jquery-src/jquery.calendars.picker.js
function(event) {
			var inst = plugin._getInst((event.data && event.data.elem) || event.target);
			if (!$.isEmptyObject(inst) && inst.options.constrainInput) {
				var ch = String.fromCharCode(event.keyCode || event.charCode);
				var allowedChars = plugin._allowedChars(inst);
				return (event.metaKey || inst.ctrlKey || ch < ' ' ||
					!allowedChars || allowedChars.indexOf(ch) > -1);
			}
			return true;
		}
function(event) {
			var inst = plugin._getInst((event.data && event.data.elem) || event.target);
			if (!$.isEmptyObject(inst) && inst.options.constrainInput) {
				var ch = String.fromCharCode(event.keyCode || event.charCode);
				var allowedChars = plugin._allowedChars(inst);
				return (event.metaKey || inst.ctrlKey || ch < ' ' ||
					!allowedChars || allowedChars.indexOf(ch) > -1);
			}
			return true;
		}
function ( event ) { var inst = plugin . _getInst ( ( event . data && event . data . elem ) || event . target ) ; if ( ! $ . isEmptyObject ( inst ) && inst . options . constrainInput ) { var ch = String . fromCharCode ( event . keyCode || event . charCode ) ; var allowedChars = plugin . _allowedChars ( inst ) ; return ( event . metaKey || inst . ctrlKey || ch < ' ' || ! allowedChars || allowedChars . indexOf ( ch ) > - 1 ) ; } return true ; }
Filter keystrokes in the datepicker.
@memberof CalendarsPicker
@private
@param event {KeyEvent} The keystroke.
@return {boolean} <code>true</code> if allowed, <code>false</code> if not allowed.
Filter keystrokes in the datepicker .