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The final piece of the puzzle is the callback. When you specify a callback function, the XMLHttpRequest object will call it four times, setting the readyState property to the values 1, 2, 3, and 4, respectively. These correspond to the following states: 1: Communication open 2: Message sent to server 3: Payload downloading from server 4: Payload download complete The responseText property contains the returned values from the server. So, if you are only interested in updating the page when the server has completed its operation and sent its payload, then check the readyState for the value 4. You can see this in action here:

getPathTranslated()

Note The position of XPathNavigator remains unaffected even after calling the ReadSubtree() method.

function handleUpdate() { var ansDiv = document.getElementById("ans"); if(ajaxRequest.readyState == 4) { ansDiv.innerHTML = ajaxRequest.responseText; } }

getProtocol() getQueryString()

getReader() getRealPath() getRemoteAddr() getRemoteHost() getRemoteUser()

This checks the readyState of the ajaxRequest, and when it is 4, it takes the responseText and loads it into the <div> element that is assigned to contain the answer. If you run this application, you can see the effect. As you type in the text boxes, the Ajax code will execute, calling the server and processing the return, loading it into the answer <div>, and giving a much more fluid user experience. Again, as this is a simple case (multiplying two numbers), you could argue that you don t need a server, and thus don t need Ajax but it indicates the methodology that you would use in a scenario where the mathematical functions may be too complex to do in JavaScript, or may involve proprietary algorithms, as is the case with many financial analytics calculations. You can see it in action in Figure 11-4.

Just as you can create an XmlReader from XPathNavigator, you can also create an XmlWriter from it. This is useful in situations where you want to write selected nodes from XPathNavigator to a file or stream. XPathNavigator provides a method called WriteSubtree() that accepts an XmlWriter and writes the current node to it. To illustrate the use of this technique, you need to develop an application like the one shown in Figure 4-9.

getRequestDispatcher() getRequestedSessionId()

The full listing for the client page is shown in Listing 11-3.

Figure 4-9. Obtaining an XmlWriter from XPathNavigator The application consists of two text boxes: one to accept the employee ID to be extracted, and the other to specify a file path where the extracted employee details are stored. Listing 4-10 shows the Click event handler of the Write button. Listing 4-10. Calling the WriteSubtree() 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)

getRequestURI()

getRequestURL() getScheme()

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head> <title>AJAX Multiplier Client</title> <script type="text/javascript"> var ajaxRequest function initAJAX() { try { ajaxRequest = new XMLHttpRequest(); } catch(error) { ajaxRequest = new ActiveXObject("Microsoft.XMLHTTP"); } } function handleInput() { var T1 = document.getElementById("Text1"); var T2 = document.getElementById("Text2"); var theURL = "MultiplyAJAXServer.aspx nx=" + T1.value + "&ny=" + T2.value;

{ XmlTextWriter writer = new XmlTextWriter(textBox2.Text, null); navigator.WriteSubtree(writer); writer.Close(); if (MessageBox.Show("Do you want to see the file ", "Question", MessageBoxButtons.YesNo) == DialogResult.Yes) { System.Diagnostics.Process.Start(textBox2.Text); } } } while (navigator.MoveToNext()); } } The code creates an instance of XPathDocument and XPathNavigator as before. It then starts navigating the document and finds the matching <employee> node. After the matching employee is found, the code creates an instance of XmlTextWriter (recollect that XmlTextWriter inherits from the XmlWriter abstract class), supplying the file path entered in the text box to the constructor. Though our example writes the data to a disk file, any writable stream can be used. To write the matching employee to XmlTextWriter, the code calls the WriteSubtree() method of XPathNavigator. The WriteSubtree() method accepts any class derived from the XmlWriter base class and writes the contents of the current node to it. In our example, it will be the <employee> node and its child nodes. After the writing is over, the XmlTextWriter is closed by calling its Close() method. The code then asks the user whether to open the resultant file, as shown in Figure 4-10.

getServerName() 128

ajaxRequest.open("GET", theURL); ajaxRequest.onreadystatechange = handleUpdate; ajaxRequest.send(); } function handleUpdate() { alert(ajaxRequest.readyState); var ansDiv = document.getElementById("ans"); if(ajaxRequest.readyState == 4) { ansDiv.innerHTML = ajaxRequest.responseText; } }

Table 5-1. The Methods on an HttpServletRequest Object in a Portlet (continued)