Attaching listener to selector, getting TypeError

Attaching listener to selector, getting TypeError

When I do this in the debugger, I get an object no problem:    $(".ui-column-filter").get(0)
However, when I try to use the same selector in the context below, 
I get this error: TypeError: $(...).get(...) is undefined
What am I doing wrong?  I tried with and without the ready.
Please advise.

<script>
$(document).ready(function () {
$(".ui-column-filter").get(0).keydown(function() { 
  updateTotals();
});
$(".ui-column-filter").get(1).keydown(function() {
  updateTotals();
});
$(".ui-column-filter").get(2).keydown(function() {
  updateTotals();
});
   });
</script>