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Mandatory (meta) fields in post edit screen (1 post)

  1. GRAQ
    Member
    Posted 2 years ago #

    With use of custom post types exploding, and WordPress use beyond 'pages' and 'blogging' being more clearly defined and easier to implement, creating 'things' that have compulsory data elements seems a common requirement.

    There are quite a few support posts about required or mandatory fields that appear unsatisfactorily answered stretching back over a few years.

    How does one make a field compulsory? Is it possible to hook into save_post, check for the field and return a message?

    Here is how I thought it might be done:

    add_action('save_post', 'my_check_mandatory');
    function  my_check_mandatory($post_id){
      $post = get_post($post_id);
      if( $post->post_type=='my_post_type' && empty($_POST['mandatory_field']) ){
        return new WP_Error('missing_field', __('Mandatory (Exhibitor) field missing'));
      }
    }

    Any takers on how to actually do this?

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