[javascript] React-Router: No Not Found Route?

Consider the following:

var AppRoutes = [
    <Route handler={App} someProp="defaultProp">
        <Route path="/" handler={Page} />
    </Route>,

    <Route  handler={App} someProp="defaultProp">
        <Route path="/" handler={Header} >
            <Route path="/withheader" handler={Page} />
        </Route>
    </Route>,

    <Route handler={App} someProp="defaultProp">
        <Route path=":area" handler={Area} />
        <Route path=":area/:city" handler={Area} />
        <Route path=":area/:city/:locale" handler={Area} />
        <Route path=":area/:city/:locale/:type" handler={Area} />
    </Route>
];

I have an App Template, a HeaderTemplate, and Parameterized set of routes with the same handler (within App template). I want to be able to serve 404 routes when something is not found. For example, /CA/SanFrancisco should be found and handled by Area, whereas /SanFranciscoz should 404.

Here's how I quickly test the routes.

['', '/', '/withheader', '/SanFranciscoz', '/ca', '/CA', '/CA/SanFrancisco', '/CA/SanFrancisco/LowerHaight', '/CA/SanFrancisco/LowerHaight/condo'].forEach(function(path){
    Router.run(AppRoutes, path, function(Handler, state){
        var output = React.renderToString(<Handler/>);
        console.log(output, '\n');
    });
});

The problem is /SanFranciscoz is always being handled by the Area page, but I want it to 404. Also, if I add a NotFoundRoute to the first route configuration, all the Area pages 404.

<Route handler={App} someProp="defaultProp">
    <Route path="/" handler={Page} />
    <NotFoundRoute handler={NotFound} />
</Route>,

What am I doing wrong?

Here's a gist that can be downloaded and experimented on.

https://gist.github.com/adjavaherian/aa48e78279acddc25315

This answer is for react-router-4. You can wrap all the routes in Switch block, which functions just like the switch-case expression, and renders the component with the first matched route. eg)

<Switch>
      <Route path="/" component={home}/>
      <Route path="/home" component={home}/>
      <Route component={GenericNotFound}/> {/* The Default not found component */}
</Switch>

When to use exact

Without exact:

<Route path='/home'
       component = {Home} />

{/* This will also work for cases like https://<domain>/home/anyvalue. */}

With exact:

<Route exact path='/home'
       component = {Home} />

{/* 
     This will NOT work for cases like https://<domain>/home/anyvalue. 
     Only for https://<url>/home and https://<domain>/home/
*/}

Now if you are accepting routing parameters, and if it turns out incorrect, you can handle it in the target component itself. eg)

<Route exact path='/user/:email'
       render = { (props) => <ProfilePage {...props} user={this.state.user} />} />

Now in ProfilePage.js

if(this.props.match.params.email != desiredValue)
{
   <Redirect to="/notFound" component = {GenericNotFound}/>
   //Or you can show some other component here itself.
}

For more details you can go through this code:

App.js

ProfilePage.js

According to the documentation, the route was found, even though the resource wasn't.

Note: This is not intended to be used for when a resource is not found. There is a difference between the router not finding a matched path and a valid URL that results in a resource not being found. The url courses/123 is a valid url and results in a matched route, therefore it was "found" as far as routing is concerned. Then, if we fetch some data and discover that the course 123 does not exist, we do not want to transition to a new route. Just like on the server, you go ahead and serve the url but render different UI (and use a different status code). You shouldn't ever try to transition to a NotFoundRoute.

So, you could always add a line in the Router.run() before React.render() to check if the resource is valid. Just pass a prop down to the component or override the Handler component with a custom one to display the NotFound view.

In newer versions of react-router you want to wrap the routes in a Switch which only renders the first matched component. Otherwise you would see multiple components rendered.

For example:

import React from 'react';
import ReactDOM from 'react-dom';
import {
  BrowserRouter as Router,
  Route,
  browserHistory,
  Switch
} from 'react-router-dom';

import App from './app/App';
import Welcome from './app/Welcome';
import NotFound from './app/NotFound';

const Root = () => (
  <Router history={browserHistory}>
    <Switch>
      <Route exact path="/" component={App}/>
      <Route path="/welcome" component={Welcome}/>
      <Route component={NotFound}/>
    </Switch>
  </Router>
);

ReactDOM.render(
  <Root/>,
  document.getElementById('root')
);

I just had a quick look at your example, but if i understood it the right way you're trying to add 404 routes to dynamic segments. I had the same issue a couple of days ago, found #458 and #1103 and ended up with a hand made check within the render function:

if (!place) return <NotFound />;

hope that helps!

With the new version of React Router (using 2.0.1 now), you can use an asterisk as a path to route all 'other paths'.

So it would look like this:

<Route route="/" component={App}>
    <Route path=":area" component={Area}>
        <Route path=":city" component={City} />
        <Route path=":more-stuff" component={MoreStuff} />    
    </Route>
    <Route path="*" component={NotFoundRoute} />
</Route>