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## observeOnce implementation Element.addMethods({ observeOnce: function(element, name, fn) { var wrapper = function(event) { this.stopObserving(name, wrapper) fn.call(this, event) } $(element).observe(name, wrapper) } }) ## usage draggable.observeOnce('mouseover', function(e) { new Draggable(draggable, { revert: true }) });

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