if someone could help that'd be great. I am following a react tutorial except at some point chrome went blank. When I inspect the page, nothing is in the body html tags. The code compiles and builds successfully though. I'm thinking it's a stupid typo or something, but I am no pro. Please let me know if you find my error!
Terminal On Build
you created the router but no routes. in app.js
import React from "react"
import {
BrowserRouter as Router,
Switch,
Route
} from "react-router-dom"
import Home from './pages'
function App () {
return (
<Router>
<Switch>
<Route exact path="/">
<Home />
</Route>
</Switch>
</Router>
);
}
export default App;
Hi all it was a problem in one of my components. The lack of error messages made me think it had something to do with the construction of the app.
Related
I am new to learning React and so far as I have been exploring its amazing. I have a quick question which is how can I display multiple modules such as "app.js" and "About.js" on one page? is this possible?
Here is some images that may help.
React App.js and About.js
React index.js
React js console error
Commonly in a react app, you will route based on different URLs.
The different 'modules' (also known as components) are typically defined in other JS files. See the HomePage and AboutPage files in the example below.
First, import the other pages.
Second, route to them given a path.
A common routing solution in React is React Router
import React from 'react';
import { BrowserRouter } from 'react-router-dom';
import HomePage from './pages/HomePage.js';
import AboutPage from './pages/AboutPage.js';
const MyApp = () => (
<BrowserRouter>
<Switch>
<Route path="/home" component={HomePage} />
<Route path="/about" component={AboutPage} />
</Switch>
</BrowserRouter>
);
Here is my code for the index.js page:
import React from 'react';
import ReactDOM from 'react-dom';
import {BrowserRouter as Router, Route, Switch} from "react-router-dom"
import './css/bootstrap.min.css';
import './css/style.css';
// Pages
import Library from './pages/Library.js'
import Register from './pages/Register.js'
ReactDOM.render(
<div>
<Router>
<Switch>
<Route exact path="/" component={Library}/>
<Route exact path="/library" component={Library}/>
<Route exact path="/register" component={Register}/>
</Switch>
</Router>
</div>,
document.getElementById('root')
)
When I run npm start I get the application as desired. localhost:3000 and localhost:3000/library render the Library component, while localhost:3000/register renders the Register component.
When I run npm run build I get the build folder but when I enter the index.html page, it is blank.
This problem was introduced after I implemented the router. Previously the result of both npm start and npm run build were the same.
Here is the link to the same issue you are facing on the official create-react-app github issues
It is marked as closed there, you can also read that for more info.
You should serve the build folder for example like
npx serve -s build
It seems like I followed all the necessary in the documentation but it keeps giving a 404 Error: "There isn't a GitHub pages here" when I go into https://juliesong.me.
I got my custom domain through GoDaddy and configured the DNS like so:
Then I changed my package.json file to have
"homepage": "https://www.juliesong.me",
Added a CNAME file in the root directory containing
www.juliesong.me
And lastly went into settings in GitHub pages:
I searched my issue up and a lot of people said it might have to do with the React Router, so I edited to include a basename:
import React from 'react';
import ReactDOM from 'react-dom';
import App from './App';
import { HashRouter as Router } from "react-router-dom";
import * as serviceWorker from './serviceWorker';
const routing = (
<Router basename={process.env.PUBLIC_URL}>
<App />
</Router>
);
ReactDOM.render(routing, document.getElementById('root'));
This is my App.js:
import React, { Component } from 'react';
import {Route} from 'react-router-dom';
import { withRouter } from 'react-router'
import { GlobalStyles, } from "./util/GlobalStyles";
import Home from './containers/Home'
class App extends Component {
render() {
const home = () => <Home />
return (
<main>
<GlobalStyles />
<React.Fragment>
<Route exact path="/" component={home} />
</React.Fragment>
</main>
);
}
}
export default withRouter(App);
If anyone could help on this issue, that would be great:)
Try this one
add new file named .htaccess in your build folder
example of file
and add this code into your .htaccess file
the code
Unless you share how you are generating the build and pushing it to GitHub Pages, it is very difficult to identify the cause of this issue.
Still let me share a general way you would deploy a react app in GitHub pages.
You don't need to add basename in your router
Good thing is you are using HashRouter instead of BrowserRouter, because GitHub pages doesn't support history api like normal browser, it will look for a specific file in given path
To deploy your app you need to run the following command in same order -
npm run build # this will generate a build folder
gh-pages -d build # this will publish the build folder to GitHub pages
This is very important that you publish the build folder, because
its contains the index.html file, which GitHub will point.
You can read more about deploying react app to GitHub Pages here
React-app out of the box is client-server application, and you should compile it first to html + client side js before deploying.
There are lots of good docs: create-react-app.dev, medium.com and the shortest way here
If we wanted to change route programatically inside redux, we used to use react-router-redux npm package. However it was archived by its author. Now the recommended solution is connected-react-router:
https://www.npmjs.com/package/connected-react-router
But as the docs say in this package, it should be used INSTEAD of react-router to make it work.
Normally I was using react-router-dom:
import { BrowserRouter } from 'react-router-dom';
<BrowserRouter>
<Route path='/' />
<Route path='/hey' />
</BrowserRouter>
But as the docs say, I have to replace react-router v4/v5 with ConnectedRouter from package:
import { ConnectedRouter } from 'connected-react-router';
<ConnectedRouter history={history}>
<Route path={'/'} />
<Route path={'/foo'} />
</ConnectedRouter>
But this situation causes problem with Link from react-router-dom. Link has to be placed inside BrowserRouter, but I CANT USE IT because there's no BrowserRouter because AS THE DOCS ARE SAYIN - "Remember to delete any usage of BrowserRouter or NativeRouter as leaving this in will cause problems synchronising the state."
Problem is that ConnectedRouter is a connected version of react-router, not react-router-dom, so theres nothing like Link or NavLink in it.
There must be some way, if not I believe this package wouldnt have 3k stars on github...
Question: How to use Link inside ConnectedRouter? Thanks!
I recommend you to stick to to react-router-dom only.
There is no need for connecting it to redux anymore. In the past there could be a reason because it was hard to read the current pathname or search param, since only main page components were receiveing these as location. But right now you can read from anywhere thanks to withRouter.
Also you can use history to push routes. This was also a headache in the past.
When I enter localhost:8080 in my browser it displays App.js component. But when I navigate to localhost:8080/#/hello it displays same App.js component instead of hello.js. localhost:8080/hello show "can not get localhost:8080/hello" . What is the problem with my code? I am using webpack and babel in my App.
//index.js
import React from 'react';
import ReactDOM, { render } from 'react-dom';
import { Provider } from 'react-redux';
import {store} from './public/store/store';
import App from './public/Components/App';
import Hello from './public/Components/hello';
import {
BrowserRouter as Router,
Route
} from 'react-router-dom';
//import './index.css'
render(
<Provider store={store}>
<Router>
<div>
<Route path="/" component={App}/>
<Route path="/hello" component={Hello}/>
</div>
</Router>
</Provider>,
document.getElementById('root')
)
//App.js
import React from 'react';
export default class App extends React.Component {
render() {
return (
<div>
<h1>React Js.</h1>
</div>
);
}
}
//hello.js
import React from 'react';
export default class Hello extends React.Component {
render() {
return (
<div>
<h1>Hello</h1>
</div>
);
}
}
There are a few things happening here, let me try to explain what's going wrong and how you can fix them.
http://localhost:8080/#/hello it displays the same App.js component instead of hello.js.
Because you are using BrowserRouter instead of HashRouter (an older version, # is not working). The browser reads only the first part of your URL which is http://localhost:8080/. The # is similar when you route to a section of a page using the following.
Goto projects
The above keeps the user on the same page but scrolls to the section <div id="projects"></div>
Don't use this, if your are using React Router V4 it's not what you are looking for.
http://localhost:8080/hello displays cannot get http://localhost:8080/hello
You probably don't have a dev server running that supports front-end routing. If you don't, basically what is happening is that by pressing enter you tell the SERVER to serve you page, http://localhost:8080/hello. You don't want this, the server should be passive here and not serve you any other page then your main index.html. So, instead, you want the server to give you http://localhost:8080 and by doing so, it loads your main index.html and scripts, then react takes over, react-router checks the url and it then renders you the /hello route with the Hello component.
In order to achieve this make sure you have webpack-dev-server installed. You can do this by typing the following in the command line.
npm install webpack-dev-server --save-dev
Then add the following to your package.json
devServer: {
publicPath: '/',
historyApiFallback: true
}
// add the below line to the scripts section
"start:dev": "webpack-dev-server"
This basically tells the dev-server to re-route all requests to index.html, so react-router takes care of the routing. Here's more on Webpack-dev-server.
Then in your terminal run npm run start:dev to start the development server.
I hope this all makes sense and with these guidelines you're able to make your code work. If not let me know ;)
NOTE: Alex has a good point as well. React Router v4 renders all routes that match. So, if the path is http://localhost:8080/hello
/ and /hallo both match and will render. If you only want to render one, use exact as Alex mentions, or wrap your routes in a <Switch> component.
<Switch>
<Route path="/" component={App}/>
<Route path="/hello" component={Hello}/>
</Switch>
Here's what the react-router docs say.
Renders the first child or that matches the location
UPDATE:
After the OP uploaded a repo with the problem, the following was corrected to make the routes work. If anyone is interested, the fixed project is on GitHub.
Main points to make the project work:
Use react-router-dom instead of react-router
Tell Express route all incoming traffic to index.html app.get("/*", (req, res) => res.sendFile(__dirname + '/public/index.html'));
Use <Switch> and <Route> components to setup the routes as described in the question. See code here.
Try to use exact directive:
<Route exact path="/" component={App} />
See API doc: https://reacttraining.com/react-router/web/api/Route/exact-bool