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 *     - private

      // Set this to FALSE if this component cannot be used as a private

      // component. If this is not FALSE, in your implementation of

      // _webform_defaults_COMPONENT(), set ['extra']['private'] property to

      // TRUE or FALSE.

      'private' => FALSE,

 *   Default settings for a newly created webform node as defined by

 *   webform_node_defaults().

 * Allow modules to modify a webform component that will be rendered in a form.

/**

 * Declare conditional types and their operators.

 *

 * Each conditional type defined here may then be referenced in

 * hook_webform_component_info(). For each type this hook also declares a set of

 * operators that may be applied to a component of this conditional type in

 * conditionals.

 *

 * @return array

 *   A 2-dimensional array of operator configurations. The configurations are

 *   keyed first by their conditional type then by operator key. Each operator

 *   declaration is an array with the following keys:

 *   - label: Translated label for this operator that is shown in the UI.

 *   - comparison callback: A callback for server-side evaluation.

 *   - js comparison callback: A JavaScript callback for client-side evaluation.

 *     The callback will be looked for in the Drupal.webform object.

 *   - form callback (optional): A form callback that allows configuring

 *     additional parameters for this operator. Default:

 *     'webform_conditional_operator_text'.

 *

 * @see hook_webform_component_info()

 * @see callback_webform_conditional_comparision_operator()

 * @see callback_webform_conditional_rule_value_form()

 */

function hook_webform_conditional_operator_info() {

  $operators = array();

  $operators['string']['not_equal'] = array(

    'label' => t('is not'),

    'comparison callback' => 'webform_conditional_operator_string_not_equal',

    'js comparison callback' => 'conditionalOperatorStringNotEqual',

  );

  return $operators;

}

/**

 * Alter the list of operators and conditional types.

 *

 * @param array $operators

 *   A data structure as described in hook_webform_conditional_operator_info().

 *

 * @see hook_webform_conditional_operator_info()

 */

function hook_webform_conditional_operators_alter(array &$operators) {

  $operators['string']['not_equal']['label'] = t('not equal');

}

/**

 * Evaluate the operator for a given set of values.

 *

 * This function will be called two times with potentially different kinds of

 * values: Once in _webform_client_form_validate() before any of the validate

 * handlers or the _webform_submit_COMPONENT() callback is called, and once in

 * webform_client_form_pages() after those handlers have been called.

 *

 * @param array $input_values

 *   The values received from the browser.

 * @param mixed $rule_value

 *   The value as configured in the form callback.

 * @param array $component

 *   The component for which we are evaluating the operator.

 *

 * @return bool

 *   The operation result.

 */

function callback_webfom_conditional_comparison_operator(array $input_values, $rule_value, array $component) {

  foreach ($input_values as $value) {

    if (strcasecmp($value, $rule_value)) {

      return TRUE;

    }

  }

  return FALSE;

}

/**

 * Define a form element that configures your operator.

 *

 * @param object $node

 *   The node for which the conditionals are being configured.

 *

 * @return string|string[]

 *   Either a single rendered form element or a rendered form element per

 *   component (keyed by cid). Make sure that none of the rendered strings

 *   contains any HTML IDs as the form element will be rendered multiple times.

 *   The JavaScript will take care of adding the appropriate name attributes.

 *

 * @see _webform_conditional_expand_value_forms()

 */

function callback_webform_conditional_rule_value_form($node) {

  $forms = [];

  foreach ($node->webform['components'] as $cid => $component) {

    if (webform_component_property($component['type'], 'conditional_type') == 'newsletter') {

      $element = [

        '#type' => 'select',

        '#options' => [

          'yes' => t('Opt-in'),

          'no' => t('No opt-in'),

        ],

      ];

      $forms[$cid] = drupal_render($element);

    }

  }

  return $forms;

}