使用 react-router-dom 重新加载页面时出现问题

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【中文标题】使用 react-router-dom 重新加载页面时出现问题【英文标题】:Problem when reloading page using react-router-dom 【发布时间】:2021-08-16 08:08:20 【问题描述】:

我设法创建了一条私人路线并使用react-router-dom 导航到不同的页面。但是,当我导航到一个页面并重新加载它时,它首先会转到 /login 半秒钟,然后正确地重新加载页面。如何防止这种不良行为并改进我的路由?

这是我的路线:

    <Router>
      <Route
        path="/"
        component=() =>
          !auth ? <Redirect to="/login" /> : <Redirect to=path />
        
      />
      <Route exact path="/home" component=Home />
      <Route exact path="/dashboard" component=Dashboard />
      <Route exact path="/login" component=RedirectPage />
    </Router>

这是完整的组件:

import 
  Route,
  BrowserRouter as Router,
  Link,
  Redirect,
 from "react-router-dom";
import  Container, Button  from "@material-ui/core/";
import Login from "./Login";
import  useContext,useState  from "react";
import  UserContext  from "../App";
import  signOut  from "../Storage/Auth";

const Routes = () => 
  const  auth, setAuth, logging  = useContext(UserContext);
  const [path,setPath] = useState("/home")
  const handleSignOut = () => 
    signOut(setAuth);
    console.log("Auth", auth);
  ;

  const Home = () => 
    console.log("Home");
    return (
      <Container>
        <h1>Welcome</h1>
        <Link to="/">
          <Button onClick=handleSignOut> Log Out</Button>
        </Link>
        <Link to="/dashboard">
          <Button> Dash</Button>
        </Link>
      </Container>
    );
  ;

  const Dashboard = () => 
    setPath("/dashboard")
    console.log("Dash");
    return (
      <Container>
        <Link to="/home">
          <Button> HOME</Button>
        </Link>
        <h1>Dashboard</h1>
      </Container>
    );
  ;

  const RedirectPage = () => 
    if (!logging) 
      return <div></div>;
     else 
      return <Login />;
    
  ;

  return (
    <Router>
      <Route
        path="/"
        component=() =>
          !auth ? <Redirect to="/login" /> : <Redirect to=path />
        
      />
      <Route exact path="/home" component=Home />
      <Route exact path="/dashboard" component=Dashboard />
      <Route exact path="/login" component=RedirectPage />
    </Router>
  );
;

export  Routes ;

这是我的Login 组件。

import  useState, useContext  from "react";
import 
  Button,
  Card,
  Container,
  Typography,
  Box,
  TextField,
 from "@material-ui/core/";
import  useHistory from "react-router-dom";
import  signIn  from "../Storage/Auth";
import  UserContext  from "../App";

const Login = () => 
  const [mail, setMail] = useState<string>("");
  const [password, setPassword] = useState<string>("");
  const  user, setUser  = useContext(UserContext);

  const handleSignIn = async (m: string, p: string) => 
    await signIn(m, p).then((e) => 
      console.log("USERID", e, user);
      setUser(e);
    );
  ;

  const history = useHistory();
  const handleEnter = () => 
    history.push("/home");
  ;

  const handleOnKey = (e: any) => 
    if (e.key === "Enter") 
      e.preventDefault();
      handleSignIn(mail, password);
      handleEnter();
    
  ;

  return (
    <Card className="Card" raised=true>
      <Container className="Input">
        <Typography className="Sign-in" paragraph=true variant="inherit">
          Sign in
        </Typography>
        <Box
          className="Box"
          borderColor="error.main"
          border=2
          borderRadius="borderRadius"
        >
          <Container>
            <TextField
              fullWidth=true
              placeholder=" email"
              value=mail
              onChange=(e) => 
                setMail(e.target.value);
              
              onKeyDown=(e) => 
                handleOnKey(e);
              
            />
          </Container>
        </Box>
      </Container>
      <Container className="Input">
        <Box
          className="Box"
          borderColor="error.main"
          borderRadius="borderRadius"
          border=2
        >
          <Container>
            <TextField
              fullWidth=true
              placeholder=" password"
              value=password
              onChange=(e) => 
                setPassword(e.target.value);
              
              type="password"
              onKeyDown=(e) => 
                handleOnKey(e);
              
            />
          </Container>
        </Box>
        <h1> </h1>
        <Button
          onClick=() => 
            handleSignIn(mail, password);
          
          fullWidth=true
          color="primary"
          variant="contained"
          type="submit"
        >
          Sign In" "
        </Button>
        <h1> </h1>
        <Box className="Sign-in">
            <Button size="small"> Register </Button>
        </Box>
        <h1> </h1>
      </Container>
    </Card>
  );
;

export default Login;

这是App 组件:

import  useEffect  from "react";
import  Routes  from "./Routing/Routes";
import "./App.css";
import  Container  from "@material-ui/core/";
import initFirebase from "./Storage/Secret";
import  useState, createContext  from "react";
import  onAuthChange  from "./Storage/Auth";

export const UserContext = createContext<any>(null);
function App() 
  const [user, setUser] = useState(null);
  const [auth, setAuth] = useState<string | null>("");
  const [logging, setLogging] = useState(null)
  useEffect(() => 
    initFirebase();
  , []);

  useEffect(() => 
    onAuthChange(setAuth,setLogging);
  , [auth]);

  return (
    <UserContext.Provider value= user, setUser, auth,setAuth,logging >
      <div className="App">
        <Container>
          <Routes />
        </Container>
      </div>
    </UserContext.Provider>
  );


export default App;

另外,这里是auth 逻辑:

import firebase from "firebase/app";
import "firebase/auth";

const auth = () => firebase.auth();

const signIn = async (email, password) => 
  await auth()
    .signInWithEmailAndPassword(email, password)
    .then((userCredential) => 
      var user = userCredential.user;
      console.log("USER", user);
      return user.uid;
    )
    .catch((error) => 
      var errorCode = error.code;
      var errorMessage = error.message;
      alert(errorCode, errorMessage);
      return null;
    );
;

const onAuthChange = (setState, setLoading) => 
  auth().onAuthStateChanged((u) => 
    if (!u) 
      console.log(u);
      setLoading(true);
     else 
      setState(u);
      setLoading(false);
    
  );
;

const signOut = (setState) => 
    auth()
    .signOut()
    .then(function () 
      console.log("LOGGED OUT");
    )
    .catch(function (error) 
      console.log("ERROR LOGGING OUT");
    );
  setState(null);
;
export  signIn, signOut, onAuthChange 

最后,完整代码在https://gitlab.com/programandoconro/adminkanjicreator

任何建议将不胜感激,谢谢。

【问题讨论】:

您能否分享您的私有路由组件,以便我们在解析身份验证状态时查看它的作用,以及您使用私有路由的代码?我怀疑你没有实际上有一个PrivateRoute 组件虽然通过你的代码sn-p 来判断。您还可以包括您的UserContext 代码吗?如果您在实施身份验证流程方面需要帮助,请查看docs 以获取身份验证工作流程示例。 @DrewReese 我更新了问题,并将此链接添加到完整的 repo gitlab.com/programandoconro/adminkanjicreator auth 状态的正常值是多少?您可以从与“已验证”或“未验证”状态不同的初始状态开始,然后等待 not 的值等于初始状态。 @DrewReese 我添加了身份验证逻辑。谢谢您的建议。我会对此进行试验。 【参考方案1】:

我建议早点进行身份验证检查。所以像这样的东西,这样路由本身只有在 auth 中有东西时才会被渲染。我认为您的示例也缺少通常有帮助的 Switch 语句。

<Router>
    !auth ? (
        <Switch>
            <Route exact path="/login" component=RedirectPage />
        </Switch>
    ) : (
        <Switch>
            <Route exact path="/home" component=Home />
            <Route exact path="/dashboard" component=Dashboard />
        </Switch>
    )
</Router>


【讨论】:

我正在试验您的建议以使其发挥作用。谢谢。【参考方案2】:

通常,您会希望某种“加载”或“不确定”状态表示既不经过身份验证也不表示未经身份验证。您可以使用这第三个“状态”来保存 UI,然后根据身份验证在任何事物上呈现一种或另一种方式。

由于您的 auth 逻辑解析为布尔值 true|false

const onAuthChange = (setState, setLoading) => 
  auth().onAuthStateChanged((u) => 
    if (!u) 
      console.log(u);
      setLoading(true);
     else 
      setState(u);
      setLoading(false);
    
  );
;

您可以使用初始auth 状态不是这两者的事实。我建议使用null

const [auth, setAuth] = useState<string | null>(null);

当使用auth 状态渲染Route 时,您可以增加逻辑以在决定重定向之前提前返回。

<Route
  path="/"
  render=() => 
    if (auth === null) return null;
    return <Redirect to=auth ? path : "/login" />;
  
/>

请注意,我也切换到了 render 属性,component 属性用于附加实际的 React 组件。这些处理方式略有不同。您可以阅读有关路由渲染方法的差异here。

完整的路由器示例:

<Router>
  <Switch>
    <Route path="/home" component=Home />
    <Route path="/dashboard" component=Dashboard />
    <Route path="/login" component=RedirectPage />
    <Route
      path="/"
      render=() => 
        if (auth === null) return null;
        return <Redirect to=auth ? path : "/login" />;
      
    />
  </Switch>
</Router>

请注意,我还包含了Switch 组件并重新排序了路由,因此在不太具体的路径之前列出了更具体的路径。这允许您从所有路由中删除不必要的 exact 属性,因为 Switch 仅呈现路由(相对于 Router 所做的包含性)。

【讨论】:

【参考方案3】:

我终于设法解决了这个问题。现在重新加载工作完美,安全性作为例外实施。这是我最后的Router

<Router>
      <Route
        path="/"
        render=() =>
          logging ? <Redirect to="/login" /> : <Redirect to=path />
        
      />
      <Route exact path="/" render=() => auth && <Home /> />
      <Route exact path="/dashboard" render=() => auth && <Dashboard /> />
      <Route exact path="/login" component=Login />
</Router>

这是组件现在的样子。

import 
  Route,
  BrowserRouter as Router,
  Link,
  Redirect
 from "react-router-dom";
import  Container, Button  from "@material-ui/core/";
import Login from "./Login";
import  useContext, useState, useEffect  from "react";
import  UserContext  from "../App";
import  signOut  from "../Storage/Auth";

const Routes = () => 
  const  auth, setAuth, logging  = useContext(UserContext);
  const handleSignOut = () => 
    signOut(setAuth);
    console.log("Auth", auth);
  ;
  const pathname = window.location.pathname;
  const [path, setPath] = useState(pathname);

  useEffect(() => 
    console.log(path);
    path === "/login" && setPath("/");
    path !== "/" && path !== "/dashboard" && setPath("/");
  , [auth]);

  const Home = () => 
    console.log("Home");
    return (
      <Container>
        <h1>Welcome</h1>
        <Link to="/">
          <Button onClick=handleSignOut> Log Out</Button>
        </Link>
        <Link to="/dashboard">
          <Button> Dash</Button>
        </Link>
      </Container>
    );
  ;

  const Dashboard = () => 
    console.log("Dash");
    return (
      <Container>
        <Link to="/">
          <Button> HOME</Button>
        </Link>
        <h1>Dashboard</h1>
      </Container>
    );
  ;

  return (
    <Router>
      <Route
        path="/"
        render=() =>
          logging ? <Redirect to="/login" /> : <Redirect to=path />
        
      />
      <Route exact path="/" render=() => auth && <Home /> />
      <Route exact path="/dashboard" render=() => auth && <Dashboard /> />
      <Route exact path="/login" component=Login />
    </Router>
  );
;

export  Routes ;

感谢@Richard 和@Drew 的支持。

【讨论】:

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