Introduction Back

Think about a case that without refreshing, how can we keep the URL in sync with contents in a page?

React Router is used to help adding new screens and flows to our application, while keeping the URL in sync with what's being displayed on the page.

Without React Router

If we don't use React Router, we are supposed to complete this requirement with window.location.hash.

import React from 'react';
import ReactDOM from 'react-dom';

const About = React.createClass({/*...*/});
const Inbox = React.createClass({/*...*/});
const Home = React.createClass({/*...*/});

export class App extends React.Component {
    constructor(props) {
        super(props);

        this.state = { route: window.location.hash.substr(1) };
    }

    componentDidMount() {
        window.addEventListener('hashchange', () => {
            this.setState({
                route: window.location.hash.substr(1)
            });
        });
    }

    render() {
        let Child;

        switch (this.state.route) {
            case '/about':
                Child = About;
                break;
            case '/inbox':
                Child = Inbox;
                break;
            default:
                Child = Home;
                break;
        }

        return (
            <div>
                <h1>App</h1>
                <ul>
                    <li><a href="#/about">About</a></li>
                    <li><a href="#/inbox">Inbox</a></li>
                </ul>
                <Child />
            </div>
        );
    }
}

ReactDOM.render(
    <App />,
    document.getElementById('content')
);

Imagine now that Inbox component has some neted UI at different URLs, maybe something like this master detail view:

path: /inbox/messages/1234

+---------+------------+------------------------+
| About   |    Inbox   |                        |
+---------+            +------------------------+
| Compose    Reply    Reply All    Archive      |
+-----------------------------------------------+
|Movie tomorrow|                                |
+--------------+   Subject: TPS Report          |
|TPS Report        From:    boss@big.co         |
+--------------+                                |
|New Pull Reque|   So ...                       |
+--------------+                                |
|...           |                                |
+--------------+--------------------------------+

And maybe a stats page when not viewing a message:

path: /inbox

+---------+------------+------------------------+
| About   |    Inbox   |                        |
+---------+            +------------------------+
| Compose    Reply    Reply All    Archive      |
+-----------------------------------------------+
|Movie tomorrow|                                |
+--------------+   10 Unread Messages           |
|TPS Report    |   22 drafts                    |
+--------------+                                |
|New Pull Reque|                                |
+--------------+                                |
|...           |                                |
+--------------+--------------------------------+

That's why we use React Router to help us parsing URL in a smart way.

With React Router

import React from 'react';
import ReactDOM from 'react-dom';

/** First we import some modules... */
import { Router, Route, IndexRoute, Link, hashHistory } from 'react-router';

export class App extends React.Component {
    render() {
        return (
            <div>
                <h1>App</h1>
                <ul>
                    <li><Link to="/about">About</Link></li>
                    <li><Link to="/inbox">Inbox</Link></li>
                </ul>
                {this.props.children}
            </div>
        );
    }
}

/**
 * Finally, we render a <Router> with some <Route>s.
 * It does all the fancy routing stuff for us.
 */
ReactDOM.render(
    <Router history={hashHistory}>
        <Route path="/" component={App}>
            <IndexRoute component={Home}></IndexRoute>
            <Route path="about" component={About}></Route>
            <Route path="inbox" component={Inbox}></Route>
        </Route>
    </Router>,
    document.getElementById('content')
);

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