title: jQuery handling keypress combinations
body: <p>I know that when <code>keypress</code> event occurs then we can access which key is pressed by object's event property <code>keycode</code>, but I need to know how do we can handle <code>keypress</code> combinations through jQuery like <code>ctrl + D</code> ..etc? </p>
  
  <p>In the following code I tried to do something like :</p>
  
  <pre><code>$(document).on("keypress", function(e) { 
      if( /* what condition i can give here */ )           
          alert("you pressed cntrl + Del");
  });
  </code></pre>