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React-router is not displaying component in the browser

Inside App.js:
import React, { useState } from 'react';
import './App.css';
import { BrowserRouter, Route, Routes } from 'react-router-dom';
import Dashboard from './components/Dashboard/Dashboard';
import Preferences from './components/Preferences/Preferences';
import Login from './components/Login/Login';
function App() {
const [token, setToken] = useState();
if(!token) {
return <Login setToken={setToken} />
}
return (
<div className="wrapper">
<h1>Application</h1>
<BrowserRouter>
<Routes>
/*<Route path="/dashboard">*/
<Route path="/dashboard" element={<Dashboard/>} /></Route>
/*<Route path="/preferences">*/
<Route path="/preferences" element={<Preferences/>} /></Route>
</Routes>
</BrowserRouter>
</div>
);
}
export default App;`
Inside Dashboard.js (../src/components/Dashboard/Dashboard.js):
import React from 'react';
export default function Dashboard() {
return(
<h2>Dashboard</h2>
);
}
Url: http://localhost:3000/dashboard
I want to see the Dashboard content along with the App page content (Application and Dashboard headers) when I load the browser. But when I load the browser, it only displays the App page content and getting the same error:
"Matched leaf route at location "/dashboard" does not have an element. This means it will render an <Outlet /> with a null value by default resulting in an "empty" page."

You are using Routes instead of Router. Replace it on your line 3 and in the return().
Source: React-router https://v5.reactrouter.com/web/api/Route
//...
import { BrowserRouter, Route, Router } from 'react-router-dom';
//...
return ( ...
<Router>
/*<Route path="/dashboard">*/
<Route path="/dashboard" element={<Dashboard/>} />
/*<Route path="/preferences">*/
<Route path="/preferences" element={<Preferences/>} />
</Router>
...)
export default App;

Please specify which version of React router you are using, since a lot of the functionality has changed, is it 6.4 or is still 5 ?
Either way, please remove the comments of the routes, I don't think they help at all.
if you have chosen BrowserRouter from the 6.4 version then it should be used like this
import { BrowserRouter, Route } from 'react-router-dom';
return (
<BrowserRouter>
<Route path="/" element={<RootComp />} >
<Route path="dashboard" element={<Dashboard/>} />
<Route path="preferences" element={<Preferences/>} />
</Route>
</BrowserRouter>
)
export default App;
Where <RootComp /> should have an <Outlet /> as children
import { Outlet } from 'react-router-dom';
const RootComp = () => {
return <div><Outlet /></div>
}
export default RootComp;
Again, this is for the latest React Router component, however, I would advise using createBrowserRouter() rather than the old component-based trees, this way you can programatically create and manage the routes in an Object.

how to get last part of pathname using useParams hook in react js

I'm trying to get the param part of this url: http://myapp.com/123 using this code:
import "./styles.css";
import { useParams } from "react-router-dom";
export default function App() {
const { id } = useParams();
console.log("id", id); // undefined. why??
return (
<div className="App">
<h1>Hello CodeSandbox</h1>
<h2>{id}</h2>
</div>
);
}
but somehow the id variable is undefined

Configure a router, something like this, the 2 dots and an identifying word.
path="movie/:id" or path="movie/:nameurl". Check which version of dom router you are using, you should use version 6, I have read their documentation and help. With what I said above it should be solved.
import { BrowserRouter as Router, Route, Routes } from "react-router-dom";
import GenresPage from "../pages/genres";
import Home from "../pages/home";
import Layout from "../pages/Layout";
import Movie from "../pages/movie";
export const AppRoutes = () => {
return (
<Router>
<Routes>
<Route path="/" element={<Layout />}>
<Route index element={<Home />} />
<Route path="movies" element={<GenresPage />} />
<Route path="movie/:id" element={<Movie />} />
</Route>
</Routes>
</Router>
);
};

React Router v4 - Nesting Routes Issue

I have the following App component.
class App extends React.Component {
constructor() {
super();
this.state = {}
}
// various methods that interact with state defined here
render() {
const Main = () => (
<div className="main-wrapper">
<ListPicker/>
<ListPane/>
</div>
);
const Search = () => (
<div className="search-wrapper">
<ul className="search-results">
<li>Search Results</li>
</ul>
</div>
);
return (
<div className="app-wrapper">
<Title/>
<SearchBar listResults={this.listResults}/>
<Route exact path="/" component={Main}/>
<Route path="/search" component={Search}/>
</div>
)
}
}
Which is rendered in index.js:
import React from 'react';
import { render } from 'react-dom';
import {
BrowserRouter as Router,
Route
} from 'react-router-dom';
import App from './components/App';
const Root = () => {
return (
<Router>
<div>
<Route exact path="/" component={App}/>
</div>
</Router>
)
};
render(<Root/>, document.getElementById('root'));
Towards the bottom of App you can see I'm trying to have either the Main component or Search component render below <Title/> and <SearchBar/> based on the paths / or /search. As far as I can tell from the React-Router docs, I'm doing what's shown in their example app, but I can't get this to work correctly. With this current setup Main renders fine at / but when navigating to /search nothing renders inside of <Root/>. I also tried wrapping those two <Routes/> in a <Switch/> but got the same result. Am I missing something?

You put a exact Route in you index.js. So the route /search can't find a way. So change to:
const Root = () => {
return (
<Router>
<div>
<Route path="/" component={App}/>
</div>
</Router>
)
};

React router - undefined history

I am trying to use the 1.0.0-rc1 react-router and history 2.0.0-rc1 to navigate manually through the website after pressing the button. Unfortunately, after pressing the button I get:
Cannot read property 'pushState' of undefined
My router code:
import React from 'react';
import { Router, Route, Link, browserHistory } from 'react-router'
import AppContainer from './components/AppContainer.jsx';
import MyTab from './components/test/MyTab.jsx';
import MainTab from './components/test/MainTab.jsx';
var routes = (
<Route component={AppContainer} >
<Route name="maintab" path="/" component={MainTab} />
<Route name="mytab" path="/mytab" component={MyTab} />
</Route>
);
React.render(<Router history={browserHistory}>{routes}</Router>, document.getElementById('main'));
The navigation button is on MyTab and it attemps to navigate to MainTab:
import React from 'react';
import 'datejs';
import History from "history";
export default React.createClass({
mixins: [ History ],
onChange(state) {
this.setState(state);
},
handleClick() {
this.history.pushState(null, `/`)
},
render() {
return (
<div className='container-fluid' >
<button type="button" onClick={this.handleClick.bind(this)}>TEST</button>
</div>
);
}
});
When I use history with this.props.history everything works fine. What is the problem with this code?
EDIT.
After adding the following:
const history = createBrowserHistory();
React.render(<Router history={history}>{routes}</Router>, document.getElementById('main'));
I try to access my app. Before (without history={history}), I just accessed localhost:8080/testapp and everything worked fine - my static resources are generated into dist/testapp directory. Now under this URL I get:
Location "/testapp/" did not match any resources
I tried to use the useBasename function in a following way:
import { useBasename } from 'history'
const history = useBasename(createBrowserHistory)({
basename: '/testapp'
});
React.render(<Router history={history}>{routes}</Router>, document.getElementById('main'));
and the application is back, but again I get the error
Cannot read property 'pushState' of undefined
in the call:
handleClick() {
this.history.pushState(null, `/mytab`)
},
I thougt it may be because of my connect task in gulp, so I have added history-api-fallback to configuration:
settings: {
root: './dist/',
host: 'localhost',
port: 8080,
livereload: {
port: 35929
},
middleware: function(connect, opt){
return [historyApiFallback({})];
}
}
But after adding middleware all I get after accessing a website is:
Cannot GET /

As of "react-router": "^4.1.1", you may try the following:
Use 'this.props.history.push('/new-route')'. Here's a detailed example
1: Index.js
import { BrowserRouter, Route, Switch } from 'react-router-dom';
//more imports here
ReactDOM.render(
<div>
<BrowserRouter>
<Switch>
<Route path='/login' component={LoginScreen} />
<Route path='/' component={WelcomeScreen} />
</Switch>
</BrowserRouter>
</div>, document.querySelector('.container'));
Above, we have used BrowserRouter, Route and Switch from 'react-router-dom'.
So whenever you add a component in the React Router 'Route', that is,
<Route path='/login' component={LoginScreen} />
..then 'React Router' will add a new property named 'history' to this component (LoginScreen, in this case). You can use this history prop to programatically navigate to other rountes.
So now in the LoginScreen component you can navigate like this:
2: LoginScreen:
return (
<div>
<h1> Login </h1>
<form onSubmit={this.formSubmit.bind(this)} >
//your form here
</form>
</div>
);
formSubmit(values) {
// some form handling action
this.props.history.push('/'); //navigating to Welcome Screen
}

Because everything changes like hell in react world here's a version which worked for me at December 2016:
import React from 'react'
import { Router, ReactRouter, Route, IndexRoute, browserHistory } from 'react-router';
var Main = require('../components/Main');
var Home = require('../components/Home');
var Dialogs = require('../components/Dialogs');
var routes = (
<Router history={browserHistory}>
<Route path='/' component={Main}>
<IndexRoute component={Home} />
<Route path='/dialogs' component={Dialogs} />
</Route>
</Router>
);
module.exports = routes

To create browser history you now need to create it from the History package much like you've tried.
import createBrowserHistory from 'history/lib/createBrowserHistory';
and then pass it to the Router like so
<Router history={createBrowserHistory()}>
<Route />
</Router>
The docs explain this perfectly

React Router only recognises index route

I have 2 routes, / and /about and i've tested with several more. All routes only render the home component which is /.
When I try a route that doesn't exist it recognises that fine and displays the warning
Warning: No route matches path "/example". Make sure you have <Route path="/example"> somewhere in your routes
App.js
import React from 'react';
import Router from 'react-router';
import { DefaultRoute, Link, Route, RouteHandler } from 'react-router';
import {Home, About} from './components/Main';
let routes = (
<Route name="home" path="/" handler={Home} >
<Route name="about" handler={About} />
</Route>
);
Router.run(routes, function (Handler) {
React.render(<Handler/>, document.body);
});
./components/Main
import React from 'react';
var Home = React.createClass({
render() {
return <div> this is the main component </div>
}
});
var About = React.createClass({
render(){
return <div>This is the about</div>
}
});
export default {
Home,About
};
I've tried adding an explicit path to about to no avail.
<Route name="about" path="/about" handler={About} />
I've stumbled upon this stackoverflow Q but found no salvation in its answer.
Can anyone shed some light on what might be the problem?

Using ES6 and the newest react-router would look like this:
import React from 'react';
import {
Router,
Route,
IndexRoute,
}
from 'react-router';
const routes = (
<Router>
<Route component={Home} path="/">
<IndexRoute component={About}/>
</Route>
</Router>
);
const Home = React.createClass({
render() {
return (
<div> this is the main component
{this.props.children}
</div>
);
}
});
//Remember to have your about component either imported or
//defined somewhere
React.render(routes, document.body);
On a side note, if you want to match unfound route to a specific view, use this:
<Route component={NotFound} path="*"></Route>
Notice the path is set to *
Also write your own NotFound component.
Mine looks like this:
const NotFound = React.createClass({
render(){
let _location = window.location.href;
return(
<div className="notfound-card">
<div className="content">
<a className="header">404 Invalid URL</a >
</div>
<hr></hr>
<div className="description">
<p>
You have reached:
</p>
<p className="location">
{_location}
</p>
</div>
</div>
);
}
});

Since you've nested About under Home you need to render a <RouteHandler /> component within your Home component in order for React Router to be able to display your route components.
import {RouteHandler} from 'react-router';
var Home = React.createClass({
render() {
return (<div> this is the main component
<RouteHandler />
</div>);
}
});