Implement Keyboard Shortcut Keys using Javascript

document.onkeydown = KeyDownHandler;

      document.onkeyup = KeyUpHandler;

 

        var CTRL = false;      

        var SHIFT = false;     

        var ALT = false;

        var CHAR_CODE = -1;

 

        function KeyDownHandler(e)

        {

            var x = '';

            if (document.all)

            {

                var evnt = window.event;

                x = evnt.keyCode;

            }

            else

            {

                x = e.keyCode;

            }

            DetectKeys(x, true);

           

        }

       

        function KeyUpHandler(e)

        {

            var x = '';

            if (document.all)

            {

                var evnt = window.event;

                x = evnt.keyCode;

            }

            else

            {

                x = e.keyCode;

            }

            DetectKeys(x, false);

        }

 

        function DetectKeys(KeyCode, IsKeyDown)

        {           

            if (KeyCode == '16')

            {

                SHIFT = IsKeyDown;

            }

            else if (KeyCode == '17')

            {

                CTRL = IsKeyDown;

            }

            else if (KeyCode == '18')

            {

                ALT = IsKeyDown;

            }

            else

            {

                if(IsKeyDown)

                    CHAR_CODE = KeyCode;

                else

                    CHAR_CODE = -1;

            }

           

            var item;

      

           

            if(CTRL && ALT && KeyCode == "82")

            {

                //Code here

              }

            else if(CTRL && ALT && KeyCode == "83")

            {

                //Code here

            }

            else if(CTRL && ALT && KeyCode == "79")

            {

                //Code here

            }