Druapl6给CCK的field增加attributes属性

首先调用hook_form_alter
使用form的pre_render属性，调用方法
参考以下例子
 

/** 

 * hook_form_alter
 */
function mymodule_form_alter(&$form, &$form_state, $form_id) {
  if ($form_id == 'mymodule_node_form') {
    $form['field_part_1']['#pre_render'] = array('field_part_1_readonly');
    $form['field_part_2']['#pre_render'] = array('field_part_2_disabled');
    $form['field_part_3']['#pre_render'] = array('field_part_3_sort');
  }
}

/**
 * Helper function to readonly the element.
 */
function field_part_1_readonly($element) {
  $element[0]['value']['#attributes'] = array('readonly' => 'readonly', 'class' => 'readonly');
  return $element;
}

/**
 * Helper function to disable the element.
 */
function field_part_2_disabled($element) {
  $element['nid']['nid']['#attributes'] = array('disabled' => 'disabled');
  return $element;
}

/**
 * Helper function to ksort the element.
 */
function field_part_3_sort($element) {
  ksort($element['nid']['nid']['#options']);
  return $element;
}