2
It turns out the code above was working fine -- the problem was that the site was using a Bootstrap subtheme, and Bootstrap was configured to override the standard dialog behavior. Turning off Bootstrap's dialogs solved the problem, enabling both width and title settings.
1
I doubt that the array you've found really assigns 2 callbacks. It's rather an array defining a class and a method for a single callback:
'callback' => ['Drupal\foo\BarClass', 'ajaxCallback']
In fact, you can only set one callback in an #ajax element. If you want to override a callback you have to include the overridden callback in your code:
Drupal\foo\...
1
This works for me:
$element = NULL;
if (!empty($triggering_element['#ajax']['element'])) {
$element = \Drupal\Component\Utility\NestedArray::getValue($form, $triggering_element['#ajax']['element']);
}
// Element not specified or not found. Show messages on top of the form.
if (!$element) {
$element = $form;
}
$response = new AjaxResponse();
$response->...
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