hooks - Show admin notice if metabox field is empty during save post

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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
        });
    }
}

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
        });
    }
}

• hooks
• errors
• save-post
• meta-value

Share Improve this question asked May 20, 2024 at 22:32 RickBRickB 1 1

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

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1 Answer 1

Sorted by: Reset to default 0

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.

本文标签： hooksShow admin notice if metabox field is empty during save post