> ClientEvents > ExtEvents > OnKeydown
var ok =
event.keyCode == 8 || //backspace
event.keyCode == 9 || //tab
event.keyCode == 13 || //enter
event.keyCode >= 35 && event.keyCode <= 37 || //end, home, left arrow
event.keyCode == 39 || //right arrow, downd arrow, insert, delete
event.keyCode == 45 || //insert
event.keyCode == 46 || //delete
event.keyCode >= 96 && event.keyCode <= 105 || // 0-9 on keypad
event.keyCode >= 48 && event.keyCode <= 57; // 0-9
if (!ok) {
e.preventDefault();
}