diff --git a/assets/js/backend_calendar.js b/assets/js/backend_calendar.js
index b50f0f2d..5c9b260c 100755
--- a/assets/js/backend_calendar.js
+++ b/assets/js/backend_calendar.js
@@ -25,7 +25,7 @@ window.BackendCalendar = window.BackendCalendar || {};
     /**
      * Bind common event handlers.
      */
-    function _bindEventHandlers() {
+    function bindEventHandlers() {
         var $calendarPage = $('#calendar-page');
 
         $calendarPage.on('click', '#toggle-fullscreen', function () {
@@ -87,7 +87,7 @@ window.BackendCalendar = window.BackendCalendar || {};
         BackendCalendarUnavailabilitiesModal.initialize();
         BackendCalendarExtraPeriodsModal.initialize();
 
-        _bindEventHandlers();
+        bindEventHandlers();
     };
 
 })(window.BackendCalendar);
diff --git a/assets/js/backend_calendar_appointments_modal.js b/assets/js/backend_calendar_appointments_modal.js
index ad07eeb6..81e8e593 100755
--- a/assets/js/backend_calendar_appointments_modal.js
+++ b/assets/js/backend_calendar_appointments_modal.js
@@ -22,7 +22,7 @@ window.BackendCalendarAppointmentsModal = window.BackendCalendarAppointmentsModa
 
     'use strict';
 
-    function _updateTimezone() {
+    function updateTimezone() {
         var providerId = $('#select-provider').val();
 
         var provider  = GlobalVariables.availableProviders.filter(function(availableProvider) {
@@ -34,7 +34,7 @@ window.BackendCalendarAppointmentsModal = window.BackendCalendarAppointmentsModa
         }
     }
 
-    function _bindEventHandlers() {
+    function bindEventHandlers() {
         /**
          * Event: Manage Appointments Dialog Cancel Button "Click"
          *
@@ -51,7 +51,7 @@ window.BackendCalendarAppointmentsModal = window.BackendCalendarAppointmentsModa
          */
         $('#manage-appointment #save-appointment').click(function () {
             // Before doing anything the appointment data need to be validated.
-            if (!_validateAppointmentForm()) {
+            if (!validateAppointmentForm()) {
                 return;
             }
 
@@ -321,7 +321,7 @@ window.BackendCalendarAppointmentsModal = window.BackendCalendarAppointmentsModa
          * Event: Provider "Change"
          */
         $('#select-provider').change(function () {
-            _updateTimezone();
+            updateTimezone();
         });
 
         /**
@@ -488,7 +488,7 @@ window.BackendCalendarAppointmentsModal = window.BackendCalendarAppointmentsModa
      *
      * @return {Boolean} Returns the validation result.
      */
-    function _validateAppointmentForm() {
+    function validateAppointmentForm() {
         var $dialog = $('#manage-appointment');
 
         // Reset previous validation css formatting.
@@ -532,7 +532,7 @@ window.BackendCalendarAppointmentsModal = window.BackendCalendarAppointmentsModa
     }
 
     exports.initialize = function () {
-        _bindEventHandlers();
+        bindEventHandlers();
     };
 
 })(window.BackendCalendarAppointmentsModal);
diff --git a/assets/js/backend_calendar_default_view.js b/assets/js/backend_calendar_default_view.js
index 1f538291..e8b43883 100755
--- a/assets/js/backend_calendar_default_view.js
+++ b/assets/js/backend_calendar_default_view.js
@@ -31,7 +31,7 @@ window.BackendCalendarDefaultView = window.BackendCalendarDefaultView || {};
     /**
      * Bind event handlers for the calendar view.
      */
-    function _bindEventHandlers() {
+    function bindEventHandlers() {
         var $calendarPage = $('#calendar-page');
 
         /**
@@ -40,7 +40,7 @@ window.BackendCalendarDefaultView = window.BackendCalendarDefaultView || {};
          * When the user clicks the reload button an the calendar items need to be refreshed.
          */
         $('#reload-appointments').click(function () {
-            _refreshCalendarAppointments(
+            refreshCalendarAppointments(
                 $('#calendar'),
                 $('#select-filter-item').val(),
                 $('#select-filter-item').find('option:selected').attr('type'),
@@ -264,7 +264,7 @@ window.BackendCalendarDefaultView = window.BackendCalendarDefaultView || {};
      *
      * @return {Number} Returns the calendar element height in pixels.
      */
-    function _getCalendarHeight() {
+    function getCalendarHeight() {
         var result = window.innerHeight - $('#footer').outerHeight() - $('#header').outerHeight()
             - $('#calendar-toolbar').outerHeight() - 60; // 60 for fine tuning
         return (result > 500) ? result : 500; // Minimum height is 500px
@@ -276,7 +276,7 @@ window.BackendCalendarDefaultView = window.BackendCalendarDefaultView || {};
      * When the user clicks on an appointment object on the calendar, then a data preview popover is display
      * above the calendar item.
      */
-    function _calendarEventClick(event, jsEvent, view) {
+    function calendarEventClick(event, jsEvent, view) {
         $('.popover').remove(); // Close all open popovers.
 
         var html;
@@ -427,7 +427,7 @@ window.BackendCalendarDefaultView = window.BackendCalendarDefaultView || {};
      *
      * @see updateAppointmentData()
      */
-    function _calendarEventResize(event, delta, revertFunc, jsEvent, ui, view) {
+    function calendarEventResize(event, delta, revertFunc, jsEvent, ui, view) {
         if (GlobalVariables.user.privileges.appointments.edit === false) {
             revertFunc();
             Backend.displayNotification(EALang.no_privileges_edit_appointments);
@@ -550,10 +550,10 @@ window.BackendCalendarDefaultView = window.BackendCalendarDefaultView || {};
      * The calendar element needs to be re-sized too in order to fit into the window. Nevertheless, if the window
      * becomes very small the the calendar won't shrink anymore.
      *
-     * @see _getCalendarHeight()
+     * @see getCalendarHeight()
      */
-    function _calendarWindowResize(view) {
-        $('#calendar').fullCalendar('option', 'height', _getCalendarHeight());
+    function calendarWindowResize(view) {
+        $('#calendar').fullCalendar('option', 'height', getCalendarHeight());
     }
 
     /**
@@ -562,7 +562,7 @@ window.BackendCalendarDefaultView = window.BackendCalendarDefaultView || {};
      * When the user clicks on a day square on the calendar, then he will automatically be transferred to that
      * day view calendar.
      */
-    function _calendarDayClick(date, jsEvent, view) {
+    function calendarDayClick(date, jsEvent, view) {
         if (!date.hasTime()) {
             $('#calendar').fullCalendar('changeView', 'agendaDay');
             $('#calendar').fullCalendar('gotoDate', date);
@@ -575,7 +575,7 @@ window.BackendCalendarDefaultView = window.BackendCalendarDefaultView || {};
      * This event handler is triggered whenever the user drags and drops an event into a different position
      * on the calendar. We need to update the database with this change. This is done via an ajax call.
      */
-    function _calendarEventDrop(event, delta, revertFunc, jsEvent, ui, view) {
+    function calendarEventDrop(event, delta, revertFunc, jsEvent, ui, view) {
         if (GlobalVariables.user.privileges.appointments.edit === false) {
             revertFunc();
             Backend.displayNotification(EALang.no_privileges_edit_appointments);
@@ -710,12 +710,12 @@ window.BackendCalendarDefaultView = window.BackendCalendarDefaultView || {};
      * Whenever the calendar changes or refreshes its view certain actions need to be made, in order to
      * display proper information to the user.
      */
-    function _calendarViewRender() {
+    function calendarViewRender() {
         if ($('#select-filter-item').val() === null) {
             return;
         }
 
-        _refreshCalendarAppointments(
+        refreshCalendarAppointments(
             $('#calendar'),
             $('#select-filter-item').val(),
             $('#select-filter-item option:selected').attr('type'),
@@ -743,7 +743,7 @@ window.BackendCalendarDefaultView = window.BackendCalendarDefaultView || {};
      * not the $.html() method. So in order for the title to display the html properly we convert all the
      * .fc-event-titles where needed into html.
      */
-    function _convertTitlesToHtml() {
+    function convertTitlesToHtml() {
         // Convert the titles to html code.
         $('.fc-custom').each(function () {
             var title = $(this).find('.fc-event-title').text();
@@ -764,7 +764,7 @@ window.BackendCalendarDefaultView = window.BackendCalendarDefaultView || {};
      * @param {Date} startDate Visible start date of the calendar.
      * @param {Date} endDate Visible end date of the calendar.
      */
-    function _refreshCalendarAppointments($calendar, recordId, filterType, startDate, endDate) {
+    function refreshCalendarAppointments($calendar, recordId, filterType, startDate, endDate) {
         var url = GlobalVariables.baseUrl + '/index.php/backend_api/ajax_get_calendar_appointments';
 
         var data = {
@@ -1165,7 +1165,7 @@ window.BackendCalendarDefaultView = window.BackendCalendarDefaultView || {};
         // Initialize page calendar
         $('#calendar').fullCalendar({
             defaultView: defaultView,
-            height: _getCalendarHeight(),
+            height: getCalendarHeight(),
             editable: true,
             firstDay: firstWeekdayNumber,
             snapDuration: '00:30:00',
@@ -1248,17 +1248,17 @@ window.BackendCalendarDefaultView = window.BackendCalendarDefaultView || {};
             },
 
             // Calendar events need to be declared on initialization.
-            windowResize: _calendarWindowResize,
-            viewRender: _calendarViewRender,
-            dayClick: _calendarDayClick,
-            eventClick: _calendarEventClick,
-            eventResize: _calendarEventResize,
-            eventDrop: _calendarEventDrop,
-            eventAfterAllRender: _convertTitlesToHtml
+            windowResize: calendarWindowResize,
+            viewRender: calendarViewRender,
+            dayClick: calendarDayClick,
+            eventClick: calendarEventClick,
+            eventResize: calendarEventResize,
+            eventDrop: calendarEventDrop,
+            eventAfterAllRender: convertTitlesToHtml
         });
 
         // Trigger once to set the proper footer position after calendar initialization.
-        _calendarWindowResize();
+        calendarWindowResize();
 
         // Fill the select list boxes of the page.
         if (GlobalVariables.availableProviders.length > 0) {
@@ -1327,7 +1327,7 @@ window.BackendCalendarDefaultView = window.BackendCalendarDefaultView || {};
         }
 
         // Bind the default event handlers.
-        _bindEventHandlers();
+        bindEventHandlers();
 
         $('#select-filter-item').trigger('change');
 
@@ -1400,7 +1400,7 @@ window.BackendCalendarDefaultView = window.BackendCalendarDefaultView || {};
         var $selectFilterItem = $('#select-filter-item');
 
         setInterval(function () {
-            _refreshCalendarAppointments(
+            refreshCalendarAppointments(
                 $calendar,
                 $selectFilterItem.val(),
                 $selectFilterItem.find('option:selected').attr('type'),
diff --git a/assets/js/backend_calendar_extra_periods_modal.js b/assets/js/backend_calendar_extra_periods_modal.js
index 6335589f..fb1b2928 100644
--- a/assets/js/backend_calendar_extra_periods_modal.js
+++ b/assets/js/backend_calendar_extra_periods_modal.js
@@ -22,7 +22,7 @@ window.BackendCalendarExtraPeriodsModal = window.BackendCalendarExtraPeriodsModa
 
     'use strict';
 
-    function _bindEventHandlers() {
+    function bindEventHandlers() {
         /**
          * Event: Manage extra Dialog Save Button "Click"
          *
@@ -226,7 +226,7 @@ window.BackendCalendarExtraPeriodsModal = window.BackendCalendarExtraPeriodsModa
             extraProvider.append(new Option(provider.first_name + ' ' + provider.last_name, provider.id));
         }
 
-        _bindEventHandlers();
+        bindEventHandlers();
     };
 
 })(window.BackendCalendarExtraPeriodsModal);
diff --git a/assets/js/backend_calendar_google_sync.js b/assets/js/backend_calendar_google_sync.js
index 94f5aaa9..013744ec 100644
--- a/assets/js/backend_calendar_google_sync.js
+++ b/assets/js/backend_calendar_google_sync.js
@@ -25,7 +25,7 @@ window.BackendCalendarGoogleSync = window.BackendCalendarGoogleSync || {};
     /**
      * Bind event handlers.
      */
-    function _bindEventHandlers() {
+    function bindEventHandlers() {
         /**
          * Event: Enable - Disable Synchronization Button "Click"
          *
@@ -97,7 +97,7 @@ window.BackendCalendarGoogleSync = window.BackendCalendarGoogleSync || {};
                         provider.settings.google_sync = '0';
                         provider.settings.google_token = null;
 
-                        _disableProviderSync(provider.id);
+                        disableProviderSync(provider.id);
 
                         $('#enable-sync').removeClass('btn-danger enabled');
                         $('#enable-sync span:eq(1)').text(EALang.enable_sync);
@@ -166,7 +166,7 @@ window.BackendCalendarGoogleSync = window.BackendCalendarGoogleSync || {};
      *
      * @param {Number} providerId The selected provider record ID.
      */
-    function _disableProviderSync(providerId) {
+    function disableProviderSync(providerId) {
         // 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';
@@ -182,7 +182,7 @@ window.BackendCalendarGoogleSync = window.BackendCalendarGoogleSync || {};
 
 
     exports.initialize = function () {
-        _bindEventHandlers();
+        bindEventHandlers();
     };
 
 })(window.BackendCalendarGoogleSync);
diff --git a/assets/js/backend_calendar_unavailabilities_modal.js b/assets/js/backend_calendar_unavailabilities_modal.js
index 3d320039..f565d120 100755
--- a/assets/js/backend_calendar_unavailabilities_modal.js
+++ b/assets/js/backend_calendar_unavailabilities_modal.js
@@ -22,7 +22,7 @@ window.BackendCalendarUnavailabilitiesModal = window.BackendCalendarUnavailabili
 
     'use strict';
 
-    function _bindEventHandlers() {
+    function bindEventHandlers() {
         /**
          * Event: Manage Unavailable Dialog Save Button "Click"
          *
@@ -230,7 +230,7 @@ window.BackendCalendarUnavailabilitiesModal = window.BackendCalendarUnavailabili
             $unavailabilityProvider.append(new Option(provider.first_name + ' ' + provider.last_name, provider.id));
         }
 
-        _bindEventHandlers();
+        bindEventHandlers();
     };
 
 })(window.BackendCalendarUnavailabilitiesModal);
diff --git a/assets/js/backend_customers.js b/assets/js/backend_customers.js
index 2832cb3c..bb1a021e 100644
--- a/assets/js/backend_customers.js
+++ b/assets/js/backend_customers.js
@@ -47,14 +47,14 @@ window.BackendCustomers = window.BackendCustomers || {};
         helper.filter('');
 
         if (defaultEventHandlers) {
-            _bindEventHandlers();
+            bindEventHandlers();
         }
     };
 
     /**
      * Default event handlers declaration for backend customers page.
      */
-    function _bindEventHandlers() {
+    function bindEventHandlers() {
         helper.bindEventHandlers();
     }
 
diff --git a/assets/js/backend_services.js b/assets/js/backend_services.js
index 172b7dcf..1c4c5f3d 100644
--- a/assets/js/backend_services.js
+++ b/assets/js/backend_services.js
@@ -35,10 +35,10 @@ window.BackendServices = window.BackendServices || {};
     /**
      * Default initialize method of the page.
      *
-     * @param {Boolean} bindEventHandlers Optional (true), determines whether to bind the  default event handlers.
+     * @param {Boolean} [defaultEventHandlers] Optional (true), determines whether to bind the  default event handlers.
      */
-    exports.initialize = function (bindEventHandlers) {
-        bindEventHandlers = bindEventHandlers || true;
+    exports.initialize = function (defaultEventHandlers) {
+        defaultEventHandlers = defaultEventHandlers || true;
 
         // Fill available service categories listbox.
         $.each(GlobalVariables.categories, function (index, category) {
@@ -52,8 +52,8 @@ window.BackendServices = window.BackendServices || {};
         helper.resetForm();
         helper.filter('');
 
-        if (bindEventHandlers) {
-            _bindEventHandlers();
+        if (defaultEventHandlers) {
+            bindEventHandlers();
         }
     };
 
@@ -62,7 +62,7 @@ window.BackendServices = window.BackendServices || {};
      *
      * Do not use this method if you include the "BackendServices" namespace on another page.
      */
-    function _bindEventHandlers() {
+    function bindEventHandlers() {
         /**
          * Event: Page Tab Button "Click"
          *
diff --git a/assets/js/backend_settings.js b/assets/js/backend_settings.js
index 881f76a1..5525e259 100644
--- a/assets/js/backend_settings.js
+++ b/assets/js/backend_settings.js
@@ -136,7 +136,7 @@ window.BackendSettings = window.BackendSettings || {};
         settings = new SystemSettings();
 
         if (bindEventHandlers) {
-            _bindEventHandlers();
+            bindEventHandlers();
             var $link = $('#settings-page .nav li').not('.hidden').first().find('a');
             $link.tab('show');
         }
@@ -160,7 +160,7 @@ window.BackendSettings = window.BackendSettings || {};
      *
      * This method depends on the backend/settings html, so do not use this method on a different page.
      */
-    function _bindEventHandlers() {
+    function bindEventHandlers() {
         exports.wp.bindEventHandlers();
 
         /**
diff --git a/assets/js/backend_users.js b/assets/js/backend_users.js
index 285d76f5..7772f328 100644
--- a/assets/js/backend_users.js
+++ b/assets/js/backend_users.js
@@ -102,7 +102,7 @@ window.BackendUsers = window.BackendUsers || {};
 
         // Bind event handlers.
         if (defaultEventHandlers) {
-            _bindEventHandlers();
+            bindEventHandlers();
         }
     };
 
@@ -110,7 +110,7 @@ window.BackendUsers = window.BackendUsers || {};
      * Binds the default backend users event handlers. Do not use this method on a different
      * page because it needs the backend users page DOM.
      */
-    function _bindEventHandlers() {
+    function bindEventHandlers() {
         /**
          * Event: Page Tab Button "Click"
          *
diff --git a/assets/js/frontend_book.js b/assets/js/frontend_book.js
index c029742f..3f8d9876 100644
--- a/assets/js/frontend_book.js
+++ b/assets/js/frontend_book.js
@@ -53,8 +53,8 @@ window.FrontendBook = window.FrontendBook || {};
      * @param {Boolean} manageMode (OPTIONAL) Determines whether the customer is going
      * to make  changes to an existing appointment rather than booking a new one.
      */
-    exports.initialize = function (bindEventHandlers, manageMode) {
-        bindEventHandlers = bindEventHandlers || true;
+    exports.initialize = function (defaultEventHandlers, manageMode) {
+        defaultEventHandlers = defaultEventHandlers || true;
         manageMode = manageMode || false;
 
         if (window.console) {
@@ -147,13 +147,13 @@ window.FrontendBook = window.FrontendBook || {};
         $('#select-timezone').val(Intl.DateTimeFormat().resolvedOptions().timeZone);
 
         // Bind the event handlers (might not be necessary every time we use this class).
-        if (bindEventHandlers) {
-            _bindEventHandlers();
+        if (defaultEventHandlers) {
+            bindEventHandlers();
         }
 
         // If the manage mode is true, the appointments data should be loaded by default.
         if (FrontendBook.manageMode) {
-            _applyAppointmentData(GlobalVariables.appointmentData,
+            applyAppointmentData(GlobalVariables.appointmentData,
                 GlobalVariables.providerData, GlobalVariables.customerData);
         } else {
             var $selectProvider = $('#select-provider');
@@ -196,7 +196,7 @@ window.FrontendBook = window.FrontendBook || {};
     /**
      * This method binds the necessary event handlers for the book appointments page.
      */
-    function _bindEventHandlers() {
+    function bindEventHandlers() {
         /**
          * Event: Timezone "Changed"
          */
@@ -253,7 +253,7 @@ window.FrontendBook = window.FrontendBook || {};
             FrontendBookApi.getUnavailableDates($('#select-provider').val(), $(this).val(),
                 $('#select-date').datepicker('getDate').toString('yyyy-MM-dd'));
             FrontendBook.updateConfirmFrame();
-            _updateServiceDescription($('#select-service').val(), $('#service-description'));
+            updateServiceDescription($('#select-service').val(), $('#service-description'));
         });
 
         /**
@@ -286,7 +286,7 @@ window.FrontendBook = window.FrontendBook || {};
             // If we are on the 3rd tab then we will need to validate the user's
             // input before proceeding to the next step.
             if ($(this).attr('data-step_index') === '3') {
-                if (!_validateCustomerForm()) {
+                if (!validateCustomerForm()) {
                     return; // Validation failed, do not continue.
                 } else {
                     FrontendBook.updateConfirmFrame();
@@ -457,7 +457,7 @@ window.FrontendBook = window.FrontendBook || {};
      *
      * @return {Boolean} Returns the validation result.
      */
-    function _validateCustomerForm() {
+    function validateCustomerForm() {
         $('#wizard-frame-3 .has-error').removeClass('has-error');
         $('#wizard-frame-3 label.text-danger').removeClass('text-danger');
 
@@ -583,7 +583,7 @@ window.FrontendBook = window.FrontendBook || {};
         data.appointment = {
             start_datetime: $('#select-date').datepicker('getDate').toString('yyyy-MM-dd')
             + ' ' + Date.parse($('.selected-hour').text()).toString('HH:mm') + ':00',
-            end_datetime: _calcEndDatetime(),
+            end_datetime: calculateEndDatetime(),
             notes: $('#notes').val(),
             is_unavailable: false,
             id_users_provider: $('#select-provider').val(),
@@ -606,7 +606,7 @@ window.FrontendBook = window.FrontendBook || {};
      *
      * @return {String} Returns the end datetime in string format.
      */
-    function _calcEndDatetime() {
+    function calculateEndDatetime() {
         // Find selected service duration.
         var serviceId = $('#select-service').val();
         var serviceDuration;
@@ -643,7 +643,7 @@ window.FrontendBook = window.FrontendBook || {};
      *
      * @return {Boolean} Returns the operation result.
      */
-    function _applyAppointmentData(appointment, provider, customer) {
+    function applyAppointmentData(appointment, provider, customer) {
         try {
             // Select Service & Provider
             $('#select-service').val(appointment.id_services).trigger('change');
@@ -683,7 +683,7 @@ window.FrontendBook = window.FrontendBook || {};
      * @param {Object} $div The destination div jquery object (e.g. provide $('#div-id')
      * object as value).
      */
-    function _updateServiceDescription(serviceId, $div) {
+    function updateServiceDescription(serviceId, $div) {
         var html = '';
 
         $.each(GlobalVariables.availableServices, function (index, service) {
diff --git a/assets/js/frontend_book_api.js b/assets/js/frontend_book_api.js
index bb2f096f..bd7ce4ce 100755
--- a/assets/js/frontend_book_api.js
+++ b/assets/js/frontend_book_api.js
@@ -255,16 +255,16 @@ window.FrontendBookApi = window.FrontendBookApi || {};
             .done(function (response) {
                 unavailableDatesBackup = response;
                 selectedDateStringBackup = selectedDateString;
-                _applyUnavailableDates(response, selectedDateString, true);
+                applyUnavailableDates(response, selectedDateString, true);
             })
             .fail(GeneralFunctions.ajaxFailureHandler);
     };
 
     exports.applyPreviousUnavailableDates = function () {
-        _applyUnavailableDates(unavailableDatesBackup, selectedDateStringBackup);
+        applyUnavailableDates(unavailableDatesBackup, selectedDateStringBackup);
     };
 
-    function _applyUnavailableDates(unavailableDates, selectedDateString, setDate) {
+    function applyUnavailableDates(unavailableDates, selectedDateString, setDate) {
         setDate = setDate || false;
 
         processingUnavailabilities = true;