我编写了一个插件，可以创建带有自定义字段的自定义帖子类型。为了防止用户输入错误信息，如何验证数据？
我假设save\\u post hook函数将处理字段验证，但我似乎找不到一种直接向用户显示错误的方法。
是否有内置的wordpress功能？完成自定义字段验证的一般技术是什么？
如何验证自定义帖子类型中的自定义字段？
5 个回复
最合适的回答,由SO网友:Ian Dunn 整理而成
你在正确的轨道上。我在save_post 回调，然后使用admin notices 当字段验证失败时，向用户显示错误。它们显示在页面顶部的突出显示框中，就像WordPress本身生成的任何错误/消息一样。
下面是创建管理通知的简单示例：
function my_admin_notice()
{
?>
<div class="updated">
<p>Aenean eros ante, porta commodo lacinia.</p>
</div>
<?php
}
add_action( \'admin_notices\', \'my_admin_notice\' );
if( $pizza != \'warm\' )
$notices->enqueue( \'Pizza is not warm\', \'error\' );
enqueue() 您可以自己使用函数（以及打印通知的函数），也可以包括一个库，如IDAdminNotices.以下是a plugin I wrote. 这使用内置于类本身的通知排队/打印函数，而不包括外部库。
public function saveCustomFields( $postID )
{
// ...
if( filter_var( $_POST[ self::PREFIX . \'zIndex\'], FILTER_VALIDATE_INT ) === FALSE )
{
update_post_meta( $post->ID, self::PREFIX . \'zIndex\', 0 );
$this->enqueueMessage( \'The stacking order has to be an integer.\', \'error\' );
}
else
update_post_meta( $post->ID, self::PREFIX . \'zIndex\', $_POST[ self::PREFIX . \'zIndex\'] );
// ...
}
add_action( \'save_post\', array( $this, \'saveCustomFields\' );
SO网友:Kevin Phillips
我编写了一个小插件，它不仅可以验证自定义帖子类型上的输入字段，还可以删除默认的管理通知，而不使用Javascript。
下面是一些代码
/验证筛选器
$title = $album->post_title;
if ( ! $title ) {
$errors[\'title\'] = "The title is required";
}
// if we have errors lets setup some messages
if (! empty($errors)) {
// we must remove this action or it will loop for ever
remove_action(\'save_post\', \'album_save_post\');
// save the errors as option
update_option(\'album_errors\', $errors);
// Change post from published to draft
$album->post_status = \'draft\';
// update the post
wp_update_post( $album );
// we must add back this action
add_action(\'save_post\', \'album_save_post\');
// admin_notice is create by a $_GET[\'message\'] with a number that wordpress uses to
// display the admin message so we will add a filter for replacing default admin message with a redirect
add_filter( \'redirect_post_location\', \'album_post_redirect_filter\' );
}
SO网友:Lucas Bustamante
何时save_post 运行时，它已将帖子保存在数据库中
如果您使用的是ACF，它具有内置验证。然而，如果您需要验证ACF之外的内容，例如post\\u title，那么事情会变得更加复杂。
查看WordPress核心代码，尤其是wp-includes/post.php\'supdate_post() 函数，在将请求保存到数据库之前，没有内置的方法来拦截请求。
然而，我们可以钩住pre_post_update 和使用header() 和get_post_edit_link() 阻止保存帖子。
<?php
/**
* Performs custom validation on custom post type "Site"
*/
function custom_post_site_save($post_id, $post_data) {
# If this is just a revision, don\'t do anything.
if (wp_is_post_revision($post_id))
return;
if ($post_data[\'post_type\'] == \'site\') {
# In this example, we will raise an error for post titles with less than 5 characters
if (strlen($post_data[\'post_title\']) < 5) {
# Add a notification
update_option(\'my_notifications\', json_encode(array(\'error\', \'Post title can\\\'t be less than 5 characters.\')));
# And redirect
header(\'Location: \'.get_edit_post_link($post_id, \'redirect\'));
exit;
}
}
}
add_action( \'pre_post_update\', \'custom_post_site_save\', 10, 2);
/**
* Shows custom notifications on wordpress admin panel
*/
function my_notification() {
$notifications = get_option(\'my_notifications\');
if (!empty($notifications)) {
$notifications = json_decode($notifications);
#notifications[0] = (string) Type of notification: error, updated or update-nag
#notifications[1] = (string) Message
#notifications[2] = (boolean) is_dismissible?
switch ($notifications[0]) {
case \'error\': # red
case \'updated\': # green
case \'update-nag\': # ?
$class = $notifications[0];
break;
default:
# Defaults to error just in case
$class = \'error\';
break;
}
$is_dismissable = \'\';
if (isset($notifications[2]) && $notifications[2] == true)
$is_dismissable = \'is_dismissable\';
echo \'<div class="\'.$class.\' notice \'.$is_dismissable.\'">\';
echo \'<p>\'.$notifications[1].\'</p>\';
echo \'</div>\';
# Let\'s reset the notification
update_option(\'my_notifications\', false);
}
}
add_action( \'admin_notices\', \'my_notification\' );
SO网友:Alan Tygel
我只想补充一下@Lucas Bustamante的优秀答案，自定义字段的值可以通过$_POST 全球的
因此，如果验证引用自定义字段，@Lucas Bustamante answer也是有效的。例如：
<?php
/**
* Performs custom validation on custom post type "Site"
*/
function custom_post_site_save($post_id, $post_data) {
# If this is just a revision, don\'t do anything.
if (wp_is_post_revision($post_id))
return;
if ($post_data[\'post_type\'] == \'site\') {
# In this example, we will raise an error for post titles with less than 5 characters
if (strlen($_POST[\'zip_code\']) < 5) {
# Add a notification
update_option(\'my_notifications\', json_encode(array(\'error\', \'Zip code can\\\'t be less than 5 characters.\')));
# And redirect
header(\'Location: \'.get_edit_post_link($post_id, \'redirect\'));
exit;
}
}
}
add_action( \'pre_post_update\', \'custom_post_site_save\', 10, 2);
/**
* Shows custom notifications on wordpress admin panel
*/
function my_notification() {
$notifications = get_option(\'my_notifications\');
if (!empty($notifications)) {
$notifications = json_decode($notifications);
#notifications[0] = (string) Type of notification: error, updated or update-nag
#notifications[1] = (string) Message
#notifications[2] = (boolean) is_dismissible?
switch ($notifications[0]) {
case \'error\': # red
case \'updated\': # green
case \'update-nag\': # ?
$class = $notifications[0];
break;
default:
# Defaults to error just in case
$class = \'error\';
break;
}
$is_dismissable = \'\';
if (isset($notifications[2]) && $notifications[2] == true)
$is_dismissable = \'is_dismissable\';
echo \'<div class="\'.$class.\' notice \'.$is_dismissable.\'">\';
echo \'<p>\'.$notifications[1].\'</p>\';
echo \'</div>\';
# Let\'s reset the notification
update_option(\'my_notifications\', false);
}
}
add_action( \'admin_notices\', \'my_notification\' );
``
SO网友:xXxlazharxXx
您可以使用；wp\\U insert\\U post\\U数据“；在将数据插入数据库之前过滤到修改器或检查数据
add_filter( \'wp_insert_post_data\', \'validate_posttypes\' );
function wpb_custom_excerpt($data) {
str_starts_with($data[\'post_title\'],\'wp\')?$data[\'post_title\']=\'wp\'.$data[\'post_title\']:null;
return $data;
}
结束