作者：老葛，北京亚艾元软件有限责任公司，http://www.yaiyuan.com
再往下，就是在field_validation\plugins\export_ui里面创建field_validation_export_ui.inc文件，这里的代码有点长：
/**
* Define this Export UI plugin.
*/
$plugin = array(
'schema' => 'field_validation_rule',
'access' => 'administer site configuration',
'menu' => array(
'menu item' => 'field_validation',
'menu prefix' => 'admin/structure',
'menu title' => 'Field Validation',
'menu description' => 'Administer Field Validation rules.',
),
'title singular' => t('rule'),
'title plural' => t('rules'),
'title singular proper' => t('Field Validation rule'),
'title plural proper' => t('Field Validation rules'),
'form' => array(
'settings' => 'field_validation_ctools_export_ui_form',
'validate' => 'field_validation_ctools_export_ui_form_validate',
'submit' => 'field_validation_ctools_export_ui_form_submit',
),
);
/**
* Define the add/edit form of validation rule.
*/
function field_validation_ctools_export_ui_form(&$form, &$form_state) {
ctools_include('export');
$rule = $form_state['item'];
$default_rulename = isset($rule->rulename) ? $rule->rulename : '';
$default_entity_type = isset($rule->entity_type) ? $rule->entity_type : '';
$default_bundle = isset($rule->bundle) ? $rule->bundle : '';
$default_field_name = isset($rule->field_name) ? $rule->field_name : '';
$default_col = isset($rule->col) ? $rule->col : '';
$default_validator = isset($rule->validator) ? $rule->validator : '';
$default_data = isset($rule->data) ? $rule->data : '';
$default_error_message = isset($rule->error_message) ? $rule->error_message : '';
//print debug($form_state);
$default_rulename = isset($form_state['values']['rulename']) ? $form_state['values']['rulename'] : $default_rulename;
$default_entity_type = isset($form_state['values']['entity_type']) ? $form_state['values']['entity_type'] : $default_entity_type;
$default_bundle = isset($form_state['values']['bundle']) ? $form_state['values']['bundle'] : $default_bundle;
$default_field_name = isset($form_state['values']['field_name']) ? $form_state['values']['field_name'] : $default_field_name;
$default_col = isset($form_state['values']['col']) ? $form_state['values']['col'] : $default_col;
$default_validator = isset($form_state['values']['validator']) ? $form_state['values']['validator'] : $default_validator;
$default_data = isset($form_state['values']['data']) ? $form_state['values']['data'] : $default_data;
$default_error_message = isset($form_state['values']['error_message']) ? $form_state['values']['error_message'] : $default_error_message;
//print debug($rule);
$form['rulename'] = array(
'#type' => 'textfield',
'#title' => t('Rule name'),
'#default_value' => $default_rulename,
'#required' => TRUE,
'#size' => 60,
'#maxlength' => 255,
// '#weight' => 1,
);
$entity_type_options = array(
'' => 'Choose an entity type',
);
$entity_types = entity_get_info();
foreach ($entity_types as $key => $entity_type) {
$entity_type_options[$key] = $entity_type['label'];
}
$form['entity_type'] = array(
'#type' => 'select',
'#options' => $entity_type_options,
'#title' => t('Entity type'),
'#default_value' => $default_entity_type,
'#required' => TRUE,
'#ajax' => array(
'callback' => 'field_validation_entity_type_callback',
'wrapper' => 'validation-rule-wrapper-div',
'method' => 'replace',
'effect' => 'fade',
),
);
$bundle_options = array(
'' => 'Choose a bundle',
);
// print debug($entity_types['node']);
$bundles = !empty($entity_types[$default_entity_type]['bundles']) ? $entity_types[$default_entity_type]['bundles'] : array();
// $bundles = !empty($entity_types['node']['bundles']) ? $entity_types['node']['bundles'] : array();
// print debug($default_entity_type);
foreach ($bundles as $key => $bundle) {
$bundle_options[$key] = $bundle['label'];
}
$form['bundle'] = array(
'#type' => 'select',
'#options' => $bundle_options,
'#title' => t('Bundle name'),
'#default_value' => $default_bundle,
'#required' => TRUE,
'#prefix' => '<div id="bundle-wrapper-div">',
'#suffix' => '</div>',
'#ajax' => array(
'callback' => 'field_validation_bundle_callback',
'wrapper' => 'validation-rule-wrapper-div',
'method' => 'replace',
'effect' => 'fade',
),
);
$field_name_options = array(
'' => 'Choose a field',
);
$instances = array();
if(!empty($default_entity_type) && !empty($default_bundle)){
$instances = field_info_instances($default_entity_type, $default_bundle);
}
//$instances = field_info_instances('node', 'article');
foreach ($instances as $key => $instance) {
$field_name_options[$key] = $instance['label'];
}
if(!in_array($default_field_name, array_keys($field_name_options))){
$default_field_name = '';
}
$form['field_name'] = array(
'#type' => 'select',
'#options' => $field_name_options,
'#title' => t('Field name'),
'#default_value' => $default_field_name,
'#required' => TRUE,
'#prefix' => '<div id="field-name-wrapper-div">',
'#suffix' => '</div>',
'#ajax' => array(
'callback' => 'field_validation_field_name_callback',
'wrapper' => 'col-wrapper-div',
'method' => 'replace',
'effect' => 'fade',
),
);
$field = field_info_field($default_field_name);
//print debug($field);
$col_options = array(
'' => t('Choose a column'),
);
$columns = !empty($field['columns']) ? $field['columns'] : array();
foreach ($columns as $key => $column) {
$col_options[$key] = $key;
}
if(!in_array($default_col, array_keys($col_options))){
$default_col = '';
}
$form['col'] = array(
'#type' => 'select',
'#options' => $col_options,
'#title' => t('Column'),
'#description' => t('A column defined in the hook_field_schema() of this field.'),
'#default_value' => $default_col,
'#required' => TRUE,
'#weight' => 2,
'#prefix' => '<div id="col-wrapper-div">',
'#suffix' => '</div>',
);
$validator_options = array(
'' => 'Choose a validator',
);
$validators = field_validation_get_validators();
foreach ($validators as $validator_key => $validator_info) {
$validator_options[$validator_key] = $validator_info['name'];
}
$form['validator'] = array(
'#type' => 'select',
'#options' => $validator_options,
'#title' => t('Validator'),
'#description' => t('A column defined in the hook_field_schema() of this field.'),
'#default_value' => $default_validator,
'#required' => TRUE,
'#weight' => 3,
'#ajax' => array(
'callback' => 'field_validation_validator_callback',
'wrapper' => 'data-wrapper-div',
'method' => 'replace',
'effect' => 'fade',
),
);
$form['data'] = array(
'#type' => 'textfield',
'#title' => t('Config Data'),
'#required' => FALSE,
'#size' => 60,
'#maxlength' => 255,
'#default_value' => $default_data,
'#weight' => 4,
'#prefix' => '<div id="data-wrapper-div">',
'#suffix' => '</div>',
);
//$rule_validator = $validators[$default_validator];
if (isset($validators[$default_validator]['custom_data']) && is_array($validators[$default_validator]['custom_data'])) {
$required = isset($validators[$default_validator]['custom_data']['required']) ? $validators[$default_validator]['custom_data']['required'] : TRUE;
$form['data']['#title'] = isset($validators[$default_validator]['custom_data']['label']) ? $validators[$default_validator]['custom_data']['label'] : t('Config Data');
$form['data']['#description'] = isset($validators[$default_validator]['custom_data']['description']) ? $validators[$default_validator]['custom_data']['description'] : t('Config Data');
$form['data']['#required'] = ($required !== FALSE) ? TRUE : FALSE;
}
$form['error_message'] = array(
'#type' => 'textfield',
'#title' => t('Custom error message'),
'#description' => t("Specify an error message that should be displayed when user input doesn't pass validation"),
'#required' => TRUE,
'#size' => 60,
'#maxlength' => 255,
'#default_value' => $default_error_message,
'#weight' => 5,
);
$form['#prefix'] = '<div id="validation-rule-wrapper-div">';
$form['#suffix'] = '</div>';
}
/**
* Validation handler for the validation rule add/edit form.
*/
function field_validation_ctools_export_ui_form_validate($form, &$form_state) {
$values = $form_state['values'];
}
/**
* Submit handler for the preset edit form.
*/
function field_validation_ctools_export_ui_form_submit($form, &$form_state) {
$values = $form_state['values'];
}
function field_validation_entity_type_callback($form,&$form_state){
return $form;
}
function field_validation_bundle_callback($form,&$form_state){
return $form;
}
function field_validation_field_name_callback($form,&$form_state){
return $form['col'];
}
function field_validation_validator_callback($form,&$form_state){
return $form['data'];
}
最上面的plugin，这是Ctools插件的常用定义方法，代码是从别的地方复制过来的，我只是改了一下名字而已，把对应的改为Field validation。
而field_validation_ctools_export_ui_form，就是一个普通的表单，我在里面使用了AJAX技术。这个表单是用来在admin/structure/field_validation这个管理界面，添加/编辑验证规则使用的。这样在RC1版里面，我们提供了两种方式，来添加验证规则，一种是原来编写的admin.inc里面的，一种就是这种基于Ctools的方式。在这个表单里面使用Drupal自带的AJAX，Ctools早期的版本是不支持的，我写这个功能的时候，恰好支持了这个特性。
这里面，使用了函数entity_get_info来获取所有的实体信息，返回的实体信息数组里面，也包含每个实体里面的bundle（包）信息。而获取某类实体下面的bundles信息，则采用下面的代码：
$bundles = !empty($entity_types[$default_entity_type]['bundles']) ? $entity_types[$default_entity_type]['bundles'] : array();
还有一段代码，也值得学习一下，这段代码的作用是，我们获取一个字段上面包含多少个columns，让用户选择column，而不是输入，这在RC1 里面是一个改进，我以前是不知道这种方式的：
$field = field_info_field($default_field_name);
$col_options = array(
'' => t('Choose a column'),
);
$columns = !empty($field['columns']) ? $field['columns'] : array();
foreach ($columns as $key => $column) {
$col_options[$key] = $key;
}
有关这里的AJAX效果实现，这里就不介绍了，参看第一集的省市县三级联动。验证规则的导出功能实现以后，让我欣喜不已，不过很快发现一个小问题，就是导出验证规则的时候，将ruleid也导出来了。在Ctools的作者的帮助下，很快就修正了这个问题：
'ruleid' => array(
'type' => 'serial',
'description' => 'Unique identifier of the validation rule',
'unsigned' => TRUE,
'not null' => TRUE,
'no export' => TRUE,
),
这里面，加了一个键'no export'，并将它设置为TRUE，这样就可以避免导出ruleid了。
