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Editorial Team
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Asked: 2026-05-31T18:24:29+00:00

I have set up FullCalendar to accept drops, which it does. But the draggable

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I have set up FullCalendar to accept drops, which it does. But the draggable object, which I have constructed with revert:’invalid’ does not seem to recognize the dates on FullCalendar as droppable, and reverts back. Here is my code:

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html><head>

  <meta content="text/html; charset=ISO-8859-1" http-equiv="content-type">
  <title>mydrag</title>
  <script src="fullcalendar-bundle.js" type="text/javascript"></script>
</head><body>
<div id="mydrag" style="width: 200px; height: 100px; background-color: red;">My Drag</div>
<div id="calendar"></div>


<script type="text/javascript">
function onExternalEventDrop(date, allDay) {
    alert("Dropped on " + date + " with allDay=" + allDay);
}

$('#mydrag').each(function() {

    // create an Event Object (http://arshaw.com/fullcalendar/docs/event_data/Event_Object/)
    // it doesn't need to have a start or end
    var eventObject = {
        title: 'MyDrag Title'
    };

    // store the Event Object in the DOM element so we can get to it later
    $(this).data('eventObject', eventObject);

    // make the event draggable using jQuery UI
    $(this).draggable({
        helper: 'clone',
        //revert: 'invalid',
        revert: function(droppableObj) {
            //if false then no socket object drop occurred.
            if(droppableObj === false) {
                //revert the .myselector object by returning true
                alert('Not a droppable object');
                return true;
            }
            else {
                //droppableObj was returned,
                //we can perform additional checks here if we like
                //alert(droppableObj.attr('id')); would work fine
                //return false so that the .myselector object does not revert
                return false;
            }
         },
        revertDuration: 500,  //  original position after the drag
        start: function(e, ui) {
            $(ui.helper).css('width', $(this).css('width'));
        }
    });

});

$('#calendar').fullCalendar({
    aspectRatio: 2.25,
    header: {
        left: '',
        center: 'title',
        right: 'prev,next'
    },
    columnFormat: {
        month: 'dddd'
    },
    droppable: true,
    drop: onExternalEventDrop
});

</script>
</body></html>

When I drag the draggable element onto the calendar, the element reverts back (suggesting that the calendar date was not recognized as a valid droppable)….but the drop callback is triggered with the expected alert (suggesting that FullCalendar recognized the draggable as valid). I would expect that the draggable should not revert back. Am I doing or expecting something wrong? I have searched all over, but not found anything to explain this. Any help would be greatly appreciated.

Update: Forgot to mention, what I have called “fullcalendar-bundle.js” is a file containing the following:

  • jquery 1.5.2
  • jquery ui 1.8.11
  • fullcalendar 1.5.2 plugin

Another update: I have just tried the FullCalendar 1.5.3 release, but see the same behavior.

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1 Answer

  1. Editorial Team

    This may help you:

    working version of drag and drop : http://jsfiddle.net/wkKfB/15/

    Solution for dragobj = false is that you need to bind droppable event to the calendar so that draggable knows what DOM object is droppable see working example here: http://jsfiddle.net/CZQkm/3/ && http://jsfiddle.net/DEsdN/12/
    *Until here

    (Your version but with some tweaks. By the way I have jsfiddl-ed your issue here: http://jsfiddle.net/wkKfB/16/) (issue was binding the external event)

    Good documentation reside here: http://arshaw.com/fullcalendar/docs/dropping/droppable/

    Issue was you need to externally add these drag event.

    You can change the css and make it to your use.

    Quote *[From the documentation above around external drag and drop.]* http://arshaw.com/fullcalendar/docs/dropping/droppable/

    >     How can I use this to add events???
>     
>     Good question. It is a common need to have an "external list of events" that can be dragged onto the calendar.
>     
>     While the droppable option deals with generic jQuery UI draggables and is not specifically tailored to adding events, it is possible to
> achieve this with a few lines of code. Follow the
> external-dragging.html example in FullCalendar's download. You can
> also view the example online.
>     
>     In short, you must call renderEvent yourself in the drop callback.

    another link: http://arshaw.com/js/fullcalendar-1.5.3/demos/external-dragging.html

    To capture the external event you need to add this code but the sample above has all set for you and should be clear 

     /* initialize the external events
    -----------------------------------------------------------------*/
$('#external-events div.external-event').each(function() {

    // create an Event Object (http://arshaw.com/fullcalendar/docs/event_data/Event_Object/)
    // it doesn't need to have a start or end
    var eventObject = {
        title: $.trim($(this).text()) // use the element's text as the event title
    };

    // store the Event Object in the DOM element so we can get to it later
    $(this).data('eventObject', eventObject);

    // make the event draggable using jQuery UI
    $(this).draggable({
        zIndex: 999,
        revert: true,      // will cause the event to go back to its
        revertDuration: 0  //  original position after the drag
    });

});


/* initialize the calendar
-----------------------------------------------------------------*/
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