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    <p>A little late maybe, but I think this is a better solution... Will post for documentation/search purposes in case other people find this useful</p> <p>Note: you also need jQuery UI's Position element loaded in your UI build for this solution to work. </p> <p>In my example, I'm creating a set of draggable "coupons" which can be placed in various positions. Only one coupon can sit in any droppable area at a given time. </p> <p>In order to manage coupon assignment to droppable areas, I created some helper objects which I will use to extend the options object of the draggable &amp; droppable prototypes:</p> <pre><code>var dropObj = { hasCoupon: false, couponId: null } var couponObj = { dropId: null } </code></pre> <p>Then (on DOM ready) extend:</p> <pre><code>$.extend( $.ui.droppable.prototype.options, dropObj ); $.extend( $.ui.draggable.prototype.options, couponObj ); </code></pre> <p>Finally, setup your draggables &amp; droppables... When you're setting up the droppable use jquery UI's position helper to assist in swapping the draggables...</p> <pre><code>$('.selector').droppable({ drop: function( event, ui ) { var current, swapId; if ( $(this).droppable('option', 'hasCoupon') === false ) { // ... } else { current = $(this).droppable('option', 'couponId'); swapId = ui.draggable.draggable('option', 'dropId'); if ( swapId !== null ){ current.position({ my: "center", at: "center", of: swapId, using: function(to) { $(this).animate({ top: to.top, left: to.left }, ui.draggable.revertDuration, function() { swapId.droppable('option', 'hasCoupon', true); swapId.droppable('option', 'couponId', current); current.draggable('option', 'dropId', swapId); }); } }); } } $(this).droppable('option', 'hasCoupon', true); $(this).droppable('option', 'couponId', ui.draggable); ui.draggable.draggable('option', 'dropId', $(this)); ui.draggable.position({ my: "center", at: "center", of: $(this), using: function(to) { $(this).animate({ top: to.top, left: to.left }, 150 ); } }); } }); </code></pre> <p>Note: We're manually setting the values for couponId/dropId in the animation callback for the swap, since drag events are not actually firing in that situation (movement is handled via a jquery animation call instead).</p> <p>I played around with using .trigger() on dragstart/dragstop originally, but they didn't trigger the drop event as I assumed they should.</p>
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