How to save events in database with fullcalendar v4 - fullcalendar

Question

Before, I'm used Ajax to save events and it was ok. But now, with the v4, my code doesn't work anymore like if Ajax doesn't recognise anymore. Does someone have the solution ?
My code in v3.09
eventDrop: function(event, delta, revertFunc) { // Déplacement d'une événement
var date = new Date();
if (($.fullCalendar.formatDate(event.start, "M")>=date.getMonth()+1 && $.fullCalendar.formatDate(event.start, "D")>=date.getDate()) || ($.fullCalendar.formatDate(event.start, "M")>date.getMonth()+1)) {
$.ajax({
url: 'php/update_events.php',
data: 'title='+ event.title+'&start='+ $.fullCalendar.formatDate(event.start, "YYYY-MM-DD HH:mm:ss") +'&end='+ $.fullCalendar.formatDate(event.end, "YYYY-MM-DD HH:mm:ss") +'&id='+ event.id ,
type: "POST",
success: function(json) {
$('#script-info').show();
setTimeout('divOff()',1000);
}
});
} else {
alert ("Vous ne pouvez pas déplacer une absence à une date antérieure à la date du jour.");
revertFunc();
}
},
My code in v4
eventDrop: function(info) {
var date = new Date();
if (calendar.formatDate(info.event.start, {month: 'numeric'})>=date.getMonth()+1 && calendar.formatDate(info.event.start, {day: 'numeric'})>=date.getDate()) {
$.ajax({
url: 'php/update_events.php',
data: 'title="Test"',
type: "POST",
success: function(json) {
$('#script-info').show();
setTimeout('divOff()',1000);
}
});
alert('Ok');
} else {
alert('Vous ne pouvez pas déplacer un créneau de sport à une date antérieure à la date du jour.');
info.revert();
}
}

Answer 1

You give me the solution !
I've removed script src='lib/jquery.min.js' script.
How stupid i am ! So, it's works again. Sorry for the inconvenient

Answer 2

Not sure if this helps others, but if you want to save events via ajax in V4 this is what I did assuming calEvent is coming from sort of event (click, drag etc) in V4:
eventClick: function (calEvent) { var cloned= jQuery.extend(true, {},calendar.getEventById( calEvent.event.id ));
cloned.start=clientEvents[i].start;
cloned.end=clientEvents[i].end;
cloned.title=clientEvents[i].title
delete cloned.jsEvent;
delete cloned.view;
Above shows how you can clone the event (needs jquery) and then add custom properties, remove some unneeded properties and ultimately turn this into JSON to send back to server.
HTH