Function ShowLet 

pub fn ShowLet<T, ChFn, V, M, __ImplTrait0>(
    props: ShowLetProps<T, ChFn, V, M, __ImplTrait0>,
) -> impl IntoView
where
    __ImplTrait0: IntoOptionGetter<T, M>,
    ChFn: Fn(T) -> V + Send + Clone + 'static,
    V: IntoView + 'static,
    T: 'static,

Like <Show> but for Option. This is a shortcut for

value.map(|value| {
    view! { ... }
})

If you specify a fallback it is equvalent to

value
    .map(
        |value| children(value),
    )
    .unwrap_or_else(fallback)

Example

let (opt_value, set_opt_value) = signal(None::<i32>);

view! {
    <ShowLet some=opt_value let:value>
        "We have a value: " {value}
    </ShowLet>
}

You can also specify a fallback:

let (opt_value, set_opt_value) = signal(None::<i32>);

view! {
    <ShowLet some=opt_value let:value fallback=|| "Got nothing">
        "We have a value: " {value}
    </ShowLet>
}

In addition to signals you can also use a closure that returns an Option:

let (opt_value, set_opt_value) = signal(None::<i32>);

view! {
    <ShowLet some=move || opt_value.get().map(|v| v * 2) let:value>
        "We have a value: " {value}
    </ShowLet>
}

Required Props

• children: [ChFn]

  • The children will be shown whenever value is Some.

    They take the inner value as an argument. Use let: to bind the value to a variable.

• some: [__ImplTrait0]
  • A signal of type Option or a closure that returns an Option. If the value is Some, the children will be shown. Otherwise the fallback will be shown, if present.

Optional Props

• fallback: impl Into<ViewFn>

  • A closure that returns what gets rendered when the value is None. By default this is the empty view.

    You can think of it as the closure inside .unwrap_or_else(|| fallback()).

• _marker: PhantomData<(T, M)>
  • Marker for generic parameters. Ignore this.