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[v1.0.1]

Dec 5, 2015

• Support IE8 (#2540)
• Add ES2015 module build (#2530)

v1.0.0

Nov 9, 2015

Thanks for your patience :) Big changes from v0.13.x to 1.0. While on the surface a lot of this just looks like shuffling around API, the entire codebase has been rewritten to handle some really great use cases, like loading routes and components on demand, session-based route matching, server rendering, integration with libs like redux and relay, and lots more.

But for now, here's how to translate the old API to the new one.

Importing

The new Router component is a property of the top-level module.

// v0.13.x
var Router = require('react-router');
var Route = Router.Route;

// v1.0
var ReactRouter = require('react-router');
var Router = ReactRouter.Router;
var Route = ReactRouter.Route;

// or using ES Modules
import { Router, Route } from 'react-router';

Rendering

// v0.13.x
Router.run(routes, (Handler) => {
  render(<Handler/>, el);
})

// v1.0
render(<Router>{routes}</Router>, el)

// looks more like this:
render((
  <Router>
    <Route path="/" component={App}/>
  </Router>
), el);

// or if you'd rather
render(<Router routes={routes}/>, el)

Locations

Locations are now called histories (that emit locations). You import them from the history package, not react router.

// v0.13.x
Router.run(routes, Router.BrowserHistory, (Handler) => {
  render(<Handler/>, el);
})

// v1.0
import createBrowserHistory from 'history/lib/createBrowserHistory'
let history = createBrowserHistory()
render(<Router history={history}>{routes}</Router>, el)

If you do not specify a history type (as in the example above) then you will notice some unusual behaviour after updating to 1.0.0. With the default hash based routing a querystring entry not defined by yourself will start appearing in your URLs called _k. An example of how it looks is this: ?_k=umhx1s

This is intended and part of createHashHistory (which is the default history approach used if one is not specified). You can read more about the feature here and how to opt out here.

Route Config

You can still nest your routes as before, paths are inherited from parents just like before but prop names have changed.

// v0.13.x
<Route name="about" handler={About}/>

// v1.0
<Route path="about" component={About}/>

Named routes are gone (for now, see discussion)

NotFound route

Not found really confused people, mistaking not finding resources from your API for not matching a route. We've removed it completely since it's simple with a * path.

// v0.13.x
<NotFoundRoute handler={NoMatch}/>

// v1.0
<Route path="*" component={NoMatch}/>

Redirect route

// v0.13.x
<Redirect from="some/where/:id" to="somewhere/else/:id" params={{id: 2}}/>

// v1.0
// Works the same as before, except no params, just put them in the path
<Redirect from="/some/where/:id" to="/somewhere/else/2"/>

Links

path / params

// v0.13.x
<Link to="user" params={{userId: user.id}}>Mateusz</Link>

// v1.0
// because named routes are gone, link to full paths, you no longer need
// to know the names of the parameters, and string templates are quite
// nice. Note that `query` has not changed.
<Link to={`/users/${user.id}`}>Mateusz</Link>

"active" class

In 0.13.x links added the "active" class by default which you could override with activeClassName, or provide activeStyles. It's usually just a handful of navigation links that need this behavior.

Links no longer add the "active" class by default (its expensive and usually not necessary), you opt-in by providing one; if no activeClassName or activeStyles are provided, the link will not check if it's active.

// v0.13.x
<Link to="about">About</Link>

// v1.0
<Link to="/about" activeClassName="active">About</Link>

Linking to Index routes

Because named routes are gone, a link to / with an index route at / will always be active. So we've introduced IndexLink that is only active when on exactly that path.

// v0.13.x
// with this route config
<Route path="/" handler={App}>
  <DefaultRoute name="home" handler={Home}/>
  <Route name="about" handler={About}/>
</Route>

// will be active only when home is active, not when about is active
<Link to="home">Home</Link>

// v1.0
<Route path="/" component={App}>
  <IndexRoute component={Home}/>
  <Route path="about" component={About}/>
</Route>

// will be active only when home is active, not when about is active
<IndexLink to="/">Home</IndexLink>

This gives you more granular control of what causes a link to be active or not when there is an index route involved.

onClick handler

For consistency with React v0.14, returning false from a Link's onClick handler no longer prevents the transition. To prevent the transition, call e.preventDefault() instead.

RouteHandler

RouteHandler is gone. Router now automatically populates this.props.children of your components based on the active route.

// v0.13.x
<RouteHandler/>
<RouteHandler someExtraProp={something}/>

// v1.0
{this.props.children}
{React.cloneElement(this.props.children, {someExtraProp: something})}

There's a small semantic change with this approach. React validates propTypes on elements when those elements are created, rather than when they're about to render. This means that any props with isRequired will fail validation when those props are supplied via this approach. In these cases, you should not specify isRequired for those props. For more details, see facebook/react#4494.

Navigation Mixin

If you were using the Navigation mixin, use the History mixin instead.

// v0.13.x
var Assignment = React.createClass({
  mixins: [ Navigation ],
  navigateAfterSomethingHappened () {
    this.transitionTo('/users', { userId: user.id }, query);
    // this.replaceWith('/users', { userId: user.id }, query);
  }
})

// v1.0
var Assignment = React.createClass({
  mixins: [ History ],
  navigateAfterSomethingHappened () {
    // the router is now built on rackt/history, and it is a first class
    // API in the router for navigating
    this.history.pushState(null, `/users/${user.id}`, query);
    // this.history.replaceState(null, `/users/${user.id}`, query);
  }
})

The following Navigation methods are now also found on the history object, main difference again is there are no params or route names, just pathnames.

State mixin

// v0.13.x
var Assignment = React.createClass({
  mixins: [ State ],
  foo () {
    this.getPath()
    this.getParams()
    // etc...
  }
})

// v1.0
// if you are a route component...
<Route component={Assignment} />

var Assignment = React.createClass({
  foo () {
    this.props.location // contains path information
    this.props.params // contains params
    this.props.history.isActive('/pathToAssignment')
  }
})

// if you're not a route component, you need to pass location down the
// tree or get the location from context. We will probably provide a
// higher order component that will do this for you but haven't yet.
// see further down for more information on what can be passed down
// via context
var Assignment = React.createClass({
  contextTypes: {
    location: React.PropTypes.object
  },
  foo () {
    this.context.location
  }
})

Here's a table of where you used to get stuff with the State mixin, and where you get it now if you're a route component (this.props)

Here is another table of properties you used to get via the State and where you can get it now if you are not a route component (this.context).

Note not all State functionality can be accessed via context in v1.0. For example, params is not available via context.

Scrolling

We're developing scroll behaviors separately in the scroll-behavior library until we have a stable, robust implementation that we're happy with. Currently, scroll behaviors are exposed there as history enhancers:

import createHistory from 'history/lib/createBrowserHistory'
import useScroll from 'scroll-behavior/lib/useStandardScroll'

const history = useScroll(createHistory)()

willTransitionTo and willTransitionFrom

Routes now define this behavior:

// v0.13.x
var Home = React.createClass({
  statics: {
    willTransitionTo (transition, params, query, callback) { }
    willTransitionFrom (component, transition, params, query, callback) { }
  }
})

// v1.0
<Route
  component={Home}
  onEnter={(location, replaceWith) => {}}
  onLeave={() => {}}
/>

To cancel a "transition from", please refer to the Confirming Navigation guide.

We'll keep updating this

There's a lot of the old API we've missed, please give the new docs a read and help us fill this guide in. Thanks!