Fullcalendar- Show textbox when date is selected

What I currently have is a prompt where we enter the name of the event when the date is selected:

select: function (start, end, allDay)
                        {
                            /*
                             after selection user will be promted for enter title for event.
                             */

                            var title = prompt("Titulo do Evento");

What I want is instead of a prompt, a hidden textbox appears on the page itself and I enter the name there. The examples I found use functions that activate the textbox's if a checkbox is selected for example. But as with the calendar here, I do not know how I can do it.