javascript - How do I simulate the behavior of a standard file field submit with an ajax post? -

due diligence

just clear have searched answer question , found these great questions unfortunately not me.

submit form including file upload via jquery ajax
jquery ajax submit form
jquery using ajax send data , save in php
jquery ajax submit form

setup

i have system pulling form values , posting them via ajax. simple snippet may like:

  // values   var url = '/ajax/my/controller'   var values = mystuff.getformvalues($form);    // post   $.post(url, values, function($response)   {     if ($response['status'])     {       // success     }     else     {       // validation error.     }   }, 'json'); 

my getformvalues functions runs custom processing make sure send information need keen on keeping it. similar jquery 'serialize' function simpler , custom processing.

the problem

my form values function $('selector').val() form values. not upload file fields. returns fake path c:\fakepat\filename.png. of course not work. need submit file part of ajax post operation.

the question

without switching jquery serialize (since doesn't support files anyway) , without using other libraries such jquery form, how obtain file file field , post using ajax?

simplified, how simulate behavior of standard file field submit ajax post?