SO jQuery Fiddle

Test Fiddle mainly for SO Questions jQuery 1.4.3, UI 1.8.5

by Nick Craver

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.5/themes/ui-lightness/jquery-ui.css">
<input type="text" id="txt_name"  />

JavaScript

$(document).ready(function(){
  $("#txt_name").keyup(function(){
    alert(this.value);
  });
});