Change View head title programmatically

Question

I have a view of taxonomy terms with exposed filter. Main view page: site.com/view

I have a text field with 16 different values and urls:

• site.com/view/1
• site.com/view/2
• site.com/view/...
• site.com/view/16

Depending on passed argument I change View title like this:

use \Drupal\views\ViewExecutable;
function theme_views_pre_render(ViewExecutable $view) 
{
  
  if( $view->id() == 'MY_VIEW_ID' && $view->current_display === 'VIEW_DISPLAY' && $view->args[0] != 'All')
  {
    $view->setTitle(gamesGenreTitle($view->args[0]));
  }
}

function gamesGenreTitle($val)
{
  $options = options_allowed_values(\Drupal::service('entity_field.manager')->getFieldStorageDefinitions('taxonomy_term')['field_genre']);
  return $options[$val];
}

gamesGenreTitle() is getting labels of my field in order to put them to the title.

It works, but it is not changing the head <title> tag!

I've tried theme_preprocess_html(&$variables) with this code:

  $view_id = \Drupal::routeMatch()->getParameter('view_id');

  $view = \Drupal\views\Views::getView($view_id);

But it only gets the view id and I can't access args there in order to change title on only needed pages.

My second guess, which I haven't tried yet, is to validate and explode to array current path, using \Drupal::service('path.current')->getPath();, get the last digit and pass it to gamesGenreTitle().

Or maybe there is better way?

Answer 1

Don't necessarily need to access the view object ($view) to get the arguments. You can check all arguments by doing so

$params = Drupal::routeMatch()->getParameters();

Usually you'll find that if you are accesing a view with contextual filters/parameters there will be "arg_0, arg_1" parameter keys

var_dump($params);
// object(Symfony\Component\HttpFoundation\ParameterBag)#323 (1) { ["parameters":protected]=> array(4) { ["view_id"]=> string(18) "sample_view" ["display_id"]=> string(6) "page_1" ["arg_0"]=> string(26) "251" } }

Then you can do

$params = Drupal::routeMatch()->getParameter('arg_0');