提交按钮仅在从下拉列表中选择后才出现 - drupal 7

Question

从下拉选择列表中选择后出现提交按钮，

谁能帮我理解为什么它不起作用？

$form['user_fields']['optinal_packages'] =  array(
    '#type' => 'select',
    '#title' => t('Optional Packages'),
    '#options' => $packages_array,  
    //'#weight' => 15,
    '#description' => t('Please press the "Push" button to update device package.'),    
    '#default_value' =>  -1,
   );



$form['user_fields']['push'] = array(
    '#type' => 'submit',
    '#value' => t('Push'),
    // '#weight' => 16,
    '#prefix' => '<div id="phone_user_push_package">',
    '#suffix' => '</div>',
    '#states' => array(
        'visible' => array(     // Action to take: Make visible.
        //':input[name="optinal_packages"]' => array('!value' => '-1'),
        'select[name="optinal_packages"]' => array('!value' => '-1'),
        ),
    ),
);

谢谢 布施

Answer 1

将代码改为

$form['user_fields']['push'] = array(
    '#type' => 'submit',
    '#value' => t('Push'),
    // '#weight' => 16,
    '#prefix' => '<div id="phone_user_push_package">',
    '#suffix' => '</div>',
    '#states' => array(
        'invisible' => array( // edited line
            ':select[name="optinal_packages"]' => array('value' => '-1'), // edited line
        ),
    ),
);

将select[name="optinal_packages"] 更改为:select[name="optinal_packages"]。如果不起作用，请尝试将选择器更改为类似 CSS 的 #edit-optinal-packages。

因此代码将是：

'#edit-optinal-packages' => array('value' => '-1'),