Drupal 7 Forms API - AJAX Forms 错误：检测到非法选择。请联系网站管理员

我设置了一个表单，用户可以从下拉列表中选择一个项目。一旦选择该项目，就会填充另一个下拉列表。然后，根据从第二个下拉列表中选择的值，可能会或可能不会显示字段集。如果显示字段集，则有一个字段和一个按钮。通过单击该按钮，您可以添加同一字段的另一个副本。一旦有多个，也会出现“删除一个”按钮。我从这里得到了代码的基础：http://api.drupal.org/api/examples/ajax_example%21ajax_example_graceful_degradation.inc/function/ajax_example_add_more/7 http://api.drupal.org/api/examples/ajax_example%21ajax_example_graceful_degradation.inc/function/ajax_example_add_more/7

问题是，当我第一次单击“添加另一个调查问题”时，它工作正常并添加一个字段。当我第二次单击它或当我单击删除（现在有两个）时，我收到此错误：“检测到非法选择。”请联系网站管理员。'

我究竟做错了什么？

这是我的代码：

function touchpoints_addmetric_form($form, &$form_state, $tp_id) {
    $selectedType = isset($form_state['values']['type']) ? $form_state['values']['type'] : FALSE;
    $types = db_query('SELECT * FROM {touchpoints_metric_types}') -> fetchAllKeyed(0, 1);
    $form['#tree'] = TRUE;
    $form['type'] = array(
        '#type' => 'select',
        '#title' => t('Metric Type'),
        '#options' => $types,
        '#required'=>TRUE,
        '#ajax' => array(
            'event' => 'change',
            'wrapper' => 'method-wrapper',
            'callback' => 'touchpoints_method_callback'
        )
    );
    $form['measurementmethod'] = array(
        '#type' => 'select',
        '#title' => t('Measurement Method'),
        '#required'=>TRUE,
        '#prefix' => '<div id="method-wrapper">',
        '#suffix' => '</div>',
        '#options' => _get_methods($selectedType)
    );
    $form['survey'] = array('
        #type' => 'fieldset',
        '#collapsible' => FALSE,
        '#states' => array(
            'visible' => array(
                array(
                    array(':input[name="measurementmethod"]' => array('value' => '5')), 
                    'xor', 
                    array(':input[name="measurementmethod"]' => array('value' => '6')),
                    'xor', 
                    array(':input[name="measurementmethod"]' => array('value' => '7'))
                )
            )
        )
    );
    $form['survey']['contents'] = array(
        '#type' => 'fieldset',
        '#collapsible' => FALSE,
        '#prefix' => '<div id="survey-div">', 
        '#suffix' => '</div>', 
    );
    if (empty($form_state['num_surveys'])) {
        $form_state['num_surveys'] = 1;
    }
    for ($i = 1; $i <= $form_state['num_surveys']; $i++) {
        $form['survey']['contents']['survey_question'][$i] = array(
            '#type' => 'textfield',
            '#title' => t('Survey Question ' . $i),
            '#size' => 70, '#maxlength' => 100, 
        );
    }
    $form['survey']['contents']['addsurvey'] = array(
        '#type' => 'submit',
        '#value' => t('Add Another Survey Question'),
        '#submit' => array('touchpoints_metrics_survey_add_one'),
        '#limit_validation_errors' => array(),
        '#ajax' => array(
            'callback' => 'touchpoints_metrics_survey_callback', 
            'wrapper' => 'survey-div', 
        ), 
    );
    if ($form_state['num_surveys'] > 1) {
        $form['survey']['contents']['removesurvey'] = array(
            '#type' => 'submit',
            '#value' => t('Remove A Survey Question'),
            '#submit' => array('touchpoints_metrics_survey_remove_one'), 
            '#limit_validation_errors' => array(), 
            '#ajax' => array(
                'callback' => 'touchpoints_metrics_survey_callback', 
                'wrapper' => 'survey-div', 
            ), 
        );
    }
    return $form;
}

function _get_methods($selected) {
    if ($selected) {
        $methods = db_query("SELECT * FROM {touchpoints_m_methods} WHERE mt_id=$selected") -> fetchAllKeyed(0, 2);
    } else {
        $methods = array();
    }
    return $methods;
}

function touchpoints_method_callback($form, &$form_state) {
    return $form['measurementmethod'];
}

function touchpoints_metrics_survey_add_one($form, &$form_state) {
    $form_state['num_surveys']++;
    $form_state['rebuild'] = TRUE;
}

function touchpoints_metrics_survey_remove_one($form, &$form_state) {
    if ($form_state['num_surveys'] > 1) {
        $form_state['num_surveys']--;
    }
    $form_state['rebuild'] = TRUE;
}

function touchpoints_metrics_survey_callback($form, &$form_state) {
    return $form['survey']['contents'];
}

我曾多次遇到此错误，这就是我发现的：

This is Drupal's way of saying "Hey, you tried to submit this form with a , checkbox or radio button option that wasn't included in the original form definition! That's not allowed." - See more at: http://proofgroup.com/blog/2008/jul/debugging_mysterious_illegal_choice_has_been_detected_please_contact_site_administrato#sthash.vDNmqslL.dpuf

也许您应该考虑模块而不是自定义代码条件字段 https://drupal.org/project/conditional_fields

或者解决方法：'#validate' => TRUE source http://anilmaharjan.com.np/blog/2013/02/an-illegal-choice-has-been-detected-in-drupal-select-field-bypass-validation-for-ajax-loaded-options