htmx integration

static/packages/htmx/ext/morphdom-swap.js

@@ -0,0 +1,21 @@
+if (htmx.version && !htmx.version.startsWith("1.")) {
+    console.warn("WARNING: You are using an htmx 1 extension with htmx " + htmx.version +
+        ".  It is recommended that you move to the version of this extension found on https://htmx.org/extensions")
+}
+htmx.defineExtension('morphdom-swap', {
+    isInlineSwap: function(swapStyle) {
+        return swapStyle === 'morphdom';
+    },
+    handleSwap: function (swapStyle, target, fragment) {
+        if (swapStyle === 'morphdom') {
+            if (fragment.nodeType === Node.DOCUMENT_FRAGMENT_NODE) {
+                // IE11 doesn't support DocumentFragment.firstElementChild
+                morphdom(target, fragment.firstElementChild || fragment.firstChild);
+                return [target];
+            } else {
+                morphdom(target, fragment.outerHTML);
+                return [target];
+            }
+        }
+    }
+});