sync form work

lib/ui/popup.html

@@ -14,9 +14,15 @@
 
         document.querySelector('#button-popup').addEventListener('click', () => {
             const popup = ui.createPopup('title', 'content',
-                { text: 'Ok', trigger: () => true });
-            document.body.appendChild(popup);
-            setTimeout(() => popup.style.opacity = 1);
+                {
+                    text: 'Loading', trigger: p => {
+                        p.loading = true;
+                        setTimeout(() => p.loading = false, 1000);
+                        return false;
+                    }
+                },
+                { text: 'OK' });
+            popup.show();
         });
     </script>
     <style type="text/css">