使用热重载的ReactJS服务器端渲染（webpack-dev-server）

Question

I'm trying to build my first server side rendering with ReactJS. I've based my code from this Redux tutorial

The application is working fine when running npm start ( webpack && node server.js ).

I want to use hot reloading to be able to do an application fast debugging on dev environment. So I've added the start option on my npm configuration ( webpack-dev-server --inline --hot ). Notice that I don't have a index.html file as react-router is choosing the proper JSX file to load.

npm start opens my public folder and show files, but does no start my application. Normally I would click on a index.html file, but I have none.

I can't understand what's going on and don't know how to solve. Help appreciated.

package.json:

  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "build": "webpack --config webpack.config.prod.js -p",
    "start": "webpack-dev-server --inline --hot",
    "dev": "webpack && node server.js"
  },

webpack.config.js:

module.exports = {
    entry: './client.js',
    output: {
        filename: 'bundle.js',
        path: __dirname + '/public'
    },
    module: {
        loaders: [
            {
                test: /\.jsx?$/,
                exclude: /node_modules/,
                loader: 'babel-loader',
                query: {
                    presets: ['react', 'es2015', 'stage-0']
                }
            }
        ]
    }
};

server.js

require('babel-register')({
    presets: ['react', 'es2015', 'stage-0']
});

var express = require('express');
var config = require('config');
var app = express();

var serverConfig = config.get('serverConfig');

app.use(express.static('public'));
app.use(require('./routes/index.jsx'));

app.listen(serverConfig.port, function () {
    console.log('FactoryWays server running on port ' + serverConfig.port);
    console.log('Press CTRL-C to stop the server.');
});

client.js

var ReactDOM = require('react-dom');
var React = require('react');
var routes = require('./routes/routes.jsx');
var Redux = require('redux');
var Provider = require('react-redux').Provider;

function reducer(state) { return state; }

var store = Redux.createStore(reducer, window.PROPS);

ReactDOM.render(
    <Provider store={store}>
        {routes}
    </Provider>, document
);

routes/index.jsx:

var router = require('express').Router();
var React = require('react');
var ReactDOMServer = require('react-dom/server');
var ReactRouter = require('react-router');
var Redux = require('redux');
var Provider = require('react-redux').Provider;

function reducer(state) { return state; }

router.get('*', function(request, response) {
    var initialState = { title: 'Universal React' };
    var store = Redux.createStore(reducer, initialState);

    ReactRouter.match({
        routes: require('./routes.jsx'),
        location: request.url
    }, function(error, redirectLocation, renderProps) {
        if (renderProps) {
            var html = ReactDOMServer.renderToString(
                <Provider store={store}>
                    <ReactRouter.RouterContext {...renderProps} />
                </Provider>
            );
            response.send(html);
        } else {
            response.status(404).send('Not Found');
        }
    });
});

module.exports = router;

routes/routes.jsx:

var React = require('react');
var ReactRouter = require('react-router');
var Router = ReactRouter.Router;
var Route = ReactRouter.Route;
var IndexRoute = ReactRouter.IndexRoute;
var browserHistory = ReactRouter.browserHistory;

module.exports = (
    <Router history={browserHistory}>
        <Route path='/' component={require('../views/Layout.jsx')}>
            <IndexRoute component={require('../views/Index.jsx')} />
        </Route>
    </Router>
);

views/Layout.jsx:

var React = require('react');
var Link = require('react-router').Link;
var connect = require('react-redux').connect;

var Layout = React.createClass({
    _handleClick: function() {
        alert();
    },
    render: function() {
        var custom = this.props.custom;
        return (
            <html>
                <head>
                    <title>{custom.title}</title>
                    <link rel='stylesheet' href='/style.css' />
                </head>
                <body>
                    <h1>{custom.title}</h1>
                    <p>Isn't server-side rendering remarkable?</p>
                    <button onClick={this._handleClick}>Click Me</button>
                    {this.props.children}
                    <ul>
                        <li>
                            <Link to='/'>Home</Link>
                        </li>
                        <li>
                            <Link to='/about'>About</Link>
                        </li>
                    </ul>
                    <script dangerouslySetInnerHTML={{
                        __html: 'window.PROPS=' + JSON.stringify(custom)
                    }} />
                    <script src='/bundle.js' />
                </body>
            </html>
        );
    }
});

var wrapper = connect(
    function(state) {
        return { custom: state };
    }
);

module.exports = wrapper(Layout);

Answer 1

Notice that I don't have a index.html file as react-router is choosing the proper JSX file to load

You still need one if you're running webpack-dev-server .

Webpack is used to bundle JavaScript together. That's it. In your case (based on your webpack.config.js file), it's outputting a bundle.js file in your public directory.

Webpack Dev Server is a simple static file server to aid development. It doesn't know anything about your server configuration in server.js .

Your two commands in your package.json require different setups:

npm start

npm start runs webpack-dev-server . By default, webpack-dev-server will serve the contents of your current directory, so you'll need to put your an index.html in the root directory of your project. The contents of index.html are simple: just boilerplate HTML that includes a script tag linking to your bundle.js file.

npm dev

When you're running npm dev however, you're rolling your own server, defined in server.js . In that case it's configured to generate and serve an index.html (as well as all the other static files you need) for you.

If you want to do hot-reloading and run your own server, you can add webpack-dev-middleware to your Express server.