CRM 2015 Javascript - CallBack Function On Save

Xrm.Page.data.save().then(successCallback, errorCallback);

function successCallback() {

    alert("Form saved !!!");

}

function errorCallback(saveErrorResponse) {

    if (saveErrorResponse != null) {

        if (saveErrorResponse.message != 'undefined' && saveErrorResponse.message != null) {

            alert("Error on Save – " + saveErrorResponse.message);

        }

    }

}