Summary

Here are all the example code snippets from the preceding discussion, assembled into two complete code pages: one for jQuery and the other for PHP.

PHP

This code resides on one of your plugin pages.

add_action( 'admin_enqueue_scripts', 'my_enqueue' );
function my_enqueue( $hook ) {
if ( 'myplugin_settings.php' !== $hook ) {
return;
}
wp_enqueue_script(
'ajax-script',
plugins_url( '/js/myjquery.js', __FILE__ ),
array( 'jquery' ),
'1.0.0',
true
);
$title_nonce = wp_create_nonce( 'title_example' );
wp_localize_script(
'ajax-script',
'my_ajax_obj',
array(
'ajax_url' => admin_url( 'admin-ajax.php' ),
'nonce' => $title_nonce,
)
);
}

add_action( 'wp_ajax_my_tag_count', 'my_ajax_handler' );
function my_ajax_handler() {
check_ajax_referer( 'title_example' );
update_user_meta( get_current_user_id(), 'title_preference', $_POST['title'] );
$args = array(
'tag' => $_POST['title'],
);
$the_query = new WP_Query( $args );
echo $_POST['title'] . ' (' . $the_query->post_count . ') ';
wp_die(); // all ajax handlers should die when finished
}

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jQuery

This code is in the file js/myjquery.js below your plugin folder.

jQuery(document).ready(function($) { 	   //wrapper
	$(".pref").change(function() { 		   //event
		var this2 = this; 		           //use in callback
		$.post(my_ajax_obj.ajax_url, { 	   //POST request
	       _ajax_nonce: my_ajax_obj.nonce, //nonce
			action: "my_tag_count",        //action
	  		title: this.value 	           //data
  		}, function(data) {		           //callback
			this2.nextSibling.remove();    //remove the current title
			$(this2).after(data); 	       //insert server response
		});
	});
});

And after storing the preference, the resulting post count is added to the selected title.

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