Nothing displays when using React Router - javascript

I followed this tutorialpoint and it works well when all the code in main.js. But if i put my code in separated files, it doesn't work:
app.jsx
import React from 'react';
import Link from 'react-router';
export default class App extends React.Component {
render() {
return (
<div>
<ul>
<li><Link to="/Home">Home</Link></li>
<li><Link to="/About">About</Link></li>
<li><Link to="/Contact">Contact</Link></li>
</ul>
{this.props.children}
</div>
)
}
}
export class Home extends React.Component {
render() {
return (
<div>
<h1>Home...</h1>
</div>
)
}
}
export class About extends React.Component {
render() {
return (
<div>
<h1>About...</h1>
</div>
)
}
}
export class Contact extends React.Component {
render() {
return (
<div>
<h1>Contact...</h1>
</div>
)
}
}
main.js
import React from 'react';
import ReactDOM from 'react-dom';
import { Router, Route, Link, browserHistory, IndexRoute } from 'react-router';
import App, { Home, About, Contact } from './app.jsx';
ReactDOM.render((
<Router history = {browserHistory}>
<Route path = "/" component = {App}>
<IndexRoute component = {Home} />
<Route path = "home" component = {Home} />
<Route path = "about" component = {About} />
<Route path = "contact" component = {Contact} />
</Route>
</Router>
), document.getElementById('app'));
Maybe export not works ? In my console, i have some warnings:
index.js:9169 Warning: React.createElement: type should not be null,
undefined, boolean, or number. It should be a string (for DOM
elements) or a ReactClass (for composite components). Check the render
method of App.

The way you are importing Link is not correct.
import Link from 'react-router';
should be
import { Link } from 'react-router'

Related

React router dom don't render pages

my page don't render the HomePage
but if i only use
h1 Test HomePage h1
in render it work.
i wanna know where i should fix it or what im doing wrong
thanks for help
or you need to see the other file you can tell me
im kinda new to the programming
import React, { Component } from "react";
import { render } from "react-dom";
import HomePage from "./HomePage";
import RoomJoinPage from "./RoomJoinPage";
import CreateRoomPage from "./CreateRoomPage";
export default class App extends Component {
constructor(props) {
super(props);
}
render() {
return (
<div>
<HomePage/>
</div>
);
}
}
const appDiv = document.getElementById("app");
render(<App />, appDiv);
this is my HomePage Code
import React, { Component } from "react";
import RoomJoinPage from "./RoomJoinPage";
import CreateRoomPage from "./CreateRoomPage";
import {
BrowserRouter as Router,
Switch,
Route,
Link,
Redirect,
} from "react-router-dom";
export default class HomePage extends Component {
constructor(props) {
super(props);
}
render() {
return (
<Router>
<Switch>
<Route exact path="/">
<p>This is the home page</p>
</Route>
<Route path="/join" component={RoomJoinPage} />
<Route path="/create" component={CreateRoomPage} />
</Switch>
</Router>
);
}
}

Page contains from many component turn blank when reload page?

I'm a newbie in React js and currently i'm building a layout that contains from many components
For example, a home page layout that contains sidebar component, topbar component, footer component and main content component.
When i click on a link in sidebar component, the main content will be changed based on url of link i clicked on and other components will be same on all pages regardless of url.
Here is my code:
MainLayout.js
import React, { Component } from 'react';
import { Route } from 'react-router-dom';
import Sidebar from '../components/Sidebar';
const MainLayout = ({children, ...rest}) => {
return (
<div className="page page-dashboard">
{/* <div className="sidebar"><Sidebar></Sidebar></div> */}
<div className="main">
{children}
</div>
</div>
)
}
const MainLayoutRoute = ({component: Component, ...rest}) => {
return (
<Route {...rest} render={matchProps => (
<MainLayout>
<Component {...matchProps} />
</MainLayout>
)} />
)
};
export default MainLayoutRoute;
MainPage.js
import React, { Component } from 'react';
import { BrowserRouter as Router, Route, Redirect, Switch } from 'react-router-dom';
import Sidebar from './Sidebar';
import Header from './Header';
import Footer from './Footer';
import UsersList from './UsersList';
export default class MainPage extends Component {
render() {
return (
<Router>
<div>
<Header/>
<Sidebar/>
<div className="wrapper">
<Switch>
<Route path={"/users"} component={UsersList} />
</Switch>
</div>
<Footer></Footer>
</div>
</Router>
);
}
}
Sidebar.js
import React, { Component } from 'react';
import { BrowserRouter as Router, Route, Redirect, Switch, Link } from 'react-router-dom';
export default class Sidebar extends Component {
render() {
return (
<div className="sidenav">
<ul>
<li><Link to="/users">Users</Link></li>
<li><Link to="/settings">Setting</Link></li>
</ul>
</div>
);
}
}
UserList.js
import React, { Component } from 'react';
import { BrowserRouter as Router, Route, Redirect, Switch, Link } from 'react-router-dom';
export default class UsersList extends Component {
render() {
return (
<div>
<button><Link to="/newuser">Add new user</Link></button>
</div>
);
}
}
App.js
import React, { Component } from 'react';
import { BrowserRouter as Router, Route, Redirect, Switch } from 'react-router-dom';
import logo from './logo.svg';
import './App.css';
import './css/custom.scss';
/** Layouts **/
import LoginLayoutRoute from "./layouts/LoginLayout";
import MainLayoutRoute from "./layouts/MainLayout";
/** Components **/
import MainPage from './components/MainPage';
import LoginPage from './components/LoginPage'
export default class App extends Component {
render() {
return (
<Router>
<Switch>
<Route exact path="/">
<Redirect to="/login" />
</Route>
<LoginLayoutRoute path="/login" component={LoginPage} />
<MainLayoutRoute path="/home" component={MainPage} />
</Switch>
</Router>
);
}
}
But when i refresh the page, it turned blank like this:
Before i refresh page
After i refresh page
How can i fix this ?

Header component keeps rerendering when changing Route on React

When pressing {Link} and changing Route, the header component NavBar keeps rerendering, even when is outside the Switch component from react-router-dom.
here are the files:
Main index.js file:
import React from 'react'
import styles from './styles.css'
import {Route, Switch} from 'react-router-dom'
import Home from './Home'
import Settings from './Settings'
import Layout from './Layout'
import Contact from './Contact'
import NavBar from 'App/components/NavBar'
export default class MainHome extends React.Component {
static propTypes = {}
render() {
return (
<div className={styles.container}>
<NavBar />
<Switch>
<Route path="/settings" component={Settings} />
<Route path="/contact" component={Contact} />
<Route path="/" component={Home} />
</Switch>
</div>
)
}
}
Home.js
import React from 'react'
import styles from './styles.css'
import {Link} from 'react-router-dom'
export default class Home extends React.Component {
static propTypes = {}
render() {
return (
<div className={styles.container}>
<h1>Hello world</h1>
<Link to="/contact">Contact</Link>
</div>
)
}
}
Contact.js
import React from 'react'
import styles from './styles.css'
import {Link} from 'react-router-dom'
export default class Contact extends React.Component {
static propTypes = {}
render() {
return (
<div className={styles.container}>
Contact
<Link to="/">Home</Link>
</div>
)
}
}
The current project is pretty simple: the index.js file has inside the Home and Contact components, and the NavBar component as a header outside the Switch.
#MattyJ I'm using react-router-dom#^4.2.1. The component with the Router looks like this:
import React from 'react'
import Root from 'App/Root'
import Pages from './Pages'
import {BrowserRouter} from 'react-router-dom'
export default class App extends React.Component {
render() {
return (
<BrowserRouter key={Math.random()}>
<Root>
<Pages />
</Root>
</BrowserRouter>
)
}
}
Pages encapsulates two components: App, where is located the Switch component from my question, and Auth for managing autentication:
import React from 'react'
import authRouteRegex from './Auth/routeRegex'
import {withRouter} from 'react-router'
import PropTypes from 'prop-types'
import DynamicComponent from 'App/components/DynamicComponent'
import App from './App'
#withRouter
export default class Pages extends React.Component {
static propTypes = {
location: PropTypes.object
}
render() {
if (authRouteRegex.test(this.props.location.pathname)) {
const Component = DynamicComponent(() => import('./Auth'))
return <Component />
}
return <App />
}
}

React Component not rendering on using react router 4

I am working on a simple demo React project. I have a Home component which gets rendered when directly placed in main.js but when placed inside the Router in Routes.js, it is not rendered. Can anyone let me know what am I doing wrong here?
main.js file
import React from "react";
import {render} from "react-dom";
import {App} from "./app/App";
import Routes from "./app/Routes";
render( <Routes />,
document.getElementById("root")
)
Routes.js file
import React from "react";
import {
BrowserRouter as Router,
Route,
Switch,
} from "react-router-dom";
import {App}
from "./App";
import Home from "./components/Home";
export default function Routes(props) {
console.log('Routes');
return (
<Router>
<App>
<Switch>
<Route path="/" exact component={Home} />
</Switch>
</App>
</Router>
)
}
App.js file
import React from "react";
import Header from "./components/Header";
export class App extends React.Component {
render() {
console.log("App render");
return (
<div>
<h1> Welcome to React </h1>
<Header/>
</div>
)
}
}
Header.js file
import React, {Component} from 'react';
import {NavLink} from 'react-router-dom';
export default class Header extends Component {
render() {
console.log("Header render");
return (
<div>
<NavLink to="/" exact>
Home
</NavLink>
</div>
)
}
}
Home.js file
import React, {Component} from "react";
export default class Home extends Component {
render() {
console.log("Home render");
return (
<div>
<h2>Hello World!</h2>
</div>
)
}
}
This is because you are using App component as the wrapper of whole app, and defined the Switch as the children of App component, so you need to use this.props.children inside App.
Like this:
export class App extends React.Component {
render() {
console.log("App render");
return (
<div>
<h1> Welcome to React </h1>
<Header/>
{this.props.children}
</div>
)
}
}
Consider this example to make the whole picture more clear, if you write:
<App>
<Home />
</App>
Means Home will get passed as children to App component, automatically it will not get rendered inside App, you need to put this.props.children somewhere inside App.
With react-router-v4 which you seem to be using, it is possible to have dynamic Routing which means you can add the Routes within nested components and hence apart from the solution that #MayankShukla suggested you could also keep the <Switch> and other routes within App like
export default function Routes(props) {
console.log('Routes');
return (
<Router>
<App/>
</Router>
)
}
export class App extends React.Component {
render() {
console.log("App render");
return (
<div>
<h1> Welcome to React </h1>
<Header/>
<Switch>
<Route path="/" exact component={Home} />
</Switch>
</div>
)
}
}
You could read more about the advantages of Dynamic Routing here

React.js - React Router content not changing

I'm trying to set up my react.js environment to build a UI Toolkit. I'm using react-router, but for some reason the URL changes when I click on the links rendered from Index.js, but the content stays the same. It just continues displaying the content from the index.js page instead of changing to the content of the link I clicked. I'm not getting any error messages on the console.
main.js
import React from 'react';
import ReactDOM from 'react-dom';
import { Router, browserHistory } from 'react-router';
import routes from './routes';
function run(){
const reactMount = document.getElementById('app');
ReactDOM.render(<Router onUpdate={() => window.scrollTo(0, 0)} history= {browserHistory} routes={routes}/>, reactMount );
}
new Promise((resolve) => {
if (window.addEventListener) {
window.addEventListener('DOMContentLoaded', resolve);
} else {
window.attachEvent('onload', resolve);
}
}).then(run)
routes.js
import React from 'react';
import { IndexRoute, Route } from 'react-router';
import Index from './pages/Index';
import Text from './pages/Text';
import Icon from './pages/Icon';
var routes = (
<Route path="/" component={Index}>
<Route path="/Text" component={Text} />
<Route path="/Icon" component={Icon} />
</Route>
);
export default routes;
pages/Index.js
import React from 'react';
import {Link} from 'react-router';
class Index extends React.Component {
render() {
return (
<div>
<ul role="nav">
<li><Link to="/Text">Text</Link></li>
<li><Link to="/Icon">Icon</Link></li>
</ul>
</div>
)
}
}
export default Index;
pages/Text.js
import React from 'react';
class Text extends React.Component {
render() {
return (
<div>
<h1>Text</h1>
</div>
)
}
}
export default Text;
Two things here:
The nested routes Text and Icon in your route configuration shouldn't have / before them. It should be like this: <Route path="Text" component={Text} />.
In your container component (Index) you need to access this.props.children so that the component knows to render it's children (the nested routes).
// Index.js
return (
<div>
<ul role="nav">
<li><Link to="/Text">Text</Link></li>
<li><Link to="/Icon">Icon</Link></li>
</ul>
{ this.props.children }
</div>
)

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