How to pass Post_ID variable from theme’s Single.php to custom Plugin using AJAX

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I may be missing something in your code; but:

  1. you need to “move” the content of your test div to a JS variable that can then be used in your Ajax (or use the div value directly in your $.post.

    e.g. var postID = $('#test').val();

  2. then use it to pass the needed info to your server

    $.post( checkbox.ajaxurl, {
   action : 'submit_checkboxes',
   nonce : checkbox.nonce,
   thispost : postID,
   post : $(this).serialize()
  },
  function(response) {whatever... }
);

  3. in your PHP use say intval($_POST['thispost']) to obtain the post id and use accordingly.

Note: not tested & I tend to use jQuery.ajax with a data string of values instead of jQuery.post