将结果显示在与Codeigniter中表单相同的页面上，未定义变量

Question

我正在通过预订系统来学习codeIgniter。 当结果显示在另一页上时，一切都变了，但是当将其放在同一页上时（这就是我想要的方式），在提交表单后， $rooms_form_options和$packages_form_options变得不确定

<div>
    <?php echo form_label('Conference Room', 'id') ; ?>
    <?php echo form_dropdown('id', $rooms_form_options, set_value('id')); ?>
</div>
<div>
    <?php echo form_label('Package type', 'package_id') ; ?>
    <?php echo form_dropdown('package_id', $packages_form_options, set_value('package_id')); ?>
</div>
<div>
    <?php echo form_label('Antal deltagare', 'number_people') ; ?>
    <?php echo form_input('number_people', set_value('number_people')) ; ?>
</div>

<div>
    <?php echo form_submit('preview', 'Book'); ?>
</div>

<?php echo form_close(); ?>

<?php
if(isset($_POST["preview"])) {
if($messages) {
    echo html_escape($messages);
} else {
?>

<div class="alert alert-success">Number of participants:  <?php echo    html_escape($guests); ?> </div>
<div class="alert alert-success">Room:  <?php echo html_escape($room); ?>   </div>
<div class="alert alert-success">Package:  <?php echo html_escape($package); ?> </div>
<div class="alert alert-success">Price per participant: <?php echo html_escape($price); ?> </div>
<div class="alert alert-success">Total Price: <?php echo html_escape($guests*$price); ?> </div>
<?php } }?>

这是我从以下位置获得$rooms_form_options和$packages_form_options的位置：

    public function index() {

    $this->load->helper('form');
    $this->load->view('bootstrap/header');

    $this->load->model('Booking_Model');
    $rooms = $this->Booking_Model->get();
    $rooms_form_options = array();


    foreach ($rooms as $id => $room) {
        $rooms_form_options[$id] = $room->title;
    }


    $this->load->model('Package_Model');
    $packages = $this->Package_Model->get();
    $packages_form_options = array();

    foreach ($packages as $id => $package) {
        $packages_form_options[$id] = $package->package_name;
    }

    $this->load->view('booking', array(
        'rooms_form_options' => $rooms_form_options,
        'packages_form_options' => $packages_form_options,
    ));


    $this->load->view('bootstrap/footer');

}

我使用称为preview方法来处理表单，这是我返回到预订页面的地方：

    // load view with people, room and package values
    $this->load->view('bootstrap/header');
    $this->load->view('booking', array(
        'guests' => $guests,
        'room' => $room_title,
        'package' => $package_title,
        'alias' => $package_alias,
        'price' => $price,
        'messages' => $messages,

    ));

提交表单后，如何确保定义了$rooms_form_options和$package_form_options ？

Answer 1

创建另一个单独的方法来填充这些变量：

private function get_options() {

    $this->load->model('Booking_Model');
    $rooms = $this->Booking_Model->get();
    $rooms_form_options = array();

    foreach ($rooms as $id => $room) {
        $rooms_form_options[$id] = $room->title;
    }

    $this->load->model('Package_Model');
    $packages = $this->Package_Model->get();
    $packages_form_options = array();

    foreach ($packages as $id => $package) {
        $packages_form_options[$id] = $package->package_name;
    }

    return array(
        'packages_form_options' => $packages_form_options,
        'rooms_form_options' => $rooms_form_options,
    );
}

整体看起来像这样：

public function index() {

    $this->load->helper('form');
    $this->load->view('bootstrap/header');

    $options = $this->get_options();

    $this->load->view('booking', array(
        'guests' => '',
        'room' => '',
        'package' => '',
        'alias' => '',
        'price' => '',
        'messages' => '',
        'rooms_form_options' => $options['packages_form_options'],
        'packages_form_options' => $options['rooms_form_options'],
    ));

    $this->load->view('bootstrap/footer');
}

public function preview() {

    $this->load->helper('form');
    $this->load->view('bootstrap/header');

    $options = $this->get_options();

    $this->load->view('booking', array(
        'guests' => $this->input->post('guests'),
        'room' => $this->input->post('room_title'),
        'package' => $this->input->post('package_title'),
        'alias' => $this->input->post('package_alias'),
        'price' => $this->input->post('price'),
        'messages' => $this->input->post('messages'),
        'rooms_form_options' => $options['packages_form_options'],
        'packages_form_options' => $options['rooms_form_options'],
    ));

    $this->load->view('bootstrap/footer');
}

private function get_options() {

    $this->load->model('Booking_Model');
    $rooms = $this->Booking_Model->get();
    $rooms_form_options = array();

    foreach ($rooms as $id => $room) {
        $rooms_form_options[$id] = $room->title;
    }

    $this->load->model('Package_Model');
    $packages = $this->Package_Model->get();
    $packages_form_options = array();

    foreach ($packages as $id => $package) {
        $packages_form_options[$id] = $package->package_name;
    }

    return array(
        'packages_form_options' => $packages_form_options,
        'rooms_form_options' => $rooms_form_options,
    );
}