span>\n<\/code><\/pre>\n
    \n
    \n    \u0648\u0627\u0631\u062f \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0634\u0648\u06cc\u062f<\/title>\n    \n<\/svg><\/p>\n
        \u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    \n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n
    \u062d\u0627\u0644\u0627 \u0627\u06af\u0631 \u0644\u0627\u06af\u06cc\u0646 \u06a9\u0646\u0645 ref.current<\/code> \u06a9\u0647 \u062f\u0631 useEffect<\/code> (\u0641\u0642\u0637 \u067e\u0633 \u0627\u0632 \u0631\u0646\u062f\u0631 \u0634\u062f\u0646 \u06cc\u06a9 \u0645\u0624\u0644\u0641\u0647 \u062f\u0631 \u062f\u0633\u062a\u0631\u0633 \u0627\u0633\u062a)\u060c \u062e\u0648\u0627\u0647\u0645 \u062f\u06cc\u062f \u062f\u0642\u06cc\u0642\u0627<\/em> \u0647\u0645\u0627\u0646 \u0639\u0646\u0635\u0631\u06cc \u06a9\u0647 \u0627\u06af\u0631 \u0628\u062e\u0648\u0627\u0647\u0645 \u0627\u0646\u062c\u0627\u0645 \u062f\u0647\u0645\u060c \u0628\u0647 \u062f\u0633\u062a \u0645\u06cc\u200c\u0622\u0648\u0631\u0645 getElementById<\/code> \u062f\u0631 \u0622\u0646 \u0648\u0631\u0648\u062f\u06cc:<\/p>\n
    \n
    const<\/span> Component<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\n  const<\/span> ref<\/span> =<\/span> useRef<\/span>(<\/span>null<\/span>);<\/span>\n\n  useEffect<\/span>(()<\/span> =><\/span> {<\/span>\n    \/\/ this will be a reference to input DOM element!<\/span>\n    \/\/ exactly the same as if I did getElementById for it<\/span>\n    console<\/span>.<\/span>log<\/span>(<\/span>ref<\/span>.<\/span>current<\/span>);<\/span>\n  });<\/span>\n\n  return<\/span> <<\/span>input<\/span> ref<\/span>=<\/span>{<\/span>ref<\/span>}<\/span> \/><\/span>\n}<\/span>\n<\/code><\/pre>\n
    \n
    \n    \u0648\u0627\u0631\u062f \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0634\u0648\u06cc\u062f<\/title>\n    \n<\/svg><\/p>\n
        \u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    \n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n
    \u0648 \u0627\u06a9\u0646\u0648\u0646\u060c \u0627\u06af\u0631 \u0645\u0646 \u0641\u0631\u0645 \u062b\u0628\u062a \u0646\u0627\u0645 \u062e\u0648\u062f \u0631\u0627 \u0628\u0647 \u0639\u0646\u0648\u0627\u0646 \u06cc\u06a9 \u062c\u0632\u0621 \u063a\u0648\u0644 \u067e\u06cc\u06a9\u0631 \u067e\u06cc\u0627\u062f\u0647 \u0633\u0627\u0632\u06cc \u0645\u06cc \u06a9\u0631\u062f\u0645\u060c \u0645\u06cc \u062a\u0648\u0627\u0646\u0633\u062a\u0645 \u06a9\u0627\u0631\u06cc \u0634\u0628\u06cc\u0647 \u0628\u0647 \u0627\u06cc\u0646 \u0627\u0646\u062c\u0627\u0645 \u062f\u0647\u0645:<\/p>\n
    \n
    const<\/span> Form<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\n  const<\/span> [<\/span>name<\/span>,<\/span> setName<\/span>]<\/span> =<\/span> useState<\/span>(<\/span>''<\/span>);<\/span>\n  const<\/span> inputRef<\/span> =<\/span> useRef<\/span>(<\/span>null<\/span>);<\/span>\n\n  const<\/span> onSubmitClick<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\n    if<\/span> (<\/span>!<\/span>name<\/span>)<\/span> {<\/span>\n      \/\/ focus the input field if someone tries to submit empty name<\/span>\n      ref<\/span>.<\/span>current<\/span>.<\/span>focus<\/span>();<\/span>\n    }<\/span> else<\/span> {<\/span>\n      \/\/ submit the data here!<\/span>\n    }<\/span>\n  }<\/span>\n\n  return<\/span> <><\/span>\n    ...\n    <<\/span>input<\/span> onChange<\/span>=<\/span>{<\/span>(<\/span>e<\/span>)<\/span> =><\/span> setName<\/span>(<\/span>e<\/span>.<\/span>target<\/span>.<\/span>value<\/span>)<\/span>}<\/span> ref<\/span>=<\/span>{<\/span>ref<\/span>}<\/span> \/><\/span>\n    <<\/span>button<\/span> onClick<\/span>=<\/span>{<\/span>onSubmitClick<\/span>}<\/span>><\/span>Submit the form!<\/<\/span>button<\/span>><\/span>\n  <\/><\/span>\n}<\/span>\n<\/code><\/pre>\n
    \n
    \n    \u0648\u0627\u0631\u062f \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0634\u0648\u06cc\u062f<\/title>\n    \n<\/svg><\/p>\n
        \u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    \n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n
    \u0645\u0642\u0627\u062f\u06cc\u0631 \u0648\u0631\u0648\u062f\u06cc\u200c\u0647\u0627 \u0631\u0627 \u062f\u0631 \u062d\u0627\u0644\u062a \u0630\u062e\u06cc\u0631\u0647 \u06a9\u0646\u06cc\u062f\u060c \u0628\u0631\u0627\u06cc \u0647\u0645\u0647 \u0648\u0631\u0648\u062f\u06cc\u200c\u0647\u0627 ref \u0627\u06cc\u062c\u0627\u062f \u06a9\u0646\u06cc\u062f \u0648 \u0648\u0642\u062a\u06cc \u062f\u06a9\u0645\u0647 \u00absubmit\u00bb \u06a9\u0644\u06cc\u06a9 \u0645\u06cc\u200c\u0634\u0648\u062f\u060c \u0628\u0631\u0631\u0633\u06cc \u0645\u06cc\u200c\u06a9\u0646\u0645 \u06a9\u0647 \u0622\u06cc\u0627 \u0645\u0642\u0627\u062f\u06cc\u0631 \u062e\u0627\u0644\u06cc \u0646\u06cc\u0633\u062a\u0646\u062f \u0648 \u0627\u06af\u0631 \u0647\u0633\u062a\u0646\u062f – \u0648\u0631\u0648\u062f\u06cc \u0645\u0648\u0631\u062f \u0646\u06cc\u0627\u0632 \u0631\u0627 \u0645\u062a\u0645\u0631\u06a9\u0632 \u06a9\u0646\u06cc\u062f.<\/p>\n
    \u0627\u062c\u0631\u0627\u06cc \u0627\u06cc\u0646 \u0641\u0631\u0645 \u0631\u0627 \u062f\u0631 \u0627\u06cc\u0646 \u062c\u0639\u0628\u0647 \u062c\u0639\u0628\u0647 \u06a9\u062f \u0628\u0631\u0631\u0633\u06cc \u06a9\u0646\u06cc\u062f:<\/p>\n