React Router 4, How do I get a valid match url with route render or with withRouter? - react-router-v4

Question

The match object I receive using either the render property on the Route component or using an HOC from withRouter always produces a match object that is wrong. The location object is correct. The match url property is always '/'
Here is a code pen that shows the problem React Router 4 match woes
const { render } = ReactDOM
const {
HashRouter,
Route,
Link
} = ReactRouterDOM
const App = () => (
<HashRouter>
<div>
<AddressBar/>
<ul>
<li><Link to="/">Home</Link></li>
<li><Link to="/about">About</Link></li>
<li><Link to="/topics">Topics</Link></li>
</ul>
<hr/>
<Route exact path="/" component={Home}/>
<Route path="/about" component={About}/>
<Route path="/topics" component={Topics}/>
</div>
</HashRouter>
)
const Home = () => (
<div>
<h2>Home</h2>
</div>
)
const About = ({ match }) => (
<div>
<h2>About</h2>
<h3>Match: {match.url}</h3>
</div>
)
const Topics = ({ match }) => (
<div>
<h2>Topics</h2>
<ul>
<li><Link to={`${match.url}/rendering`}>Rendering with React</Link></li>
<li><Link to={`${match.url}/components`}>Components</Link></li>
<li><Link to={`${match.url}/props-v-state`}>Props v. State</Link></li>
</ul>
<Route path={`${match.url}/:topicId`} component={Topic}/>
<Route exact path={match.url} render={() => (
<h3>Please select a topic.</h3>
)}/>
</div>
)
const Topic = ({ match }) => (
<div>
<h3>{match.params.topicId}</h3>
<h3>Match: {match.url}</h3>
</div>
)
const AddressBar = () => (
<Route render={({ location: { pathname }, match: {url}, goBack, goForward }) => (
<div className="address-bar">
<div>
<button
className="ab-button"
onClick={goBack}
>◀︎</button>
</div>
<div>
<button
className="ab-button"
onClick={goForward}
>▶</button>
</div>
<div className="url">URL: {pathname} Match: {url}</div>
</div>
)}/>
)
render(<App/>, document.getElementById('root'))
Click on the About link (Topics has the same issue): notice the AddressBar, which uses Route render, at the top always shows
> Match: /
while at the bottom of the screen the Component displays the correct match.url
Match: /about
What am I doing wrong? How do I get a valid match object into the AddressBar?
Here is the ugly hack I used for my specific route where I need to know the specific 'league' parameter.
let keys = []
let path = '/*/:league/:id';
if (this.path.split('/').length === 3)
path = '/*/:league';
let re = pathToRegexp(path, keys);
const result = re.exec(this.path)
if (result && result[2])
this.store.setLeague(result[2]);

Answer 1

If I understand your question correctly you're looking to be able to use React Router's matching tools to pull paramaters out of a URL. This worked for me
import { matchPath } from 'react-router'
const match = matchPath('/users/123', {
path: '/users/:id',
exact: true,
strict: false
})
Source: https://github.com/ReactTraining/react-router/blob/master/packages/react-router/docs/api/matchPath.md

Answer 2

I guess whenever you need to use match, you also need to combine it with pathname
example
var match = this.props.match;
<Link className = 'xxx' to = {{pathname:match.url + '/target'}}