With react-router
I can use the Link
element to create links that are natively handled by react router.
I see internally it calls this.context.transitionTo(...)
.
I want to do a navigation, but not from a link, from a dropdown selection for example. How can I do this in code? What is this.context
?
I saw the Navigation
mixin, but can I do this without mixins?
Answer
React Router v5.1.0 with hooks
There is a new useHistory
hook in React Router >5.1.0 if you are using React >16.8.0 and functional components.
import { useHistory } from "react-router-dom";
function HomeButton() {
const history = useHistory();
function handleClick() {
history.push("/home");
}
return (
);
}
React Router v4
With v4 of React Router, there are three approaches that you can take to programmatic routing within components.
- Use the
withRouter
higher-order component. - Use composition and render a
- Use the
context
.
React Router is mostly a wrapper around the history
library. history
handles interaction with the browser's window.history
for you with its browser and hash histories. It also provides a memory history which is useful for environments that don't have a global history. This is particularly useful in mobile app development (react-native
) and unit testing with Node.
A history
instance has two methods for navigating: push
and replace
. If you think of the history
as an array of visited locations, push
will add a new location to the array and replace
will replace the current location in the array with the new one. Typically you will want to use the push
method when you are navigating.
In earlier versions of React Router, you had to create your own history
instance, but in v4 the
,
, and
components will create a browser, hash, and memory instances for you. React Router makes the properties and methods of the history
instance associated with your router available through the context, under the router
object.
1. Use the withRouter
higher-order component
The withRouter
higher-order component will inject the history
object as a prop of the component. This allows you to access the push
and replace
methods without having to deal with the context
.
import { withRouter } from 'react-router-dom'
// this also works with react-router-native
const Button = withRouter(({ history }) => (
type='button'
onClick={() => { history.push('/new-location') }}
>
Click Me!
))
2. Use composition and render a
The
component isn't just for matching locations. You can render a pathless route and it will always match the current location. The
component passes the same props as withRouter
, so you will be able to access the history
methods through the history
prop.
import { Route } from 'react-router-dom'
const Button = () => (
(
type='button'
onClick={() => { history.push('/new-location') }}
>
Click Me!
)} />
)
3. Use the context*
But you probably should not
The last option is one that you should only use if you feel comfortable working with React's context model. Although context is an option, it should be stressed that context is an unstable API and React has a section Why Not To Use Context in their documentation. So use at your own risk!
const Button = (props, context) => (
type='button'
onClick={() => {
// context.history.push === history.push
context.history.push('/new-location')
}}
>
Click Me!
)
// you need to specify the context type so that it
// is available within the component
Button.contextTypes = {
history: React.PropTypes.shape({
push: React.PropTypes.func.isRequired
})
}
1 and 2 are the simplest choices to implement, so for most use cases, they are your best bets.
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