How can I use react-loadable with react-router?

Question

I am trying to implement an application that has 10-15 pages. That works with react-router well but I should use react-loadable to have a Spinner and loading effect ...

But how can I import router components inside the loadable ?

I should create one const variable for each component ?

Like this :

const Home = Loadable({
    loader: () => import('./Home'),
    loading: Loading,
});

const News = Loadable({
    loader: () => import('./News'),
    loading: Loading,
});

const Gallery = Loadable({
    loader: () => import('./Gallery'),
    loading: Loading,
});

class App extends React.Component {
    render() {
        return (
          <Router>
              <Route exact path="/" component={Home} />
              <Route path="/news" component={News} />
              <Route path="/gallery" component={Gallery} />
          </Router>
        )
    }
}

Or it's possible with other tricks ?

Answer 1

This is a bit tricky. You don't need to use react-loadable.

Demo here.

If you want to make loader for images and other components until they are onLoad, you can use react-content-loader instead to create skeleton screens (See components/Image.js in demo). It could make "almost" perfect loader. So far, this is what I can do. I have no idea to detect onLoad for css :(

You can create a new file named routes.js which includes all pages.

- /src
-- /pages
--- Gallery.js
--- Home.js
--- News.js
--- withBase.js
-- App.js
-- routes.js

routes.js

import Home from './pages/Home';
import Gallery from './pages/Gallery';
import News from './pages/News';
// Add as much as you want...

export default [
   {
       path: '/',
       component: Home,
   },
   {
       path: '/gallery',
       component: Gallery,
   },
   {
       path: '/news',
       component: News,
   },
];

You need to create a high order component that will wrap each page.

withBase.js (HOC)

import React from "react";

export default WrappedComponent =>
  class extends React.Component {
    state = {
      isLoading: true
    };

    componentDidMount() {
      this.hideLoader();
    }

    hideLoader = () => {
      // This is for demo purpose
      const proc = new Promise(resolve => {
        setTimeout(() => resolve(), 3000);
      });
      proc.then(() => this.setState({ isLoading: false }));
    };

    render() {
      return (
        <div>
          {this.state.isLoading ? <p>Loading...</p> : <WrappedComponent />}
        </div>
      );
    }
  };

Usage: e.g. export default withBase(Home).

Then, in App.js just loop the routes.

    <Switch>
      {routes.map(route => (
        <Route
          exact
          key={route.path}
          path={route.path}
          component={route.component}
        />
      ))}
    </Switch>