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7 . . Run the page to see what happens . When you click the button that executes the long-running operation, you should see the UpdateProgress control show its content automatically . This graphic shows the UpdateProgress control in action:
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8 . . Finally, no asynchronous progress updating UI technology is complete without a means to cancel the long-running operation . If you wish to cancel the long-running operation, you can do so by inserting a little of your own JavaScript into the page . You need to do this manually because there s no support for this using the wizards . Write a client-side script block and place it near the top of the page inside the <head> tag . The script block should get the instance of the Sys.WebForms.PageRequestManager . The PageRequestManager class is available to the client as part of the script injected by the ASP .NET AJAX server-side controls . The PageRequestManager has a method named get_isInAsyncPostBack() that you can use to figure out whether the page is in the middle of an asynchronous callback (generated by the UpdatePanel) . If the page is in the middle of an asynchronous callback, use the PageRequestManager s abortPostBack() method to quit the request . Add a Button to the ProgressTemplate and assign its OnClientClick property to make a call to your new abortAsyncPostback method . In addition to setting the OnClientClick property to the new abort method, insert return false; immediately after the call to the abort method, as shown in the following code . (Inserting return false; prevents the browser from issuing a postback .)
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<%@ Page Language= C# AutoEventWireup= true CodeFile= UseUpdateProgressControl.aspx.cs Inherits= UseUpdateProgressControl %>
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<!DOCTYPE html PUBLIC ... > <html xmlns= http://www.w3.org/1999/xhtml > <head runat= server > <title></title> <script type= text/javascript > function abortAsyncPostback() { var obj = Sys.WebForms.PageRequestManager.getInstance(); if(obj.get_isInAsyncPostBack()) { obj.abortPostBack(); } } </script> </head> <body> <form id= form1 runat= server > <div> <asp:ScriptManager ID= ScriptManager1 runat= server > </asp:ScriptManager> </div> <asp:UpdateProgress ID= UpdateProgress1 runat= server AssociatedUpdatePanelID= UpdatePanelForProgress DisplayAfter= 100 > <ProgressTemplate> <asp:Label ID= Label1 runat= server Text= What s happening This takes a long time... > </asp:Label> <asp:Button ID= Cancel runat= server OnClientClick= abortAsyncPostback(); return false; Text= Cancel /> </ProgressTemplate> </asp:UpdateProgress> <asp:UpdatePanel ID= UpdatePanelForProgress runat= server > <ContentTemplate> This is from the update panel <asp:Button ID= ButtonLongOperation runat= server onclick= ButtonLongOperation_Click Text= Activate Long Operation /> </ContentTemplate> </asp:UpdatePanel> </form> </body> </html>
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Caution Caveat Cancel: As you can see, canceling an asynchronous postback is completely a
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client-side affair . Canceling a long-running operation on the client end is tantamount to disconnecting the client from the server . Once the client is disconnected from the server, the client will never see the response from the server . Also, although the client is happy that it could cancel the operation, the server might never know that the client canceled . So, the big caveat here is to plan for such a cancelation by making sure you program long-running blocking operations carefully so that they don t spin out of control . Although Microsoft Internet Information Services (IIS) 6 and IIS 7 should eventually refresh the application pool for such runaway threads, it s better to depend on your own good programming practices to make sure long-running operations end reasonably nicely .
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ASP .NET AJAX support provides a great infrastructure for managing partial-page updates and for setting up other events such as regular timer ticks . The next section looks at the ASP .NET AJAX extender controls .
Extender .Controls
The UpdatePanel provides a way to update only a portion of the page . That s pretty amazing . However, AJAX s compelling features have a very broad reach . One of the most useful features is the extender control architecture . Extender controls target existing controls to extend functionality in the target . Whereas controls such as the ScriptManager and the Timer do a lot in terms of injecting script code into the page as the page is rendered, the extender controls often manage the markup (HTML) in the resulting page . The following subsections discuss the ASP .NET AJAX extender controls . The first one is the AutoComplete extender .
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