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Add an api for retrieving the id of the element

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This commit is contained in:
Jeremy Wall 2023-11-12 18:28:21 -05:00
parent e71a28b4e3
commit 2f7c3793c5
2 changed files with 18 additions and 8 deletions
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20
macros/src/lib.rs
View File

@ -285,21 +285,29 @@ fn expand_template_struct(item_struct: ItemStruct) -> TokenStream {
);
let trait_path = expand_crate_ref("wasm-web-component", parse_quote!(TemplateElement));
let expanded = quote! {
use std::sync::Once;
use std::sync::OnceLock;
use web_sys::Node;
static #struct_once_name: Once = Once::new();
static #struct_once_name: OnceLock<Option<String>> = OnceLock::new();
#item_struct
impl #trait_path for #struct_name {}
impl #struct_name {
#[doc = "Defines this HtmlTemplateElement and adds it to the document exactly once. Subsequent calls are noops."]
pub fn define_once() { // TODO(jwall): Should this return the element?
#struct_once_name.call_once(|| {
#[doc = "Defines this HtmlTemplateElement and adds it to the document exactly once. Subsequent calls are noops. Returns the the template element id it exists on the template element."]
pub fn define_once() -> Option<&'static Option<String>> {
#struct_once_name.get_or_init(|| {
let template_element = Self::render();
let id: Option<String> = template_element.get_attribute("id");
let body = web_sys::window().expect("Failed to get window")
.document().expect("Failed to get window document").
body().expect("Failed to get document body");
body.append_child(template_element.as_ref()).expect("Failed to add template element to document");
})
return id;
});
return #struct_once_name.get();
}
#[doc = "Returns the the template element id it exists. None if the element has not been defined yet. Some(&None) if the element has no id. Some(&Some(id)) if the element has an id."]
pub fn get_id() -> Option<&'static Option<String>> {
return #struct_once_name.get();
}
}
};

6
wasm-web-component/src/lib.rs
View File

@ -334,13 +334,15 @@ mod tests {
.unwrap()
.into();
let el: HtmlTemplateElement = val.into();
el
el.set_attribute("id", "template-id").unwrap();
return el;
}
}
let body = window().unwrap().document().unwrap().body().unwrap();
assert!(!body.last_child().unwrap().has_type::<HtmlTemplateElement>());
MyTemplate::define_once();
let id = MyTemplate::define_once();
assert_eq!(id.unwrap(), &Some(String::from("template-id")));
assert!(body.last_child().unwrap().has_type::<HtmlTemplateElement>());
}
}