Develop Reference

React Router Components not being rendered

I know this question has been asked tons of times but I can't seem to find a working solution for a very simple problem.
I am setting up a simple Navigation Bar using React Bootstrap and React Router
The page loads on the Home page but when a link is clicked the URL changes but the component does not render. When I inspect using google Chrome, the heading is unchanged.
Any help would be greatly appreciated. I've tried almost everything I found here, used withRouter, used regular and elements instead of the ones from React Bootstrap.
Here is the code, index.js is the regular create-react-app set up
App.js
import React from 'react';
import { Home } from './components/pages/Home';
import Navibar from './components/Navibar';
import { LostPets } from './components/pages/LostPets';
import { AdoptPets } from './components/pages/AdoptPets';
import { ContactUs } from './components/pages/ContactUs';
import './App.css';
import { BrowserRouter as Router, Route, Switch } from 'react-router-dom';
function App() {
return (
<div className="App">
{/* Navigation Bar */}
<Router>
<Navibar />
{/* Routes for Pages */}
<Switch>
<Route exact path='/LostPets' component={LostPets}/>
<Route exact path='/AdoptPets' component={AdoptPets}/>
<Route exact path='/ContactUs' component={ContactUs}/>
<Route exact path='/' component={Home}/>
</Switch>
</Router>
</div>
);
}
export default App;
Navbar.js
import React from 'react';
import { Navbar, Nav, Container } from 'react-bootstrap';
function Navibar () {
return(
<Container>
<Navbar bg="primary" variant="dark" sticky="top">
<Navbar.Brand href="#home">PETSTT </Navbar.Brand>
{/* Navigation Bar items */}
<Nav className="mr-auto">
<Nav.Link href="#home">Home </Nav.Link>
<Nav.Link href="#lostpets">Lost Pets </Nav.Link>
<Nav.Link href="#adoptpets">Adopt Me </Nav.Link>
<Nav.Link href="#contactus">Contact Us </Nav.Link>
</Nav>
</Navbar>
</Container>
);
}
All pages are just header text like this.
import React from 'react';
export const Home = () => {
return (
<div>
<h1> Home </h1>
</div>
);
}

You Link is going to the wrong url. You are going to a hash url which would suggest a different section on the same page with that ID.
<Nav.Link href="#lostpets">Lost Pets </Nav.Link>
This doesn't match the routes that you are trying to render. The routes are done correctly.
<Route exact path='/LostPets' component={LostPets}/>
You should change the Link to this:
<Nav.Link href="/LostPets">Lost Pets </Nav.Link>

Building navbar and I get this error Element type is invalid: expected a string (for built-in components) or a class/function for composite components

I'm building a navbar for a project and the above message is telling me to check the render method in my header component. I've tried everything I can think of, including looking through answers on here. Specifically, I tried moving the Header component between my App component and the index.js file Not sure if I need a break or something but in any case, here's my header:
import React from "react";
import Nav from "react-bootstrap/Nav";
import Navbar from "react-bootstrap/Navbar";
import "bootstrap/dist/css/bootstrap.min.css";
import LinkContainer from "react-router-bootstrap";
const header = () => {
return (
<Navbar collapseOnSelect expand="lg">
<LinkContainer to="/App">
<Navbar.Brand href="/App">
<img
src="/PPLogoEdit.jpg"
width="110"
height="50"
className="d-inline-block align-top"
alt="pikelogo"
/>
</Navbar.Brand>
</LinkContainer>
<Navbar.Toggle aria-controls="responsive-navbar-nav" />
<Navbar.Collapse id="responsive-navbar-nav">
<Nav className="mr-auto">
<LinkContainer to="/App">
<Nav.Link style={{ color: "yellow" }} href="/App">
Home
</Nav.Link>
</LinkContainer>
<LinkContainer to="/About">
<Nav.Link style={{ color: "orange" }} href="/About">
About
</Nav.Link>
</LinkContainer>
<LinkContainer to="/Gallery">
<Nav.Link style={{ color: "green" }} href="/Gallery">
Gallery
</Nav.Link>
</LinkContainer>
<LinkContainer to="/Shop">
<Nav.Link style={{ color: "blue" }} href="/Shop">
Shop
</Nav.Link>
</LinkContainer>
<LinkContainer to="Contact">
<Nav.Link style={{ color: "purple" }} href="/Contact">
Contact
</Nav.Link>
</LinkContainer>
</Nav>
</Navbar.Collapse>
</Navbar>
);
}
export default header
and the index.js file:
import React from "react";
import ReactDOM from "react-dom";
import 'bootstrap/dist/css/bootstrap.min.css'
import { BrowserRouter as Router, Switch, Route } from "react-router-dom";
import Header from './components/Header';
import App from "./components/App";
import About from "./components/About";
import Gallery from "./components/Gallery";
import Shop from "./components/Shop";
import Contact from "./components/Contact";
ReactDOM.render(<React.StrictMode>
<Router>
<Switch>
<Route exact path="/" component={App} />
<Route path="/about" component={About} />
<Route path="/gallery" component={Gallery} />
<Route path="/shop" component={Shop} />
<Route path="/contact" component={Contact} />
</Switch>
</Router>
</React.StrictMode>, document.getElementById("root"));
Any help is appreciated, thank you!

Look at the error messages:
Warning: React.createElement: 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, or you might have mixed up
default and named imports.
Check your code at Header.jsx:24.
in Header (at src/index.js:15)
in Router (created by BrowserRouter)
in BrowserRouter (at src/index.js:14)
in StrictMode (at src/index.js:13)
Repeats "Check your code at Header.jsx:XX" for all lines where LinkContainer is used.
It's flagging the LinkContainer you try to import from react-router-bootstrap. You default import it but it should be a named import.
import { LinkContainer } from "react-router-bootstrap";

Having Trouble rendering React Resume & Portfolio components - Header, Footer, & Profile components are all rendering fine

I'm having issues rendering my Portfolio & Resume components.
I think the issue may be react-router related.
Here is my appjs file:
import React from 'react';
import Profile from './components/Profile/Profile'
import Header from './components/Header/Header'
import Footer from './components/Footer/Footer'
import Portfolio from './pages/Portfolio/Portfolio'
import Resume from './pages/Resume/Resume'
import {
Button,
Form,
FormControl,
Nav,
NavLink,
NavDropdown,
} from 'react-bootstrap';
import { BrowserRouter as Router, Switch, Route, } from 'react-router-dom'
import './App.css';
function App() {
return (
<Container className={'top_60'}>
{/* *Container adds space on both edges or sides of the page* */}
{/* Profile.js line 36 */}
<Grid container spacing={7}>
<Grid item xs={12}
sm={12}
md={4}
lg={3}>
<Profile/>
</Grid>
<Grid item xs>
<Router>
<Header />
<Switch>
<Nav.Link as={NavLink} to="/" />
<Route path="/portfolio">
<Portfolio />
</Route>
<Route path="/">
<Resume />
</Route>
</Switch>
</Router>
<Footer />
</Grid>
</Grid>
</Container>
);
}
export default App;
Resume & Portfolio component code as of right now:
1.Resumejs
import React from 'react'
const Resume = () => {
return (
<div>
Resume Page
</div>
)
}
export default Resume
2.Portfoliojs
import React from 'react'
const Portfolio = () => {
return (
<div>
Portfolio Page
</div>
)
}
export default Portfolio
I'm not getting any errors but the Portfolio & Resume components are both not rendering on the page.
Any suggestions would be appreciated.

<Switch> renders the first child that matches the location, in your case <Nav.Link as={NavLink} to="/" /> is being rendered.

Placing the Nav AFTER the Routes, within the Switch,
<Route path="/portfolio">
<Portfolio />
</Route>
<Route path="/">
<Resume />
</Route>
<Nav.Link as={NavLink} to="/" />
within the appjs file , seems to solve this issue.

react-bootstrap Navbar not rendering properly in React js

I am using bootstrap 4 with reactjs. Using react-bootstrap module, trying to render the Navbar , but somehow , it is not rendering properly.
i am using bootstrap 4 syntax in the code but not sure whether any module/lib is using any bootstrap syntax 3
here is the code (App.js) :
import React, { Component } from 'react';
import Header from './Components/HeaderComponents/header';
import Footer from './Components/FooterComponents/footer';
import Homepage from './Components/pages/homePage';
import { BrowserRouter as Router, Route } from 'react-router-dom';
import CustNavbar from './Components/pages/navbar';
import About from './Components/pages/About';
import News from './Components/pages/News';
import ReactBootstrap, { Navbar, Nav, NavItem, Jumbotron, Container, Row, Column, Image, Button } from 'react-bootstrap';
import './Assets/css/default.min.css';
class App extends Component {
render() {
return (
<Router>
<div className="App">
<Navbar />
<Route exact path="/" component={Homepage} />
<Route path="/about" component={About} />
<Route path="/news" component={News} />
</div>
</Router>
);
}
}
export default App;
and the navbar.js :
import React, { Component } from 'react';
import ReactBootstrap, { Navbar, Nav, NavItem } from 'react-bootstrap';
import { Link } from 'react-router-dom';
class CustNavbar extends Component {
render() {
return (
<Navbar default collapseOnSelect>
<Navbar.Header>
<Navbar.Brand>
<Link to="/">CodeLife</Link>
</Navbar.Brand>
<Navbar.Toggle />
</Navbar.Header>
<Navbar.Collapse>
<Nav pullRight>
<NavItem eventKey={1} componentClass={Link} to="/">
Home
</NavItem>
<NavItem eventKey={2} componentClass={Link} to="/about">
About
</NavItem>
<NavItem eventKey={3} componentClass={Link} to="/news">
News
</NavItem>
</Nav>
</Navbar.Collapse>
</Navbar>
)
}
}
export default CustNavbar;
what is happening
now the issue, there is no any compilation error , but somehow , Navigation bar is not rendering properly. Not sure whether the issue with version syntax or the implementation itself. please suggest
what is expected
Navigation bar should appear in the homepage before Grid/container
EDIT 1:
I have modified the code as suggested . please below :
App.js
import React, { Fragment, Component } from 'react';
import Header from './Components/HeaderComponents/header';
import Footer from './Components/FooterComponents/footer';
import Homepage from './Components/pages/homePage';
import CorporateTraining from './Components/pages/corporateTraining';
import { BrowserRouter as Router, Route } from 'react-router-dom';
import CustNavbar from './Components/pages/navbar';
import About from './Components/pages/About';
import News from './Components/pages/News';
import ReactBootstrap, { Navbar, Nav, NavItem, Jumbotron, Container, Row, Column, Image, Button } from 'react-bootstrap';
import './Assets/css/default.min.css';
class App extends Component {
render() {
return (
<Fragment>
<Navbar />
<div className="App">
<Router>
<Route exact path="/" component={Homepage} />
<Route path="/about" component={About} />
<Route path="/news" component={News} />
</Router>
</div>
</Fragment>
);
}
}
export default App;
Regards,

I'm not really sure as its too unclear. But try moving your navbar on top of router as i assume that className App have styling in them. Let me know
import React, { Fragment, Component } from 'react';
...
return (
<Fragment>
<Navbar />
<div className="App">
<Router>
<Switch>
<Route exact path="/" component={Homepage} />
<Route path="/about" component={About} />
<Route path="/news" component={News} />
</Switch
</Router>
</div>
</Fragment>
)
Don't forget to add Fragment

Navigation Links do not work outside of the App Component

I have 4 files: App.js, navbar.js, signIn.js, signUp.js. I expect the navbar to be displayed at the top of each page that the user navigates. The links in the navbar work on the homepage but the links are disabled on any other page.
I've tried installing react-bootstrap through npm instead of using the cdn but that did not change the issue. I tried creating another group of components called "NavigationLinks.js" but that didn't work either. I'm at a loss as to what else I could do.
Here are the relevant files:
App.js
import logo from './logo.svg';
import './App.css';
import Navbar from './components/layout/navbar'
import Dashboard from './components/feed/dashboard'
import SignIn from './components/auth/signIn'
import SignUp from './components/auth/signUp'
import { BrowserRouter, Switch, Route } from 'react-router-dom';
function App() {
return (
<BrowserRouter>
<div className="App">
<Navbar/>
<Switch>
<Route exact path="/" component={Dashboard}/>
<Route path="/signin" component={SignIn}/>
<Route path="/signup" component={SignUp}/>
</Switch>
</div>
</BrowserRouter>
);
}
export default App;
Navbar.js
import { Switch, Route, Link} from 'react-router-dom';
import { Navbar, Nav, Form, FormControl, Button, NavItem } from 'react-bootstrap';
//import './navbar.css';
class navbar extends Component {
render() {
return (
<div>
<div>
<Navbar>
<Navbar.Brand as={Link} to='/'>Rekindle</Navbar.Brand>
<Navbar.Collapse>
<Nav className="mr-auto">
<NavItem eventkey={1} href="/">
<Nav.Link as={Link} to="/" >Home</Nav.Link>
</NavItem>
<NavItem eventkey={1} href="/signup">
<Nav.Link as={Link} to="/signup" >Sign Up</Nav.Link>
</NavItem>
<NavItem eventkey={1} href="/signin">
<Nav.Link as={Link} to="/signin" >Login</Nav.Link>
</NavItem>
</Nav>
</Navbar.Collapse>
</Navbar>
</div>
{/*this div works for the routing */}
<div>
</div>
</div>
);
}
}
export default navbar;
The code compiles without errors, but I want to be able to navigate back to the homepage from the signIn and signUp routes.

In your code snippet I found some issue, like you missed to import react only.
Any file you create, you need to import react like,
import React from 'react'; //default
Also you are extending Component in your navbar component which is also need to import from react package.
2 ways to extend Component.
Way 1,
import React from 'react';
class navbar extends React.Component{
render(){
return(
<div>...</div>
)
}
}
export default navbar;
Way 2,
import React,{Component} from 'react';
class navbar extends Component{
render(){
return(
<div>...</div>
)
}
}
export default navbar;
You missed this in you navbar component.
Here is the working code snippet for you.

It looks like these integration errors are common and you are suppose to use: https://github.com/react-bootstrap/react-router-bootstrap