What is the template file for node add/edit page?

Question

I need to add extra CSS styles for a set of fields in the node add page for the jobs content type, but I don't know what template file should I use. I enabled Twig debugging, and I tried the following options.

• page--node--add--jobs.html.twig, but it shows all regions

• hook_theme(), but the custom template is not getting applied

My code for hook_theme() is the following.

 function custom_module_theme() {
  //  dpm("node:".drupal_get_path('module', 'comp_jobs'));  
  return [
    'node-jobs-form' => [
      'render element' => 'form',
      'template' => 'jobs',
      'path' => drupal_get_path('module', 'comp_jobs') . '/templates',
    ],
  ];
}

What template file should I use, and how do I tell Drupal to use that?

Answer 1

The template for the node add form is node-edit-form.html.twig. But adding attributes to form fields is not an easy task in twig. You probably are able to do this more efficient in a form alter hook.