Show admin notice if metabox field is empty during save post

Question

Who can help me a little.

I try to get an admin error notice if a metabox field is empty during save post. Wordpress refresh the page after saving so the hook admin_notices does not work.

Here is my saving code

add_action('save_post', function($post_id){ if(isset($_POST['add']) && $_POST['add'] != ''){ update_post_meta($post_id, 'add', $_POST['add']); }else{ add_action( 'admin_notices', function(){ ?> <p><?php _e( 'Error!', 'Field add is empty!' ); ?></p> <?php }); } }

Would it not make more sense to add the required attribute to the meta field? — Chris Cox
– Chris Cox, Commented May 26, 2024 at 11:18

Antti Koskinen · Accepted Answer · 2024-05-21 18:22:16Z

You could for example save an error flag to a transient in save_post, if a required field is empty, and the display the admin notice based on the transient. This concept is demonstrated in in this old answer.

Another option is to add a simple script to the editing view which would alert the user that the said field is empty. Or just add required html attribute to the input field.

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