ajax request

(function (n) {
    n.Ajax = n.Ajax || {};

    n.Ajax.Request = function () {
        this.url = "/";
        this.requestDataType = "application/json";
        this.responseDataType = "application/json";
        this.successCallback = null;
        this.internalErrorCallback = null;
        this.notFoundCallback = null;
        this.badRequestCallback = null;

        this.for = function (url) {
            this.url = url;

            return this;
        };

        this.onSuccess = function (callback) {
            this.successCallback = callback;

            return this;
        };

        this.onInternalError = function (callback) {
            this.internalErrorCallback = callback;

            return this;
        };

        this.onNotFound = function (callback) {
            this.notFoundCallback = callback;

            return this;
        };

        this.onBadRequest = function (callback) {
            this.badRequestCallback = callback;

            return this;
        };

        this.sending = function (mime) {
            this.requestDataType = mime;

            return this;
        };

        this.sendingJson = function () {
            this.requestDataType = "application/json";

            return this;
        };

        this.expecting = function (mime) {
            this.requestDataType = mime;

            return this;
        };

        this.expectingHtml = function () {
            this.requestDataType = "text/html";

            return this;
        };

        this.expectingJson = function () {
            this.responseDataType = "json";

            return this;
        };

        this.run = function (httpMethod, data) {
            var doNothing = function () {
            };

            $.ajax({
                url: this.url,
                type: httpMethod,
                contentType: this.requestDataType,
                data: data,
                dataType: this.responseDataType,
                success: this.successCallback,
                statusCode: {
                    400: this.badRequestCallback || doNothing,
                    404: this.notFoundCallback || doNothing,
                    500: this.internalErrorCallback || doNothing
                }
            });
        };

        this.get = function (data) {
            this.run("GET", data);
        };

        this.post = function (data) {
            this.run("POST", data);
        };
    };
}(nlib));