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【React】textareaを特定のキーで確定できるようにする方法

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以下のように記述するとcmd + Enterまたはctl + Entertextareaの内容をsubmitできます。

// ...
export function Sample() {
  // ...

  const handleKeyDown = (event: React.KeyboardEvent<HTMLTextAreaElement>) => {
    if (event.key === 'Enter' && (event.metaKey || event.ctrlKey)) {
      // submitのための処理
    }
  }

  return (
    <form onSubmit={handleSubmitWrapper} onBlur={handleBlur}>
      <textarea
        onKeyDown={handleKeyDown}
      />
    </form>
  )
}
// ...

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