javascript - I can't change my database with ajax and a button -

i'm new ajax , jquery, might simple problem. i'd update database clicking on button within browser, using codeigniter framework.

my javascript looks this:

function endonboard(){ $.ajax({ url: "http://localhost:8888/users/onboard", success: function(data) {    } }); }

my html looks button this:

<button onclick="endonboard();">end</button>

and new php page onboard.php this:

<?php  $query_onboard = $this->db->query("update users set firstsignup = 42  user_id=". $this->user_id);  ?>

wiki

tL