cancel drag event from eventDragStart callback

I need to check some criteria in “eventDragStart” callback and if criteria doesn’t match then I need to cancel the drag event completely in “eventDragStart” callback itself, so event can’t be moved at all.

Unfortunately, canceling of drag event isn’t working with “eventDragStart” callback.

so something like this:

eventDragStart: function( event, jsEvent, ui, view ) { 
    // this would not allow event to be dragged
    if (bFlag) {
       return false;
    }
}

Can someone help me to cancel the drag-drop of event in “eventDragStart” callback?

I am using fullcalendar 3.7.0

[mashinax]

any updates regarding the “the ability to return false and cancel…” - I need this option for viewRender…

[HDinger]

Are there any news on this? Being able to cancel the drag is an essential functionality. Most users expect the drag to be cancelled when pressing ESCAPE and are wondering why nothing happens.