From 731fb52ab4d12fd2976f79ceb8f79f9093155ac0 Mon Sep 17 00:00:00 2001
From: Alex Tselegidis <alextselegidis@gmail.com>
Date: Sat, 12 Dec 2020 14:22:25 +0200
Subject: [PATCH] Display confirmation modal when disabling a connected Google
 Calendar Sync (#955).

---
 .../language/arabic/translations_lang.php     |  3 +-
 .../language/bulgarian/translations_lang.php  |  1 +
 .../language/catalan/translations_lang.php    |  1 +
 .../language/chinese/translations_lang.php    |  1 +
 .../language/czech/translations_lang.php      |  1 +
 .../language/danish/translations_lang.php     |  1 +
 .../language/dutch/translations_lang.php      |  1 +
 .../language/english/translations_lang.php    |  1 +
 .../language/finnish/translations_lang.php    |  1 +
 .../language/french/translations_lang.php     |  1 +
 .../language/german/translations_lang.php     |  1 +
 .../language/greek/translations_lang.php      |  1 +
 .../language/hebrew/translations_lang.php     |  3 +-
 .../language/hindi/translations_lang.php      |  1 +
 .../language/hungarian/translations_lang.php  |  1 +
 .../language/italian/translations_lang.php    |  1 +
 .../language/japanese/translations_lang.php   |  1 +
 .../luxembourgish/translations_lang.php       |  1 +
 .../language/marathi/translations_lang.php    |  1 +
 .../language/polish/translations_lang.php     |  1 +
 .../portuguese-br/translations_lang.php       |  1 +
 .../language/portuguese/translations_lang.php |  1 +
 .../language/romanian/translations_lang.php   |  1 +
 .../language/russian/translations_lang.php    |  1 +
 .../language/slovak/translations_lang.php     |  1 +
 .../language/spanish/translations_lang.php    |  1 +
 .../language/swedish/translations_lang.php    |  1 +
 .../language/turkish/translations_lang.php    |  1 +
 assets/js/backend_calendar_default_view.js    |  1 -
 assets/js/backend_calendar_google_sync.js     | 56 ++++++++++++-------
 30 files changed, 67 insertions(+), 22 deletions(-)

diff --git a/application/language/arabic/translations_lang.php b/application/language/arabic/translations_lang.php
index b450c97e..83d713a3 100755
--- a/application/language/arabic/translations_lang.php
+++ b/application/language/arabic/translations_lang.php
@@ -1,4 +1,4 @@
-<?php
+<?php defined('BASEPATH') OR exit('No direct script access allowed');
 // Arabic
 $lang['page_title'] = 'احجز موعد مع';
 $lang['service_and_provider'] = 'اختر الخدمة والمزود';
@@ -60,6 +60,7 @@ $lang['log_out'] = 'تسجيل الخروج';
 $lang['synchronize'] = 'المزامنة';
 $lang['enable_sync'] = 'تمكين المزامنة';
 $lang['disable_sync'] = 'تعطيل المزامنة';
+$lang['disable_sync_prompt'] = 'Are you sure that you want to disable the calendar synchronization?';
 $lang['reload'] = 'اعادة التحميل';
 $lang['appointment'] = 'الموعد';
 $lang['unavailable'] = 'غير متوفر';
diff --git a/application/language/bulgarian/translations_lang.php b/application/language/bulgarian/translations_lang.php
index 494284f0..1b91a5e6 100755
--- a/application/language/bulgarian/translations_lang.php
+++ b/application/language/bulgarian/translations_lang.php
@@ -60,6 +60,7 @@ $lang['log_out'] = 'Изход';
 $lang['synchronize'] = 'синхронизиране';
 $lang['enable_sync'] = 'Активиране на синхронизиране';
 $lang['disable_sync'] = 'Изключване на синхронизиране';
+$lang['disable_sync_prompt'] = 'Are you sure that you want to disable the calendar synchronization?';
 $lang['reload'] = 'Презареждане';
 $lang['appointment'] = 'Час';
 $lang['unavailable'] = 'не е на лице';
diff --git a/application/language/catalan/translations_lang.php b/application/language/catalan/translations_lang.php
index d29ad4d3..2565525c 100644
--- a/application/language/catalan/translations_lang.php
+++ b/application/language/catalan/translations_lang.php
@@ -62,6 +62,7 @@ $lang['log_out'] = 'Sortida';
 $lang['synchronize'] = 'Sincronitza';
 $lang['enable_sync'] = 'Permet Sync';
 $lang['disable_sync'] = 'No permetis Sync';
+$lang['disable_sync_prompt'] = 'Are you sure that you want to disable the calendar synchronization?';
 $lang['reload'] = 'Recarrega';
 $lang['appointment'] = 'Cita';
 $lang['unavailable'] = 'No disponible';
diff --git a/application/language/chinese/translations_lang.php b/application/language/chinese/translations_lang.php
index a0eb86e4..a51349dd 100755
--- a/application/language/chinese/translations_lang.php
+++ b/application/language/chinese/translations_lang.php
@@ -60,6 +60,7 @@ $lang['log_out'] = '注销';
 $lang['synchronize'] = '同步';
 $lang['enable_sync'] = '开启同步';
 $lang['disable_sync'] = '关闭同步';
+$lang['disable_sync_prompt'] = 'Are you sure that you want to disable the calendar synchronization?';
 $lang['reload'] = '刷新';
 $lang['appointment'] = '预约';
 $lang['unavailable'] = '不可用';
diff --git a/application/language/czech/translations_lang.php b/application/language/czech/translations_lang.php
index 6db7c9d6..cc958c67 100644
--- a/application/language/czech/translations_lang.php
+++ b/application/language/czech/translations_lang.php
@@ -62,6 +62,7 @@ $lang['log_out'] = 'Odhlášení';
 $lang['synchronize'] = 'Synchronizace';
 $lang['enable_sync'] = 'Povolit synchronizaci';
 $lang['disable_sync'] = 'Zakázat synchronizaci';
+$lang['disable_sync_prompt'] = 'Are you sure that you want to disable the calendar synchronization?';
 $lang['reload'] = 'Obnovit';
 $lang['appointment'] = 'Schůzka';
 $lang['unavailable'] = 'Nedostupnost';
diff --git a/application/language/danish/translations_lang.php b/application/language/danish/translations_lang.php
index 7ff09800..5f846afa 100755
--- a/application/language/danish/translations_lang.php
+++ b/application/language/danish/translations_lang.php
@@ -60,6 +60,7 @@ $lang['log_out'] = 'Log ud';
 $lang['synchronize'] = 'Synkroniser';
 $lang['enable_sync'] = 'Aktivere';
 $lang['disable_sync'] = 'Deaktivere';
+$lang['disable_sync_prompt'] = 'Are you sure that you want to disable the calendar synchronization?';
 $lang['reload'] = 'Opdater';
 $lang['appointment'] = 'Aftale';
 $lang['unavailable'] = 'Ikke tilgængelig';
diff --git a/application/language/dutch/translations_lang.php b/application/language/dutch/translations_lang.php
index f1671b6c..d10a0540 100755
--- a/application/language/dutch/translations_lang.php
+++ b/application/language/dutch/translations_lang.php
@@ -60,6 +60,7 @@ $lang['log_out'] = 'Afmelden';
 $lang['synchronize'] = 'Synchroniseren';
 $lang['enable_sync'] = 'Synchronisatie inschakelen';
 $lang['disable_sync'] = 'Synchronisatie uitschakelen';
+$lang['disable_sync_prompt'] = 'Are you sure that you want to disable the calendar synchronization?';
 $lang['reload'] = 'Herladen';
 $lang['appointment'] = 'Afspraak';
 $lang['unavailable'] = 'Niet beschikbaar';
diff --git a/application/language/english/translations_lang.php b/application/language/english/translations_lang.php
index 1c586c84..b5f8df66 100755
--- a/application/language/english/translations_lang.php
+++ b/application/language/english/translations_lang.php
@@ -65,6 +65,7 @@ $lang['log_out'] = 'Log Out';
 $lang['synchronize'] = 'Synchronize';
 $lang['enable_sync'] = 'Enable Sync';
 $lang['disable_sync'] = 'Disable Sync';
+$lang['disable_sync_prompt'] = 'Are you sure that you want to disable the calendar synchronization?';
 $lang['reload'] = 'Reload';
 $lang['appointment'] = 'Appointment';
 $lang['unavailable'] = 'Unavailable';
diff --git a/application/language/finnish/translations_lang.php b/application/language/finnish/translations_lang.php
index 318cda46..48146c71 100755
--- a/application/language/finnish/translations_lang.php
+++ b/application/language/finnish/translations_lang.php
@@ -60,6 +60,7 @@ $lang['log_out'] = 'Kirjaudu ulos';
 $lang['synchronize'] = 'Synkronoi';
 $lang['enable_sync'] = 'Aktivoi synkronointi';
 $lang['disable_sync'] = 'Poista synkronointi';
+$lang['disable_sync_prompt'] = 'Are you sure that you want to disable the calendar synchronization?';
 $lang['reload'] = 'Lataa uudelleen';
 $lang['appointment'] = 'Varaus';
 $lang['unavailable'] = 'Poissaolo';
diff --git a/application/language/french/translations_lang.php b/application/language/french/translations_lang.php
index 25331341..3e6efe6d 100755
--- a/application/language/french/translations_lang.php
+++ b/application/language/french/translations_lang.php
@@ -64,6 +64,7 @@ $lang['log_out'] = 'Déconnexion';
 $lang['synchronize'] = 'Synchronisation';
 $lang['enable_sync'] = 'Activer la synchronisation';
 $lang['disable_sync'] = 'Désactiver la synchronisation';
+$lang['disable_sync_prompt'] = 'Are you sure that you want to disable the calendar synchronization?';
 $lang['reload'] = 'Actualiser';
 $lang['appointment'] = 'Rendez-vous';
 $lang['unavailable'] = 'Indisponible';
diff --git a/application/language/german/translations_lang.php b/application/language/german/translations_lang.php
index 085e32da..aecb0ac0 100755
--- a/application/language/german/translations_lang.php
+++ b/application/language/german/translations_lang.php
@@ -63,6 +63,7 @@ $lang['log_out'] = 'Abmelden';
 $lang['synchronize'] = 'Synchronisieren';
 $lang['enable_sync'] = 'Sync einschalten';
 $lang['disable_sync'] = 'Sync ausschalten';
+$lang['disable_sync_prompt'] = 'Are you sure that you want to disable the calendar synchronization?';
 $lang['reload'] = 'Neu laden';
 $lang['appointment'] = 'Termin';
 $lang['unavailable'] = 'Nicht möglich';
diff --git a/application/language/greek/translations_lang.php b/application/language/greek/translations_lang.php
index 8a3b33b8..905f91cc 100755
--- a/application/language/greek/translations_lang.php
+++ b/application/language/greek/translations_lang.php
@@ -60,6 +60,7 @@ $lang['log_out'] = 'Αποσύνδεση';
 $lang['synchronize'] = 'Συγχρονισμός';
 $lang['enable_sync'] = 'Ενεργοποίηση Συγχρ.';
 $lang['disable_sync'] = 'Απενεργοποίηση Συγχρ.';
+$lang['disable_sync_prompt'] = 'Are you sure that you want to disable the calendar synchronization?';
 $lang['reload'] = 'Επαναφόρτωση';
 $lang['appointment'] = 'Ραντεβού';
 $lang['unavailable'] = 'Μη Διαθέσιμος';
diff --git a/application/language/hebrew/translations_lang.php b/application/language/hebrew/translations_lang.php
index e160ffe4..68b04944 100644
--- a/application/language/hebrew/translations_lang.php
+++ b/application/language/hebrew/translations_lang.php
@@ -65,6 +65,7 @@ $lang['log_out'] = 'יציאה';
 $lang['synchronize'] = 'סינכרון';
 $lang['enable_sync'] = 'אפשר סינכרון';
 $lang['disable_sync'] = 'בטל סינכרון';
+$lang['disable_sync_prompt'] = 'Are you sure that you want to disable the calendar synchronization?';
 $lang['reload'] = 'רענון';
 $lang['appointment'] = 'פגישה';
 $lang['unavailable'] = 'אינו זמין';
@@ -326,4 +327,4 @@ $lang['load_more'] = 'טען עוד';
 $lang['list'] = 'רשימה';
 $lang['default'] = 'בְּרִירַת מֶחדָל';
 $lang['table'] = 'טבלה';
-$lang['date'] = 'תאריך';
\ No newline at end of file
+$lang['date'] = 'תאריך';
diff --git a/application/language/hindi/translations_lang.php b/application/language/hindi/translations_lang.php
index 340d7863..cd01f9e0 100755
--- a/application/language/hindi/translations_lang.php
+++ b/application/language/hindi/translations_lang.php
@@ -60,6 +60,7 @@ $lang['log_out'] = 'लॉग आउट';
 $lang['synchronize'] = 'सिंक्रनाइज़';
 $lang['enable_sync'] = 'सिंक सक्षम करें';
 $lang['disable_sync'] = 'सिंक अक्षम करें';
+$lang['disable_sync_prompt'] = 'Are you sure that you want to disable the calendar synchronization?';
 $lang['reload'] = 'रीलोड';
 $lang['appointment'] = 'अपॉइंटमेंट';
 $lang['unavailable'] = 'अनुपलब्ध';
diff --git a/application/language/hungarian/translations_lang.php b/application/language/hungarian/translations_lang.php
index 0a3b5e27..506de978 100755
--- a/application/language/hungarian/translations_lang.php
+++ b/application/language/hungarian/translations_lang.php
@@ -60,6 +60,7 @@ $lang['log_out'] = 'Kijelentkezés';
 $lang['synchronize'] = 'Szinkronizálás';
 $lang['enable_sync'] = 'Szinkronizálás engedélyezése';
 $lang['disable_sync'] = 'Szinkronizálás tiltása';
+$lang['disable_sync_prompt'] = 'Are you sure that you want to disable the calendar synchronization?';
 $lang['reload'] = 'Frissít';
 $lang['appointment'] = 'Időpont';
 $lang['unavailable'] = 'Nem áll rendelkezésre';
diff --git a/application/language/italian/translations_lang.php b/application/language/italian/translations_lang.php
index f236ce22..ffb9fee1 100755
--- a/application/language/italian/translations_lang.php
+++ b/application/language/italian/translations_lang.php
@@ -60,6 +60,7 @@ $lang['log_out'] = 'Esci';
 $lang['synchronize'] = 'Sincronizza';
 $lang['enable_sync'] = 'Abilita sincronizzazione';
 $lang['disable_sync'] = 'Disabilita sincronizzazione';
+$lang['disable_sync_prompt'] = 'Are you sure that you want to disable the calendar synchronization?';
 $lang['reload'] = 'Reload';
 $lang['appointment'] = 'Appointment';
 $lang['unavailable'] = 'Non disponibile';
diff --git a/application/language/japanese/translations_lang.php b/application/language/japanese/translations_lang.php
index f0ebf752..c4d586b4 100755
--- a/application/language/japanese/translations_lang.php
+++ b/application/language/japanese/translations_lang.php
@@ -60,6 +60,7 @@ $lang['log_out'] = 'ログアウト';
 $lang['synchronize'] = '同期';
 $lang['enable_sync'] = '同期有効化';
 $lang['disable_sync'] = '同期無効化';
+$lang['disable_sync_prompt'] = 'Are you sure that you want to disable the calendar synchronization?';
 $lang['reload'] = '再読込';
 $lang['appointment'] = '予約';
 $lang['unavailable'] = '空き無し';
diff --git a/application/language/luxembourgish/translations_lang.php b/application/language/luxembourgish/translations_lang.php
index 21775245..b7de2fac 100755
--- a/application/language/luxembourgish/translations_lang.php
+++ b/application/language/luxembourgish/translations_lang.php
@@ -60,6 +60,7 @@ $lang['log_out'] = 'Ofmellen';
 $lang['synchronize'] = 'Synchroniséieren';
 $lang['enable_sync'] = 'Sync aschalten';
 $lang['disable_sync'] = 'Sync ausschalten';
+$lang['disable_sync_prompt'] = 'Are you sure that you want to disable the calendar synchronization?';
 $lang['reload'] = 'Nei lueden';
 $lang['appointment'] = 'Termäin';
 $lang['unavailable'] = 'Net méiglech';
diff --git a/application/language/marathi/translations_lang.php b/application/language/marathi/translations_lang.php
index 86726e86..9160a2f6 100644
--- a/application/language/marathi/translations_lang.php
+++ b/application/language/marathi/translations_lang.php
@@ -62,6 +62,7 @@ $lang['log_out'] = 'लॉग आउट';
 $lang['synchronize'] = 'समक्रमित करा';
 $lang['enable_sync'] = 'समक्रमित सक्षम करा';
 $lang['disable_sync'] = 'समक्रमित अक्षम कर';
+$lang['disable_sync_prompt'] = 'Are you sure that you want to disable the calendar synchronization?';
 $lang['reload'] = 'रीलोड करा';
 $lang['appointment'] = 'अपॉइंटमेंट';
 $lang['unavailable'] = 'अनुपलब्ध';
diff --git a/application/language/polish/translations_lang.php b/application/language/polish/translations_lang.php
index b4e43dd8..ecf2b11e 100755
--- a/application/language/polish/translations_lang.php
+++ b/application/language/polish/translations_lang.php
@@ -60,6 +60,7 @@ $lang['log_out'] = 'Wyloguj';
 $lang['synchronize'] = 'Synchronizuj';
 $lang['enable_sync'] = 'Włącz Synch.';
 $lang['disable_sync'] = 'Wyłącz Synch.';
+$lang['disable_sync_prompt'] = 'Are you sure that you want to disable the calendar synchronization?';
 $lang['reload'] = 'Odśwież';
 $lang['appointment'] = 'Wizyta';
 $lang['unavailable'] = 'Niedostępne';
diff --git a/application/language/portuguese-br/translations_lang.php b/application/language/portuguese-br/translations_lang.php
index c19a8a20..dec40b13 100755
--- a/application/language/portuguese-br/translations_lang.php
+++ b/application/language/portuguese-br/translations_lang.php
@@ -60,6 +60,7 @@ $lang['log_out'] = 'Sair';
 $lang['synchronize'] = 'Sincronizar';
 $lang['enable_sync'] = 'Habilitar Sincronização';
 $lang['disable_sync'] = 'Desabiltar Sincronização';
+$lang['disable_sync_prompt'] = 'Are you sure that you want to disable the calendar synchronization?';
 $lang['reload'] = 'Atualizar';
 $lang['appointment'] = 'Agenda';
 $lang['unavailable'] = 'Indisponível';
diff --git a/application/language/portuguese/translations_lang.php b/application/language/portuguese/translations_lang.php
index 4b15e315..6b6a1b59 100755
--- a/application/language/portuguese/translations_lang.php
+++ b/application/language/portuguese/translations_lang.php
@@ -60,6 +60,7 @@ $lang['log_out'] = 'Sair';
 $lang['synchronize'] = 'Sincronizar';
 $lang['enable_sync'] = 'Ativar Sincronização';
 $lang['disable_sync'] = 'Desativar Sincronização';
+$lang['disable_sync_prompt'] = 'Are you sure that you want to disable the calendar synchronization?';
 $lang['reload'] = 'Carregar';
 $lang['appointment'] = 'Evento';
 $lang['unavailable'] = 'Indisponível';
diff --git a/application/language/romanian/translations_lang.php b/application/language/romanian/translations_lang.php
index a6cede5e..c813dd43 100755
--- a/application/language/romanian/translations_lang.php
+++ b/application/language/romanian/translations_lang.php
@@ -60,6 +60,7 @@ $lang['log_out'] = 'Iesire';
 $lang['synchronize'] = 'Sincronizare';
 $lang['enable_sync'] = 'Activeaza Sincronizare';
 $lang['disable_sync'] = 'Dezactiveaza Sincronizare';
+$lang['disable_sync_prompt'] = 'Are you sure that you want to disable the calendar synchronization?';
 $lang['reload'] = 'Reîncarcare';
 $lang['appointment'] = 'Întâlnire';
 $lang['unavailable'] = 'Indisponibil';
diff --git a/application/language/russian/translations_lang.php b/application/language/russian/translations_lang.php
index 79f71563..0c6b645f 100755
--- a/application/language/russian/translations_lang.php
+++ b/application/language/russian/translations_lang.php
@@ -60,6 +60,7 @@ $lang['log_out'] = 'Выйти';
 $lang['synchronize'] = 'Синхронизация';
 $lang['enable_sync'] = 'Включить синхронизацию';
 $lang['disable_sync'] = 'Отключить синхронизацию';
+$lang['disable_sync_prompt'] = 'Are you sure that you want to disable the calendar synchronization?';
 $lang['reload'] = 'Перегрузить';
 $lang['appointment'] = 'Назначение';
 $lang['unavailable'] = 'Недоступно';
diff --git a/application/language/slovak/translations_lang.php b/application/language/slovak/translations_lang.php
index 387f10c9..f3fe75e4 100755
--- a/application/language/slovak/translations_lang.php
+++ b/application/language/slovak/translations_lang.php
@@ -60,6 +60,7 @@ $lang['log_out'] = 'Odhlasiť sa';
 $lang['synchronize'] = 'Synchronizovať';
 $lang['enable_sync'] = 'Povoliť synchronizáciu';
 $lang['disable_sync'] = 'Zakázať synchronizáciu';
+$lang['disable_sync_prompt'] = 'Are you sure that you want to disable the calendar synchronization?';
 $lang['reload'] = 'Obnoviť';
 $lang['appointment'] = 'Rezervácie';
 $lang['unavailable'] = 'Nedostupné';
diff --git a/application/language/spanish/translations_lang.php b/application/language/spanish/translations_lang.php
index 960e32cd..0b611daf 100755
--- a/application/language/spanish/translations_lang.php
+++ b/application/language/spanish/translations_lang.php
@@ -60,6 +60,7 @@ $lang['log_out'] = 'Cerrar sesión';
 $lang['synchronize'] = 'Sincronizar';
 $lang['enable_sync'] = 'Habilitar sincronización';
 $lang['disable_sync'] = 'Deshabilitar sincronización';
+$lang['disable_sync_prompt'] = 'Are you sure that you want to disable the calendar synchronization?';
 $lang['reload'] = 'Cargar nuevamente';
 $lang['appointment'] = 'Cita';
 $lang['unavailable'] = 'No disponible';
diff --git a/application/language/swedish/translations_lang.php b/application/language/swedish/translations_lang.php
index a721ce67..e8411695 100644
--- a/application/language/swedish/translations_lang.php
+++ b/application/language/swedish/translations_lang.php
@@ -60,6 +60,7 @@ $lang['log_out'] = 'Logga ut';
 $lang['synchronize'] = 'Synkronisera';
 $lang['enable_sync'] = 'Aktivera';
 $lang['disable_sync'] = 'Deaktivera';
+$lang['disable_sync_prompt'] = 'Are you sure that you want to disable the calendar synchronization?';
 $lang['reload'] = 'Uppdatera';
 $lang['appointment'] = 'Bokning';
 $lang['unavailable'] = 'Inte tillgänglig';
diff --git a/application/language/turkish/translations_lang.php b/application/language/turkish/translations_lang.php
index 6aa811d6..f0e1c31b 100755
--- a/application/language/turkish/translations_lang.php
+++ b/application/language/turkish/translations_lang.php
@@ -60,6 +60,7 @@ $lang['log_out'] = 'Çıkış';
 $lang['synchronize'] = 'Eşitle';
 $lang['enable_sync'] = 'Eşitlemeyi Aç';
 $lang['disable_sync'] = 'Eşitlemeyi Kapat';
+$lang['disable_sync_prompt'] = 'Are you sure that you want to disable the calendar synchronization?';
 $lang['reload'] = 'Tekrar Yükle';
 $lang['appointment'] = 'Randevu';
 $lang['unavailable'] = 'Uygun Değil';
diff --git a/assets/js/backend_calendar_default_view.js b/assets/js/backend_calendar_default_view.js
index 2696f784..aff5a3b3 100755
--- a/assets/js/backend_calendar_default_view.js
+++ b/assets/js/backend_calendar_default_view.js
@@ -229,7 +229,6 @@ window.BackendCalendarDefaultView = window.BackendCalendarDefaultView || {};
                     }
                 ];
 
-
                 GeneralFunctions.displayMessageBox(EALang.delete_appointment_title,
                     EALang.write_appointment_removal_reason, buttons);
 
diff --git a/assets/js/backend_calendar_google_sync.js b/assets/js/backend_calendar_google_sync.js
index 269261a6..489cc4c3 100644
--- a/assets/js/backend_calendar_google_sync.js
+++ b/assets/js/backend_calendar_google_sync.js
@@ -81,31 +81,50 @@ window.BackendCalendarGoogleSync = window.BackendCalendarGoogleSync || {};
                             }
                         }
                     } catch (Error) {
-                        // Accessing the document object before the window is loaded throws an error, but
-                        // it will only happen during the initialization of the window. Attaching "load"
-                        // event handling is not possible due to CORS restrictions.
+                        // Accessing the document object before the window is loaded throws an error, but it will only
+                        // happen during the initialization of the window. Attaching "load" event handling is not
+                        // possible due to CORS restrictions.
                     }
                 }, 100);
 
             } else {
-                // Disable synchronization for selected provider.
-                // Update page elements and make an AJAX call to remove the google sync setting of the
-                // selected provider.
-                var providerId = $('#select-filter-item').val();
+                var buttons = [
+                    {
+                        text: EALang.cancel,
+                        click: function () {
+                            $('#message-box').dialog('close');
+                        }
+                    },
+                    {
+                        text: 'OK',
+                        click: function () {
+                            // Disable synchronization for selected provider.
+                            var providerId = $('#select-filter-item').val();
 
-                var provider = GlobalVariables.availableProviders.find(function (availableProvider) {
-                    return Number(availableProvider.id) === Number(providerId);
-                });
+                            var provider = GlobalVariables.availableProviders.find(function (availableProvider) {
+                                return Number(availableProvider.id) === Number(providerId);
+                            });
 
-                provider.settings.google_sync = '0';
-                provider.settings.google_token = null;
+                            if (!provider) {
+                                throw new Error('Provider not found: ' + providerId);
+                            }
 
-                disableProviderSync(provider.id);
+                            provider.settings.google_sync = '0';
+                            provider.settings.google_token = null;
 
-                $('#enable-sync').removeClass('btn-secondary enabled').addClass('btn-light');
-                $('#enable-sync span').text(EALang.enable_sync);
-                $('#google-sync').prop('disabled', true);
-                $('#select-filter-item option:selected').attr('google-sync', 'false');
+                            disableProviderSync(provider.id);
+
+                            $('#enable-sync').removeClass('btn-secondary enabled').addClass('btn-light');
+                            $('#enable-sync span').text(EALang.enable_sync);
+                            $('#google-sync').prop('disabled', true);
+                            $('#select-filter-item option:selected').attr('google-sync', 'false');
+
+                            $('#message-box').dialog('close');
+                        }
+                    }
+                ];
+
+                GeneralFunctions.displayMessageBox(EALang.disable_sync, EALang.disable_sync_prompt, buttons);
             }
         });
 
@@ -158,8 +177,7 @@ window.BackendCalendarGoogleSync = window.BackendCalendarGoogleSync || {};
      * @param {Number} providerId The selected provider record ID.
      */
     function disableProviderSync(providerId) {
-        // Make an ajax call to the server in order to disable the setting
-        // from the database.
+        // Make an ajax call to the server in order to disable the setting from the database.
         var url = GlobalVariables.baseUrl + '/index.php/backend_api/ajax_disable_provider_sync';
 
         var data = {