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function isNumericKeyCode(keyCode) {
    return (event.keyCode >= 48 && event.keyCode <= 57)
        || (event.keyCode >= 96 && event.keyCode <= 105);
}
function isForwardSlashKeyCode(keyCode) {
    return event.keyCode === 191;
}
function isNavigationKeycode(keyCode) {
    switch (keyCode) {
        case 8: //backspace
        case 35: //end
        case 36: //home
        case 37: //left
        case 38: //up
        case 39: //right
        case 40: //down
        case 45: //ins
        case 46: //del
            return true;
        default:
            return false;
    }
}