Implementing document.hasFocus method. #6475

components/script/dom/document.rs

@@ -1183,6 +1183,27 @@ impl<'a> DocumentMethods for &'a Document {
         }
     }
 
+    // https://html.spec.whatwg.org/#dom-document-hasfocus
+    fn HasFocus(self) -> bool {
+        let target = self;                                                        // Step 1.
+        let window = self.window.root();
+        let window = window.r();
+        let browsing_context = window.browsing_context();
+        let browsing_context = browsing_context.as_ref();
+
+        match browsing_context {
+            Some(browsing_context) => {
+                let condidate = browsing_context.active_document();                        // Step 2.
+                if condidate.node.get_unique_id() == target.node.get_unique_id() {           // Step 3.
+                    true
+                } else {
+                    false //TODO  Step 4.
+                }
+            }
+            None => false
+        }
+    }
+
     // https://dom.spec.whatwg.org/#dom-document-documenturi
     fn DocumentURI(self) -> DOMString {
         self.URL()

components/script/dom/webidls/Document.webidl

@@ -114,7 +114,7 @@ partial /*sealed*/ interface Document {
   // user interaction
   readonly attribute Window/*Proxy?*/ defaultView;
   // readonly attribute Element? activeElement;
-  // boolean hasFocus();
+  boolean hasFocus();
   // attribute DOMString designMode;
   // boolean execCommand(DOMString commandId, optional boolean showUI = false, optional DOMString value = "");
   // boolean queryCommandEnabled(DOMString commandId);

tests/wpt/metadata/html/dom/interfaces.html.ini

@@ -30,9 +30,6 @@
   [Document interface: operation writeln(DOMString)]
     expected: FAIL
 
-  [Document interface: operation hasFocus()]
-    expected: FAIL
-
   [Document interface: attribute designMode]
     expected: FAIL
 
@@ -1098,9 +1095,6 @@
   [Document interface: calling writeln(DOMString) on document.implementation.createDocument(null, "", null) with too few arguments must throw TypeError]
     expected: FAIL
 
-  [Document interface: document.implementation.createDocument(null, "", null) must inherit property "hasFocus" with the proper type (61)]
-    expected: FAIL
-
   [Document interface: document.implementation.createDocument(null, "", null) must inherit property "designMode" with the proper type (62)]
     expected: FAIL