React noob here, I'm trying to add a link in my material-ui toolbar using React-router v4 to the home page but I keep getting the error:
Element type is invalid: expected a string (for built-in components)
or a class/function (for composite components) but got: undefined. You
likely forgot to export your component from the file it's defined in.
Check the render method of LandingToolBar.
I'm trying to copy the basic example here https://reacttraining.com/react-router/web/example/basic but instead putting the top list in another component called LandingToolBar but I can't see to get it to work. Here is my index.js:
import React from 'react'
import ReactDOM from 'react-dom'
import App from './App'
import injectTapEventPlugin from 'react-tap-event-plugin'
import MuiThemeProvider from 'material-ui/styles/MuiThemeProvider';
injectTapEventPlugin();
ReactDOM.render(
<MuiThemeProvider>
<App />
</MuiThemeProvider>,
document.getElementById('app')
);
My app.js:
import React from 'react'
import {Route, BrowserRouter, Switch} from 'react-router-dom'
import LoginPage from "./containers/LoginPage";
import SignUpPage from "./containers/SignUpPage";
import HomePage from "./components/landing/HomePage";
import LandingToolBar from "./components/landing/LandingToolBar";
class App extends React.Component {
render() {
return (
<BrowserRouter>
<div>
<LandingToolBar/>
<Switch>
<Route path="/" exact component={HomePage}/>
<Route path="/login" component={LoginPage}/>
<Route path="/signup" component={SignUpPage}/>
</Switch>
</div>
</BrowserRouter>
)
}
}
export default App;
And the toolbar component LandingToolBar that I'm trying to render always:
import React from 'react';
import Link from 'react-router-dom';
import {ToolbarGroup, ToolbarTitle, RaisedButton, Toolbar} from 'material-ui'
const LandingToolBar = () => (
<Toolbar>
<ToolbarGroup>
<ToolbarTitle text="ETFly"/>
<Link to="/">feafeaf</Link>
</ToolbarGroup>
</Toolbar>
);
export default LandingToolBar;
Struggling pretty hard with the routing part as there doesn't seem to be much explanation in the docs or for v4 stuff...
Thanks for the help!
You need to import the Link like this, its a named import not default import:
import {Link} from 'react-router-dom';
Check this answer for named vs default import/export.
Related
When I try to render the "Home" component it just doesn't show anything... The path is correct, and the Router imports should be fine too. What am I missing? It worked on another project of mine and even if I copy and paste that code it doesn't seem to work.
App.js:
import React from "react";
import Home from "./components/Home"
import {BrowserRouter as Router, Route, Routes} from "react-router-dom"
function App() {
return (
<Router>
<Routes>
<Route exact path="/" element={<Home/>}/>
</Routes>
</Router>
);
}
export default App;
Home.js:
import React from 'react'
function Home() {
return (
<div>Home</div>
)
}
export default Home
index.js:
import React from 'react';
import ReactDOM from 'react-dom/client';
import './index.css';
import App from './App';
import reportWebVitals from './reportWebVitals';
const root = ReactDOM.createRoot(document.getElementById('root'));
root.render(
<React.StrictMode>
<App />
</React.StrictMode>
);
reportWebVitals();
I expected the "Home" component to be rendered as soon as I load the page, but it wasn't (Blank page). I checked if I imported it incorrectly, but as soon as I delete the "Router" and "Routes" tags as well as the Route itself and just try to render the "Home" component on its own, it works.
It's probably something really small that I'm missing but I can't seem to figure it out right now.
Using Route requires Switch component which means you'll do the following:
import React from "react";
import Home from "./components/Home"
import {BrowserRouter as Router, Route, Routes, Switch} from "react-router-dom"
function App() {
return (
<Switch>
<Route exact path="/" >
<Home/>
</Route>
</Switch>
);
}
export default App;
This question already has answers here:
React Router Dom routes are returning blank pages
(2 answers)
Closed 8 months ago.
I'm following along with this React Tutorial on YouTube but I can't get my routes to render on own dev server.
This is what my home screen is rendering. My home screen should show a pink background underneath the navigation bar.
I suspect the error is happening in this section of my App.js code, since everything else outside of works fine:
<Routes>
<Route exact path="/" component={HomeScreen}/>
</Routes>
I'm using react-router-dom v6.3.0
My App.js code:
import './App.css';
import { useState } from "react";
import { BrowserRouter as Router, Routes, Route} from "react-router-dom";
// Screens
import HomeScreen from './screens/HomeScreen';
// Components
import Navbar from './components/Navbar';
import SideDrawer from './components/SideDrawer';
import Backdrop from './components/Backdrop';
function App() {
const [sideToggle, setSideToggle] = useState(false);
return (
<Router>
<Navbar click={() => setSideToggle(true)} />
<SideDrawer show={sideToggle} click={() => setSideToggle(false)} />
<Backdrop show={sideToggle} click={() => setSideToggle(false)} />
<main>
<div className="app">This is a test</div>
<Routes>
<Route exact path="/" component={HomeScreen}/>
</Routes>
</main>
</Router>
);
}
export default App;
My index.js code:
import React from "react";
import ReactDOM from "react-dom";
import "./index.css";
import App from "./App";
import reportWebVitals from "./reportWebVitals";
ReactDOM.render(
<React.StrictMode>
<App />
</React.StrictMode>,
document.getElementById("root")
);
reportWebVitals();
My HomeScreen code:
import "./HomeScreen.css";
const HomeScreen = () => {
return (
<div className="homescreen">
Home Screen
</div>
)
}
export default HomeScreen
Hope someone's able to give some advice to a React newbie?
Please let me know if I need to provide more info.
Wen, If you are using react-router-dom v6.3.0. then you have to use
<Routes>
<Route exact path="/" element={<HomeScreen/>}/>
</Routes>
I think there is your error:
import React from "react"; import { BrowserRouter} from "react-router-dom"; import ReactDOM from "react-dom";import "./index.css";import App from "./App";import reportWebVitals from "./reportWebVitals";ReactDOM.render(<React.StrictMode>BrowserRouter><App>BrowserRouter>React.StrictMode>,document.getElementById("root")reportWebVitals();
you need to cover app component in browserouter if it doesn't work than update your react-router-dom ande try thise simple docs
It should be element, not component, that property that renders a component for a Route, and the component should be called:
<Route exact path="/" component={<HomeScreen/>}/>
What you have there is for React Router Dom v5.
I have the following ReactJS project structure and I'm getting the following error:
./src/index.js
Attempted import error: './components' does not contain a default export (imported as 'App').
My goal is to import components like this: import { App, Navbar } from 'components'; (notice the 'components') and not like ./components/App, ./components/App/index or so. To do that, I needed to add index.js in the components directory. I tried doing that by the following code, but I'm receiving the error above.
What's the reason? How do I solve it?
There are similar threads, but I'm already exporting it by export default App; in ./components/App/index.jsx. Maybe the reason is the .jsx extension?
index.js
import React from 'react';
import ReactDOM from 'react-dom';
import './index.css';
import App from './components';
import * as serviceWorker from './serviceWorker';
ReactDOM.render(<App />, document.getElementById('root'));
serviceWorker.unregister();
components/index.js
export App from './App';
components/App/index.jsx
import React, { Fragment } from 'react';
import './style.css';
import { BrowserRouter as Router, Switch, Route, Redirect } from 'react-router-dom';
import NotAuthorizedRoute from '../../common/NotAuthorizedRoute';
import { Navbar, Home, User, Login } from 'components';
const App = () => {
return (
<Fragment>
<Router>
<Navbar />
<Switch>
<Route exact path="/" component={Home} />
<Route path="/users" component={User} />
<NotAuthorizedRoute path="/sign-in" component={Login} />
<Redirect from="*" to="/" />
</Switch>
</Router>
</Fragment>
);
};
export default App;
components/App/style.css
What I tried:
I tried doing the following, like people said in this thread: Attempted import error: 'App' is not exported from './App'.
components/index.js
export { App } from './App'; // note the brackets
But then I got:
./src/components/index.js
Attempted import error: 'App' is not exported from './App'.
It seems you are having some confusions with ES6 export/import syntaxes. MDN documentation is very explicative, I would recommend you to check it.
The most important thing is to remember the difference between default and named export/import. (HINT: When you see brackets in export/import statements you are dealing with named ones)
In your specific case, you will have to do as follows:
./components/component-a.jsx
const ComponentA = () => {
return (
<MyComponent/>
);
};
export {ComponentA};
./components/component-b.jsx
const ComponentB = () => {
return (
<MyComponent/>
);
};
export {ComponentB};
./components/index.js
import {componentA} from './component-a.jsx';
import {componentB} from './component-b.jsx';
export {componentA, componentB};
./some-file.jsx
import {componentA, componentB} from './components';
./some-other-file.jsx
import {componentA} from './components';
This is the typical pattern to create a virtual export/import namespace for logical module classification.
Please note that I've not used default exports. There are several opinions about this, but I would recommend to not use them to avoid errors like the one you are having.
Please also note that you'll always have to specify the full relative path to the components directory. The only way to import things from 'components' is by having a components package installed in your node_modules directory.
Make sure you are not using the exported value componentA in {componentA}
remove `{}` and check
I'm newbie in reactjs, I tried build something with it but I had problem with react-router-redux. I get React.createElement: type is invalid -- expected a string (for built-in components) or a class/function (for composite components) but got: undefined. in console. Here is my code :
App.js
import React, { PropTypes } from 'react';
class App extends React.Component {
render() {
return (
<div>
{this.props.children}
</div>
);
}
}
export default App;
Routes.js
import React from 'react';
import { Route, IndexRoute } from 'react-router'
import App from './components/App';
import Login from './components/login/Login';
import Register from './components/register/Register';
export default (
<Route path="/" component={App}>
<IndexRoute component={Login}/>
<Route path="register" component={Register}/>
</Route>
);
And Index.js
...
import { syncHistoryWithStore } from 'react-router-redux'
import { Router } from 'react-router'
import { createBrowserHistory } from 'history';
import routes from './routes';
const store = configureStore();
const history = syncHistoryWithStore(createBrowserHistory(), store)
ReactDOM.render(
<Provider store={store}>
<Router history={history} routes={routes}>
</Router>
</Provider>,
document.getElementById('app')
);
Where is my wrong? Please explain for me why I get this error. Thank in advance
React-router-redux is no longer maintained and support only 3.x and 2.x React-router versions
Repo authors suggest using connected-react-router for React-rotuer 4.x bindings
There are different routers for different environments, you want to use BrowserRouter instead of Router.
See React Training BrowserRouter for more information.
index.js
// change this line
import { Router } from 'react-router';
// to
import { BrowserRouter as Router } from 'react-router-dom';
NOTE: You might also have to pass in your routes in a different way. This is shown in the React Training page provided above.
I am trying to set a basic example of react router where I have two simple routes, greetings and signup, under a template setup. Currently, I am not getting any errors on load, however, when trying to access the /signup route by typing it in to the address bar, I am getting the following error: Cannot GET /signup and I am having trouble understanding why.
Did anyone else run into this issue with react-router-dom v4? I appreciate any suggestions on how to resolve this issue and allow the successful navigation to different paths via URL.
Note, if I try to access these url paths using the built in react Link component and clicking on the link, its works as expected, but when refreshing the page at the url, I get the Cannot GET signup error again.
app.js
import React from "react";
import NavigationBar from '../components/navigation-bar';
export class App extends React.Component {
render() {
return (
<div className="container">
<NavigationBar />
{this.props.children}
</div>
);
}
}
index.js
import React from 'react';
import ReactDOM from "react-dom";
import {Provider} from "react-redux";
import {createStore} from "redux";
import allReducers from "./reducers";
import {BrowserRouter as Router, Route, Switch} from "react-router-dom";
import {App} from "./components/app";
import {Greetings} from "./components/greetings";
import {Signup} from "./components/signup";
const store = createStore(allReducers);
ReactDOM.render(
<Provider store={store}>
<Router>
<App>
<Switch>
<Route exact path="/" component={Greetings} />
<Route path="/signup" component={Signup} />
</Switch>
</App>
</Router>
</Provider>, window.document.getElementById("app"));
greetings.js
import React from "react";
export class Greetings extends React.Component {
render() {
return (
<h2>
Greetings
</h2>
);
}
}
signup.js
import React from "react";
export class Signup extends React.Component {
render() {
return (
<h2>
SIGN UP
</h2>
);
}
}
Try using HashRouter over BrowserRouter because to use BrowserRouter web server must be ready to handle real URLs.
import {HashRouter as Router, Route, Switch} from "react-router-dom";