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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
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@ -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 trait_path = expand_crate_ref("wasm-web-component", parse_quote!(TemplateElement));
let expanded = quote! { let expanded = quote! {
use std::sync::Once; use std::sync::OnceLock;
use web_sys::Node; use web_sys::Node;
static #struct_once_name: Once = Once::new(); static #struct_once_name: OnceLock<Option<String>> = OnceLock::new();
#item_struct #item_struct
impl #trait_path for #struct_name {} impl #trait_path for #struct_name {}
impl #struct_name { impl #struct_name {
#[doc = "Defines this HtmlTemplateElement and adds it to the document exactly once. Subsequent calls are noops."] #[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() { // TODO(jwall): Should this return the element? pub fn define_once() -> Option<&'static Option<String>> {
#struct_once_name.call_once(|| { #struct_once_name.get_or_init(|| {
let template_element = Self::render(); let template_element = Self::render();
let id: Option<String> = template_element.get_attribute("id");
let body = web_sys::window().expect("Failed to get window") let body = web_sys::window().expect("Failed to get window")
.document().expect("Failed to get window document"). .document().expect("Failed to get window document").
body().expect("Failed to get document body"); body().expect("Failed to get document body");
body.append_child(template_element.as_ref()).expect("Failed to add template element to document"); 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
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@ -334,13 +334,15 @@ mod tests {
.unwrap() .unwrap()
.into(); .into();
let el: HtmlTemplateElement = val.into(); let el: HtmlTemplateElement = val.into();
el el.set_attribute("id", "template-id").unwrap();
return el;
} }
} }
let body = window().unwrap().document().unwrap().body().unwrap(); let body = window().unwrap().document().unwrap().body().unwrap();
assert!(!body.last_child().unwrap().has_type::<HtmlTemplateElement>()); 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>()); assert!(body.last_child().unwrap().has_type::<HtmlTemplateElement>());
} }
} }