Change color of past events in Fullcalendar - fullcalendar

Question

I'm trying to implement this solution to "grey out" past events in Fullcalendar, but I'm not having any luck. I'm not too well versed in Javascript, though, so I assume I'm making some dumb mistakes.
I've been putting the suggested code into fullcalendar.js, inside the call for daySegHTML(segs) around line 4587.
I added the first two lines at the end of the function's initial var list (Why not, I figured)—so something like this:
...
var leftCol;
var rightCol;
var left;
var right;
var skinCss;
var hoy = new Date;// get today's date
hoy = parseInt((hoy.getTime()) / 1000); //get today date in unix
var html = '';
...
Then, just below, I added the other two lines inside the loop:
for (i=0; i<segCnt; i++) {
seg = segs[i];
event = seg.event;
classes = ['fc-event', 'fc-event-skin', 'fc-event-hori'];
if (isEventDraggable(event)) {
classes.push('fc-event-draggable');
}
unixevent = parseInt((event.end.getTime()) / 1000); //event date in Unix
if (unixevent < hoy) {classes.push('fc-past');} //add class if event is old
if (rtl) {
if (seg.isStart) {
classes.push('fc-corner-right');
}
...
Running this code results in a rendered calendar with no events displayed and an error message: Uncaught TypeError: Cannot call method 'getTime' of null
The "null" being referred to is, apparently, event.end.getTime(). But I'm not sure I understand what exactly is going wrong, or how things are being executed. As written, it seems like it should work. At this point in the code, from what I can tell, event.end contains a valid IETF timecode, but for some reason it's "not there" when I try to run it through getTime()?
This isn't a mission-critical tweak for me, but would still be nice—and I'd like to understand what's going on and what I'm doing wrong, as well! Any help greatly appreciated!

Answer 1

If you are using FullCalendar2 with Google Calendar, you will need to use the version of the code below. This uses Moment.js to do some conversions, but since FC2 requires it, you'll be using it already.
eventRender: function(event, element, view) {
var ntoday = new Date().getTime();
var eventEnd = moment( event.end ).valueOf();
var eventStart = moment( event.start ).valueOf();
if (!event.end){
if (eventStart < ntoday){
element.addClass("past-event");
element.children().addClass("past-event");
}
} else {
if (eventEnd < ntoday){
element.addClass("past-event");
element.children().addClass("past-event");
}
}
}

Answer 2

As per FullCalendar v1.6.4
Style past events in css:
.fc-past{background-color:red;}
Style future events in css:
.fc-future{background-color:red;}

Answer 3

There's no need to fiddle with fullcalendar.js. Just add a callback, like:
eventRender: function(calev, elt, view) {
if (calev.end.getTime() < sometime())
elt.addClass("greyclass");
},
you just have to define the correct CSS for .greyclass.

Answer 4

Every event has an ID associated with it. It is a good idea to maintain your own meta information on all events based on their ids. If you are getting the events popupated from a backend database, add a field to your table. What has worked best for me is to rely on callbacks only to get the event ids and then set/reset attributes fetched from my own data store. Just to give you some perspective, I am pasting below a section of my code snippet. The key is to target the EventDAO class for all your needs.
public class EventDAO
{
//change the connection string as per your database connection.
//private static string connectionString = "Data Source=ASHIT\\SQLEXPRESS;Initial Catalog=amit;Integrated Security=True";
//this method retrieves all events within range start-end
public static List<CalendarEvent> getEvents(DateTime start, DateTime end, long nParlorID)
{
List<CalendarEvent> events = new List<CalendarEvent>();
// your data access class instance
clsAppointments objAppts = new clsAppointments();
DataTable dt = objAppts.SelectAll( start, end);
for(int i=0; i<dt.Rows.Count; ++i)
{
CalendarEvent cevent = new CalendarEvent();
cevent.id = (int)Convert.ToInt64(dt.Rows[i]["ID"]);
.....
Int32 apptDuration = objAppts.GetDuration(); // minutes
string staffName = objAppts.GetStaffName();
string eventDesc = objAppts.GetServiceName();
cevent.title = eventDesc + ":" + staffName;
cevent.description = "Staff name: " + staffName + ", Description: " + eventDesc;
cevent.start = (DateTime)dt.Rows[i]["AppointmentDate"];
cevent.end = (DateTime) cevent.start.AddMinutes(apptDuration);
// set appropriate classNames based on whatever parameters you have.
if (cevent.start < DateTime.Now)
{
cevent.className = "pastEventsClass";
}
.....
events.Add(cevent);
}
}
}
The high level steps are as follows:
Add a property to your cevent class. Call it className or anything else you desire.
Fill it out in EventDAO class while getting all events. Use database or any other local store you maintain to get the meta information.
In your jsonresponse.ashx, retrieve the className and add it to the event returned.
Example snippet from jsonresponse.ashx:
return "{" +
"id: '" + cevent.id + "'," +
"title: '" + HttpContext.Current.Server.HtmlEncode(cevent.title) + "'," +
"start: " + ConvertToTimestamp(cevent.start).ToString() + "," +
"end: " + ConvertToTimestamp(cevent.end).ToString() + "," +
"allDay:" + allDay + "," +
"className: '" + cevent.className + "'," +
"description: '" +
HttpContext.Current.Server.HtmlEncode(cevent.description) + "'" + "},";

Answer 5

Adapted from #MaxD The below code is what i used for colouring past events grey.
JS for fullcalendar pulling in Json
events: '/json-feed.php',
eventRender: function(event,element,view) {
if (event.end < new Date().getTime())
element.addClass("past-event");
},
other options ....
'event.end' in my Json is a full date time '2017-10-10 10:00:00'
CSS
.past-event.fc-event, .past-event .fc-event-dot {
background: #a7a7a7;
border-color: #848484
}

Answer 6

eventDataTransform = (eventData) => {
let newDate = new Date();
if(new Date(newDate.setHours(0, 0, 0, 0)).getTime() > eventData.start.getTime()){
eventData.color = "grey";
}else{
eventData.color = "blue";
}
return eventData;
}
//color will change background color of event
//textColor to change the text color

Answer 7

Adapted from #Jeff original answer just simply check to see if an end date exists, if it does use it otherwise use the start date. There is an allDay key (true/false) but non allDay events can still be created without an end date so it will still throw an null error. Below code has worked for me.
eventRender: function(calev, elt, view) {
var ntoday = new Date().getTime();
if (!calev.end){
if (calev.start.getTime() < ntoday){
elt.addClass("past");
elt.children().addClass("past");
}
} else {
if (calev.end.getTime() < ntoday){
elt.addClass("past");
elt.children().addClass("past");
}
}
}

Answer 8

Ok, so here's what I've got now, that's working (kind of):
eventRender: function(calev, elt, view) {
var ntoday = new Date();
if (calev.start.getTime() < ntoday.getTime()){
elt.addClass("past");
elt.children().addClass("past");
}
}
In my stylesheet, I found I needed to restyle the outer and inner elements to change the color; thus the elt.children().addclass addition.
The only time check I could get to work, lacking an end time for all day events, was to look at the start time - but this is going to cause problems with multi-day events, obviously.
Is there another possible solution?