gistfile1.js

function boolSet(attr) {
	return function(state) {
		!!state ? this.setAttribute(attr, null) : this.removeAttribute(attr);
	}
}

function boolGet(attr) {
	return function() {
		return typeof this.getAttribute(attr) != 'undefined';
	}
}

xtag.register('x-dragbox', {
	accessors: {
		sortable: {
			get: boolGet('sortable'),
			set: boolSet('sortable')
		},
		droppable: {
			get: boolGet('droppable'),
			set: boolSet('droppable')
		}
	}
});