Reputation: 3338
I have to implement some business logic depending on browsing history.
What I want to do is something like this:
reactRouter.onUrlChange(url => {
this.history.push(url);
});
Is there any way to receive a callback from react-router when the URL gets updated?
Upvotes: 216
Views: 364004
Reputation: 2045
You can use the useLocation with componentDidUpdate
for getting the route change for class component and useEffect
for functional component
In Class component
import { useLocation } from "react-router";
class MainApp extends React.Component {
constructor(props) {
super(props);
}
async componentDidUpdate(prevProps) {
if(this.props.location.pathname !== prevProps.location.pathname)
{
//route has been changed. do something here
}
}
}
function App() {
const location = useLocation()
return <MainApp location={location} />
}
In functional component
function App() {
const location = useLocation()
useEffect(() => {
//route change detected. do something here
}, [location]) //add location in dependency. It detects the location change
return <Routes>
<Route path={"/"} element={<Home/>} >
<Route path={"login"} element={<Login/>} />
</Routes>
}
Upvotes: 2
Reputation: 459
Use the useLocation()
Hook to detect the URL change and put it in dependency array in useEffect()
this trick worked for me
const App = () => {
const location = useLocation();
useEffect(() => {
window.scroll(0,0);
}, [location]);
return (
<React.Fragment>
<Routes>
<Route path={"/"} element={<Template/>} >
<Route index={true} element={<Home/>} />
<Route path={"cart"} element={<Cart/>} />
<Route path={"signin"} element={<Signin/>} />
<Route path={"signup"} element={<Signup/>} />
<Route path={"product/:slug"} element={<Product/>} />
<Route path={"category/:category"} element={<ProductList/>} />
</Route>
</Routes>
</React.Fragment>
);
}
export default App;
Upvotes: 3
Reputation: 2287
import { useEffect } from 'react';
import { useLocation } from 'react-router-dom';
function SomeComponent() {
const location = useLocation();
useEffect(() => {
console.log('Location changed');
}, [location]);
...
}
Upvotes: 202
Reputation: 31015
react-router v6
In react-router v6, this can be done by combining the useLocation
and useEffect
hooks
import { useLocation } from 'react-router-dom';
const MyComponent = () => {
const location = useLocation()
React.useEffect(() => {
// runs on location, i.e. route, change
console.log('handle route change here', location)
}, [location])
...
}
For convenient reuse, you can do this in a custom useLocationChange
hook
// runs action(location) on location, i.e. route, change
const useLocationChange = (action) => {
const location = useLocation()
React.useEffect(() => { action(location) }, [location])
}
const MyComponent1 = () => {
useLocationChange((location) => {
console.log('handle route change here', location)
})
...
}
const MyComponent2 = () => {
useLocationChange((location) => {
console.log('and also here', location)
})
...
}
If you also need to see the previous route on change, you can combine with a usePrevious
hook
const usePrevious = (value) => {
const ref = React.useRef()
React.useEffect(() => { ref.current = value })
return ref.current
}
const useLocationChange = (action) => {
const location = useLocation()
const prevLocation = usePrevious(location)
React.useEffect(() => {
action(location, prevLocation)
}, [location])
}
const MyComponent1 = () => {
useLocationChange((location, prevLocation) => {
console.log('changed from', prevLocation, 'to', location)
})
...
}
It's important to note that all the above fire on the first client route being mounted, as well as subsequent changes. If that's a problem, use the latter example and check that a prevLocation
exists before doing anything.
Upvotes: 139
Reputation: 21
import React from 'react';
import { BrowserRouter as Router, Switch, Route } from 'react-router-dom';
import Sidebar from './Sidebar';
import Chat from './Chat';
<Router>
<Sidebar />
<Switch>
<Route path="/rooms/:roomId" component={Chat}>
</Route>
</Switch>
</Router>
import { useHistory } from 'react-router-dom';
function SidebarChat(props) {
**const history = useHistory();**
var openChat = function (id) {
**//To navigate**
history.push("/rooms/" + id);
}
}
**//To Detect the navigation change or param change**
import { useParams } from 'react-router-dom';
function Chat(props) {
var { roomId } = useParams();
var roomId = props.match.params.roomId;
useEffect(() => {
//Detect the paramter change
}, [roomId])
useEffect(() => {
//Detect the location/url change
}, [location])
}
Upvotes: 1
Reputation: 282160
You can make use of history.listen()
function when trying to detect the route change. Considering you are using react-router v4
, wrap your component with withRouter
HOC to get access to the history
prop.
history.listen()
returns an unlisten
function. You'd use this to unregister
from listening.
You can configure your routes like
index.js
ReactDOM.render(
<BrowserRouter>
<AppContainer>
<Route exact path="/" Component={...} />
<Route exact path="/Home" Component={...} />
</AppContainer>
</BrowserRouter>,
document.getElementById('root')
);
and then in AppContainer.js
class App extends Component {
componentWillMount() {
this.unlisten = this.props.history.listen((location, action) => {
console.log("on route change");
});
}
componentWillUnmount() {
this.unlisten();
}
render() {
return (
<div>{this.props.children}</div>
);
}
}
export default withRouter(App);
From the history docs:
You can listen for changes to the current location using
history.listen
:history.listen((location, action) => { console.log(`The current URL is ${location.pathname}${location.search}${location.hash}`) console.log(`The last navigation action was ${action}`) })
The location object implements a subset of the window.location interface, including:
**location.pathname** - The path of the URL **location.search** - The URL query string **location.hash** - The URL hash fragment
Locations may also have the following properties:
location.state - Some extra state for this location that does not reside in the URL (supported in
createBrowserHistory
andcreateMemoryHistory
)
location.key
- A unique string representing this location (supported increateBrowserHistory
andcreateMemoryHistory
)The action is one of
PUSH, REPLACE, or POP
depending on how the user got to the current URL.
When you are using react-router v3 you can make use of history.listen()
from history
package as mentioned above or you can also make use browserHistory.listen()
You can configure and use your routes like
import {browserHistory} from 'react-router';
class App extends React.Component {
componentDidMount() {
this.unlisten = browserHistory.listen( location => {
console.log('route changes');
});
}
componentWillUnmount() {
this.unlisten();
}
render() {
return (
<Route path="/" onChange={yourHandler} component={AppContainer}>
<IndexRoute component={StaticContainer} />
<Route path="/a" component={ContainerA} />
<Route path="/b" component={ContainerB} />
</Route>
)
}
}
Upvotes: 184
Reputation: 2059
React Router V5
If you want the pathName as a string ('/' or 'users'), you can use the following:
// React Hooks: React Router DOM
let history = useHistory();
const location = useLocation();
const pathName = location.pathname;
Upvotes: -1
Reputation: 729
This is an old question and I don't quite understand the business need of listening for route changes to push a route change; seems roundabout.
BUT if you ended up here because all you wanted was to update the 'page_path'
on a react-router route change for google analytics / global site tag / something similar, here's a hook you can now use. I wrote it based on the accepted answer:
useTracking.js
import { useEffect } from 'react'
import { useHistory } from 'react-router-dom'
export const useTracking = (trackingId) => {
const { listen } = useHistory()
useEffect(() => {
const unlisten = listen((location) => {
// if you pasted the google snippet on your index.html
// you've declared this function in the global
if (!window.gtag) return
window.gtag('config', trackingId, { page_path: location.pathname })
})
// remember, hooks that add listeners
// should have cleanup to remove them
return unlisten
}, [trackingId, listen])
}
You should use this hook once in your app, somewhere near the top but still inside a router. I have it on an App.js
that looks like this:
App.js
import * as React from 'react'
import { BrowserRouter, Route, Switch } from 'react-router-dom'
import Home from './Home/Home'
import About from './About/About'
// this is the file above
import { useTracking } from './useTracking'
export const App = () => {
useTracking('UA-USE-YOURS-HERE')
return (
<Switch>
<Route path="/about">
<About />
</Route>
<Route path="/">
<Home />
</Route>
</Switch>
)
}
// I find it handy to have a named export of the App
// and then the default export which wraps it with
// all the providers I need.
// Mostly for testing purposes, but in this case,
// it allows us to use the hook above,
// since you may only use it when inside a Router
export default () => (
<BrowserRouter>
<App />
</BrowserRouter>
)
Upvotes: 13
Reputation: 34367
I came across this question as I was attempting to focus the ChromeVox screen reader to the top of the "screen" after navigating to a new screen in a React single page app. Basically trying to emulate what would happen if this page was loaded by following a link to a new server-rendered web page.
This solution doesn't require any listeners, it uses withRouter()
and the componentDidUpdate()
lifecycle method to trigger a click to focus ChromeVox on the desired element when navigating to a new url path.
I created a "Screen" component which is wrapped around the react-router switch tag which contains all the apps screens.
<Screen>
<Switch>
... add <Route> for each screen here...
</Switch>
</Screen>
Screen.tsx
ComponentNote: This component uses React + TypeScript
import React from 'react'
import { RouteComponentProps, withRouter } from 'react-router'
class Screen extends React.Component<RouteComponentProps> {
public screen = React.createRef<HTMLDivElement>()
public componentDidUpdate = (prevProps: RouteComponentProps) => {
if (this.props.location.pathname !== prevProps.location.pathname) {
// Hack: setTimeout delays click until end of current
// event loop to ensure new screen has mounted.
window.setTimeout(() => {
this.screen.current!.click()
}, 0)
}
}
public render() {
return <div ref={this.screen}>{this.props.children}</div>
}
}
export default withRouter(Screen)
I had tried using focus()
instead of click()
, but click causes ChromeVox to stop reading whatever it is currently reading and start again where I tell it to start.
Advanced note: In this solution, the navigation <nav>
which inside the Screen component and rendered after the <main>
content is visually positioned above the main
using css order: -1;
. So in pseudo code:
<Screen style={{ display: 'flex' }}>
<main>
<nav style={{ order: -1 }}>
<Screen>
If you have any thoughts, comments, or tips about this solution, please add a comment.
Upvotes: 1
Reputation: 18556
If you want to listen to the history
object globally, you'll have to create it yourself and pass it to the Router
. Then you can listen to it with its listen()
method:
// Use Router from react-router, not BrowserRouter.
import { Router } from 'react-router';
// Create history object.
import createHistory from 'history/createBrowserHistory';
const history = createHistory();
// Listen to history changes.
// You can unlisten by calling the constant (`unlisten()`).
const unlisten = history.listen((location, action) => {
console.log(action, location.pathname, location.state);
});
// Pass history to Router.
<Router history={history}>
...
</Router>
Even better if you create the history object as a module, so you can easily import it anywhere you may need it (e.g. import history from './history';
Upvotes: 19