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<td>This animated GIF won't pause, demonstrating that your page isn't posting back to the server.</td> </tr> </table> <br /><br /> Value 1:  <asp:TextBox ID="txt1" runat="server" onKeyUp="CallServerForUpdate();" /><br /> Value 2:  <asp:TextBox ID="txt2" runat="server" onKeyUp="CallServerForUpdate();" /><br /><br /> <asp:Label ID="lblResponse" runat="server" ... /> </div> </form> </body> </html> The CreateXMLHttpRequest() function uses the technique you saw earlier to instantiate the appropriate version of the XMLHttpRequest object: var XmlRequest; function CreateXMLHttpRequest() { try { // This works if XMLHttpRequest is part of JavaScript. xmlRequest = new XMLHttpRequest(); } catch(err) { // Otherwise, the ActiveX object is required. xmlRequest = new ActiveXObject("Microsoft.XMLHTTP"); } } The CallServerForUpdate() function finds the text box objects, grabs their current values, and uses them to build a URL that points to the HTTP handler. The code then sends an asynchronous GET request to the HTTP handler. function CallServerForUpdate() { var txt1 = document.getElementById("txt1"); var txt2 = document.getElementById("txt2"); var url = "CalculatorCallbackHandler.ashx value1=" + txt1.value + "&value2=" + txt2.value; xmlRequest.open("GET", url); xmlRequest.onreadystatechange = ApplyUpdate; xmlRequest.send(); } Finally, the ApplyUpdate() function runs when the response is received. Assuming no error occurred, the new information is parsed out of the returned text and used to create a message that s displayed in the label:

time you posted back to the web server, any and all information you previously entered (such as the items you wished to purchase) were discarded. When you wish to remember information regarding the users who are logged on to your site, you need to make use of various state management techniques.

Note This issue is in no way limited to ASP.NET. Java web applications, CGI applications, classic ASP applications, and PHP applications all must contend with the thorny issue of state management.

function ApplyUpdate() { // Check that the response was received successfully. if (xmlRequest.readyState == 4) { var lbl = document.getElementById("lblResponse"); var response = xmlRequest.responseText; if (response == "-") { lbl.innerHTML = "You've entered invalid numbers."; } else { var responseStrings = response.split(","); lbl.innerHTML = "The server returned the sum: " + responseStrings[0] + " at " + responseStrings[1]; } } }

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To remember the value of the userFavoriteCar string type between postbacks, one approach is to store the value of this string type in a session variable. We will examine the details of session state in the pages that follow. For the sake of completion, however, here are the necessary updates for the current page (note that you are no longer using the private string member variable, so feel free to comment out or remove the definition altogether): public partial class _Default : System.Web.UI.Page { // State data // private string userFavoriteCar = "Yugo"; protected void Page_Load(object sender, EventArgs e) { } protected void btnSetCar_Click(object sender, EventArgs e) { // Store value to be remembered in session variable. Session["UserFavCar"] = txtFavCar.Text; } protected void btnGetCar_Click(object sender, EventArgs e) { // Get session variable value. lblFavCar.Text = (string)Session["UserFavCar"]; } } If you now run the application, the value of your favorite automobile will be preserved across postbacks, thanks to the HttpSessionState object manipulated indirectly by the inherited Session property.

It s worth pointing out that Ajax doesn t save you from any server round-trips, and it rarely reduces the server processing time. The real difference is that round-trips occur silently in the background, which gives the application a more responsive feel.

ASP.NET provides several mechanisms you can use to maintain stateful information in your web applications. Specifically, you can: Use ASP.NET view state. Use ASP.NET control state. Define application-level data. Use the cache object. Define session-level data. Define cookie data.

public class AddUserServlet extends ServletBase {

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