Datasheet

Chapter 1: AJAX Technologies

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As you saw earlier, Listing 1-2 contains a JavaScript function named serialize that serializes a given

credentials object into a string with the following format before this object is sent over the wire to

the server:

usernametbx=username&passwordtbx=password

Listing 1-2 also contains a JavaScript function named deserialize that deserializes an employee object

from a string with the following format:

Shahram|Khosravi|22223333|Some Department|

The serialize and deserialize methods encapsulate the logic that was referred to as the Serializer in

Figure 1-2 .

The great thing about the XML format is that the server- and client-side technologies provide built-in

support for serializing objects into XML and deserializing objects from XML. Listing 1-3 presents a new

version of Listing 1-2 where the

Page_Load server-side method serializes the server data into XML,

which is then sent over the wire to the client, where the

deserialize JavaScript function deserializes an

employee object from the XML.

Listing 1-3: A version of Listing 1-2 that uses XML format

<%@ Page Language=”C#” %>

<%@ Import Namespace=”System.Xml” %>

<%@ Import Namespace=”System.IO” %>

<!DOCTYPE html PUBLIC “-//W3C//DTD XHTML 1.0 Transitional//EN”

“http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd”>

void Page_Load(object sender, EventArgs e)

{

if (Request.Headers[“MyCustomHeader”] != null)

{

if (Request.Form[“passwordtbx”] == “password” &&

Request.Form[“usernametbx”] == “username”)

{

string xml=””;

using (StringWriter sw = new StringWriter())

{

XmlWriterSettings settings = new XmlWriterSettings();

settings.Indent = true;

settings.OmitXmlDeclaration = true;

using (XmlWriter xw = XmlWriter.Create(sw, settings))

{

xw.WriteStartDocument();

xw.WriteStartElement(“employeeInfo”);

xw.WriteElementString(“firstName”, “Shahram”);

xw.WriteElementString(“lastName”, “Khosravi”);

xw.WriteElementString(“employeeId”, “22223333”);

xw.WriteElementString(“departmentName”, “Some Department”);

xw.WriteEndElement();

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