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仅当我刷新页面时读取道具数据

react-router-dom react-redux reactjs

abhay · 技术社区 · 5 年前

我正在使用功能组件的React。当我登录时,我使用 history.push('/dashboard') 。当我在仪表板页面上记录控制台日志时,它会显示仪表板中的所有可用数据 props .但数据不会呈现在页面上,它显示 "Uncaught (in promise) TypeError: Cannot read property 'profile' of undefined" .当我刷新页面或使用 { forceRefresh:true } 历史上一切都很顺利。

边栏组件:

import React,{useEffect} from 'react';
import { Link,withRouter } from 'react-router-dom';
import { connect } from 'react-redux';
import { userActions } from '../../../_actions/users'
import {
    Sidebar,
    UncontrolledButtonDropdown,
    Avatar,
    AvatarAddOn,
    DropdownToggle,
    DropdownMenu,
    DropdownItem
} from './../../../components';

function SidebarTopA(props) {
    const { authentication } = props
    function logout(){
        return (e)=>props.logout()
    }
    return (
        <React.Fragment>
            { /* START: Sidebar Default */}
            <Sidebar.HideSlim>
                <Sidebar.Section className="pt-0">
                    <Link to="/" className="d-block">
                        <Sidebar.HideSlim>
                            <Avatar.Image
                                size="lg"
                                src={authentication.user.user.profile.profile_photo}
                                addOns={[
                                    <AvatarAddOn.Icon
                                        className="fa fa-circle"
                                        color={authentication.loggedIn ? "success" :"warning"}
                                        key="avatar-icon-fg"
                                    />
                                ]}
                            />
                        </Sidebar.HideSlim>
                    </Link>

                    <UncontrolledButtonDropdown>
                        <DropdownToggle color="link" className="pl-0 pb-0 btn-profile sidebar__link">
           {authentication.user.user.first_name} {authentication.user.user.last_name}
                            <i className="fa fa-angle-down ml-2"></i>
                        </DropdownToggle>
                        <DropdownMenu persist>
                            <DropdownItem header>
                            {authentication.user.user.email}
                            </DropdownItem>
                            <DropdownItem divider />
                            <DropdownItem tag={Link} to="/apps/profile-details">
                                <i className="fa fa-fw fa-user mr-2"></i>
                    Your Profile
                    </DropdownItem>
                            <DropdownItem divider />
                            <DropdownItem tag={Link} to="/" onClick={logout()}>
                                <i className="fa fa-fw fa-sign-out mr-2"></i>
                        Sign Out
                    </DropdownItem>
                        </DropdownMenu>
                    </UncontrolledButtonDropdown>
                    <div className="small sidebar__link--muted">
                    {authentication.user.user.profile.job_title}
                    </div>
                </Sidebar.Section>
            </Sidebar.HideSlim>
            { /* END: Sidebar Default */}

            { /* START: Sidebar Slim */}
            <Sidebar.ShowSlim>
                <Sidebar.Section>
                    <Avatar.Image
                        size="sm"
                        src={authentication.user.user.profile.profile_photo} 
                        addOns={[
                            <AvatarAddOn.Icon
                                className="fa fa-circle"
                                color="white"
                                key="avatar-icon-bg"
                            />,
                            <AvatarAddOn.Icon
                                className="fa fa-circle"
                                color="success"
                                key="avatar-icon-fg"
                            />
                        ]}
                    />
                </Sidebar.Section>
            </Sidebar.ShowSlim>
            { /* END: Sidebar Slim */}
        </React.Fragment>

    );

}

function mapState(state) {
    const { authentication } = state
    return { authentication };
}
const actionCreators = {
    logout: userActions.logout
}
const connectedHomePage = withRouter(connect(mapState, actionCreators)(SidebarTopA));
export { connectedHomePage as SidebarTopA };

0 回复 | 直到 5 年前

Louis Coulet 5 年前

在渲染SidebarTopA时,配置文件信息似乎不可用。
我建议你保护它,并摆脱它。
将此项添加到SidebarTopA中,位于现有报税表之上(并去掉forceRefresh):

if(!authentication.user || !authentication.user.user || !authentication.user.user.profile){
    return "Loading user profile, please wait..."
}

abhay 5 年前

最后,我使用redux persist包解决了这个问题。

我的店铺设置是:

import { createStore, applyMiddleware } from 'redux';
import thunkMiddleware from 'redux-thunk';
import { createLogger } from 'redux-logger';
import rootReducer from '../_reducers';
import { composeWithDevTools  } from 'redux-devtools-extension';
import { persistStore, persistReducer } from 'redux-persist'
import storage from 'redux-persist/lib/storage'
const persistConfig = {
    key: 'chedsk',
    storage,
  }
const loggerMiddleware = createLogger();

const persistedReducer = persistReducer(persistConfig, rootReducer)
 
const composeEnhancers = composeWithDevTools({trace: true, traceLimit: 20});
export const store = createStore(
    persistedReducer,composeEnhancers( applyMiddleware(
        thunkMiddleware,
        loggerMiddleware
    ))
   
)
export const persistor = persistStore(store)

我喜欢应用程序内组件。

import { store, persistor } from './_helpers/store';
import { PersistGate } from 'redux-persist/integration/react'
render(
    <Provider store={store}>
        <PersistGate loading={null} persistor={persistor}>
            <App />
        </PersistGate>
    </Provider>,
    document.querySelector('#root')
);