Adding the current node title as the value of the comment form title?

Question

I want a value to be automatically added to the title text-field in the comment form ; this value would be indeed the current node title.

I've started working on a hook_form_alter() (added in a custom module already installed and enabled) like this one :

   function ta_module_form_alter(&$form, &$form_state, $form_id) {
   if ($form_id == 'comment-form') {
        $form['comment']['title']['#value'] = 'Blablabla';
    }
   }

But as you might guess it's not working... I've got several issues:

• Is the $form_id the right one ?

• I didn't manage to successfully use print_r($form) (or it returned nothing) so I guessed the path to the title value. Might be incorrect too...

• And finally, I really don't know how to get the current node title variable, so as to attribute it the title value!

Thanks for reading, I hope I've been understandable ! ;)

Answer 1

You're right, you most likely have the $form_id wrong. To check this you can use drupal_set_message($form_id); and refresh the page to see all form ids on the current page.

Once you have the form id correct, then you can use print_r($form);

For example, I got this working on the comment form on my node type "Announcement":

function MYMODULE_form_alter(&$form, &$form_state, $form_id) {
  if ($form_id == 'comment_node_announcement_form') {
    $form['subject']['#default_value'] = $form['#node']->title;
    //print_r($form);
  }
  //drupal_set_message($form_id); // Use to get $form_id
}