If the user holds down the key, multiple keydown events are fired. For usability reasons I need to use keydown, not keyup, but I want to avoid this situation. My relevant code is the following:

$(document).keydown(function(e) { 

        var key = 0;





        if (e == null) { key = event.keyCode;}  

        else {  key = e.which;} 





        switch(key) {

            case config.keys.left:                

              goLeft();

              break;

            case config.keys.up:                        

              goUp();

              break;

            case config.keys.right:                     

              goRight();

              break;

            case config.keys.down:                

              goDown();

              break;

            case config.keys.action:              

              select();

              break;

        }     

      });

So when the user holds down the down key, for example, goDown() is fired multiple times. I would like it to fire just once even if the user holds the key down.