在组件中使用 useSelector() 的结果

Question

我正在使用 react-redux 来管理状态和 axios 来进行 API 调用。

我的默认状态：

const defaultState = {
    isLoading: true,
    isAuthenticated: false,
    authUser: {}
}

一旦 API 的登录调用成功运行，isLoading 和 authUser 都会更新。这里没有错。

在 userProfile 组件中，我使用以下内容从商店获取登录用户的 ID：

const authUser = useSelector(state => state.authentication.authUser);

const user = users.getUser(authUser.id);
console.log(authUser);

authUser 在页面加载时始终为空，但迟了一秒，它再次打印，这次是状态内容。

我在自定义 PrivateRoute 组件后面有 userProfile 组件：

const PrivateRoute = ({ component: Component, ...rest }) => {
    const authentication = useSelector(state => state.authentication);
    
    return (
        <Route
            {...rest}
            render={props =>
                authentication.isAuthenticated ? (
                    <Component {...props} />
                ) : (
                    authentication.isLoading ? 'loading...' :
                        <Redirect to={{ pathname: '/login', state: { from: props.location } }} />
                )
            }
        />
    )
};

loading... 文本在组件赶上之前显示，然后 2 个控制台日志一个接一个地出现。第一个为空，第二个为数据。

我在这里缺少什么？这种异步的东西快把我逼疯了！

Answer 1

---

通过这种私有路由的实现，你可以保存用户的当前路径，让用户在再次登录后继续他的进程

import React from 'react';
import { Login } from '../../pageComponents';
import { useSelector } from 'react-redux';

const PrivateRoute = (Component) => {
const Auth = (props) => {
    const { isLoggedIn } = useSelector((state) => state.user);
    // Login data added to props via redux-store (or use react context for example)
    // If user is not logged in, return login componentc
    if (!isLoggedIn) {
        return <Login />;
    }
    // If user is logged in, return original component
    return <Component {...props} />;
};

// Copy getInitial props so it will run as well
if (Component.getInitialProps) {
    Auth.getInitialProps = Component.getInitialProps;
}

return Auth;
};

export default PrivateRoute;

---

然后像下面这样使用你想要 Private Rout 的每个页面

const myPrivateRoute = () => {
    return (
        <h1>Hello world</h1>
     )
}

export default PrivateRoute(myPrivateRoute)

Answer 2

---

所以创建这样的组件并从本地存储或 cookie 加载您的最后一部分，然后验证并发送到您的 redux 存储，然后您可以记住日志

import { useEffect, useState } from "react";
import { useSelector, useDispatch } from "react-redux";
import axios from "axios";
import * as globalActions from "../../../store/actions/globalAction";
import * as userAction from "../../../store/actions/userAction";
const StorageManagment = () => {
const dispatch = useDispatch();
/* ----------------------------------- listening to token changes ----------------------------------- */

useEffect(() => {
    dispatch(userAction.loadCart());
}, []);
useEffect(async () => {
    try {
        if (window)
            await checkLocalDataWithRedux()
                .then((data) => {
                    const { userDTO, token } = data;
                    dispatch(userAction.loginUser(token, userDTO));
                })
                .catch((e) => {
                    console.log(e);
                    dispatch(userAction.logOutUser());
                });
    } catch (e) {
        throw e;
    }
}, []);

function checkLocalDataWithRedux() {
    return new Promise((resolve, reject) => {
        try {
            /* -------- read user data from localStorage and set into redux store ------- */
            const { userDTO, token } = localStorage;
            if (userDTO && token) {
                resolve({ token: token, userDTO: JSON.parse(userDTO) });
            } else logOutUser();
        } catch (e) {
            reject();
        }
    });
}

function logOutUser() {
    dispatch(userAction.logOutUser());
}

return null;
};

export default StorageManagment;

---

然后将其加载到您的 app.jsx 文件中

app.js

render() {
    return (
        <React.Fragment>
            <Provider store={store}>
                <ErrorBoundary>
                    <StorageManagment />
                    <DefaultLayout>
                        <Application {...this.props} />
                    </DefaultLayout>
                </ErrorBoundary>
            </Provider>
        </React.Fragment>
    );
}