Basic element.focus and blur methods

Fixes #5462.

components/script/dom/htmlelement.rs

@@ -10,21 +10,21 @@ use dom::bindings::codegen::Bindings::HTMLElementBinding::HTMLElementMethods;
 use dom::bindings::codegen::Bindings::HTMLInputElementBinding::HTMLInputElementMethods;
 use dom::bindings::codegen::Bindings::WindowBinding::WindowMethods;
 use dom::bindings::codegen::InheritTypes::{ElementCast, HTMLFrameSetElementDerived};
-use dom::bindings::codegen::InheritTypes::{EventTargetCast, HTMLInputElementCast};
+use dom::bindings::codegen::InheritTypes::{EventTargetCast, HTMLInputElementCast, NodeCast};
 use dom::bindings::codegen::InheritTypes::{HTMLElementDerived, HTMLBodyElementDerived};
 use dom::bindings::js::{JSRef, Temporary, MutNullableJS};
 use dom::bindings::error::ErrorResult;
 use dom::bindings::error::Error::Syntax;
 use dom::bindings::utils::Reflectable;
 use dom::cssstyledeclaration::{CSSStyleDeclaration, CSSModificationAccess};
-use dom::document::Document;
+use dom::document::{Document, DocumentHelpers};
 use dom::domstringmap::DOMStringMap;
 use dom::element::{Element, ElementTypeId, ActivationElementHelpers, AttributeHandlers};
 use dom::eventtarget::{EventTarget, EventTargetHelpers, EventTargetTypeId};
 use dom::htmlinputelement::HTMLInputElement;
 use dom::htmlmediaelement::HTMLMediaElementTypeId;
 use dom::htmltablecellelement::HTMLTableCellElementTypeId;
-use dom::node::{Node, NodeTypeId, window_from_node};
+use dom::node::{Node, NodeHelpers, NodeTypeId, document_from_node, window_from_node};
 use dom::virtualmethods::VirtualMethods;
 use dom::window::WindowHelpers;
 
@@ -135,6 +135,32 @@ impl<'a> HTMLElementMethods for JSRef<'a, HTMLElement> {
         // https://www.w3.org/Bugs/Public/show_bug.cgi?id=27430 ?
         element.as_maybe_activatable().map(|a| a.synthetic_click_activation(false, false, false, false));
     }
+
+    // https://html.spec.whatwg.org/multipage/interaction.html#dom-focus
+    fn Focus(self) {
+        // TODO: Mark the element as locked for focus and run the focusing steps.
+        // https://html.spec.whatwg.org/multipage/interaction.html#focusing-steps
+        let element: JSRef<Element> = ElementCast::from_ref(self);
+        let document = document_from_node(self).root();
+        let document = document.r();
+        document.begin_focus_transaction();
+        document.request_focus(element);
+        document.commit_focus_transaction();
+    }
+
+    // https://html.spec.whatwg.org/multipage/interaction.html#dom-blur
+    fn Blur(self) {
+        // TODO: Run the unfocusing steps.
+        let node: JSRef<Node> = NodeCast::from_ref(self);
+        if !node.get_focus_state() {
+            return;
+        }
+        // https://html.spec.whatwg.org/multipage/interaction.html#unfocusing-steps
+        let document = document_from_node(self).root();
+        document.r().begin_focus_transaction();
+        // If `request_focus` is not called, focus will be set to None.
+        document.r().commit_focus_transaction();
+    }
 }
 
 // https://html.spec.whatwg.org/#attr-data-*

components/script/dom/webidls/HTMLElement.webidl

@@ -25,8 +25,8 @@ interface HTMLElement : Element {
            attribute boolean hidden;
   void click();
   //         attribute long tabIndex;
-  //void focus();
-  //void blur();
+  void focus();
+  void blur();
   //         attribute DOMString accessKey;
   //readonly attribute DOMString accessKeyLabel;
   //         attribute boolean draggable;

tests/content/test_document_activeElement.html

@@ -10,10 +10,9 @@
             is_not(document.activeElement, null, "test_1.1, document.activeElement");
             is(document.activeElement, document.body, "test_1.2, document.activeElement");
 
-            //TODO: uncomment following lines when focus() method will be available
-            //document.getElementById('foo').focus();
+            document.getElementById('foo').focus();
             is_not(document.activeElement, null, "test_2.1, document.activeElement");
-            //is(document.activeElement, document.getElementById("foo"), "test_2.2, document.activeElement");
+            is(document.activeElement, document.getElementById("foo"), "test_2.2, document.activeElement");
         </script>
     </body>
 </html>

tests/content/test_focus_blur.html

@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <meta charset="UTF-8">
+  <script src="harness.js"></script>
+</head>
+<body>
+  <input id="a">
+  <input id="b">
+  <script>
+    var a = document.getElementById("a");
+    var b = document.getElementById("b");
+
+    is(document.activeElement, document.body);
+    a.focus();
+    is(document.activeElement, a);
+    b.focus();
+    is(document.activeElement, b);
+    a.blur();
+    is(document.activeElement, b);
+    b.blur();
+    is(document.activeElement, document.body);
+  </script>
+</body>
+</html>

tests/wpt/metadata/html/semantics/disabled-elements/disabledElement.html.ini

@@ -20,10 +20,3 @@
 
   [A disabled <input[type=radio\]> should not be focusable]
     expected: FAIL
-
-  [A disabled <a> should be focusable]
-    expected: FAIL
-
-  [A disabled <span> should be focusable]
-    expected: FAIL
-