How to alter a MENU_LOCAL_TASK tab menu in Drupal

drupal, drupal-6

Solution

You could do this by overriding `theme_menu_local_tasks()` within your theme:

function yourTheme_menu_local_tasks() {
  // Prepare empty dropdown to allow for unconditional addition to output below
  $dropdown = '';
  // Check if the dropdown should be added to this menu
  $inject_dropdown = TRUE; // TODO: Add checking logic according to your needs, e.g. by inspecting the path via arg()
  // Injection wanted?
  if ($inject_dropdown) {
    // Yes, build the dropdown using Forms API
    $select = array(
      '#type' => 'select',
      '#title' => t('Number of results:'),
      '#options' => array('10', '20', '50', '100'),
    );
    // Wrap rendered select in <li> tag to fit within the rest of the tabs list
    $dropdown = '<li>' . drupal_render($select) . '</li>';
  }

  // NOTE: The following is just a copy of the default theme_menu_local_tasks(),
  // with the addition of the (possibly empty) $dropdown variable output
  $output = '';
  if ($primary = menu_primary_local_tasks()) {
    $output .= "<ul class=\"tabs primary\">\n". $primary . $dropdown . "</ul>\n";
  }
  if ($secondary = menu_secondary_local_tasks()) {
    $output .= "<ul class=\"tabs secondary\">\n". $secondary ."</ul>\n";
  }

  return $output;
}

(NOTE: Untested code - potential typos)

Problem

I have built a tabbed menu in my custom Drupal 6 module. I want to position an html dropdown list to the right of the tabbed menu at the top of my module page. The list will fire some ajax events on change e.g. changing the LIMIT clause on SQL query by specifying 10,20,50,100 results. How can I achieve this in Drupal without hacking templates? Thanks,

Original source