Jquery :: Won't Detect Input On Input Text

I am trying to get a alert box to popup each time a input text box is typed into. Here is the coding for the input text box:

This is in includes/search.php

Code:

<input type="search" name="search" id="search" class="search" autocomplete="off" />

And I am using JQuery to listen for it, here's my JQuery Code, I called it in and everything.

This is in js/jcode.js

Code:

$(document).ready(function(){
$("#search").onchange(function(event){
event.preventDefault();
alert("x");
});
});

And I am calling all: JQuery.js, jcode.js, search.php, into index.php to load it all