I have a config entity form that has a taxonomy field, and it currently works with 1 term
$form['integration'] = array( '#type' => 'entity_autocomplete', '#title' => 'Integration', '#required' => TRUE, '#target_type' => 'taxonomy_term', '#default_value' => $entity->getIntegration(), '#selection_settings' => array( 'target_bundles' => array( 'integration', ), ), );
That works fine, but I need to be able to select multiple terms, I've tried setting
'#cardinality' => -1, but it's only allowing 1 element. I added a taxonomy field with unlimited cardinality to a content type, then set a breakpoint on the form to see how it was being set up for the page rendering. It looks like it creates a
container form element, then I assume iterates over an array containing all the terms?
I would have thought there would be a way to set the cardinality of an element by making use of field widgets on the config form page, but I'm not sure that's possible.