当我使用重定向时，为什么我的组件不会重新呈现？

Question

我正在使用 Laravel API 在 React 中进行身份验证，除了一些路由器问题外，一切正常。

我有条件地呈现这样的重定向：

if (this.state.redirect) {
         return <Redirect to="/home" />;
         }
         const login = localStorage.getItem("isLoggedIn");
         if (login) {
           return <Redirect to="/home" />;
           
        }

应用程序.js

    export default class App extends Component {
  render() {
    let navLink = (
      <div className="Tab">
        <NavLink to="/sign-in" activeClassName="activeLink" className="signIn">
          Sign In
        </NavLink>
        <NavLink exact to="/" activeClassName="activeLink" className="signUp">
          Sign Up
        </NavLink>
      </div>
    );
    const login = localStorage.getItem("isLoggedIn");

    return (
      <div className="App">
        {login ? (
          <Router>
            <Route exact path="/" component={Signup}></Route>
            <Route path="/sign-in" component={Signin}></Route>
            <Route path="/home" component={Home}></Route>
          </Router>
        ) : (
          <Router>
            {navLink}
            <Route exact path="/" component={Signup}></Route>
            <Route path="/sign-in" component={Signin}></Route>
            <Route path="/home" component={Home}></Route>
          </Router>
        )}
      </div>
    );
  }
}

登录.js

export default class Signin extends Component {
  constructor(props) {
    super(props);
    this.state = {
      email: "",
      password: "",
      msg: "",
      isLoading: false,
      redirect: false,
      errMsgEmail: "",
      errMsgPwd: "",
      errMsg: "",
    };
  }
  onChangehandler = (e) => {
    let name = e.target.name;
    let value = e.target.value;
    let data = {};
    data[name] = value;
    this.setState(data);
  };

  onSignInHandler = () => {
    this.setState({ isLoading: true });
    axios
      .post("http://localhost:8000/api/user-login", {
        email: this.state.email,
        password: this.state.password,
      })
      .then((response) => {
        this.setState({ isLoading: false });
        if (response.data.status === 200) {
            localStorage.setItem("isLoggedIn", true);
            localStorage.setItem("userData", JSON.stringify(response.data.data));
          this.setState({
            msg: response.data.message,
            redirect: true,
          }); 
        }
        if (
          response.data.status === "failed" &&
          response.data.success === undefined
        ) {
          this.setState({
            errMsgEmail: response.data.validation_error.email,
            errMsgPwd: response.data.validation_error.password,
          });
          setTimeout(() => {
            this.setState({ errMsgEmail: "", errMsgPwd: "" });
          }, 2000);
        } else if (
          response.data.status === "failed" &&
          response.data.success === false
        ) {
          this.setState({
            errMsg: response.data.message,
          });
          setTimeout(() => {
            this.setState({ errMsg: "" });
          }, 2000);
        }
      })
      .catch((error) => {
        console.log(error);
      });
  };

  render() {
   if (this.state.redirect) {
     return <Redirect to="/home" />;
     }
     const login = localStorage.getItem("isLoggedIn");
     if (login) {
       return <Redirect to="/home" />;
       
    }
    const isLoading = this.state.isLoading;
    return (
      <div>
        <Form className="containers">
          <FormGroup>
            <Label for="email">Email id</Label>
            <Input
              type="email"
              name="email"
              placeholder="Enter email"
              value={this.state.email}
              onChange={this.onChangehandler}
            />
            <span className="text-danger">{this.state.msg}</span>
            <span className="text-danger">{this.state.errMsgEmail}</span>
          </FormGroup>
          <FormGroup>
            <Label for="password">Password</Label>
            <Input
              type="password"
              name="password"
              placeholder="Enter password"
              value={this.state.password}
              onChange={this.onChangehandler}
            />
            <span className="text-danger">{this.state.errMsgPwd}</span>
          </FormGroup>
          <p className="text-danger">{this.state.errMsg}</p>
          <Button
            className="text-center mb-4"
            color="success"
            onClick={this.onSignInHandler}
          >
            Sign In
            {isLoading ? (
              <span
                className="spinner-border spinner-border-sm ml-5"
                role="status"
                aria-hidden="true"
              ></span>
            ) : (
              <span></span>
            )}
          </Button>
        </Form>
      </div>
    );
  }
}

注册.js

export default class Signup extends Component {
  userData;
  constructor(props) {
    super(props);
    this.state = {
      signupData: {
        name: "",
        email: "",
        phone: "",
        password: "",
        isLoading: "",
      },
      msg: "",
    };
  }

  onChangehandler = (e, key) => {
    const { signupData } = this.state;
    signupData[e.target.name] = e.target.value;
    this.setState({ signupData });
  };
  onSubmitHandler = (e) => {
    e.preventDefault();
    this.setState({ isLoading: true });
    axios
      .post("http://localhost:8000/api/user-signup", this.state.signupData)
      .then((response) => {
        this.setState({ isLoading: false });
        if (response.data.status === 200) {
          this.setState({
            msg: response.data.message,
            signupData: {
              name: "",
              email: "",
              phone: "",
              password: "",
            },
          });
          setTimeout(() => {
            this.setState({ msg: "" });
          }, 2000);
        }

        if (response.data.status === "failed") {
          this.setState({ msg: response.data.message });
          setTimeout(() => {
            this.setState({ msg: "" });
          }, 2000);
        }
      });
  };
  render() {
    const isLoading = this.state.isLoading;
    return (
      <div>
        <Form className="containers shadow">
          <FormGroup>
            <Label for="name">Name</Label>
            <Input
              type="name"
              name="name"
              placeholder="Enter name"
              value={this.state.signupData.name}
              onChange={this.onChangehandler}
            />
          </FormGroup>
          <FormGroup>
            <Label for="email">Email id</Label>
            <Input
              type="email"
              name="email"
              placeholder="Enter email"
              value={this.state.signupData.email}
              onChange={this.onChangehandler}
            />
          </FormGroup>
          <FormGroup>
            <Label for="phone">Phone Number</Label>
            <Input
              type="phone"
              name="phone"
              placeholder="Enter phone number"
              value={this.state.signupData.phone}
              onChange={this.onChangehandler}
            />
          </FormGroup>
          <FormGroup>
            <Label for="password">Password</Label>
            <Input
              type="password"
              name="password"
              placeholder="Enter password"
              value={this.state.signupData.password}
              onChange={this.onChangehandler}
            />
          </FormGroup>
          <p className="text-white">{this.state.msg}</p>
          <Button
            className="text-center mb-4"
            color="success"
            onClick={this.onSubmitHandler}
          >
            Sign Up
            {isLoading ? (
              <span
                className="spinner-border spinner-border-sm ml-5"
                role="status"
                aria-hidden="true"
              ></span>
            ) : (
              <span></span>
            )}
          </Button>
          <Link to="/sign-in" className="text-white ml-5">I'm already member</Link>
        </Form>
      </div>
    );
  }
}

我的问题是 {navLink} 组件在登录与否的两种情况下仍然呈现！ 但是当我手动刷新页面时它就会消失！

图片

Answer 1

我在这方面有一些经验，所以我分享给你也许对你有帮助。

创建一个受保护的根

export const ProtectedRoute = (props) => {
  let redirectPath = "";
  if (!localStorage.getItem("isLoggedIn")) {
    redirectPath = props.authenticationPath;
  }

  if (redirectPath) {
    const renderComponent = () => <Redirect to={{ pathname: redirectPath }} />;
    return <Route {...props} component={renderComponent} render={undefined} />;
  } else {
    return <Route {...props} />;
  }
};

在路由器组件上像这样使用它：

<ProtectedRoute
     exact
     path="/profile"
     component={Profile}
     restrictedPath="/profile"
     authenticationPath="/login"
/>

提交登录表单或注册表单后

history.push("/profile")

我确实在codeandbox上做了一个小例子，你需要开始，希望它有帮助。