These docs are for an old release. Info on upgrading to v4
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Triggered when resizing stops and the event has changed in duration.

function( event, delta, revertFunc, jsEvent, ui, view ) { }

event is an Event Object that hold the event’s information (date, title, etc).

delta is a Duration Object that represents the amount of time the event’s start or end was extended or reduced by.

revertFunc is a function that, if called, reverts the event’s end date to the value before the drag. This is useful if an ajax call should fail.

jsEvent holds the jQuery event with low-level information such as mouse coordinates.

ui holds an empty object. Before version 2.1, the jQuery UI object.

view holds the current View Object.

Here is an example demonstrating most of these arguments:

  events: [
    // events here
  editable: true,
  eventResize: function(event, delta, revertFunc) {

    alert(event.title + " end is now " + event.end.format());

    if (!confirm("is this okay?")) {