useRemember
hook
Use the useRemember()
hook to save a local component state in the browser history.
Type Signature & Types
declare function useRemember<State>(initialState: State, key?: string): [State, Dispatch<SetStateAction<State>>]
Overview
When navigating browser history, Inertia restores pages using prop data cached in history state. However, Inertia does not restore local page component state since this is beyond its reach. This can lead to outdated pages in your browser history.
For example, if a user partially completes a form, then navigates away, and then returns back, the form will be reset and their work will be lost.
To mitigate this issue, you can tell Inertia which local component state to save in the browser history.
Saving local state
To save local component state to the history state, use the remember feature to tell Inertia which data it should remember.
import { useRemember } from '@inertiajs-revamped/preact'
export default function Profile() {
const [formState, setFormState] = useRemember({
first_name: null,
last_name: null,
// ...
})
// ...
}
Now, whenever your local form state changes, Inertia will automatically save this data to the history state and will also restore it on history navigation.
Multiple components
If your page contains multiple components that use the remember functionality provided by Inertia, you need to provide a unique key for each component so that Inertia knows which data to restore to each component.
import { useRemember } from '@inertiajs-revamped/preact'
export default function Profile() {
const [formState, setFormState] = useRemember({
first_name: null,
last_name: null,
}, 'users/create')
}
useRemember()
. If you have multiple instances of the same component on the page using the remember functionality, be sure to also include a unique key for each component instance, such as a model identifier.
import { useRemember } from '@inertiajs-revamped/preact'
export default function Profile() {
const [formState, setFormState] = useRemember({
first_name: props.user.first_name,
last_name: props.user.last_name,
}, `users/edit:${this.user.id}`)
}
Manually saving state
The hook watches for data changes and automatically save those changes to the history
state. Then, Inertia will restore the data on page load.
However, it's also possible to manage this manually using the underlying remember()
and restore()
methods in Inertia.
import { router } from '@inertiajs-revamped/preact'
router.remember(data, 'my-key')
// Restore local component state from history state...
let data = router.restore('my-key')