Enable/ disable „Display author and date information“ per node?

Question

It is passible to enable or disable the „Display author and date information“ for each node depending on the content of a field?

The base:

• Drupal 8.3.0 (rc2)

• field „Where to publish“

---

• Case 1: field „Where to publish“ = „public“
• Case 2: field „Where to publish“ = „internally“

-> in Case 1: disable „Display author and date information“

-> in Case 2: enable „Display author and date information“

How can this be realized? Is that possible? Or should I use two different content types?

---

First part runs:

function kanu_preprocess_node(&$variables) {
if ($variables['node']->getType() != 'test') {
    return;
  }
$field = $variables['node']->field_where_to_publish;
}

Completed it returns an unexpected error:

function kanu_preprocess_node(&$variables) {
  if ($variables['node']->getType() != 'test') {
      return;
  }
  $field = $variables['node']->field_where_to_publish;

  if (!field->isEmpty() && $field->entity->label() == 'public') {
     $variables['display_submitted'] = FALSE;
  }
}

Answer 1

You can override the variable display_submitted in a preprocess hook:

mytheme.theme:

function mytheme_preprocess_node(&$variables) {

  // check if this is the right content type where the field exists
  if ($variables['node']->getType() != 'article') {
    return;
  }

  // plain field
  if ($variables['node']->field_where_to_publish->value == 'public') {
    $variables['display_submitted'] = FALSE;
  }

  // taxonomy field
  $field = $variables['node']->field_where_to_publish;
  if (!$field->isEmpty() && $field->entity->label() == 'public') {
    $variables['display_submitted'] = FALSE;
  }

}