JS code

sendGrid.js

SendGridClient.prototype.send = function (message, parameters) {
    var deferred = when.defer(),
        guid = this.guidGen(),
        sendGrid = this._sendGrid;

    when(parameters,
        function (parameters) {

            var email = new SendGridEmail(parameters);
            if (message.get("categories")) {
                var categories = message.get("categories");
                for (var cat_id = 0; cat_id < categories.length; cat_id += 1) {
                    email.addCategory(categories[cat_id]);
                }
            }
            sendGrid.send(email,
                function (success, errMessage) {
                    if (!success) {
                        deferred.reject({"error": errMessage, "action": "postpone"});
                    } else {
                        deferred.resolve(guid);
                    }
                }
            );
        },
        function (error) {
            deferred.reject(error);
        }
    );


    return deferred.promise
};