webform_civicrm_postcode.module

<?php
/**
 * Implements hook_form_alter().
*/
function webform_civicrm_postcode_form_alter(&$form, &$form_state, $form_id) {
  if (strpos($form_id, 'webform_client_form_') !== FALSE
  && !empty($form['#node']->webform_civicrm)) {
    // attach javascript needed for postcode lookup when civipostcode extension is installed and enabled
    if(isPostcodeLookupExtensionEnabled()) {
      global $base_url;

      drupal_add_library('system', 'ui.autocomplete');

      $civiPostcodeFields = getCivipostcodeFieldIds($form['#node']->webform['components']);
      // Assign the postcode lookup provider to form, so that we can call the related function in AJAX
      $settingsStr = CRM_Core_BAO_Setting::getItem('CiviCRM Postcode Lookup', 'api_details');
      $settingsArray = unserialize($settingsStr);

      $form['#attached']['js'][] = drupal_get_path('module', 'webform_civicrm_postcode') . '/js/civipostcode_component.js';
      $form['#attached']['js'][] = array(
        // Pass PHP variables to Drupal.settings.
        'data' => array(
          'baseUrl' => $base_url,
          'civiPostCodeLookupProvider' => $settingsArray['provider'],
          'civiPostCodeFields' => $civiPostcodeFields,
        ),
        'type' => 'setting',
      );
    }
  }
}

/**
 * Implements hook_webform_component_info().
 *
 * @return array
*/
function webform_civicrm_postcode_webform_component_info() {
  $components = array();
  // when civipostcode extension is installed and enabled, civipostcode webform component will be made available
  if(isPostcodeLookupExtensionEnabled()) {
    $components['civipostcode'] = array(
      'label' => t('Civi Postcode'),
      'file' => 'includes/civipostcode_component.inc',
    );
  }

  return $components;
}

/**
 * check if civipostcodelookup extension is enabled.
 *
 * @return boolean
 */
function isPostcodeLookupExtensionEnabled() {
  civicrm_initialize(true);
  $isPostcodeLookupEnabled = CRM_Core_DAO::getFieldValue(
    'CRM_Core_DAO_Extension',
    'uk.co.vedaconsulting.module.civicrmpostcodelookup',
    'is_active',
    'full_name'
  );

  return $isPostcodeLookupEnabled;
}

/**
 * Get list of fields which are of type 'civipostcode'
 *
 * @param array $components
 * @return array $civiPostcodeFields
 */
function getCivipostcodeFieldIds($components) {
  $civiPostcodeFields = array();
  foreach($components as $component) {
    if($component['type'] == 'civipostcode') {
      $civiPostcodeFields[] = str_replace("_", "-", $component['form_key']);
    }
  }

  return $civiPostcodeFields;
}