Passing error/warning messages from a meta box to “admin_notices”

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I have a simple meta box that updates the post custom fields (using update_post_meta()).

How can I send a error or warning message to the next page after the user publishes/updates the post and doesn’t fill one of the meta box fields (or fills them with invalid data) ?

4

You can do this by hand, but WP natively does it like this for settings errors:

  1. add_settings_error() to create message.
  2. Then set_transient('settings_errors', get_settings_errors(), 30);
  3. settings_errors() in admin_notices hook to display (will need to hook for non-settings screens).

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