How do I pass arguments from URL into panel page block?

Question

I have created a view with a contextual filter set to a taxonomy term. I am attempting to use the view block in a panels (page manager) page and pass the taxonomy term from the URL into the block. I could do this in Drupal 7 but I can't seem to figure it out in D8.

The page URL will be something like /reports/term1. I would like to pass term1 into the block.

For the panel page I have a URL like /reports/! (I also tried % as the place holder). Though I have seen some recommendations to use a context to pass the term, I have not been able to do so.

I am working with Drupal 8.7.1, Panels 8.x-4.4, Page Manager 8.4-4.0.

Any suggestions on how to accomplish this?

Answer 1

I have not used Panels with D8, but...

With D7 Panels I remember there was a way to set/pass a contextual filter value, but one thing I noticed was if I did not set it in Panels and instead set it directly in the View's settings, it also worked.

So all you have to do is edit your View block, under Advanced, for contextual filters add Has taxonomy term ID

In the settings for that, select Provide default value and for type use Taxonomy term ID from URL

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Alternatively, you could do

Answer 2

This answer doesn't have anything to do with panels, but it will work for generally setting $args (contextual filter values) for views.

function hook_views_pre_view(\Drupal\views\ViewExecutable $view, $display_id, array &$args) {

  // You'll likely be able to get your term ID from the current route and/or the current path

  $route = \Drupal::routeMatch(); // get the current route
  $params = $route->getParameters(); // get the names of any parameters on the route
  $your_param_val = $route->getParameter('your_param'); // gets the value of a param, given that it exists in $params

  $current_path = \Drupal::service('path.current')->getPath(); //gets the current path
  $path_components = explode('/', $current_path); // gives you an array of the path components

  switch ($view->id()) {
    case 'your_view_id': // the machine name of your view
      if ($display_id === 'block_1') { // the machine name for your display

        $args[0] = $tid; // will set the value of the first contextual filter to the value of $tid;
        $args[1] = $another_fun_value; // will set the value of the second contextual filter, etc
        break;
      }
  }
}

Then the settings for the Contextual Filter (show all results, hide view, view) will be used as the fallback if the above code doesn't set the value of the filter for whatever reason.

Answer 3

Finally figured out how to get this to work. The missing element was the correct way to add a placeholder to the path in D8 page manager and panels. The path needs to be something like /something/{args}. ! or % does not appear to work.

Then I added a page manager context (under the Variants section) of the data type "string". When adding this context I set the context value to "string."

In the view, I added a taxonomy term relationship and selected (within the relationship) the intended vocabulary. Then I added a contextual filter of the type Taxonomy term: name. Note, you must enter "name" in the contextual filter search box to find the correct filter.

Then I selected "Raw value from the URL", and in this case, path component 2. I also added a validator of "Taxonomy term name" to the view contextual filter.