Why is keydown triggering but keyup is not?

Question

$(document).on('keydown', function(e) {
     if (e.shiftKey) {
          $('body').append('test1');
     }
});
$(document).on('keyup', function(e) {
     if (e.shiftKey) {
          $('body').append('test');
     }
});

keyup never triggers for me but keydown does, why is that?

Answer 1

event.shiftKey always return false on keyup.

Check for keyCode === 16 instead (which is the shift key code, on keyup):

$(document).on('keydown', function(e) {
     if (e.shiftKey) {
          $('body').append('test1');
     }
}).on('keyup', function(e) {
     if (e.keyCode === 16) {
          $('body').append('test');
     }
});

Demo: http://jsfiddle.net/maniator/eyX5N/