Vue.directive('select2', {
    twoWay: true,
    inserted: function (el) {
        $(el).select2()
            .on("select2:select", function(e) {
                alert($(el).val());
               // this.set($(el).val());
            }.bind(this));
    },
    update: function(nv, ov) {
        $(this.el).trigger("change");
    }
});