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Edit File: webform_classes.module

<?php
/**
 * @file
 * The webform_classes module.
 */

/**
 * Standard hook_node_load.
 */
function webform_classes_node_load($nodes, $types) {

foreach ($nodes as $key => $node) {
    $results = db_select('webform_component', 'wc')
    ->fields('wc', array('class', 'cid'))
    ->condition('nid', (int) $node->nid, '=')
    ->execute();

$classlist = array();
    while ($record = $results->fetchAssoc()) {
      $classlist[$record['cid']] = $record['class'];
    }
    $node->webform_classes = $classlist;
  }
}

/**
 * Standard use of hook_form_alter.
 */
function webform_classes_form_alter(&$form, &$form_state, $form_id) {

if (substr($form['#id'], 0, 20) == 'webform-client-form-') {
    webform_classes_add_classes($form, substr($form['#id'], 20), $form['#node']->webform_classes);
  }
}

/**
 * Standard use of hook_form_alter_webform_component_edit_form_alter.
 */
function webform_classes_form_webform_component_edit_form_alter(&$form, $component) {
  $nid = $form['nid']['#value'];
  $cid = $form['cid']['#value'];
  if ($cid == NULL) {
    $cid = 0;
  }
  $class = db_select('webform_component', 'wc')
    ->fields('wc', array('class'))
    ->condition('nid', (int) $nid, '=')
    ->condition('cid', (int) $cid, '=')
    ->execute()
    ->fetchAssoc();
  $form['classes'] = array(
    '#type' => 'fieldset',
    '#title' => t('Classes'),
    '#collapsible' => TRUE,
    '#collapsed' => FALSE,
    '#weight' => 5,
    'classes' => array(
      '#type' => 'textfield',
      '#title' => t('Class'),
      '#default_value' => $class,
      '#description' => t('Specific class or classes (seperated by space) for this element of the form.'),
      '#size' => 26,
      '#maxlength' => 255,
      '#weight' => 1,
    ),
  );
}

/**
 * Called standard component update hook.
 */
function webform_classes_webform_component_update($component) {

$default_class = isset($component['class']) ? $component['class'] : '';

$nid = $component['nid'];
  $cid = $component['cid'];
  $class = (isset($component['classes']['classes'])) ? $component['classes']['classes'] : $default_class;
  $result = db_update('webform_component')
    ->fields(array(
    'class'=> $class,
     ))
     ->condition('nid', (int) $nid, '=')
     ->condition('cid', (int) $cid, '=')
     ->execute();
}

/**
 * Respond to a Webform component being inserted into the database.
 */
function webform_classes_webform_component_insert($component) {
  webform_classes_webform_component_update($component);
}

/**
 * This is what alters the rendering.
 */
function webform_classes_add_classes(&$form_element, $nid, $classes) {

webform_classes_add_a_class($form_element, $nid, $classes);
  $components = element_children($form_element);
  foreach ($components as $key => $component_id) {
    $child_element = &$form_element[$component_id];
    webform_classes_add_classes($child_element, $nid, $classes);
  }
}

/**
 * Called by webform_classes_add_classes within the foreach loop.
 */
function webform_classes_add_a_class(&$form_element, $nid, $classes) {

$cid = 0;
  if (isset($form_element['#webform_component']['cid'])) {
    $cid = $form_element['#webform_component']['cid'];
  }

if (isset($form_element['#attributes']['class'])) {
    $current_class = $form_element['#attributes']['class'];
  }
  else {
    $current_class = NULL;
  }

if ($cid != 0) {
    if ($current_class != NULL) {
      $form_element['#attributes']['class'] = array_merge($form_element['#attributes']['class'], array($classes[$cid]));
    }
    else {
      $form_element['#attributes']['class'] = array($classes[$cid]);
    }
  }

}