Implement confirmation modal

flaskbb/themes/aurora/src/app/confirm_modal.js

@@ -0,0 +1,38 @@
+import { Modal } from "bootstrap";
+
+var confirmModalElement = document.getElementById("confirmModal");
+if (confirmModalElement) {
+    // PS: Don't forget to use "type=button" for buttons:
+    // https://stackoverflow.com/a/3315016
+    // otherwise you gotta hijack the click event and add a preventDefault()
+
+    confirmModalElement.addEventListener("show.bs.modal", function(event) {
+        // Get the instance of this modal
+        let confirmModal = Modal.getInstance(confirmModalElement);
+
+        // Button that triggered the modal
+        let button = event.relatedTarget;
+
+        // form of the button that triggered this modal
+        let form = button.closest("form");
+
+        // the confirm button of the modal
+        let confirmButton = confirmModalElement.querySelector(".confirmBtn");
+        confirmButton.addEventListener(
+            "click",
+            function(e) {
+                e.preventDefault();
+                if (form.checkValidity()) {
+                    form.submit();
+                    confirmModal.hide();
+                } else {
+                    confirmModal.hide();
+                    form.reportValidity();
+                }
+            },
+            {
+                once: true,
+            }
+        );
+    });
+}