implemented NamedGetter and other suggestions

components/script/dom/htmlformelement.rs

@@ -65,6 +65,8 @@ use style::attr::AttrValue;
 use style::str::split_html_space_chars;
 
 use crate::dom::bindings::codegen::UnionTypes::RadioNodeListOrElement;
+use crate::dom::radionodelist::RadioNodeList;
+use std::collections::HashMap;
 
 #[derive(Clone, Copy, JSTraceable, MallocSizeOf, PartialEq)]
 pub struct GenerationId(u32);
@@ -78,6 +80,7 @@ pub struct HTMLFormElement {
     elements: DomOnceCell<HTMLFormControlsCollection>,
     generation_id: Cell<GenerationId>,
     controls: DomRefCell<Vec<Dom<Element>>>,
+    past_names_map: DomRefCell<HashMap<DOMString, Dom<HTMLElement>>>,
 }
 
 impl HTMLFormElement {
@@ -93,6 +96,7 @@ impl HTMLFormElement {
             elements: Default::default(),
             generation_id: Cell::new(GenerationId(0)),
             controls: DomRefCell::new(Vec::new()),
+            past_names_map: DomRefCell::new(HashMap::new()),
         }
     }
 
@@ -258,8 +262,83 @@ impl HTMLFormElementMethods for HTMLFormElement {
 
     // https://html.spec.whatwg.org/multipage/#the-form-element%3Adetermine-the-value-of-a-named-property
     fn NamedGetter(&self, name: DOMString) -> Option<RadioNodeListOrElement> {
-        // return Option::Some::<RadioNodeListOrElement>;
-        unimplemented!();
+        // unimplemented!();
+        let window = window_from_node(self);
+
+        // Q2. ERROR in the following declaration - check the attached screenshot (image2)
+        let mut candidates: Vec<Dom<HTMLElement>> = Vec::new();
+
+        // let mut candidates: RadioNodeList = RadioNodeList::new(&window, Dom<HTMLElement>);
+
+        let controls = self.controls.borrow();
+
+        for child in controls.iter() {
+            if child
+                .downcast::<HTMLElement>()
+                .map_or(false, |c| c.is_listed_element())
+            {
+                if child.has_attribute(&local_name!("id")) ||
+                    (child.has_attribute(&local_name!("name")) &&
+                        child.get_string_attribute(&local_name!("name")) == name)
+                {
+                    // println!("{:?}", child.what_is_this());
+                    candidates.push(Dom::from_ref(&*child.downcast::<HTMLElement>().unwrap()));
+                }
+            }
+        }
+
+        if candidates.len() == 0 {
+            for child in controls.iter() {
+                if child.is::<HTMLImageElement>() {
+                    if child.has_attribute(&local_name!("id")) ||
+                        (child.has_attribute(&local_name!("name")) &&
+                            child.get_string_attribute(&local_name!("name")) == name)
+                    {
+                        candidates.push(Dom::from_ref(&*child.downcast::<HTMLElement>().unwrap()));
+                    }
+                }
+            }
+        }
+
+        let mut past_names_map = self.past_names_map.borrow_mut();
+
+        if candidates.len() == 0 {
+            for (key, val) in past_names_map.iter() {
+                if *key == name {
+                    // println!("{:?}", val.what_is_this());
+                    return Some(RadioNodeListOrElement::Element(DomRoot::from_ref(
+                        &*val.upcast::<Element>(),
+                    )));
+                }
+            }
+        }
+
+        if candidates.len() > 1 {
+            let mut candidatesDomRoot: Vec<DomRoot<Node>> = Vec::new();
+            for cand in candidates.iter() {
+                // println!("{:?}", cand.what_is_this());
+                candidatesDomRoot.push(DomRoot::from_ref(&*cand.upcast::<Node>()));
+            }
+
+            // Q1. ERROR in the following line - check the attached screenshot (image1)
+            // Related link for potential fix: https://stackoverflow.com/a/26953620/11978763
+            // we are unsure of how to incorporate this
+            return Some(RadioNodeListOrElement::RadioNodeList(
+                RadioNodeList::new_simple_list(&window, candidatesDomRoot.iter()),
+            ));
+        }
+
+        let element_node = &candidates[0];
+        if past_names_map.contains_key(&name) {
+            let stat = past_names_map.entry(name).or_insert(element_node.clone());
+            *stat = element_node.clone();
+        } else {
+            past_names_map.insert(name, element_node.clone());
+        }
+
+        return Some(RadioNodeListOrElement::Element(DomRoot::from_ref(
+            &*element_node.upcast::<Element>(),
+        )));
     }
 
     // https://html.spec.whatwg.org/multipage/#the-form-element:supported-property-names
@@ -285,7 +364,10 @@ impl HTMLFormElementMethods for HTMLFormElement {
         // controls - list of form elements
         // check all listed elements first, push to sourcedNamesVec as per spec
         for child in controls.iter() {
-            if child.downcast::<HTMLElement>().map_or(false, |c| c.is_listed_element()) {
+            if child
+                .downcast::<HTMLElement>()
+                .map_or(false, |c| c.is_listed_element())
+            {
                 // if child.is_listed()
 
                 if child.has_attribute(&local_name!("id")) {