leptos-rs/leptos v.0.4.7

v0.4.7

on GitHub

This is mostly a bug-fix release with a few small features. There will probably be one or two more patch releases before 0.5.0.

New Features

mut in component props

This didn't work before; now it does:

#[component]
fn TestMutCallback<'a, F>(
    cx: Scope,
    mut callback: F,
    value: &'a str,
) -> impl IntoView
where
    F: FnMut(u32) + 'static,
{

MaybeProp type

MaybeProp is essentially a wrapper for Option<MaybeSignal<Option<T>>> with a nicer API. This is useful for something like a component library, where you want to give a user the maximum flexibility in the types they give to props while still checking that they're the appropriate T.

This allows you to define optional props that

1. may or may not be provided
2. if provided, may be a plain value or a signal
3. if a signal type, may or may not have a value (i.e., are a Signal<Option<T>>)

Implementing From<_> for a plain Signal<T> type here is possible, but depends on the changes in 0.5.0, so I'll add it for that release.

#[component]
pub fn App(cx: Scope) -> impl IntoView {
    let (count, set_count) = create_signal(cx, 5);

    view! { cx,
        <TakesMaybeProp/>
        <TakesMaybeProp maybe=42/>
        <TakesMaybeProp maybe=Signal::derive(cx, move || Some(count.get()))/>
    }
}

#[component]
pub fn TakesMaybeProp(cx: Scope, #[prop(optional, into)] maybe: MaybeProp<i32>) -> impl IntoView {
    // .get() gives you `Option<T>`, replacing `self.as_ref().and_then(|n| n.get())`
    let value: Option<i32> = maybe.get();
    // .with() takes a plain `&T`; returns `None` if the prop isn't present or the inner value is None
    let plus_one = maybe.with(|n: &i32| n + 1);

    view! { cx,
        <p>{maybe}</p>
    }
}

What's Changed

• (doc)expand spawn_local documentation by @Bechma in #1433
• fix(examples): unable to parse makefile (#1440) by @agilarity in #1441
• fix: incorrect opening node for <Each/> in debug mode (closes #1168) by @gbj in #1436
• docs: fix typo in 23_ssr_modes.md by @gbj in #1445
• feat: add MaybeProp type by @gbj in #1443
• perf(examples): speed up the test-info report (#1446) by @agilarity in #1447
• feat: allow mut in component props and suppress "needless lifetime" warning (closes #1458) by @gbj in #1459
• fix: AnimatedShow - possible panic on cleanup by @sebadob in #1464
• Document the magic number 128 as FILTER_SHOW_COMMENT. by @martinfrances107 in #1468
• Update README.md by @randommm in #1470
• fix: properly replace text nodes in DynChild (closes #1456) by @gbj in #1472
• fix: compile-time regression for deeply-nested component trees by @gbj in #1476
• fix: correctly escape HTML in DynChild text nodes by @gbj in #1478
• Minor: doclink to Error needed FQDN. by @martinfrances107 in #1469
• Fix typo in docs for ServerFnErrorErr by @DanikVitek in #1477
• fix: correctly export all DOM helpers by @gbj in #1486

New Contributors

• @Bechma made their first contribution in #1433
• @randommm made their first contribution in #1470
• @DanikVitek made their first contribution in #1477

Full Changelog: v0.4.6...v.0.4.7