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added delay_during_hydration option to UseStorageOptions.

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Fixes #108
This commit is contained in:
Maccesch 2024-06-05 11:21:25 +02:00
parent 1b3889376b
commit 1771d3ac07
5 changed files with 126 additions and 50 deletions
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14
CHANGELOG.md
View file

@ -3,6 +3,20 @@
The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
## [Unreleased]
### Changes 🔥
- `ElementMaybeSignal` is now implemented for `websys::HtmlElement` (thanks to @blorbb).
- `UseStorageOptions` now has `delay_during_hydration` which has to be used when you conditionally show parts of
the DOM controlled by a value from storage. This leads to hydration errors which can be fixed by setting this new
option to `true`.
### Breaking Changes 🛠
- `UseStorageOptions` no longer accepts a `codec` value because this is already provided as a generic parameter to
the respective function calls.
## [0.10.10] - 2024-05-10
### Change 🔥

11
examples/ssr/src/app.rs
View file

@ -3,7 +3,7 @@ use leptos::ev::{keypress, KeyboardEvent};
use leptos::*;
use leptos_meta::*;
use leptos_router::*;
use leptos_use::storage::use_local_storage;
use leptos_use::storage::{use_local_storage, use_local_storage_with_options, UseStorageOptions};
use leptos_use::utils::FromToStringCodec;
use leptos_use::{
use_color_mode_with_options, use_cookie_with_options, use_debounce_fn, use_event_listener,
@ -40,7 +40,10 @@ pub fn App() -> impl IntoView {
#[component]
fn HomePage() -> impl IntoView {
// Creates a reactive value to update the button
let (count, set_count, _) = use_local_storage::<i32, FromToStringCodec>("count-state");
let (count, set_count, _) = use_local_storage_with_options::<i32, FromToStringCodec>(
"count-state",
UseStorageOptions::default().delay_during_hydration(true),
);
let on_click = move |_| set_count.update(|count| *count += 1);
let nf = use_intl_number_format(
@ -96,6 +99,10 @@ fn HomePage() -> impl IntoView {
<p>Dark preferred: {is_dark_preferred}</p>
<LocalStorageTest/>
<p>Test cookie: {move || test_cookie().unwrap_or("<Expired>".to_string())}</p>
<Show when={move || count() > 0 }>
<div>Greater than 0 </div>
</Show>
}
}

8
src/storage/use_local_storage.rs
View file

@ -17,21 +17,21 @@ where
T: Clone + Default + PartialEq,
C: StringCodec<T> + Default,
{
use_storage_with_options(
use_storage_with_options::<T, C>(
StorageType::Local,
key,
UseStorageOptions::<T, C>::default(),
UseStorageOptions::<T, C::Error>::default(),
)
}
/// Accepts [`UseStorageOptions`]. See [`use_local_storage`] for details.
pub fn use_local_storage_with_options<T, C>(
key: impl AsRef<str>,
options: UseStorageOptions<T, C>,
options: UseStorageOptions<T, C::Error>,
) -> (Signal<T>, WriteSignal<T>, impl Fn() + Clone)
where
T: Clone + PartialEq,
C: StringCodec<T> + Default,
{
use_storage_with_options(StorageType::Local, key, options)
use_storage_with_options::<T, C>(StorageType::Local, key, options)
}

8
src/storage/use_session_storage.rs
View file

@ -17,21 +17,21 @@ where
T: Clone + Default + PartialEq,
C: StringCodec<T> + Default,
{
use_storage_with_options(
use_storage_with_options::<T, C>(
StorageType::Session,
key,
UseStorageOptions::<T, C>::default(),
UseStorageOptions::<T, C::Error>::default(),
)
}
/// Accepts [`UseStorageOptions`]. See [`use_session_storage`] for details.
pub fn use_session_storage_with_options<T, C>(
key: impl AsRef<str>,
options: UseStorageOptions<T, C>,
options: UseStorageOptions<T, C::Error>,
) -> (Signal<T>, WriteSignal<T>, impl Fn() + Clone)
where
T: Clone + PartialEq,
C: StringCodec<T> + Default,
{
use_storage_with_options(StorageType::Session, key, options)
use_storage_with_options::<T, C>(StorageType::Session, key, options)
}

135
src/storage/use_storage.rs
View file

@ -2,7 +2,8 @@ use crate::{
core::{MaybeRwSignal, StorageType},
utils::{FilterOptions, StringCodec},
};
use cfg_if::cfg_if;
use default_struct_builder::DefaultBuilder;
use leptos::leptos_dom::HydrationCtx;
use leptos::*;
use std::rc::Rc;
use thiserror::Error;
@ -39,6 +40,7 @@ const INTERNAL_STORAGE_EVENT: &str = "leptos-use-storage";
/// # use serde::{Deserialize, Serialize};
/// # use leptos_use::utils::{FromToStringCodec, JsonCodec, ProstCodec};
/// #
/// # #[component]
/// # pub fn Demo() -> impl IntoView {
/// // Binds a struct:
/// let (state, set_state, _) = use_local_storage::<MyState, JsonCodec>("my-state");
@ -86,6 +88,64 @@ const INTERNAL_STORAGE_EVENT: &str = "leptos-use-storage";
/// ## Server-Side Rendering
///
/// On the server the returned signals will just read/manipulate the `initial_value` without persistence.
///
/// ### Hydration bugs and `use_cookie`
///
/// If you use a value from storage to control conditional rendering you might run into issues with
/// hydration.
///
/// ```
/// # use leptos::*;
/// # use leptos_use::storage::use_local_storage;
/// # use leptos_use::utils::FromToStringCodec;
/// #
/// # #[component]
/// # pub fn Example() -> impl IntoView {
/// let (flag, set_flag, _) = use_session_storage::<bool, FromToStringCodec>("my-flag");
///
/// view! {
/// <Show when=move || flag()>
/// <div>Some conditional content</div>
/// </Show>
/// }
/// # }
/// ```
///
/// You can see hydration warnings in the browser console and the conditional parts of
/// the app might never show up when rendered on the server and then hydrated in the browser. The
/// reason for this is that the server has no access to storage and therefore will always use
/// `initial_value` as described above. So on the server your app is always rendered as if
/// the value from storage was `initial_value`. Then in the browser the actual stored value is used
/// which might be different, hence during hydration the DOM looks different from the one rendered
/// on the server which produces the hydration warnings.
///
/// The recommended way to avoid this is to use `use_cookie` instead because values stored in cookies
/// are available on the server as well as in the browser.
///
/// If you still want to use storage instead of cookies you can use the `delay_during_hydration`
/// option that will use the `initial_value` during hydration just as on the server and delay loading
/// the value from storage by an animation frame. This gets rid of the hydration warnings and makes
/// the app correctly render things. Some flickering might be unavoidable though.
///
/// ```
/// # use leptos::*;
/// # use leptos_use::storage::{use_local_storage_with_options, UseStorageOptions};
/// # use leptos_use::utils::FromToStringCodec;
/// #
/// # #[component]
/// # pub fn Example() -> impl IntoView {
/// let (flag, set_flag, _) = use_session_storage_with_options::<bool, FromToStringCodec>(
/// "my-flag",
/// UseStorageOptions::default().delay_during_hydration(true),
/// );
///
/// view! {
/// <Show when=move || flag()>
/// <div>Some conditional content</div>
/// </Show>
/// }
/// # }
/// ```
#[inline(always)]
pub fn use_storage<T, C>(
storage_type: StorageType,
@ -102,24 +162,27 @@ where
pub fn use_storage_with_options<T, C>(
storage_type: StorageType,
key: impl AsRef<str>,
options: UseStorageOptions<T, C>,
options: UseStorageOptions<T, C::Error>,
) -> (Signal<T>, WriteSignal<T>, impl Fn() + Clone)
where
T: Clone + PartialEq,
C: StringCodec<T> + Default,
{
let UseStorageOptions {
codec,
on_error,
listen_to_storage_changes,
initial_value,
filter,
delay_during_hydration,
} = options;
let codec = C::default();
let (data, set_data) = initial_value.into_signal();
let default = data.get_untracked();
cfg_if! { if #[cfg(feature = "ssr")] {
#[cfg(feature = "ssr")]
{
let _ = codec;
let _ = on_error;
let _ = listen_to_storage_changes;
@ -128,13 +191,15 @@ where
let _ = key;
let _ = INTERNAL_STORAGE_EVENT;
let remove = move || {
set_data.set(default.clone());
};
(data.into(), set_data, remove)
} else {
}
#[cfg(not(feature = "ssr"))]
{
use crate::{use_event_listener, use_window, watch_with_options, WatchOptions};
// Get storage API
@ -176,6 +241,7 @@ where
let codec = codec.to_owned();
let key = key.as_ref().to_owned();
let on_error = on_error.to_owned();
move || {
let fetched = storage
.to_owned()
@ -212,7 +278,11 @@ where
};
// Fetch initial value
fetch_from_storage();
if delay_during_hydration && HydrationCtx::is_hydrating() {
request_animation_frame(fetch_from_storage.clone());
} else {
fetch_from_storage();
}
// Fires when storage needs to be fetched
let notify = create_trigger();
@ -306,7 +376,7 @@ where
};
(data, set_data, remove)
}}
}
}
/// Session handling errors returned by [`use_storage_with_options`].
@ -329,17 +399,26 @@ pub enum UseStorageError<Err> {
}
/// Options for use with [`use_local_storage_with_options`], [`use_session_storage_with_options`] and [`use_storage_with_options`].
pub struct UseStorageOptions<T: 'static, C: StringCodec<T>> {
// Translates to and from UTF-16 strings
codec: C,
#[derive(DefaultBuilder)]
pub struct UseStorageOptions<T, Err>
where
T: 'static,
{
// Callback for when an error occurs
on_error: Rc<dyn Fn(UseStorageError<C::Error>)>,
#[builder(skip)]
on_error: Rc<dyn Fn(UseStorageError<Err>)>,
// Whether to continuously listen to changes from browser storage
listen_to_storage_changes: bool,
// Initial value to use when the storage key is not set
#[builder(skip)]
initial_value: MaybeRwSignal<T>,
// Debounce or throttle the writing to storage whenever the value changes
#[builder(into)]
filter: FilterOptions,
/// Delays the reading of the value from storage by one animation frame during hydration.
/// This ensures that during hydration the value is the initial value just like it is on the server
/// which helps prevent hydration errors. Defaults to `false`.
delay_during_hydration: bool,
}
/// Calls the on_error callback with the given error. Removes the error from the Result to avoid double error handling.
@ -351,43 +430,27 @@ fn handle_error<T, Err>(
result.map_err(|err| (on_error)(err))
}
impl<T: Default, C: StringCodec<T> + Default> Default for UseStorageOptions<T, C> {
impl<T: Default, Err> Default for UseStorageOptions<T, Err> {
fn default() -> Self {
Self {
codec: C::default(),
on_error: Rc::new(|_err| ()),
listen_to_storage_changes: true,
initial_value: MaybeRwSignal::default(),
filter: FilterOptions::default(),
delay_during_hydration: false,
}
}
}
impl<T: Default, C: StringCodec<T>> UseStorageOptions<T, C> {
/// Sets the codec to use for encoding and decoding values to and from UTF-16 strings.
pub fn codec(self, codec: impl Into<C>) -> Self {
Self {
codec: codec.into(),
..self
}
}
impl<T: Default, Err> UseStorageOptions<T, Err> {
/// Optional callback whenever an error occurs.
pub fn on_error(self, on_error: impl Fn(UseStorageError<C::Error>) + 'static) -> Self {
pub fn on_error(self, on_error: impl Fn(UseStorageError<Err>) + 'static) -> Self {
Self {
on_error: Rc::new(on_error),
..self
}
}
/// Listen to changes to this storage key from browser and page events. Defaults to true.
pub fn listen_to_storage_changes(self, listen_to_storage_changes: bool) -> Self {
Self {
listen_to_storage_changes,
..self
}
}
/// Initial value to use when the storage key is not set. Note that this value is read once on creation of the storage hook and not updated again. Accepts a signal and defaults to `T::default()`.
pub fn initial_value(self, initial: impl Into<MaybeRwSignal<T>>) -> Self {
Self {
@ -395,12 +458,4 @@ impl<T: Default, C: StringCodec<T>> UseStorageOptions<T, C> {
..self
}
}
/// Debounce or throttle the writing to storage whenever the value changes.
pub fn filter(self, filter: impl Into<FilterOptions>) -> Self {
Self {
filter: filter.into(),
..self
}
}
}