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drupal表单元素: Select(下拉选择框)

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一个来自于modules/statistics/statistics.admin.inc的下拉选择框元素的示例:
 
$period = drupal_map_assoc(array(3600, 10800, 21600, 32400, 43200, 86400, 172800,
    259200, 604800, 1209600, 2419200, 4838400, 9676800), 'format_interval');
 
/* Period now looks like this:
    Array (
        [3600] => 1 hour
        [10800] => 3 hours
        [21600] => 6 hours
        [32400] => 9 hours
        [43200] => 12 hours
        [86400] => 1 day
        [172800] => 2 days
        [259200] => 3 days
        [604800] => 1 week
        [1209600] => 2 weeks
        [2419200] => 4 weeks
        [4838400] => 8 weeks
        [9676800] => 16 weeks )
*/
 
$form['access']['statistics_flush_accesslog_timer'] = array(
    '#type' => 'select',
    '#title' => t('Discard access logs older than'),
    '#default_value' => variable_get('statistics_flush_accesslog_timer',            259200),
    '#options' => $period,
    '#description' => t('Older access log entries (including referrer statistics)
        will be automatically discarded. (Requires a correctly configured
        <a href="@cron">cron maintenance task</a>.)', array('@cron' =>
        url('admin/reports/status'))),
);
 
    通过将属性#options定义为一个包含子菜单选项的关联数组,Drupal支持对下拉选项的分组,如图10-12所示。
 
$options = array(
    array(
        t('Healthy') => array(
            1 => t('wagging'),
            2 => t('upright'),
            3 => t('no tail')
        ),
    ),
    array(
        t('Unhealthy') => array(
            4 => t('bleeding'),
            5 => t('oozing'),
        ),
    ),
);
$form['pet_tail'] = array(
    '#title' => t('Tail demeanor'),
    '#type' => 'select',
    '#description' => t('Pick the closest match that describes the tail
        of your pet.'),
    '#options' => $options,
    '#multiple' => FALSE,
    '#weight' => 20,
);
 
    图10-12 使用分组的下拉选择框
 
    通过将#multiple属性设置为TRUE,可以启用多选。这也将改变$form_state['values']中的值,从一个字符串(例如,'pet_tail' = '2',假定在前面的例子中选择了upright)变为了一个数组(例如,pet_tail = array( 1 => '1', 2 => '2'),假定在前面的例子中同时选择了wagging 和upright)。
    下拉选择框元素的常用属性如下:#attributes, #default_value,#description, #multiple, #options, #prefix, #required, #suffix, #title, #process(默认为form_expand_ahah),和#weight.

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