Menu items visible based on checkbox

Question

I want do show/hide menu items based on a checkbox that the user selects when he/she registers.

I use profile2 for register. Should I use an external jquery script that calls on page load or should I use a hook_menu_alter() in my template file? I am not too familiar with Drupal code yet and appreciate any input.

Answer 1

Solution 1

Add a custom access callback to your paths, that will then determine whether or not the user should have access to a path.

Important: the code below will deny access to those paths. If you just wanted to show a slightly different menu and not block the access to those pages, see solution #2.

For example:

function YOUR_MODULE_menu_alter(&$items) {
  $items['your_path']['access callback'] = 'YOUR_MODULE_menu_access_callback';
}

function YOUR_MODULE_menu_access_callback(){
  global $user;
  if ($user->uid) {
    // Load user's Profile2 profile.
    $profile = profile2_by_uid_load($user->uid, 'NAME_OF_YOUR_PROFILE');
    // Allow access only if the user selected the checkbox.
    if (isset($profile->field_YOUR_FIELD[LANGUAGE_NONE][0]['value']) && $profile->field_YOUR_FIELD[LANGUAGE_NONE][0]['value']) {
      return TRUE;
    }
  }

  // This assumes that anonymous users should not have the access to a
  // particular menu.
  return FALSE;
}

This code would go in a custom module.

---

Solution 2

Add a simple theme_menu_link() override in your front-end theme, and skip rendering of those links.

Important: this will not prevent the access to those pages, it will just skip rendering of those list items. Also, you must be rendering the links using a menu, e.g. place a menu block somewhere in your theme, and not render the menu directly (e.g. theme('links__system_main_menu', ...) or theme('links__system_secondary_menu), ...)).

For example:

function YOUR_THEME_menu_link($variables) {
  global $user;
  $element = $variables ['element'];
  $sub_menu = '';

  // Exclude certain paths.
  if ($user->uid) {
    // Load user's Profile2 profile.
    $profile = profile2_by_uid_load($user->uid, 'NAME_OF_YOUR_PROFILE');
    // Allow access only if the user selected the checkbox.
    if (!isset($profile->field_YOUR_FIELD[LANGUAGE_NONE][0]['value']) || !$profile->field_YOUR_FIELD[LANGUAGE_NONE][0]['value']) {
      // Define the list of paths that should be excluded.
      $paths_to_exclude = array(
        'sample',
      );
      if (in_array($element['#href'], $paths_to_exclude)) {
        // Stop processing here, meaning this list item will not be included in
        // the menu.
        return;
      }
    }
  }

  if ($element ['#below']) {
    $sub_menu = drupal_render($element ['#below']);
  }
  $output = l($element ['#title'], $element ['#href'], $element ['#localized_options']);
  return '<li' . drupal_attributes($element ['#attributes']) . '>' . $output . $sub_menu . "</li>\n";
}

This code would go in the template.php file of your front-end theme.