[Note] React: React Router DOM v 6.3.X


Posted by urlun0404 on 2022-10-27

🚨 這不是 v6.4.X 的筆記

這篇接續之前的v5筆記,考慮到v6.4有許多更新,所以這篇只先記錄v6.3.0的一些小改動。



React Router DOM v6.3.0

安裝指令:

$ npm i react-router-dom@6



Component

Overview

  • <Routes>
    • replace v5: <Switch />
  • <Route path="" element={ <Component /> } />
    • delete v5: exact prop
  • <NavLink />
    • delete v5: activeClassName prop
  • <Navigate to="" /> or <Navigate to="" replace />
    • replace v5: <Redirect />
  • Delete <Prompt />, usePrompt(), useBlocker()

<Routes > & <Route >

  • <Routes>: 取代v5的<Switch >
  • <Route element={<Component />}/>:改成將component放進element屬性,而不是過去的巢狀結構;
  • <Route > 沒有exact屬性:v6.x預設是exact match,所以刪除v5的exact屬性
  • v6.x 版本範例如下:
      export default function App(){
          return
          (<Routes>
              <Route path="/home" element={<Home/>} />
              <Route path="/about" element={<About/>} />
              <Route path="/interests" element={<Interests/>} />
              <Route path="/interests/reading" element={<Reading/>} />
          </Routes>);
      }
    
  • Relative path

    • v5的巢狀路由(nested routes)或是<Link >都要明確把parent component的path寫進path,例如:/books/book-id
    • v6則要在parent component的path加上wildcard /*,如範例的/books/*;而nested component則可省略parent component的path,如範例中的/book-id

      function BookStore(){
        // ...
        return (
            <Routes>
                <Route path="/books/*" element={<Books/>} />
            </Routes>
        );
      }
      
      function Books(){
        // ...
        return (
             <Routes>
                <Route path="/book-id" element={<Book/>} />
            </Routes>
        )
      }
      


<NavLink >

  • <NavLink> 刪除v5的activeClassName屬性,可以直接用className屬性和component的狀態(state)定義樣式:
      NavLink className={state => state.isActive && classes.active}
    

<Navigate >

  • v6.x 刪除v5的 <Redirect >
  • <Navigate> 可以用來取代v5的 <Redirect >,範例如下:

     // 預設以push模式導向至/home
     <Route path="/" element={<Navigate to="/home" />}>
    
     // 以replace模式導向至/home
     <Route path="/" element={<Navigate replace to="/home" />}>
    




Hook

Overview

  • useNavigate
    • replace v5: useHistory
  • useMatch
    • replace v5: useRouteMatch

useNavigate

  • useNavigate 是用來取代v5的useHistory
  • useNavigate 可直接輸入數值切換至上一頁/下一頁:正值代表forward、負值代表backword

      import { useNavigate } from 'react-router-dom';
    
      navigate(1)    // Forward to the next page
      navigate(-1)   // Backword to the last page
    
  • useNavigate() 預設是push模式導向其他路徑,也可輸入參數{replace: true} 以replace模式導向至其他路徑

      import { useNavigate } from 'react-router-dom';
    
      export default function Form(){
          // ...
          const navigate = useNavigate();
    
          const submitForm = () => {
              // Prevent prompting message when the form is submitted
              setIsFormFocused(true);
    
              // *Direct to root page in replace mode
              navigate('/');
    
              // note. Direct to root page in push mode (default)
              // navigate('/', {replace: true})
          }
    
          return (<>
              <form>
                  {/* ... */}
                  <button onClick={submitForm}>Submit</button>
              </form>
          </>);
      }
    


useMatch

  • useMatch({ end }) 取代 useRouteMatch({ strict })
  • useMatch({ caseSensitive }) 取代 useRouteMatch({ sensitive })



Nested Routes

v6有兩種巢狀路由的寫法

  1. child component的路由寫在parent component內,如範例的 <Route path="/book-id" element={<Book/>}> 是寫在Books component裡:

     function BookStore(){
         // ...
         return (
             <Routes>
                 <Route path="/books/*" element={<Books/>} />
             </Routes>
         );
     }
    
     function Books(){
         // ...
         return (
              <Routes>
                 <Route path="/book-id" element={<Book/>} />
             </Routes>
         )
     }
    


  2. 第二種則是把child component的路由直接寫在parent component的路由<Route></Route>裡面

     function BookStore(){
         // ...
         return (
             <Routes>
                 <Route path="/books/*" element={<Books/>}>
                     <Route path="/book-id" element={<Book/>}/>
                 </Route>
             </Routes>
         );
     }
    



References
Upgrade to React Router v6
React-Router-DOM DOCs
React-Router-DOM v6.3 DOCs
React - The Complete Guide (incl Hooks, React Router, Redux)


#frontend #React #react-router #react-router-dom







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