title: PHP/HTML/JS: External file manager
body: <p>I feel like i am asking something easy but i'm running in circles.
  <br /><br />
  I am creating a form with various fields and i'd like to add a file field with an external file manager (<strong><em>first problem</em></strong>: which one? i'm looking into <strong>pydio</strong> but it seems overkill for the needs).<br />
  Here is the dumb question: <strong>How do i integrate it in the form?</strong><br />
  I'm quite sure it's an AJAX problem but i have no idea on how to integrate it. I assume i need to call some function onClick() to open the filemanager and there should be some callback to get/set the value on the form.
  <br/>
  Any hint&amp;code is welcome!</p>