Admin notice for custom fields in users dashboard - php

Question

In Wordpress, I added some fields in the users dashboard. I made them required but I'd like to display a message if they are empty.
Here is an example (just one field) of what I did :
function my_admin_notice() { ?>
<div class="error">
<p><?php _e( 'Error!', 'user_street' ); ?></p>
</div>
<?php
}
function save_extra_user_profile_fields( $user_id ) {
if ( !current_user_can( 'edit_user', $user_id ) ) {
return false;
}
if (!empty($_POST['user_street'])) {
update_user_meta( $user_id, 'user_street', $_POST['user_street'] );
}
else {
add_action('admin_notices', 'my_admin_notice');
return false;
}
}
add_action( 'personal_options_update', 'save_extra_user_profile_fields' );
add_action( 'edit_user_profile_update', 'save_extra_user_profile_fields' );
Unfortunately, nothing happens.
I also tried with add_settings_error but I had the same problem.
Can someone give me a hand or just explain to me what I am doing wrong? It would be much appreciated! Thank you very much!

Answer 1

Looks like it's too late to add the admin_notice. An alternative is to use the action hook load-$page (that runs at the very beginning of a page load) and check if the user meta is empty. If so, trigger the notice.
add_action( 'load-profile.php', 'notice_so_23373245' );
add_action( 'load-user-edit.php', 'notice_so_23373245' );
function notice_so_23373245()
{
// Check to see if page is user-edit or profile
$user = isset( $_GET['user_id'] ) ? $_GET['user_id'] : get_current_user_id();
if( empty( get_user_meta( $user, 'user_street' ) ) )
add_action('admin_notices', 'my_admin_notice');
}