Best way to make new groups mailinglists by default

Question

I wonder how I may preset the mailinglist group type checkbox in group's edit form for new groups.

From a quick glance to code and db I assume that the is_default field in the db is not used here (have tried also).

So how could I do if I want to avoid a client side/js hack?

Answer 1

I would create a custom extension as explained here or using an existing one and implementing hook_civicrm_buildForm

Updated

function myextension_civicrm_buildForm( $formName, &$form ) {
  if ("CRM_Group_Form_Edit" == $formName) {
    if ($form->getAction() == CRM_Core_Action::ADD) {
      $defaults = array ("group_type[2]" => true);
      $form->setDefaults($defaults);
    }
  }
}

That will make the Mailing list checkbox checked by default.