Implement `selectedIndex` IDL attribute on `HTMLOptionsCollection`.

1 files changed, 20 insertions, 0 deletions

diff --git a/components/script/dom/htmloptionscollection.rs b/components/script/dom/htmloptionscollection.rs
index 2e4ce0f9a37..4fea7a69ff6 100644
--- a/components/script/dom/htmloptionscollection.rs
+++ b/components/script/dom/htmloptionscollection.rs
@@ -6,6 +6,7 @@ use dom::bindings::codegen::Bindings::ElementBinding::ElementMethods;
 use dom::bindings::codegen::Bindings::HTMLCollectionBinding::HTMLCollectionMethods;
 use dom::bindings::codegen::Bindings::HTMLOptionsCollectionBinding;
 use dom::bindings::codegen::Bindings::HTMLOptionsCollectionBinding::HTMLOptionsCollectionMethods;
+use dom::bindings::codegen::Bindings::HTMLSelectElementBinding::HTMLSelectElementMethods;
 use dom::bindings::codegen::Bindings::NodeBinding::NodeBinding::NodeMethods;
 use dom::bindings::codegen::UnionTypes::{HTMLOptionElementOrHTMLOptGroupElement, HTMLElementOrLong};
 use dom::bindings::error::{Error, ErrorResult};
@@ -16,6 +17,7 @@ use dom::bindings::str::DOMString;
 use dom::element::Element;
 use dom::htmlcollection::{CollectionFilter, HTMLCollection};
 use dom::htmloptionelement::HTMLOptionElement;
+use dom::htmlselectelement::HTMLSelectElement;
 use dom::node::{document_from_node, Node};
 use dom::window::Window;
 
@@ -182,4 +184,22 @@ impl HTMLOptionsCollectionMethods for HTMLOptionsCollection {
             element.Remove();
         }
     }
+
+    // https://html.spec.whatwg.org/multipage/#dom-htmloptionscollection-selectedindex
+    fn SelectedIndex(&self) -> i32 {
+        self.upcast()
+            .root_node()
+            .downcast::<HTMLSelectElement>()
+            .expect("HTMLOptionsCollection not rooted on a HTMLSelectElement")
+            .SelectedIndex()
+    }
+
+    // https://html.spec.whatwg.org/multipage/#dom-htmloptionscollection-selectedindex
+    fn SetSelectedIndex(&self, index: i32) {
+        self.upcast()
+            .root_node()
+            .downcast::<HTMLSelectElement>()
+            .expect("HTMLOptionsCollection not rooted on a HTMLSelectElement")
+            .SetSelectedIndex(index)
+    }
 }