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[英]how to render the state array in react component. the array is available in state but while rendering its showing undefined
[英]How to make a react class component retain its state after login and change available routes based on the state currently available in the component?
我正在開發一個簡單的反應應用程序。 我的目標是,在用戶登錄之前,我只想讓用戶訪問用戶/登錄和/用戶/注冊 URL。因此,在身份驗證時,我正在更改路由。 目前我被路由到 /projects 頁面(新路由填充在應用程序中)但是在刷新時我被重定向到 /user/login。 有沒有一種方法可以做到這一點而不在本地存儲中保存任何內容? 誰能幫我解決這個問題?
import './App.css';
import LoginForm from './components/LoginForm/LoginForm'
import RegistrationForm from './components/RegistarationForm/RegistarationForm';
import Project from './components/Project/Project';
import {
BrowserRouter as Router,
Switch,
Route,
Redirect,
} from "react-router-dom";
import React, { Component } from 'react';
class App extends Component {
constructor(props) {
super(props);
this.state={
isUserAuthenticated: false
};
console.log('APP constructor');
}
// componentDidUpdate(prevProps) {
// console.log('update');
// }
authenticateUser=()=>{
this.setState({
isUserAuthenticated: true
});
}
render(){
var routes;
if(!this.state.isUserAuthenticated){
routes=<React.Fragment>
<Route exact path="/user/login" ><LoginForm authenticateUser={this.authenticateUser}/></Route>
<Route exact path="/user/register"><RegistrationForm /></Route>
<Route
render={() => <Redirect to={{pathname: "/user/login"}}/>}
/>
</React.Fragment>;
}else{
routes=<React.Fragment>
<Route exact path="/projects" ><Project /></Route>
<Route
render={() => <Redirect to={{pathname: "/projects"}}/>}
/>
</React.Fragment>;
}
return (
<Router>
<Switch>
{routes}
</Switch>
</Router>
);
}
}
export default App;
我是巴西人,因此我會說葡萄牙語,但我會使用翻譯來幫助您。
我真的不明白發生了什么,但我仍然認為您可以執行以下操作:
render() {
return (
<Router>
<Switch>
{!this.state.isUserAuthenticated ? (
<React.Fragment>
<Route exact path="/user/login">
<LoginForm authenticateUser={this.authenticateUser} />
</Route>
<Route exact path="/user/register">
<RegistrationForm />
</Route>
<Route
render={() => <Redirect to={{ pathname: "/user/login" }} />}
/>
</React.Fragment>
) : (
<React.Fragment>
<Route exact path="/projects">
<Project />
</Route>
<Route
render={() => <Redirect to={{ pathname: "/projects" }} />}
/>
</React.Fragment>
)}
</Switch>
</Router>
);
}
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