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To demonstrate how an XmlReader can be obtained from an XPathNavigator, you need to build a Windows Forms application like the one shown in Figure 4-8.

Returns a map of name/value pairs of the parameters from the portlet request and the query string passed into the request dispatcher. The query string takes precedence. Returns the names of the parameters from the portlet request and the query string passed into the request dispatcher. Returns the values of the parameter from the portlet request and the query string passed into the request dispatcher. The query string takes precedence. Returns the path and query used to get the portlet s request dispatcher. Returns the path and query used to get the portlet s request dispatcher. Returns null. Returns the path and query used to get the portlet s request dispatcher. Returns null; does nothing. Returns null. Returns null. Returns null. Returns the login for the current user, or null if there is no login yet. Calls getRemoteUser() on the portlet s PortletRequest object. Same as Servlet 2.3 specification. Returns the request s session ID, or null if there is none. Calls getRequestedSessionId() on the portlet s PortletRequest object. Returns the path and query used to get the portlet s request dispatcher. Returns null. Returns the name of the URL scheme used to call the portlet. Calls getScheme() on the portlet s PortletRequest object. Returns the server s hostname. Calls getServerName() on the portlet s PortletRequest object.

function handleInput() { var T1 = document.getElementById("Text1"); var T2 = document.getElementById("Text2"); var theURL = "MultiplyAJAXServer.aspx nx=" + T1.value + "&ny=" + T2.value; ajaxRequest.open("GET", theURL); ajaxRequest.onreadystatechange = handleUpdate; ajaxRequest.send(); }

getParameterNames()

Figure 4-8. Obtaining XmlReader from XPathNavigator The application consists of a text box for entering the employee ID, a button, and nine labels. Upon clicking the Show button, the form displays the employee details on the form. Listing 4-8 shows the Click event handler of the Show button. Listing 4-8. Calling the ReadSubtree() Method private void button1_Click(object sender, EventArgs e) { XPathDocument doc=new XPathDocument(Application.StartupPath + @"\employees.xml"); XPathNavigator navigator = doc.CreateNavigator(); navigator.MoveToRoot(); navigator.MoveToFirstChild(); while (navigator.MoveToNext()) { navigator.MoveToFirstChild(); do { string id = navigator.GetAttribute("employeeid", ""); if (id == textBox1.Text) { XmlReader reader=navigator.ReadSubtree(); DisplayDetails(reader); } } while (navigator.MoveToNext()); } }

getParameterValues()

As you can see, this function gets a reference to each of the text boxes, and then uses their values to construct a URL to the server page. It then uses the open method on the ajaxRequest to set up an HTTP-GET to that URL, specifies the callback function (handleUpdate, which you ll see next), and starts the communication by calling send.

getPathInfo()

The code begins by creating an instance of XPathDocument. An XPathNavigator is then obtained by calling CreateNavigator(). Then the code iterates through the document. The navigation logic should be familiar to you because we used it in previous examples. With each iteration, the employeeid attribute is checked against the value supplied from the text box. If they match, the ReadSubtree() method of XPathNavigator is called. In this case, this returns an instance of XmlReader that contains one <employee> node and all its child nodes. The returned XmlReader is passed to a helper function called DisplayDetails(), shown in Listing 4-9. Listing 4-9. DisplayDetails() Helper Function private void DisplayDetails(XmlReader reader) { while (reader.Read()) { if (reader.NodeType == XmlNodeType.Element) { switch (reader.Name) { case "firstname": label6.Text = reader.ReadString(); break; case "lastname": label7.Text = reader.ReadString(); break; case "homephone": label8.Text = reader.ReadString(); break; case "notes": label9.Text = reader.ReadString(); break; } } } reader.Close(); } The DisplayDetails() function iterates through the supplied XmlReader object calling its Read() method. With each iteration, the values of the <firstname>, <lastname>, <homephone>, and <notes> nodes are retrieved by using the ReadString() method of the XmlReader class and assigned to the labels. Finally, the reader is closed by calling its Close() method.