Handle webforms with pages

modules/bee_webform/bee_webform.module

@@ -12,7 +12,7 @@ use Drupal\node\Entity\Node;
 function bee_webform_form_alter(&$form, FormStateInterface $form_state, $form_id) {
   if (isset($form['#webform_id'])) {
     $webform = \Drupal\webform\Entity\Webform::load($form['#webform_id']);
-    foreach ($webform->getElementsDecodedAndFlattened() as $element) {
+    foreach ($webform->getElementsDecodedAndFlattened() as $element_id => $element) {
       if ($element['#type'] == 'webform_bee_reservation_form') {
         $form['actions']['submit']['#submit'][] = 'bee_webform_form_submit';
       }
@@ -20,11 +20,18 @@ function bee_webform_form_alter(&$form, FormStateInterface $form_state, $form_id
   }
 }
 
+/**
+ * bee_webform submission handler.
+ */
 function bee_webform_form_submit($form, FormStateInterface $form_state) {
-  foreach ($form['elements'] as $id => $element) {
-    if ($element['#type'] == 'webform_bee_reservation_form') {
-      $value = $form_state->getValue($id);
   $webform = \Drupal\webform\Entity\Webform::load($form['#webform_id']);
+  foreach ($webform->getElementsDecodedAndFlattened() as $element_id => $element) {
+    if ($element['#type'] == 'webform_bee_reservation_form') {
+      $bee_element_id = $element_id;
+    }
+  }
+
+  $value = $form_state->getValue($bee_element_id);
 
   if ($value['content_type'] && $value['start_date'] && $value['end_date'] && $value['capacity']) {
     $webform_submission = $form_state->getFormObject()->getEntity();
@@ -153,8 +160,6 @@ function bee_webform_form_submit($form, FormStateInterface $form_state) {
     drupal_set_message($message);
     \Drupal::logger('bee_webform')->notice($message);
   }
-    }
-  }
 }
 
 /**