vertical_tabs_example.module

<?php

/**
 * @file
 * Shows how to use the vertical tabs functionality provided by Drupal 7. This
 * example does not cover how to save / load custom setting, and only deals with
 * elements visibility.
 */

/**
 * Implements hook_menu for a simple explanation page.
 */
function vertical_tabs_example_menu() {
  $items['examples/vertical_tabs'] = array(
    'title' => 'Vertical tabs example',
    'description' => 'Shows how vertical tabs can best be supported by a custom module',
    'page callback' => '_vertical_tabs_example_explanation',
    'access callback' => TRUE,
  );
  return $items;
}

/**
 * Implement hook_form_alter().
 *
 * Adds custom fieldset to the node form, and attach ajax behaviour for vertical
 * panels to update the settings description.
 */
function vertical_tabs_example_form_alter(&$form, $form_state, $form_id) {
  // Only include on node add/edit forms.
  if (!empty($form['#node_edit_form'])) {

    $form['vertical_tabs_example'] = array(
      '#type' => 'fieldset',
      '#title' => t('Example vertical tab'),
      '#collapsible' => TRUE,
      '#collapsed' => FALSE,
      // The #group value must match the name of the vertical tabs element.
      // In most cases, this is 'additional_settings'.
      '#group' => 'additional_settings',
      // Attach the javascript for vertical tabs.
      '#attached' => array(
        'js' => array(
          'vertical-tabs' => drupal_get_path('module', 'vertical_tabs_example') . '/vertical_tabs_example.js',
        ),
      ),
      '#tree' => TRUE,
      '#weight' => -2,
    );

    // This checkbox is used to show or hide the custom settings form using
    // javascript (altering states of a container defined later).
    $form['vertical_tabs_example']['enabled'] = array(
      '#type' => 'checkbox',
      '#title' => t('Use custom configuration'),
      '#default_value' => FALSE,
    );

    // This container will be used to store the whole form for our custom
    // settings. This way, showing/hidding the form using javascript is easier,
    // as only one element should be set visible.
    $form['vertical_tabs_example']['vertical_tabs_examplecontainer'] = array(
      '#type' => 'container',
      '#parents' => array('vertical_tabs_example'),
      '#states' => array(
        'invisible' => array(
          // If the checkbox is not enabled, show the container.
          'input[name="vertical_tabs_example[enabled]"]' => array('checked' => FALSE),
        ),
      ),
    );

    // The string of this textfield will be shown as summary in the vertical
    // tab.
    $form['vertical_tabs_example']['vertical_tabs_examplecontainer']['custom_setting'] = array(
      '#type' => 'textfield',
      '#title' => t('Use this custom setting'),
      '#default_value' => '',
      '#description' => t('This field is a demonstration about how to use Vertical Tabs in your forms. This setting will not be saved.'),
    );
  }
}

/**
 * Simple explanation page.
 */
function _vertical_tabs_example_explanation() {
  return t("The Vertical Tabs Example shows how a custom module can best support vertical tabs. To see the effects of this module, look at the <a href='!node_add'>node/add</a> form", array('!node_add' => url('node/add')));
}