For any UI plugin that can be disabled, in addition to two convenience methods (enable, disable), there should be an option: disabled, available at init, with a getter and setter. Ex:

$(el).draggable({disabled: true});

assert($(el).data("disabled.draggable") == true);

$(el).data("enable");

assert($(el).data("disabled.draggable") == false);

$(el).data("disable");

assert($(el).data("disabled.draggable") == true);