Implement initial pieces of form validation.

1 files changed, 33 insertions, 0 deletions

diff --git a/components/script/dom/element.rs b/components/script/dom/element.rs
index 25d9f0d45b8..cceb6cbf095 100644
--- a/components/script/dom/element.rs
+++ b/components/script/dom/element.rs
@@ -47,7 +47,9 @@ use dom::htmlimageelement::{HTMLImageElement, LayoutHTMLImageElementHelpers};
 use dom::htmlinputelement::{HTMLInputElement, LayoutHTMLInputElementHelpers};
 use dom::htmllabelelement::HTMLLabelElement;
 use dom::htmllegendelement::HTMLLegendElement;
+use dom::htmlobjectelement::HTMLObjectElement;
 use dom::htmloptgroupelement::HTMLOptGroupElement;
+use dom::htmlselectelement::HTMLSelectElement;
 use dom::htmltablecellelement::{HTMLTableCellElement, HTMLTableCellElementLayoutHelpers};
 use dom::htmltableelement::{HTMLTableElement, HTMLTableElementLayoutHelpers};
 use dom::htmltablerowelement::{HTMLTableRowElement, HTMLTableRowElementLayoutHelpers};
@@ -60,6 +62,7 @@ use dom::node::{NodeDamage, SEQUENTIALLY_FOCUSABLE, UnbindContext};
 use dom::node::{document_from_node, window_from_node};
 use dom::nodelist::NodeList;
 use dom::text::Text;
+use dom::validation::Validatable;
 use dom::virtualmethods::{VirtualMethods, vtable_for};
 use html5ever::serialize;
 use html5ever::serialize::SerializeOpts;
@@ -1913,6 +1916,36 @@ impl Element {
         })
     }
 
+    // https://html.spec.whatwg.org/multipage/#category-submit
+    pub fn as_maybe_validatable(&self) -> Option<&Validatable> {
+        let element = match self.upcast::<Node>().type_id() {
+            NodeTypeId::Element(ElementTypeId::HTMLElement(HTMLElementTypeId::HTMLInputElement)) => {
+                let element = self.downcast::<HTMLInputElement>().unwrap();
+                Some(element as &Validatable)
+            },
+            NodeTypeId::Element(ElementTypeId::HTMLElement(HTMLElementTypeId::HTMLButtonElement)) => {
+                let element = self.downcast::<HTMLButtonElement>().unwrap();
+                Some(element as &Validatable)
+            },
+            NodeTypeId::Element(ElementTypeId::HTMLElement(HTMLElementTypeId::HTMLObjectElement)) => {
+                let element = self.downcast::<HTMLObjectElement>().unwrap();
+                Some(element as &Validatable)
+            },
+            NodeTypeId::Element(ElementTypeId::HTMLElement(HTMLElementTypeId::HTMLSelectElement)) => {
+                let element = self.downcast::<HTMLSelectElement>().unwrap();
+                Some(element as &Validatable)
+            },
+            NodeTypeId::Element(ElementTypeId::HTMLElement(HTMLElementTypeId::HTMLTextAreaElement)) => {
+                let element = self.downcast::<HTMLTextAreaElement>().unwrap();
+                Some(element as &Validatable)
+            },
+            _ => {
+                None
+            }
+        };
+        element
+    }
+
     pub fn click_in_progress(&self) -> bool {
         self.upcast::<Node>().get_flag(CLICK_IN_PROGRESS)
     }