Keyup function doesn't work

CodeIgniter url is  [ controller/method ].

Code:

<script>
var xTriggered = 0;
$( "#target" ).keyup(function( event ) {
  xTriggered++;
  var msg = "Handler for .keyup() called " + xTriggered + " time(s).";
  $.print( msg, "html" );
  $.print( event );
}).keydown(function( event ) {
  if ( event.which == 13 ) {
    event.preventDefault();
  }
});

$( "#other").click(function() {
  $( "#target" ).keyup();
});
</script>

What did you Try? What did you Get? What did you Expect?

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