Start from envelope Django template

core/static/django-htmx.js

@@ -0,0 +1,22 @@
+{
+    const data = document.currentScript.dataset;
+    const isDebug = data.debug === "True";
+
+    if (isDebug) {
+        document.addEventListener("htmx:beforeOnLoad", function (event) {
+            const xhr = event.detail.xhr;
+            if (xhr.status == 500 || xhr.status == 404) {
+                // Tell htmx to stop processing this response
+                event.stopPropagation();
+
+                document.children[0].innerHTML = xhr.response;
+
+                // Run Django’s inline script
+                // (1, eval) wtf - see https://stackoverflow.com/questions/9107240/1-evalthis-vs-evalthis-in-javascript
+                (1, eval)(document.scripts[0].innerText);
+                // Need to directly call Django’s onload function since browser won’t
+                window.onload();
+            }
+        });
+    }
+}