WordPress how to add jquery to Moodle project

Solution:

First make sure that jquery is loaded on your page. Put this in your functions.php.

add_action('wp_enqueue_scripts', 'enqueue_my_files');
function enqueue_my_files(){
  wp_enqueue_script('jquery');
}

And in your javascript section, use this syntax to define $ and then write your jquery code inside it

jQuery(document).ready( function($){

  // you could put your jquery code in here!

});