Bug 940698 - Add an "ownerNumberControl" property to HTMLInputElement. r=smaug

content/html/content/src/HTMLInputElement.cpp

@@ -2244,6 +2244,21 @@ HTMLInputElement::MozIsTextField(bool aExcludePassword)
   return IsSingleLineTextControl(aExcludePassword);
 }
 
+HTMLInputElement*
+HTMLInputElement::GetOwnerNumberControl()
+{
+  if (IsInNativeAnonymousSubtree() &&
+      mType == NS_FORM_INPUT_TEXT &&
+      GetParent() && GetParent()->GetParent()) {
+    HTMLInputElement* grandparent =
+      HTMLInputElement::FromContentOrNull(GetParent()->GetParent());
+    if (grandparent && grandparent->mType == NS_FORM_INPUT_NUMBER) {
+      return grandparent;
+    }
+  }
+  return nullptr;
+}
+
 NS_IMETHODIMP
 HTMLInputElement::MozIsTextField(bool aExcludePassword, bool* aResult)
 {

content/html/content/src/HTMLInputElement.h

@@ -668,6 +668,8 @@ public:
 
   void MozSetFileNameArray(const Sequence< nsString >& aFileNames);
 
+  HTMLInputElement* GetOwnerNumberControl();
+
   bool MozIsTextField(bool aExcludePassword);
 
   nsIEditor* GetEditor();

dom/webidl/HTMLInputElement.webidl

@@ -154,6 +154,18 @@ partial interface HTMLInputElement {
   [ChromeOnly]
   void mozSetFileNameArray(sequence<DOMString> fileNames);
 
+  // Number controls (<input type=number>) have an anonymous text control
+  // (<input type=text>) in the anonymous shadow tree that they contain. On
+  // such an anonymous text control this property provides access to the
+  // number control that owns the text control. This is useful, for example,
+  // in code that looks at the currently focused element to make decisions
+  // about which IME to bring up. Such code needs to be able to check for any
+  // owning number control since it probably wants to bring up a number pad
+  // instead of the standard keyboard, even when the anonymous text control has
+  // focus.
+  [ChromeOnly]
+  readonly attribute HTMLInputElement? ownerNumberControl;
+
   boolean mozIsTextField(boolean aExcludePassword);
 };