Question

In the following script, when del key is pressed it returns 46 instead of 127, which is the ASCII code of del key.

function countLength(evt) {
            var inp = (evt.which) ? evt.which : event.keyCode;
            alert (inp);
            return true;
}

Answer 1

Values returned by event.keyCode are not ASCII codes. They just indicate which key was pressed on the keyboard. For example pressing 0-key on the topmost row of the keyboard returns 48, but pressing 0 on numberblock returns 96.

To convert keycodes to ASCII , you have to use some kind of an array containing corresponding values. In this task you have to check all other keys pressed simultaneously, like shiftKey and altKey to have correct results.