✨ svg support

nullstack · Mortaro · Oct 9, 2025 · Sep 1, 2025 · Oct 6, 2025 · Oct 9, 2025
commit 73df30ccd507347b65b9e46a1dd39ee6cb7c728d
diff --git a/client/render.js b/client/render.js
@@ -5,7 +5,7 @@ import { anchorableElement } from './anchorableNode'
 import { generateCallback, generateSubject } from './events'
 import { ref } from './ref'
 
-export default function render(node, options) {
+export default function render(node, isSvg = false) {
   if (isFalse(node) || node.type === 'head') {
     node.element = document.createComment('')
     return node.element
@@ -16,9 +16,8 @@ export default function render(node, options) {
     return node.element
   }
 
-  const svg = (options && options.svg) || node.type === 'svg'
-
-  if (svg) {
+  isSvg = isSvg || node.type === 'svg'
+  if (isSvg) {
     node.element = document.createElementNS('http://www.w3.org/2000/svg', node.type)
   } else {
     node.element = document.createElement(node.type)
@@ -58,7 +57,7 @@ export default function render(node, options) {
 
   if (!node.attributes.html) {
     for (let i = 0; i < node.children.length; i++) {
-      const child = render(node.children[i], { svg })
+      const child = render(node.children[i], isSvg)
       node.element.appendChild(child)
     }
 

diff --git a/client/rerender.js b/client/rerender.js
@@ -100,16 +100,18 @@ function updateHeadChildren(currentChildren, nextChildren) {
   }
 }
 
-function _rerender(current, next) {
+function _rerender(current, next, isParentSvg = false) {
   const selector = current.element
   next.element = current.element
 
   if (isFalse(current) && isFalse(next)) {
     return
   }
 
+  const isSvg = isParentSvg || next.type === 'svg'
+
   if (current.type !== next.type) {
-    const nextSelector = render(next)
+    const nextSelector = render(next, isSvg)
     selector.replaceWith(nextSelector)
     return
   }
@@ -132,22 +134,22 @@ function _rerender(current, next) {
     const limit = Math.max(current.children.length, next.children.length)
     if (next.children.length > current.children.length) {
       for (let i = 0; i < current.children.length; i++) {
-        _rerender(current.children[i], next.children[i])
+        _rerender(current.children[i], next.children[i], isSvg)
       }
       for (let i = current.children.length; i < next.children.length; i++) {
-        const nextSelector = render(next.children[i])
+        const nextSelector = render(next.children[i], isSvg)
         selector.appendChild(nextSelector)
       }
     } else if (current.children.length > next.children.length) {
       for (let i = 0; i < next.children.length; i++) {
-        _rerender(current.children[i], next.children[i])
+        _rerender(current.children[i], next.children[i], isSvg)
       }
       for (let i = current.children.length - 1; i >= next.children.length; i--) {
         selector.childNodes[i].remove()
       }
     } else {
       for (let i = limit - 1; i > -1; i--) {
-        _rerender(current.children[i], next.children[i])
+        _rerender(current.children[i], next.children[i], isSvg)
       }
     }
   }

diff --git a/shared/nodes.js b/shared/nodes.js
@@ -18,5 +18,5 @@ export function isFunction(node) {
 }
 
 export function isText(node) {
-  return node.type === 'text'
+  return node.type === 'text' && node.attributes === undefined
 }
diff --git a/tests/src/Application.njs b/tests/src/Application.njs
@@ -63,6 +63,7 @@ import LazyComponentLoader from './LazyComponentLoader'
 import NestedFolder from './nested/NestedFolder'
 import ChildComponentWithoutServerFunctions from './ChildComponentWithoutServerFunctions'
 import ObjectEventScope from './ObjectEventScope'
+import SvgSupport from './SvgSupport.njs'
 import './Application.css'
 
 class Application extends Nullstack {
@@ -156,6 +157,7 @@ class Application extends Nullstack {
         <LazyComponent route="/lazy-importer" prop="works" />
         <ChildComponentWithoutServerFunctions route="/child-component-without-server-functions" />
         <ObjectEventScope route="/object-event-scope" />
+        <SvgSupport route="/svg-support" />
         <ErrorPage route="*" />
       </body>
     )

diff --git a/tests/src/SvgSupport.njs b/tests/src/SvgSupport.njs
@@ -0,0 +1,46 @@
+import Nullstack from 'nullstack';
+
+function Close({ size }) {
+  return (
+    <svg width={size} height={size} viewBox="0 0 482 482">
+      <path d="M124 124L358 358" stroke="#000" stroke-width="70.2055" stroke-linecap="round" stroke-linejoin="round" />
+      <path d="M358 124L124 358" stroke="#000" stroke-width="70.2055" stroke-linecap="round" stroke-linejoin="round" />
+    </svg>
+  )
+}
+
+function Hamburger({ size }) {
+  return (
+    <svg width={size} height={size} viewBox="0 0 482 482">
+      <path d="M92.5 150H386.5" stroke="#000" stroke-width="42" stroke-linecap="round" stroke-linejoin="round" />
+      <path d="M92.5 241H386.5" stroke="#000" stroke-width="42" stroke-linecap="round" stroke-linejoin="round" />
+      <path d="M92.5 332H386.5" stroke="#000" stroke-width="42" stroke-linecap="round" stroke-linejoin="round" />
+    </svg>
+  )
+}
+
+class SvgSupport extends Nullstack {
+
+  open = false
+  visible = false
+
+  render() {
+    return (
+      <div>
+        <svg viewBox="0 0 240 80" xmlns="http://www.w3.org/2000/svg">
+          <text x="20" y="35" class="small">I</text>
+          <text x="40" y="35" class="heavy">love</text>
+          <text x="55" y="55" class="small">my</text>
+          <text x="60" y="55" class="tiny">cat!</text>
+        </svg>
+        {this.open ? <Close size={30} /> : <Hamburger size={30} />}
+        <button onclick={{open: !this.open}}> toggle </button>
+        {this.visible && <Hamburger size={69} />}
+        <button onclick={{visible: !this.visible}}> show </button>
+      </div>
+    )
+  }
+
+}
+
+export default SvgSupport;
diff --git a/tests/src/SvgSupport.test.js b/tests/src/SvgSupport.test.js
@@ -0,0 +1,22 @@
+describe('SvgSupport', () => {
+  beforeEach(async () => {
+    await page.goto('http://localhost:6969/svg-support')
+    await page.waitForSelector('[data-hydrated]')
+  })
+
+  test('svg can render text', async () => {
+    expect(true).toBeTruthy()
+  })
+
+  test('svg can add new paths while rerendering', async () => {
+    expect(true).toBeTruthy()
+  })
+
+  test('svg can render in short circuit statements', async () => {
+    expect(true).toBeTruthy()
+  })
+
+  test('svg can render in ternary statements', async () => {
+    expect(true).toBeTruthy()
+  })
+})