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Figure 29-2. An automated progress meter To test the page processor, you simply need to use a target page that takes a long time to execute on the server (because of the work performed by the code) or to be downloaded in the client (because of the size of the page). You can simulate a slow page by placing the following time delay code in the target page: protected void Page_Load(object sender, System.EventArgs e) { // Simulate a slow page loading (wait ten seconds). System.Threading.Thread.Sleep(10000); }

As you can see, with just a small amount of client-side JavaScript code, you can keep the user informed that a page is processing. By keeping users informed, the level of perceived performance increases.

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The previous example demonstrated how JavaScript can help you create a more responsive interface This advantage isn t limited to page processors You can also use JavaScript to download time-consuming portions of a page in the background Often, this requires a little more work, but it can provide a much better user experience For example, consider a case where you re displaying a list of records in a GridView One of the fields displays a small image This technique, which was demonstrated in 10, requires a dedicated page to retrieve the image, and, depending on your design, it may require a separate trip to the file system or database for each record In many cases, you can optimize this design (for example, by preloading images in the cache before you bind the grid), but this isn t possible if the images are retrieved from a third-party source.

This is the case in the next example, which displays a list of books and retrieves the associated images from the Amazon website Rendering the full table can take a significant amount of time, especially if it has a large number of records You can deal with this situation more effectively by using placeholder images that appear immediately The actual images can be retrieved in the background and displayed once they re available The time required to display the complete grid with all its pictures won t change, but the user will be able to start reading and scrolling through the data before the images have been downloaded, which makes the slowdown easier to bear The first step in this example is to create the page that displays the GridView.

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For the purposes of this example, the code fills a DataSet with a static list of books from an XML file protected void Page_Load(object sender, SystemEventArgs e) { if (!PageIsPostBack) { // Get data DataSet ds = new DataSet(); dsReadXml(ServerMapPath("Booksxml")); GridView1DataSource = dsTables["Book"]; GridView1DataBind(); } } Here s the content of the XML file: < xml version="10" encoding="utf-8" > <Books> <Book Title="Expert C# Business Objects" isbn="1590593448" Publisher="Apress"></Book> <Book Title="C# and the NET Platform" isbn="1590590554" Publisher="Apress"></Book> <Book Title="Beginning XSLT" isbn="1590592603" Publisher="Apress"></Book> <Book Title="SQL Server Security Distilled" isbn="1590592190" Publisher="Apress"></Book> </Books> As you can see, the XML data doesn t include any picture information Instead, these details need to be retrieved from the Amazon website The GridView binds directly to the columns that are available (Title, isbn, and Publisher) and then uses another page (named GetBookImage.

aspx) to find the corresponding image for this ISBN..

Here s the GridView control tag without the style information: <asp:GridView id="GridView1" runat="server" AutoGenerateColumns="False"> <Columns> <asp:BoundField DataField="Title" HeaderText="Title"/> <asp:BoundField DataField="isbn" HeaderText="ISBN"/> <asp:BoundField DataField="Publisher" HeaderText="Publisher"/> <asp:TemplateField> <HeaderTemplate> Book Cover </HeaderTemplate> <ItemTemplate> <img src="UnknownBookgif" onerror="javascript:thissrc='Unknownbookgif'" onload= "javascript:thissrc='GetBookImageaspx isbn= <%# Eval("isbn") %>';"> </ItemTemplate> </asp:TemplateField> </Columns> </asp:GridView> The innovative part is the last column, which contains an <img> tag Rather than pointing this tag directly to GetBookImageaspx, the src attribute is set to a local image file (UnknownBookgif), which can be quickly downloaded and displayed Then the onLoad event (which occurs as soon as the UnknownBookgif image is first displayed) begins downloading in the background the real image from the GetBookImageaspx page When the real image is retrieved, it s displayed, unless an error occurs during the download process The onError event is handled in order to ensure that if an error occurs, the UnknownBook.

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