function bat_options_remove_submit in Booking and Availability Management Tools for Drupal 7

Submit callback to remove an item from the field UI multiple wrapper.

When a remove button is submitted, we need to find the item that it referenced and delete it. Since field UI has the deltas as a straight unbroken array key, we have to renumber everything down. Since we do this we *also* need to move all the deltas around in the $form_state['values'], $form_state['input'], and $form_state['field'] so that user changed values follow. This is a bit of a complicated process.

1 string reference to 'bat_options_remove_submit'

bat_options_field_widget_form in modules/bat_options/bat_options.module

Implements hook_field_widget_form().

File

modules/bat_options/bat_options.module, line 386

Code

function bat_options_remove_submit($form, &$form_state) {
  $button = $form_state['triggering_element'];
  $delta = $button['#delta'];

  // Where in the form we'll find the parent element.
  $address = array_slice($button['#array_parents'], 0, -2);

  // Go one level up in the form, to the widgets container.
  $parent_element = drupal_array_get_nested_value($form, $address);
  $field_name = $parent_element['#field_name'];
  $langcode = $parent_element['#language'];
  $parents = $parent_element['#field_parents'];
  $field_state = field_form_get_state($parents, $field_name, $langcode, $form_state);

  // Go ahead and renumber everything from our delta to the last
  // item down one. This will overwrite the item being removed.
  for ($i = $delta; $i <= $field_state['items_count']; $i++) {
    $old_element_address = array_merge($address, array(
      $i + 1,
    ));
    $new_element_address = array_merge($address, array(
      $i,
    ));
    $moving_element = drupal_array_get_nested_value($form, $old_element_address);
    $moving_element_value = drupal_array_get_nested_value($form_state['values'], $old_element_address);
    $moving_element_input = drupal_array_get_nested_value($form_state['input'], $old_element_address);
    $moving_element_field = drupal_array_get_nested_value($form_state['field'], $old_element_address);

    // Tell the element where it's being moved to.
    $moving_element['#parents'] = $new_element_address;

    // Move the element around.
    form_set_value($moving_element, $moving_element_value, $form_state);
    drupal_array_set_nested_value($form_state['input'], $moving_element['#parents'], $moving_element_input);
    drupal_array_set_nested_value($form_state['field'], $moving_element['#parents'], $moving_element_field);
  }

  // Then remove the last item. But we must not go negative.
  if ($field_state['items_count'] > 0) {
    $field_state['items_count']--;
  }

  // Fix the weights. Field UI lets the weights be in a range of
  // (-1 * item_count) to (item_count). This means that when we remove one,
  // the range shrinks; weights outside of that range then get set to
  // the first item in the select by the browser, floating them to the top.
  // We use a brute force method because we lost weights on both ends
  // and if the user has moved things around, we have to cascade because
  // if I have items weight weights 3 and 4, and I change 4 to 3 but leave
  // the 3, the order of the two 3s now is undefined and may not match what
  // the user had selected.
  $input = drupal_array_get_nested_value($form_state['input'], $address);

  // Sort by weight.
  uasort($input, '_field_sort_items_helper');

  // Reweight everything in the correct order.
  $weight = -1 * $field_state['items_count'];
  foreach ($input as $key => $item) {
    if ($item) {
      $input[$key]['_weight'] = $weight++;
    }
  }
  drupal_array_set_nested_value($form_state['input'], $address, $input);
  field_form_set_state($parents, $field_name, $langcode, $form_state, $field_state);
  $form_state['rebuild'] = TRUE;
}