event.keycode

key down event

 
<html>
  <head>
    <script src="http://java2s.com/Book/JavaScriptDemo/jQuery/jquery-1.8.0.min.js"></script>
    <script type="text/javascript">
        $(document).ready(function(){
            $(window).keydown(function(event){
               alert(event.keyCode);
               switch (event.keyCode) {
               }
            });
        });
    </script>
  </head>
  <body>
    <body>
     <p><input type="text" /> <span>focus event fire</span></p>
    </body>
</html>

Click to view the demo

To perform an action when the escape key has been released

 
<html>
  <head>
    <script src="http://java2s.com/Book/JavaScriptDemo/jQuery/jquery-1.8.0.min.js"></script>
    <script type="text/javascript">
        $(document).ready(function(){
                $(document).keyup(function(event){
                     if (event.keyCode == 27) {
                        alert('escaped!');
                     }
                });
        });
    </script>
<style>
div.dbl { background:yellow;color:black; }
  
</style>
  </head>
  <body>
    <body>
         <p><input type="text" /> <span>focus fire</span></p>
        
        <p><input type="password" /> <span>focus fire</span></p>
    </body>
</html>

Click to view the demo

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