我在我的应用程序中使用带有 thunk 的 react 路由器 v4 进行路由。
我想阻止渲染 <AccountPage />
组件给未登录的用户。我在服务器上发送带有 id 和 token 的 fetch 请求以 checkin 数据库,用户是否有此 token 。如果有 - 渲染 <AccountPage />
,如果不是 - 重定向回家。
我不明白什么是实现“条件路由”的好方法,我发现一些似乎几乎完全适合我的任务的东西。https://gist.github.com/kud/6b722de9238496663031dbacd0412e9d
但问题是 condition
在 <RouterIf />
总是未定义的,因为 fetch 是异步的。我处理这个异步的尝试没有任何结果或错误:
Objects are not valid as a React child (found: [object Promise]) ...
或者
RouteIf(...): Nothing was returned from render. ...
这是代码:
//RootComponent
<BrowserRouter>
<Switch>
<Route exact path='/' component={HomePage}/>
<Route path='/terms' component={TermsAndConditionsPage}/>
<Route path='/transaction(\d{13}?)' component={TransactionPage}/>
<RouteIf
condition={( () => {
if( store.getState().userReducer.id, store.getState().userReducer.token) {
// Here i sending id and token on server
// to check in database do user with this id
// has this token
fetch(CHECK_TOKEN_API_URL, {
method: 'post',
headers: {'Accept': 'application/json', 'Content-Type': 'application/json'},
body: JSON.stringify({
id: store.getState().userReducer.id,
token: store.getState().userReducer.token
})
})
.then res => {
// If true – <RouteIf /> will render <AccountPage />,
// else - <Redirect to="/">
// But <RouteIf /> mounts without await of this return
// You can see RouteIf file below
if(res.ok) return true
else return false
})
}
})()}
privateRoute={true}
path="/account"
component={AccountPage}
/>
</Switch>
</BrowserRouter>
//RouteIf.js
const RouteIf = ({ condition, privateRoute, path, component }) => {
// The problem is that condition is
// always undefined, because of fetch's asyncronosly
// How to make it wait untill
// <RouteIf condition={...} /> return result?
return condition
? (<PrivateRoute path={path} component={component} />)
:(<Redirect to="/" />)
}
export default RouteIf
制作方法
condition
等到fetch
返回答案?或者也许还有另一种更好的方法来检查用户是否登录?
最佳答案
如果您使用的是 redux,您可以显示临时的“正在加载...” View 。仅当用户为 null 并已加载时,才会重定向路由。
PrivateRoute.js
import React from 'react';
import PropTypes from 'prop-types';
import { useSelector } from 'react-redux';
import { Route, Redirect } from 'react-router-dom';
import { selectors } from 'settings/reducer';
const PrivateRoute = ({ component: Component, ...rest }) => {
const user = useSelector(state => selectors.user(state));
const isLoaded = useSelector(state => selectors.isLoaded(state));
return (
<Route
{...rest}
render={props =>
!isLoaded ? (
<></>
) : user ? (
<Component {...props} />
) : (
<Redirect to='/sign_in' />
)
}
/>
);
};
export default PrivateRoute;
PrivateRoute.propTypes = {
component: PropTypes.any
};
路由.js
import React from 'react';
import { BrowserRouter, Route, Switch } from 'react-router-dom';
import PrivateRoute from './components/PrivateRoute';
export const Routes = () => (
<BrowserRouter>
<Switch>
<Route exact={true} path='/' component={Home} />
<PrivateRoute path='/account' component={Account} />
</Switch>
</BrowserRouter>
);
关于reactjs - 使用react。具有异步获取请求的私有(private)路由器,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/49309071/