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React-router v4, URL changing but component doesn't render

I've tried everything but fail to render component when URL changes. No error messages nothing, react-redux is installed but not using it yet, so it can't be the problem. When I check it from to Google chrome React dev tools, nothing happens, there is no match, history vs anything. I couldn't find a solution, is there any way to make it work?
https://codesandbox.io/s/vm3x9n4k67
Here is my NavBar.js. I import NavLink from react-router-dom and implement these
import React from 'react'
import classes from "./NavBar.css";
import { NavLink } from 'react-router-dom';
const NavBar = (props) => {
return (
<div className={classes.NavBar}>
<h1 className={classes.NavBar_list} >foodbase</h1>
<ul className={classes.NavBar_list}>
<NavLink to="/auth"> <li className={classes.NavBar_list_item}>Signin</li></NavLink>
<NavLink to="/"><li className={classes.NavBar_list_item}>Main Page</li></NavLink>
</ul>
</div>
)
}
export default NavBar
this is my Layout.js render property:
render() {
let recipes = [];
if (this.state.recipes.length > 0) {
recipes = this.state.recipes;
}
return (
<div>
<NavBar/>
<SearchBox
onChangeHandler={this.onChangeHandler}
value={this.state.inputValue}
onSearchClick={this.onClickedHandler} />
<section className={classes.SearchSection}>
<ul className={classes.SearchResultArea}>
<SearchResults
Results={recipes}
></SearchResults>
</ul>
</section>
</div>
)
}
and finally app.js:
import React, { Component } from 'react';
import { Switch, Route, BrowserRouter, withRouter } from 'react-router-dom';
import Auth from './components/Auth/Auth';
import SearchBox from './components/SearchBox/SearchBox';
import Layout from './containers/Layout/Layout';
import './App.css';
class App extends Component {
render() {
return (
<div>
<BrowserRouter>
<Switch>
<Layout>
<Route path="/auth" component={Auth} />
<Route path="/" exact component={SearchBox} />
</Layout>
</Switch>
</BrowserRouter>
</div>
);
}
}
export default withRouter(App);

I assume that you need to put your Route components directly into Switch and don't forget to render children in Layout. So try this:
app.js:
class App extends Component {
render() {
return (
<div>
<BrowserRouter>
<Layout>
<Switch>
<Route path="/auth" component={Auth} />
<Route path="/" exact component={SearchBox} />
</Switch>
</Layout>
</BrowserRouter>
</div>
);
}
}
Layout.js
render() {
// ...
return (
<div>
<NavBar />
{ this.props.children } // <-- your route specific components
</div>
)
}

How properly setup react-router-dom in Home Route?

I have this index.js:
<Provider store={store}>
<Router history={history}>
<App/>
</Router>
</Provider>
this App.js:
<Switch>
<Route exact path="/" component={Home} />
<Route
path="/login"
render={() => <Login userError={this.state.userError} />}
/>
<Route path="/registration" component={Registration} />;
</Switch>
and Home.js:
<div className="Home">
<Header/>
<div className="content">
<Sidenav/>
<Switch>
<Route path="/friends" component={Friends}/>
</Switch>
<Feed/>
</div>
</div>
I want Friends component to be rendered inside content block, but now if I try to reach /friends route via Link I am getting blank page. If I set /friends Route in App.js, it will be OK, but I won't have it in my content class, because it will be another page.
May you give me a hand with that?
Also in feature I will be have more items to display in content, that's why I put Switch in Home.js
Thanks in advance!

Move your content class and <Friends>
The issue you're having is that the component Home is not rendering when you visit /friends because it will only render when you go to /
To fix this just move the Route into the App.js file, along with the content class into the Friends component.
To make this easier, you could make your content class into a component. This way you could wrap it around all of the stuff you render.
Or move <Friends> and wrap content
What I mean by this is that you could also create your own Route component that wraps whatever component passed to it in a Content component. It might look similar to this:
const ContentRoute = ({ component, ...props }) => (
<Route {...props} component={() => (
<Content>
<component />
</Content>
)}>
</Route>
)

You can access demo here
Here what I have done. This demonstrates how to set layout when page's changing.
- src/
-- components/
--- Header.js
--- Sidenav.js
-- pages/
--- Home.js
--- Login.js
--- withBase.js
-- App.js
-- BaseLayout.js
-- routes.js
At first, let's make dummy components.
components/Header
import React from 'react';
export default () => (
<div>
This is Header.
</div>
);
components/Sidenav
import React from 'react';
export default () => (
<div>
This is Sidenav.
</div>
);
Then, pages.
pages/Home
import React from 'react';
import { NavLink } from 'react-router-dom';
import withBase from './withBase';
const Home = () => (
<div>
<p>Welcome Home!!!</p>
<NavLink to="/login">Go to login page</NavLink>
</div>
);
export default withBase(Home);
pages/Login
import React from 'react';
import { NavLink } from 'react-router-dom';
import withBase from './withBase';
const Login = () => (
<div>
<p>You have to login here...</p>
<NavLink to="/">Go home</NavLink>
</div>
);
export default withBase(Login);
pages/withBase
import React from 'react';
export default WrappedComponent => (
class extends React.Component {
componentDidMount() {
this.props.showHeaderSidenav();
}
render() {
return <WrappedComponent />;
}
}
);
As you see, withBase is a HOC. It runs showHeaderSidenav when the page is mounted.
App
import React from 'react';
import { Switch, Route } from 'react-router-dom';
import BaseLayout from './BaseLayout';
import routes from './routes';
export default class extends React.Component {
state = {
withHeaderSidenav: true
}
showHeaderSidenav = (withHeaderSidenav = true) => {
this.setState({ withHeaderSidenav });
}
render() {
return (
<BaseLayout withHeaderSidenav={this.state.withHeaderSidenav}>
<Switch>
{routes.map(route => (
<Route
exact
key={route.path}
path={route.path}
render={() => (
<route.component
showHeaderSidenav={() => this.showHeaderSidenav(route.withHeaderSidenav)}
/>
)}
/>
))}
</Switch>
</BaseLayout>
);
}
}
BaseLayout
import React from 'react';
import Header from './components/Header';
import Sidenav from './components/Sidenav';
export default ({ withHeaderSidenav, children }) => (
<div>
{withHeaderSidenav && <Header />}
<div className="content">
{withHeaderSidenav && <Sidenav />}
{children}
</div>
</div>
);
We can say that BaseLayout is like a wrapper. It contains dynamic components which will be shown based on withHeaderSidenav prop.
Finally...
routes
import Home from './pages/Home';
import Login from './pages/Login';
export default [
{
path: '/',
component: Home,
withHeaderSidenav: true
},
{
path: '/login',
component: Login,
withHeaderSidenav: false
},
];

You could have moved(declared) content component inside Friends component. I do not see the reason why content component should live outside of Friends component. You can declare content component inside any component that needs it.Content component does not have to mess with routing implementation

react-router v4: How to create a contentFor like feature?

I have this:
import { Route } from 'react-router-dom'
const App = () => (
<div>
{header} // or the header block
<Route exact path="/" component={Home} />
<Route path="/about" component={About} />
</div>
)
Then my About component looks like this:
const About = () => {
// contentFor header
const myCustomHeader = <div>About header</div>
return (
<div>
About page
</div>
)
}
Is there a way to replace the header in the App component with the myCustomHeader component from the About component ?

You can pass a function prop to update the parents state. You'll have to use render instead of component on your Route to pass props.
import { Route } from 'react-router-dom'
import React from 'react'
class App extends React.Component{
state = {
header:"One Header"
}
render(){
return (
<div>
{this.state.header} // or the header block
<Route exact path="/" component={Home} />
<Route path="/about" render={()=><About updateHeader={(newHeader)=>this.setState({header:newHeader})} />}/>
</div>
)
}
}
And your About :
import React from 'react'
class About extends React.Component{
render(){
this.props.updateHeader(<div>About header</div>);
return (
<div>
About page
</div>
)
}
}

react router slug compared to part of array

I started to experiment with react router, and dynamic matches.
I wanted to create a function which matches the slug of the URL to a slug in a JSON file.
The error I get:
TypeError: Unable to get property 'slug' of undefined or null reference
I think that the 'Slug' of the url is undefined, but I am not sure on how to fix it.
screenshot of error
my code for routes.js:
import React from 'react';
import Header from './components/header/header.js';
import Home from './components/home/home.js';
import About from './components/about/about.js';
import NotFound from './components/notFound/notFound.js'
import { BrowserRouter as Router, Route, Switch } from "react-router-dom";
import PostPage from './components/postpage/postpage.js'
import posts from './files/data.json';
class Routes extends React.Component {
render(){
return (
<Router>
<div>
<Header />
<Switch>
<Route exact path="/" component={Home} />
<Route path="/about" component={About}/>
<Route path="/home" component={Home}/>
<Route path="/:slug" component={props => {
const postt = posts.posts.filter (post => props.params.slug === post.slug)
console.log(postt.length)
return <PostPage post={postt} />
} } />
}}/>
<Route component={NotFound} />
</Switch>
</div>
</Router>
);
}
}
export default Routes;
PostsPage.js:
import React from 'react';
import Post from '../post/post.js'
const PostPage = (props) => (
<div>
<Post {...props.post}/>
</div>
);
export default PostPage;
and posts.js:
import React from 'react';
import { Link } from 'react-router-dom';
import './post.css';
class Post extends React.Component {
render(){
return(
<div>
<div >
<h2 className='subTitle'><Link to={`/post/${this.props.slug}`} className='link'>{this.props.title}</Link></h2>
<p className='content'>{this.props.excerpt}</p>
</div>
</div>
);
}
}
export default Post;
If you made it this far thank you for helping

slug variable is given inside match props which you are missing.
<Route path="/:slug" render={props => {
const postt = posts.posts.filter (post => props.match.params.slug === post.slug)
console.log(postt.length)
return <PostPage post={postt} />
} } />
}}/>
Also, do not inline component use a render function instead. From the docs:
When you use component (instead of render or children, below) the
router uses React.createElement to create a new React element from the
given component. That means if you provide an inline function to the
component prop, you would create a new component every render. This
results in the existing component unmounting and the new component
mounting instead of just updating the existing component. When using
an inline function for inline rendering, use the render or the
children prop (below).
https://reacttraining.com/react-router/web/api/Route/render-func

One of the ways you can get this fixed is by using .find() instead of .filter() like this :
const postt = posts.find (post => props.match.params.slug === post.slug)
And then inside your <Router /> make sure to send the rest of {...props} as well :
<Route path="/:slug" component={props => {
const postt = posts.find (post => props.match.params.slug === post.slug)
console.log(postt.length)
return <PostPage post={postt} {...props} />
} } />

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>);
}
});