iflrandevu/application/views/backend/calendar.php

<link rel="stylesheet" type="text/css" href="<?= asset_url('/assets/ext/jquery-fullcalendar/fullcalendar.min.css') ?>">

<script src="<?= asset_url('assets/ext/moment/moment.min.js') ?>"></script>
<script src="<?= asset_url('assets/ext/jquery-fullcalendar/fullcalendar.min.js') ?>"></script>
<script src="<?= asset_url('assets/ext/jquery-ui/jquery-ui-timepicker-addon.min.js') ?>"></script>
<script src="<?= asset_url('assets/js/backend_calendar.js') ?>"></script>
<script src="<?= asset_url('assets/js/backend_calendar_default_view.js') ?>"></script>
<script src="<?= asset_url('assets/js/backend_calendar_table_view.js') ?>"></script>
<script src="<?= asset_url('assets/js/backend_calendar_google_sync.js') ?>"></script>
<script src="<?= asset_url('assets/js/backend_calendar_appointments_modal.js') ?>"></script>
<script src="<?= asset_url('assets/js/backend_calendar_unavailabilities_modal.js') ?>"></script>
<script src="<?= asset_url('assets/js/backend_calendar_extra_periods_modal.js') ?>"></script>
<script src="<?= asset_url('assets/js/backend_calendar_api.js') ?>"></script>
<script>
    var GlobalVariables = {
        'csrfToken': <?= json_encode($this->security->get_csrf_hash()) ?>,
        'availableProviders': <?= json_encode($available_providers) ?>,
        'availableServices': <?= json_encode($available_services) ?>,
        'baseUrl': <?= json_encode($base_url) ?>,
        'bookAdvanceTimeout': <?= $book_advance_timeout ?>,
        'dateFormat': <?= json_encode($date_format) ?>,
        'timeFormat': <?= json_encode($time_format) ?>,
        'firstWeekday': <?= json_encode($first_weekday) ?>,
        'editAppointment': <?= json_encode($edit_appointment) ?>,
        'customers': <?= json_encode($customers) ?>,
        'secretaryProviders': <?= json_encode($secretary_providers) ?>,
        'calendarView': <?= json_encode($calendar_view) ?>,
        'timezones': <?= json_encode($timezones) ?>,
        'user': {
            'id': <?= $user_id ?>,
            'email': <?= json_encode($user_email) ?>,
            'timezone': <?= json_encode($timezone) ?>,
            'role_slug': <?= json_encode($role_slug) ?>,
            'privileges': <?= json_encode($privileges) ?>,
        }
    };

    $(document).ready(function () {
        BackendCalendar.initialize(GlobalVariables.calendarView);
    });
</script>

<div id="calendar-page" class="container-fluid">
    <div id="calendar-toolbar">
        <div id="calendar-filter" class="col-12 col-md-5">
            <div class="form-group calendar-filter-items">
                <label for="select-filter-item" class="mr-3"><?= lang('display_calendar') ?></label>
                <select id="select-filter-item" class="form-control col" title="<?= lang('select_filter_item_hint') ?>">
                </select>
            </div>
        </div>

        <div id="calendar-actions" class="col-12 col-md-7">
            <?php if (($role_slug == DB_SLUG_ADMIN || $role_slug == DB_SLUG_PROVIDER)
                && config('google_sync_feature') == TRUE): ?>
                <button id="google-sync" class="btn btn-primary"
                        title="<?= lang('trigger_google_sync_hint') ?>">
                    <i class="fas fa-sync-alt"></i>
                    <span><?= lang('synchronize') ?></span>
                </button>

                <button id="enable-sync" class="btn btn-light" data-toggle="button"
                        title="<?= lang('enable_appointment_sync_hint') ?>">
                    <i class="far fa-calendar-alt"></i>
                    <span><?= lang('enable_sync') ?></span>
                </button>
            <?php endif ?>

            <?php if ($privileges[PRIV_APPOINTMENTS]['add'] == TRUE): ?>
            <div class="btn-group">
                <button class="btn btn-light" id="insert-appointment">
                    <i class="fas fa-plus"></i>
                    <?= lang('appointment') ?>
                </button>

                <button class="btn btn-light dropdown-toggle" id="insert-dropdown" data-toggle="dropdown">
                    <span class="caret"></span>
                    <span class="sr-only">Toggle Dropdown</span>
                </button>

                <div class="dropdown-menu">
                    <a class="dropdown-item" href="#" id="insert-unavailable">
                        <?= lang('unavailable') ?>
                    </a>
                    <a class="dropdown-item" href="#" id="insert-extra-period">
                        <?= lang('extra_period') ?>
                    </a>
                </div>
            </div>
            <?php endif ?>

            <button id="reload-appointments" class="btn btn-light" title="<?= lang('reload_appointments_hint') ?>">
                <i class="fas fa-redo-alt"></i>
            </button>

            <?php if($calendar_view === 'default'): ?>
                <a class="btn btn-light" href="<?= site_url('backend?view=table') ?>"
                   title="<?= lang('table') ?>">
                    <i class="far fa-list-alt"></i>
                </a>
            <?php endif ?>

            <?php if($calendar_view === 'table'): ?>
                <a class="btn btn-light" href="<?= site_url('backend?view=default') ?>"
                   title="<?= lang('default') ?>">
                    <i class="fas fa-calendar-alt"></i>
                </a>
            <?php endif ?>
        </div>
    </div>

    <div id="calendar"><!-- Dynamically Generated Content --></div>
</div>


<!-- MANAGE APPOINTMENT MODAL -->

<div id="manage-appointment" class="modal fade" data-keyboard="true" tabindex="-1">
    <div class="modal-dialog modal-lg">
        <div class="modal-content">
            <div class="modal-header">
                <h3 class="modal-title"><?= lang('edit_appointment_title') ?></h3>
                <button class="close" data-dismiss="modal" aria-hidden="true">&times;</button>
            </div>

            <div class="modal-body">
                <div class="modal-message alert d-none"></div>

                <form>
                    <fieldset>
                        <legend><?= lang('appointment_details_title') ?></legend>

                        <input id="appointment-id" type="hidden">

                        <div class="row">
                            <div class="col-12 col-sm-6">
                                <div class="form-group">
                                    <label for="select-service" class="control-label"><?= lang('service') ?> *</label>
                                    <select id="select-service" class="required form-control">
                                        <?php
                                        // Group services by category, only if there is at least one service
                                        // with a parent category.
                                        $has_category = FALSE;
                                        foreach ($available_services as $service)
                                        {
                                            if ($service['category_id'] != NULL)
                                            {
                                                $has_category = TRUE;
                                                break;
                                            }
                                        }

                                        if ($has_category)
                                        {
                                            $grouped_services = [];

                                            foreach ($available_services as $service)
                                            {
                                                if ($service['category_id'] != NULL)
                                                {
                                                    if ( ! isset($grouped_services[$service['category_name']]))
                                                    {
                                                        $grouped_services[$service['category_name']] = [];
                                                    }

                                                    $grouped_services[$service['category_name']][] = $service;
                                                }
                                            }

                                            // We need the uncategorized services at the end of the list so we will use
                                            // another iteration only for the uncategorized services.
                                            $grouped_services['uncategorized'] = [];
                                            foreach ($available_services as $service)
                                            {
                                                if ($service['category_id'] == NULL)
                                                {
                                                    $grouped_services['uncategorized'][] = $service;
                                                }
                                            }

                                            foreach ($grouped_services as $key => $group)
                                            {
                                                $group_label = ($key != 'uncategorized')
                                                    ? $group[0]['category_name'] : 'Uncategorized';

                                                if (count($group) > 0)
                                                {
                                                    echo '<optgroup label="' . $group_label . '">';
                                                    foreach ($group as $service)
                                                    {
                                                        echo '<option value="' . $service['id'] . '">'
                                                            . $service['name'] . '</option>';
                                                    }
                                                    echo '</optgroup>';
                                                }
                                            }
                                        }
                                        else
                                        {
                                            foreach ($available_services as $service)
                                            {
                                                echo '<option value="' . $service['id'] . '">'
                                                    . $service['name'] . '</option>';
                                            }
                                        }
                                        ?>
                                    </select>
                                </div>

                                <div class="form-group">
                                    <label for="select-provider" class="control-label"><?= lang('provider') ?> *</label>
                                    <select id="select-provider" class="required form-control"></select>
                                </div>

                                <div class="form-group">
                                    <label for="appointment-location"
                                           class="control-label"><?= lang('location') ?></label>
                                    <input id="appointment-location" class="form-control">
                                </div>

                                <div class="form-group">
                                    <label for="appointment-notes" class="control-label"><?= lang('notes') ?></label>
                                    <textarea id="appointment-notes" class="form-control" rows="3"></textarea>
                                </div>
                            </div>

                            <div class="col-12 col-sm-6">
                                <div class="form-group">
                                    <label for="start-datetime"
                                           class="control-label"><?= lang('start_date_time') ?></label>
                                    <input id="start-datetime" class="required form-control">
                                </div>

                                <div class="form-group">
                                    <label for="end-datetime" class="control-label"><?= lang('end_date_time') ?></label>
                                    <input id="end-datetime" class="required form-control">
                                </div>

                                <div class="form-group">
                                    <label class="control-label"><?= lang('timezone') ?></label>

                                    <ul>
                                        <li>
                                            <?= lang('provider') ?>:
                                            <span class="provider-timezone">
                                                -
                                            </span>
                                        </li>
                                        <li>
                                            <?= lang('current_user') ?>:
                                            <span>
                                                <?= $timezones[$timezone] ?>
                                            </span>
                                        </li>
                                    </ul>
                                </div>
                            </div>
                        </div>
                    </fieldset>

                    <br>

                    <fieldset>
                        <legend>
                            <?= lang('customer_details_title') ?>
                            <button id="new-customer" class="btn btn-light btn-sm" type="button"
                                    title="<?= lang('clear_fields_add_existing_customer_hint') ?>">
                                <?= lang('new') ?>
                            </button>
                            <button id="select-customer" class="btn btn-primary btn-sm" type="button"
                                    title="<?= lang('pick_existing_customer_hint') ?>">
                                <?= lang('select') ?>
                            </button>
                            <input id="filter-existing-customers"
                                   placeholder="<?= lang('type_to_filter_customers') ?>"
                                   style="display: none;" class="input-sm form-control">
                            <div id="existing-customers-list" style="display: none;"></div>
                        </legend>

                        <input id="customer-id" type="hidden">

                        <div class="row">
                            <div class="col-12 col-sm-6">
                                <div class="form-group">
                                    <label for="first-name" class="control-label"><?= lang('first_name') ?> *</label>
                                    <input id="first-name" class="required form-control">
                                </div>

                                <div class="form-group">
                                    <label for="last-name" class="control-label"><?= lang('last_name') ?> *</label>
                                    <input id="last-name" class="required form-control">
                                </div>

                                <div class="form-group">
                                    <label for="email" class="control-label"><?= lang('email') ?> *</label>
                                    <input id="email" class="required form-control">
                                </div>

                                <div class="form-group">
                                    <label for="phone-number" class="control-label"><?= lang('phone_number') ?>
                                        *</label>
                                    <input id="phone-number" class="required form-control">
                                </div>
                            </div>
                            <div class="col-12 col-sm-6">
                                <div class="form-group">
                                    <label for="address" class="control-label"><?= lang('address') ?></label>
                                    <input id="address" class="form-control">
                                </div>

                                <div class="form-group">
                                    <label for="city" class="control-label"><?= lang('city') ?></label>
                                    <input id="city" class="form-control">
                                </div>

                                <div class="form-group">
                                    <label for="zip-code" class="control-label"><?= lang('zip_code') ?></label>
                                    <input id="zip-code" class="form-control">
                                </div>

                                <div class="form-group">
                                    <label for="customer-notes" class="control-label"><?= lang('notes') ?></label>
                                    <textarea id="customer-notes" rows="2" class="form-control"></textarea>
                                </div>
                            </div>
                        </div>
                    </fieldset>
                </form>
            </div>

            <div class="modal-footer">
                <button id="save-appointment" class="btn btn-primary"><?= lang('save') ?></button>
                <button id="cancel-appointment" class="btn btn-light"
                        data-dismiss="modal"><?= lang('cancel') ?></button>
            </div>
        </div>
    </div>
</div>

<!-- MANAGE UNAVAILABLE MODAL -->

<div id="manage-unavailable" class="modal fade">
    <div class="modal-dialog">
        <div class="modal-content">
            <div class="modal-header">
                <h3 class="modal-title"><?= lang('new_unavailable_title') ?></h3>
                <button class="close" data-dismiss="modal" aria-hidden="true">&times;</button>
            </div>
            <div class="modal-body">
                <div class="modal-message alert d-none"></div>

                <form>
                    <fieldset>
                        <input id="unavailable-id" type="hidden">

                        <div class="form-group">
                            <label for="unavailable-provider" class="control-label"><?= lang('provider') ?></label>
                            <select id="unavailable-provider" class="form-control"></select>
                        </div>

                        <div class="form-group">
                            <label for="unavailable-start" class="control-label"><?= lang('start') ?></label>
                            <input id="unavailable-start" class="form-control">
                        </div>

                        <div class="form-group">
                            <label for="unavailable-end" class="control-label"><?= lang('end') ?></label>
                            <input id="unavailable-end" class="form-control">
                        </div>

                        <div class="form-group">
                            <label class="control-label"><?= lang('timezone') ?></label>

                            <ul>
                                <li>
                                    <?= lang('provider') ?>:
                                    <span class="provider-timezone">
                                        -
                                    </span>
                                </li>
                                <li>
                                    <?= lang('current_user') ?>:
                                    <span>
                                        <?= $timezones[$timezone] ?>
                                    </span>
                                </li>
                            </ul>
                        </div>

                        <div class="form-group">
                            <label for="unavailable-notes" class="control-label"><?= lang('notes') ?></label>
                            <textarea id="unavailable-notes" rows="3" class="form-control"></textarea>
                        </div>
                    </fieldset>
                </form>
            </div>
            <div class="modal-footer">
                <button id="save-unavailable" class="btn btn-primary"><?= lang('save') ?></button>
                <button id="cancel-unavailable" class="btn btn-light"
                        data-dismiss="modal"><?= lang('cancel') ?></button>
            </div>
        </div>
    </div>
</div>

<!-- MANAGE EXTRA PERIOD MODAL -->

<div id="manage-extra" class="modal fade">
    <div class="modal-dialog">
        <div class="modal-content">
            <div class="modal-header">
                <h3 class="modal-title"><?= lang('new_extra_period_title') ?></h3>
                <button class="close" data-dismiss="modal" aria-hidden="true">&times;</button>
            </div>
            <div class="modal-body">
                <div class="modal-message alert d-none"></div>

                <form>
                    <fieldset>
                        <input id="extra-id" type="hidden">

                        <div class="form-group">
                            <label for="extra-provider" class="control-label"><?= lang('provider') ?></label>
                            <select id="extra-provider" class="form-control"></select>
                        </div>

                        <div class="form-group">
                            <label for="extra-start" class="control-label"><?= lang('start') ?></label>
                            <input id="extra-start" class="form-control">
                        </div>

                        <div class="form-group">
                            <label for="extra-end" class="control-label"><?= lang('end') ?></label>
                            <input id="extra-end" class="form-control">
                        </div>

                        <div class="form-group">
                            <label class="control-label"><?= lang('timezone') ?></label>

                            <ul>
                                <li>
                                    <?= lang('provider') ?>:
                                    <span class="provider-timezone">
                                        -
                                    </span>
                                </li>
                                <li>
                                    <?= lang('current_user') ?>:
                                    <span>
                                        <?= $timezones[$timezone] ?>
                                    </span>
                                </li>
                            </ul>
                        </div>
                    </fieldset>
                </form>
            </div>
            <div class="modal-footer">
                <button id="save-extra" class="btn btn-primary"><?= lang('save') ?></button>
                <button id="cancel-extra" class="btn btn-light" data-dismiss="modal"><?= lang('cancel') ?></button>
            </div>
        </div>
    </div>
</div>

<!-- SELECT GOOGLE CALENDAR MODAL -->

<div id="select-google-calendar" class="modal fade">
    <div class="modal-dialog">
        <div class="modal-content">
            <div class="modal-header">
                <button class="close" data-dismiss="modal" aria-hidden="true">&times;</button>
                <h3 class="modal-title"><?= lang('select_google_calendar') ?></h3>
            </div>
            <div class="modal-body">
                <div class="form-group">
                    <label for="google-calendar"
                           class="control-label"><?= lang('select_google_calendar_prompt') ?></label>
                    <select id="google-calendar" class="form-control"></select>
                </div>
            </div>
            <div class="modal-footer">
                <button id="select-calendar" class="btn btn-primary"><?= lang('select') ?></button>
                <button id="close-calendar" class="btn btn-light" data-dismiss="modal"><?= lang('close') ?></button>
            </div>
        </div>
    </div>
</div>