What is the best way to require one of two attributes

[phill-85]

My component has a requirement that the aria-label attribute should be set if the title attribute is not set.

I don't see a way with the #[prop_or_......] macros.

[futursolo]

This is a limitation of the Rust typing system that you cannot have Union types as you would in TypeScript.

In Rust, if you want a user to choose only 1 variant, you need to use an enum.

#[derive(PartialEq, Clone)]
enum TitleKind {
    #[default]
    Title,
    AriaLabel,
}

#[derive(Properties, PartialEq, Clone)]
pub struct CompProps {
    title: AttrValue,
    #[prop_or_default]
    title_kind: TitleKind,
}

// Defaults to title.
html! { <Comp title={title} /> };
// Sets the title kind to aria label.
html! { <Comp title={title} title_kind={TitleKind::AriaLabel} /> };

[phill-85]

Thanks, I was thinking enum, but it's not ideal.