I was trying to follow: Rails: submit (via AJAX) when drop-down option clicked
However none of these options appear to work (onsubmit, submit)
This is what I
Although rails overrides the default action and submits via AJAX when you add :remote => true, you are forcing the form to post the regular what in your onchange event.
You need to make your own function to submit via AJAX and call that from your onchange, using $.post() $.post() to send the form to the server.