JS: How to detect whether cursor is in textfield

Question

I want to use some letters ( keys ) as shortcut for some actions in javascript. I want to check whether the cursor is focused on any textfield, form input, etc. so that the shortcut action will be canceled when user is typing something in a form or textfield.

For example, i want an alert() to be executed when user presses 'A'. But if the user is typing some text in a textarea like 'A website' then he will be pressing 'A', this time alert() should not be executed.

Answer 1

$(document).keydown( function( e ) { 
  if( e.target.nodeName == "INPUT" || e.target.nodeName == "TEXTAREA" ) return;
  if( e.target.isContentEditable ) return;

  // Do stuff 
}

Answer 2

window.onkeydown = function(e){
  if ( e.target.nodeName == 'INPUT' ) return;

  handle_shortcut();
};