Update app.js

Added fix for nested modals closing parent modals

js/app.js

@@ -401,3 +401,33 @@ $(document).ready(function() {
     // Data Tables
     new DataTable('.dataTables');
 });
+
+/*
+ |---------------------------------------------------------------
+ | Nested Modal Fix for Bootstrap/AdminLTE
+ | Prevents parent modals from closing when a child modal closes
+ |---------------------------------------------------------------
+*/
+$(document).on('show.bs.modal', '.modal', function () {
+    // How many modals are currently visible?
+    const visibleModals = $('.modal:visible').length;
+
+    // Increase z-index for each new modal
+    const zIndex = 1040 + (10 * visibleModals);
+    $(this).css('z-index', zIndex);
+
+    // Delay required because Bootstrap inserts backdrop asynchronously
+    setTimeout(() => {
+        $('.modal-backdrop').not('.modal-stack')
+            .css('z-index', zIndex - 1)
+            .addClass('modal-stack'); // mark backdrops so they aren't reset
+    }, 0);
+});
+
+// Restore modal-open class when closing a child modal
+$(document).on('hidden.bs.modal', '.modal', function () {
+    if ($('.modal:visible').length > 0) {
+        // Ensure background scroll remains locked
+        $('body').addClass('modal-open');
+    }
+});