diff --git a/src/assets/js/backend_customers_helper.js b/src/assets/js/backend_customers_helper.js
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+/* ----------------------------------------------------------------------------
+ * Easy!Appointments - Open Source Web Scheduler
+ *
+ * @package     EasyAppointments
+ * @author      A.Tselegidis <alextselegidis@gmail.com>
+ * @copyright   Copyright (c) 2013 - 2016, Alex Tselegidis
+ * @license     http://opensource.org/licenses/GPL-3.0 - GPLv3
+ * @link        http://easyappointments.org
+ * @since       v1.0.0
+ * ---------------------------------------------------------------------------- */
+
+/**
+ * This class contains the methods that are used in the backend customers page.
+ *
+ * @class CustomersHelper
+ */
+(function() {
+
+    'use strict';
+
+    function CustomersHelper() {
+        this.filterResults = {};
+    };
+
+    /**
+     * Binds the default event handlers of the backend customers page.
+     */
+    CustomersHelper.prototype.bindEventHandlers = function() {
+        var instance = this;
+
+        /**
+         * Event: Filter Customers Form "Submit"
+         */
+        $('#filter-customers form').submit(function(event) {
+            var key = $('#filter-customers .key').val();
+            $('#filter-customers .selected-row').removeClass('selected-row');
+            instance.resetForm();
+            instance.filter(key);
+            return false;
+        });
+
+        /**
+         * Event: Filter Customers Clear Button "Click"
+         */
+        $('#filter-customers .clear').click(function() {
+            $('#filter-customers .key').val('');
+            instance.filter('');
+            instance.resetForm();
+        });
+
+        /**
+         * Event: Customer Row "Click"
+         *
+         * Display the customer data of the selected row.
+         */
+        $(document).on('click', '.customer-row', function() {
+            if ($('#filter-customers .filter').prop('disabled')) {
+                return; // Do nothing when user edits a customer record.
+            }
+
+            var customerId = $(this).attr('data-id'),
+                customer = {};
+            $.each(instance.filterResults, function(index, item) {
+                if (item.id == customerId) {
+                    customer = item;
+                    return false;
+                }
+            });
+
+            instance.display(customer);
+            $('#filter-customers .selected-row').removeClass('selected-row');
+            $(this).addClass('selected-row');
+            $('#edit-customer, #delete-customer').prop('disabled', false);
+        });
+
+        /**
+         * Event: Appointment Row "Click"
+         *
+         * Display appointment data of the selected row.
+         */
+        $(document).on('click', '.appointment-row', function() {
+            $('#customer-appointments .selected-row').removeClass('selected-row');
+            $(this).addClass('selected-row');
+
+            var customerId = $('#filter-customers .selected-row').attr('data-id'),
+                appointmentId = $(this).attr('data-id'),
+                appointment = {};
+
+            $.each(instance.filterResults, function(index, c) {
+                if (c.id === customerId) {
+                    $.each(c.appointments, function(index, a) {
+                        if (a.id == appointmentId) {
+                            appointment = a;
+                            return false;
+                        }
+                    });
+                    return false;
+                }
+            });
+
+            instance.displayAppointment(appointment);
+        });
+
+        /**
+         * Event: Add Customer Button "Click"
+         */
+        $('#add-customer').click(function() {
+            instance.resetForm();
+            $('#add-edit-delete-group').hide();
+            $('#save-cancel-group').show();
+            $('.details').find('input, textarea').prop('readonly', false);
+
+            $('#filter-customers button').prop('disabled', true);
+            $('#filter-customers .results').css('color', '#AAA');
+        });
+
+        /**
+         * Event: Edit Customer Button "Click"
+         */
+        $('#edit-customer').click(function() {
+            $('.details').find('input, textarea').prop('readonly', false);
+            $('#add-edit-delete-group').hide();
+            $('#save-cancel-group').show();
+
+            $('#filter-customers button').prop('disabled', true);
+            $('#filter-customers .results').css('color', '#AAA');
+        });
+
+        /**
+         * Event: Cancel Customer Add/Edit Operation Button "Click"
+         */
+        $('#cancel-customer').click(function() {
+            var id = $('#customer-id').val();
+            instance.resetForm();
+            if (id != '') {
+                instance.select(id, true);
+            }
+        });
+
+        /**
+         * Event: Save Add/Edit Customer Operation "Click"
+         */
+        $('#save-customer').click(function() {
+            var customer = {
+                'first_name': $('#first-name').val(),
+                'last_name': $('#last-name').val(),
+                'email': $('#email').val(),
+                'phone_number': $('#phone-number').val(),
+                'address': $('#address').val(),
+                'city': $('#city').val(),
+                'zip_code': $('#zip-code').val(),
+                'notes': $('#notes').val()
+            };
+
+            if ($('#customer-id').val() != '') {
+                customer.id = $('#customer-id').val();
+            }
+
+            if (!instance.validate(customer)) return;
+
+            instance.save(customer);
+        });
+
+        /**
+         * Event: Delete Customer Button "Click"
+         */
+        $('#delete-customer').click(function() {
+            var customerId = $('#customer-id').val(),
+                messageBtns = {};
+
+            messageBtns[EALang['delete']] = function() {
+                instance.delete(customerId);
+                $('#message_box').dialog('close');
+            };
+
+            messageBtns[EALang['cancel']] = function() {
+                $('#message_box').dialog('close');
+            };
+
+            GeneralFunctions.displayMessageBox(EALang['delete_customer'],
+                    EALang['delete_record_prompt'], messageBtns);
+        });
+    };
+
+    /**
+     * Save a customer record to the database (via ajax post).
+     *
+     * @param {object} customer Contains the customer data.
+     */
+    CustomersHelper.prototype.save = function(customer) {
+        var postUrl = GlobalVariables.baseUrl + '/index.php/backend_api/ajax_save_customer',
+            postData = {
+                'csrfToken': GlobalVariables.csrfToken,
+                'customer': JSON.stringify(customer)
+            };
+
+        $.post(postUrl, postData, function(response) {
+            if (!GeneralFunctions.handleAjaxExceptions(response)) return;
+
+            Backend.displayNotification(EALang['customer_saved']);
+            this.resetForm();
+            $('#filter-customers .key').val('');
+            this.filter('', response.id, true);
+        }.bind(this), 'json').fail(GeneralFunctions.ajaxFailureHandler);
+    };
+
+    /**
+     * Delete a customer record from database.
+     *
+     * @param {numeric} id Record id to be deleted.
+     */
+    CustomersHelper.prototype.delete = function(id) {
+        var postUrl = GlobalVariables.baseUrl + '/index.php/backend_api/ajax_delete_customer',
+            postData = {
+                'csrfToken': GlobalVariables.csrfToken,
+                'customer_id': id
+            };
+
+        $.post(postUrl, postData, function(response) {
+            if (!GeneralFunctions.handleAjaxExceptions(response)) return;
+
+            Backend.displayNotification(EALang['customer_deleted']);
+            this.resetForm();
+            this.filter($('#filter-customers .key').val());
+        }.bind(this), 'json').fail(GeneralFunctions.ajaxFailureHandler);
+    };
+
+    /**
+     * Validate customer data before save (insert or update).
+     *
+     * @param {object} customer Contains the customer data.
+     */
+    CustomersHelper.prototype.validate = function(customer) {
+        $('#form-message').hide();
+        $('.required').css('border', '');
+
+        try {
+            // Validate required fields.
+            var missingRequired = false;
+
+            $('.required').each(function() {
+                if ($(this).val() == '') {
+                    $(this).css('border', '2px solid red');
+                    missingRequired = true;
+                }
+            });
+
+            if (missingRequired) {
+                throw EALang['fields_are_required'];
+            }
+
+            // Validate email address.
+            if (!GeneralFunctions.validateEmail($('#email').val())) {
+                $('#email').css('border', '2px solid red');
+                throw EALang['invalid_email'];
+            }
+
+            return true;
+
+        } catch(exc) {
+            $('#form-message').text(exc).show();
+            return false;
+        }
+    };
+
+    /**
+     * Bring the customer form back to its initial state.
+     */
+    CustomersHelper.prototype.resetForm = function() {
+        $('.details').find('input, textarea').val('');
+        $('.details').find('input, textarea').prop('readonly', true);
+
+        $('#customer-appointments').html('');
+        $('#appointment-details').html('');
+        $('#edit-customer, #delete-customer').prop('disabled', true);
+        $('#add-edit-delete-group').show();
+        $('#save-cancel-group').hide();
+
+        $('.details .required').css('border', '');
+        $('.details #form-message').hide();
+
+        $('#filter-customers button').prop('disabled', false);
+        $('#filter-customers .selected-row').removeClass('selected-row');
+        $('#filter-customers .results').css('color', '');
+    };
+
+    /**
+     * Display a customer record into the form.
+     *
+     * @param {object} customer Contains the customer record data.
+     */
+    CustomersHelper.prototype.display = function(customer) {
+        $('#customer-id').val(customer.id);
+        $('#first-name').val(customer.first_name);
+        $('#last-name').val(customer.last_name);
+        $('#email').val(customer.email);
+        $('#phone-number').val(customer.phone_number);
+        $('#address').val(customer.address);
+        $('#city').val(customer.city);
+        $('#zip-code').val(customer.zip_code);
+        $('#notes').val(customer.notes);
+
+        $('#customer-appointments').data('jsp').destroy();
+        $('#customer-appointments').empty();
+        $.each(customer.appointments, function(index, appointment) {
+            var start = GeneralFunctions.formatDate(Date.parse(appointment.start_datetime), GlobalVariables.dateFormat, true),
+                end = GeneralFunctions.formatDate(Date.parse(appointment.end_datetime), GlobalVariables.dateFormat, true);
+            var html =
+                    '<div class="appointment-row" data-id="' + appointment.id + '">' +
+                        start + ' - ' + end + '<br>' +
+                        appointment.service.name + ', ' +
+                        appointment.provider.first_name + ' ' + appointment.provider.last_name +
+                    '</div>';
+            $('#customer-appointments').append(html);
+        });
+        $('#customer-appointments').jScrollPane({ mouseWheelSpeed: 70 });
+
+        $('#appointment-details').empty();
+    };
+
+    /**
+     * Filter customer records.
+     *
+     * @param {string} key This key string is used to filter the customer records.
+     * @param {numeric} selectId (OPTIONAL = undefined) If set then after the filter
+     * operation the record with the given id will be selected (but not displayed).
+     * @param {bool} display (OPTIONAL = false) If true then the selected record will
+     * be displayed on the form.
+     */
+    CustomersHelper.prototype.filter = function(key, selectId, display) {
+
+        display = display || false;
+
+        var postUrl = GlobalVariables.baseUrl + '/index.php/backend_api/ajax_filter_customers',
+            postData = {
+                'csrfToken': GlobalVariables.csrfToken,
+                'key': key
+            };
+
+        $.post(postUrl, postData, function(response) {
+            if (!GeneralFunctions.handleAjaxExceptions(response)) return;
+
+            this.filterResults = response;
+
+            $('#filter-customers .results').data('jsp').destroy();
+            $('#filter-customers .results').html('');
+            $.each(response, function(index, customer) {
+               var html = this.getFilterHtml(customer);
+               $('#filter-customers .results').append(html);
+           }.bind(this));
+            $('#filter-customers .results').jScrollPane({ mouseWheelSpeed: 70 });
+
+            if (response.length == 0) {
+                $('#filter-customers .results').html('<em>' + EALang['no_records_found'] + '</em>');
+            }
+
+            if (selectId != undefined) {
+                this.select(selectId, display);
+            }
+
+        }.bind(this), 'json').fail(GeneralFunctions.ajaxFailureHandler);
+    };
+
+    /**
+     * Get the filter results row html code.
+     *
+     * @param {object} customer Contains the customer data.
+     * @return {string} Returns the record html code.
+     */
+    CustomersHelper.prototype.getFilterHtml = function(customer) {
+        var name = customer.first_name + ' ' + customer.last_name;
+        var info = customer.email;
+        info = (customer.phone_number != '' && customer.phone_number != null)
+                ? info + ', ' + customer.phone_number : info;
+
+        var html =
+                '<div class="customer-row" data-id="' + customer.id + '">' +
+                    '<strong>' +
+                        name +
+                    '</strong><br>' +
+                    info +
+                '</div><hr>';
+
+        return html;
+    };
+
+    /**
+     * Select a specific record from the current filter results. If the customer id does not exist
+     * in the list then no record will be selected.
+     *
+     * @param {numeric} id The record id to be selected from the filter results.
+     * @param {bool} display (OPTIONAL = false) If true then the method will display the record
+     * on the form.
+     */
+    CustomersHelper.prototype.select = function(id, display) {
+        display = display || false
+
+        $('#filter-customers .selected-row').removeClass('selected-row');
+
+        $('#filter-customers .customer-row').each(function() {
+            if ($(this).attr('data-id') == id) {
+                $(this).addClass('selected-row');
+                return false;
+            }
+        });
+
+        if (display) {
+            $.each(this.filterResults, function(index, customer) {
+                if (customer.id == id) {
+                    this.display(customer);
+                    $('#edit-customer, #delete-customer').prop('disabled', false);
+                    return false;
+                }
+            }.bind(this));
+        }
+    };
+
+    /**
+     * Display appointment details on customers backend page.
+     *
+     * @param {object} appointment Appointment data
+     */
+    CustomersHelper.prototype.displayAppointment = function(appointment) {
+        var start = GeneralFunctions.formatDate(Date.parse(appointment.start_datetime), GlobalVariables.dateFormat, true),
+            end = GeneralFunctions.formatDate(Date.parse(appointment.end_datetime), GlobalVariables.dateFormat, true);
+
+        var html =
+                '<div>' +
+                    '<strong>' + appointment.service.name + '</strong><br>' +
+                    appointment.provider.first_name + ' ' + appointment.provider.last_name + '<br>' +
+                    start + ' - ' + end + '<br>' +
+                '</div>';
+
+        $('#appointment-details').html(html);
+    };
+
+    window.CustomersHelper = CustomersHelper;
+})();