function vertical_tabs_example_form_alter

Implements hook_form_alter().

Adds custom fieldset to the node form, and attach ajax behaviour for vertical panels to update the settings description.

See also

vertical_tabs_example.js

Related topics

File

modules/examples/vertical_tabs_example/vertical_tabs_example.module, line 42

Hook implementations for the Vertical Tabs Example module.

Code

function vertical_tabs_example_form_alter(&$form, $form_state, $form_id) {
  // Only include on node add/edit forms.
  if (isset($form['#node']) && $form['#node']->type . '_node_form' == $form_id) {
    // Create a fieldset that will be included in the vertical tab.
    $form['vertical_tabs_example'] = array(
      '#type' => 'fieldset',
      '#title' => t('Example vertical tab'),
      '#collapsible' => TRUE,
      '#collapsed' => FALSE,
      '#tree' => TRUE,
      // Send this tab to the top of the list.
      '#weight' => -99,
      // The #group value must match the name of the vertical tabs element.
      // In most cases, this is 'additional_settings'.
      '#group' => 'additional_settings',
      // Vertical tabs provide its most usable appearance when they are used to
      // include a summary of the information contained in the fieldset. To do
      // this, we attach additional JavaScript to handle changing the summary
      // when form settings are changed.
      '#attached' => array(
        'js' => array(
          'vertical-tabs' => backdrop_get_path('module', 'vertical_tabs_example') . '/vertical_tabs_example.js',
        ),
      ),
    );

    // The form elements below provide a demonstration of how a fieldset
    // summary can be displayed in a collapsed tab.
    //
    // 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('Change this setting'),
      '#default_value' => FALSE,
    );

    // This container will be used to store the whole form for our custom
    // settings. This way, showing/hiding 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 setting instead'),
      '#default_value' => 'I am a setting with a summary',
      '#description' => t('As you type into this field, the summary will be updated in the tab.'),
    );
  }
}