[WordPress]

00-class-ajax-manager.php

<?php

namespace Acme\Admin;

class Ajax_Manager {

	public function register( $object, $method ) {

		add_action(
			"wp_ajax_$method",
			array( $object, $method )
		);

	}
}

01-acme-options-page.php

<?php

public function __construct( $ajax_manager ) {

  // If options exist, then use them; otherwise, initialize an empty array.
  $this->options =
	  get_option( 'acme-options' ) ?
	  get_option( 'acme-options' ) :
	  array();

  /* For this example, assume there is a default set of options called
   * `$default_options` that are used whenever no options are present
   * for the given options key above.
   *
   * Merge the arrays. The default options must go first so the existing
   * options override the default options.
   */
  $this->options = array_merge( $default_options, $this->options );

  /** 
   * Assume that the options are composed of key/value pairs and we're 
   * only using the event options.
   */
  $event_partial = new Views\Partials\Event( $this->options['event'] );

  // Tell the Ajax Messenger the event partial has an Ajax callback.
  $ajax_manager->register( $event_partial, 'the_taxonomies' );

}

02-submenu-page-init.php

<?php

$submenu = new Display\Submenu(
	new Display\Submenu_Page( new Admin\Ajax_Manager() )
);
$submenu->init();

03-event-ajax.js

var send_ajax_request = function( cpt_id ) {

	// Define the function and the data to send to the server.
	var data = {
		'action':    'the_taxonomies',
		'post_type': cpt_id
	};

	// Send the request to the server and handle the response.
	$.post( ajaxurl, data, function( response ) {
		// Handle your response here.
	});

};