Namespace support for VRaw. (#3640)

* WIP.

* fmt.

* Fix parameter order.

* Cleanup.

* Change the docs.

* WIP test.

* fmt.

* Cast node to element.

* Fix test.

* Fix html in test.

* Typo.

packages/yew/src/dom_bundle/braw.rs

@@ -3,6 +3,7 @@ use web_sys::{Element, Node};
 
 use super::{BNode, BSubtree, DomSlot, Reconcilable, ReconcileTarget};
 use crate::html::AnyScope;
+use crate::virtual_dom::vtag::{MATHML_NAMESPACE, SVG_NAMESPACE};
 use crate::virtual_dom::VRaw;
 use crate::AttrValue;
 
@@ -14,8 +15,10 @@ pub struct BRaw {
 }
 
 impl BRaw {
-    fn create_elements(html: &str) -> Vec<Node> {
-        let div = gloo::utils::document().create_element("div").unwrap();
+    fn create_elements(html: &str, parent_namespace: Option<&str>) -> Vec<Node> {
+        let div = gloo::utils::document()
+            .create_element_ns(parent_namespace, "div")
+            .unwrap();
         div.set_inner_html(html);
         let children = div.child_nodes();
         let children = js_sys::Array::from(&children);
@@ -71,7 +74,21 @@ impl Reconcilable for VRaw {
         parent: &Element,
         slot: DomSlot,
     ) -> (DomSlot, Self::Bundle) {
-        let elements = BRaw::create_elements(&self.html);
+        let namespace = if parent
+            .namespace_uri()
+            .map_or(false, |ns| ns == SVG_NAMESPACE)
+        {
+            Some(SVG_NAMESPACE)
+        } else if parent
+            .namespace_uri()
+            .map_or(false, |ns| ns == MATHML_NAMESPACE)
+        {
+            Some(MATHML_NAMESPACE)
+        } else {
+            None
+        };
+
+        let elements = BRaw::create_elements(&self.html, namespace);
         let count = elements.len();
         let mut iter = elements.into_iter();
         let reference = iter.next();
@@ -160,7 +177,9 @@ mod tests {
     use wasm_bindgen_test::{wasm_bindgen_test as test, wasm_bindgen_test_configure};
 
     use super::*;
-    use crate::dom_bundle::utils::{setup_parent, setup_parent_and_sibling, SIBLING_CONTENT};
+    use crate::dom_bundle::utils::{
+        setup_parent, setup_parent_and_sibling, setup_parent_svg, SIBLING_CONTENT,
+    };
     use crate::virtual_dom::VNode;
 
     wasm_bindgen_test_configure!(run_in_browser);
@@ -173,7 +192,26 @@ mod tests {
         let elem = VNode::from_html_unchecked(HTML.into());
         let (_, mut elem) = elem.attach(&root, &scope, &parent, DomSlot::at_end());
         assert_braw(&mut elem);
-        assert_eq!(parent.inner_html(), HTML)
+        assert_eq!(parent.inner_html(), HTML);
+    }
+
+    #[test]
+    fn braw_works_svg() {
+        let (root, scope, parent) = setup_parent_svg();
+
+        const HTML: &str = r#"<circle cx="50" cy="50" r="40"></circle>"#;
+        let elem = VNode::from_html_unchecked(HTML.into());
+        let (_, mut elem) = elem.attach(&root, &scope, &parent, DomSlot::at_end());
+        assert_braw(&mut elem);
+        assert_eq!(parent.inner_html(), HTML);
+        assert_eq!(
+            parent
+                .first_child()
+                .unwrap()
+                .unchecked_into::<Element>()
+                .namespace_uri(),
+            Some(SVG_NAMESPACE.to_owned())
+        );
     }
 
     #[test]

packages/yew/src/dom_bundle/utils.rs

@@ -64,6 +64,7 @@ mod tests {
 
     use crate::dom_bundle::{BSubtree, DomSlot};
     use crate::html::AnyScope;
+    use crate::virtual_dom::vtag::SVG_NAMESPACE;
 
     pub fn setup_parent() -> (BSubtree, AnyScope, Element) {
         let scope = AnyScope::test();
@@ -75,6 +76,18 @@ mod tests {
         (root, scope, parent)
     }
 
+    pub fn setup_parent_svg() -> (BSubtree, AnyScope, Element) {
+        let scope = AnyScope::test();
+        let parent = document()
+            .create_element_ns(Some(SVG_NAMESPACE), "svg")
+            .unwrap();
+        let root = BSubtree::create_root(&parent);
+
+        document().body().unwrap().append_child(&parent).unwrap();
+
+        (root, scope, parent)
+    }
+
     pub const SIBLING_CONTENT: &str = "END";
 
     pub(crate) fn setup_parent_and_sibling() -> (BSubtree, AnyScope, Element, DomSlot) {

packages/yew/src/virtual_dom/vnode.rs

@@ -76,8 +76,8 @@ impl VNode {
     ///
     /// # Behavior in browser
     ///
-    /// In the browser, this function creates an element, sets the passed HTML to its `innerHTML`
-    /// and inserts the contents of it into the DOM.
+    /// In the browser, this function creates an element with the same XML namespace as the parent,
+    /// sets the passed HTML to its `innerHTML` and inserts the contents of it into the DOM.
     ///
     /// # Behavior on server
     ///