title: keypress function rus only with enter key (e.which==13)
body: <p>This is my first post here.
  After a few weeks reading and learning here I have a specific question:</p>
  
  <pre><code>$(document).keypress(function(e) {
    if (e.which == 13) { alert('Key press') }; 
  });
  </code></pre>
  
  <p>This runs perfectly; an alert box is shown.</p>
  
  <p>When I try with ESC (code 27) or any other key code, it doesn't run.
  Any suggestions?</p>