Using Server Controls in Atlas in Java

Draw Data Matrix in Java Using Server Controls in Atlas

CHAPTER
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Using Server Controls in Atlas
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his chapter follows on from 6, which introduced you to the Atlas server controls and showed you how to use them. In this chapter, you will look at several Atlas applications and will dissect them to see how they work. In the process, you will glean lots of new information about how to use the Atlas extensions to ASP .NET to build powerful Ajax-style applications and how to extend your existing applications with asynchrony. At the end of the chapter, you will look into the reference application that was built by Microsoft for Atlas the Atlas wiki. This application demonstrates how you can put together a powerful and high-performing application using many of the Atlas techniques.
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Using the UpdatePanel Control
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The first example uses the UpdatePanel control to show a partial refresh of a page. For this example, you will need a web form containing the HTML shown in Listing 7-1. Listing 7-1. Partially Refreshing a Page Using the UpdatePanel Control <%@ Page Language="C#" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> <script runat="server"> protected void btnCopy_Click(object sender, EventArgs e) { lblFirstLineShipping.Text = lblFirstLineBilling.Text; lblSecondLineShipping.Text = lblSecondLineBilling.Text; lblThirdLineShipping.Text = lblThirdLineBilling.Text; } </script> <html xmlns="http://www.w3.org/1999/xhtml" > <head id="Head1" runat="server"> <style type="text/css"> .start{background-color:yellow;border:dashed 2px black;} .hover{font-size:40pt;background-color:yellow;border:dashed 2px black;} </style>
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CHAPTER 7 s USING SERVER CONTROLS IN ATLAS
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<link href="intro.css" type="text/css" rel="Stylesheet" /> <title>ASP.NET "Atlas" Demo: UpdatePanel Control</title> </head> <body> <form id="form1" runat="server"> <div id="Div1" class="title"> <h2>ASP.NET "Atlas" Demo: Server-side Controls</h2> The following ASP.NET "Atlas" server-side controls are shown in this example: <ol> <li><atlas:UpdatePanel></li> </ol> </div> <div class="description"> <atlas:ScriptManager runat="server" ID="ScriptManager1" EnablePartialRendering="true" /> <hr /> <h3>Example 1: Atlas:UpdatePanel</u></h3> The UpdatePanel shown in this example updates the 'Shipping Address' once the 'Same As Billing Address' button is clicked. Notice that the page doesn't postback and the refresh happens without requiring to reload all the current content on the page.<br /> <br /> <strong> <span style="text-decoration: underline"> Billing Address </span>:<br /></strong> <asp:Label ID="lblFirstLineBilling" runat="server" Font-Bold="False" Text="One Microsoft Way,"></asp:Label><br /> <asp:Label ID="lblSecondLineBilling" runat="server" Text="Redmond,"></asp:Label><br /> <asp:Label ID="lblThirdLineBilling" runat="server" Text="WA - 98052"></asp:Label><br /> <br /> <atlas:UpdatePanel runat="server" ID="UpdatePanel1"> <ContentTemplate> <strong> <span style="text-decoration: underline"> Shipping Address</span>:</strong><br />
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CHAPTER 7 s USING SERVER CONTROLS IN ATLAS
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<asp:Label ID="lblFirstLineShipping" runat="server" Font-Bold="False"></asp:Label><br /> <asp:Label ID="lblSecondLineShipping" runat="server"></asp:Label><br /> <asp:Label ID="lblThirdLineShipping" runat="server"></asp:Label><br /> </ContentTemplate> </atlas:UpdatePanel> <br /> <asp:Button ID="btnCopy" runat="server" Text="Same As Billing Address" OnClick="btnCopy_Click" CausesValidation="False" /><br /> </div> </form> </body> </html> This page contains an UpdatePanel control whose content template contains three labels: lblFirstLineShipping, lblSecondLineShipping, and lblThirdLineShipping. When the user clicks the button, called btnCopy, the function btnCopy_Click gets called. As you can see in this function, the values of the labels outside the UpdatePanel control get copied into the labels inside. This triggers a partial refresh on the page, where the server updates only the contents of those three labels. If you run the page, you ll see a screen like that in Figure 7-1. Typically in an application like this, if you click the button to change the value of the shipping address labels, the entire page will be posted to and from the server. As the page is rerendered, the entire page will blink as the browser deletes the current markup and replaces it with the new one. With Ajax, you could place the shipping address content within a named <div> element, and then the click of the button could make a call to a JavaScript function that does the copy and builds a new innerHTML property of that <div> element. Or, if the functionality was server side, it would generate a request on XMLHttpRequest and a callback for when the request is complete. The callback would then build HTML code to put on the innerHTML property of the named <div> element. The latter is exactly how the Atlas UpdatePanel control works under the hood. It uses Web.WebForms.PageRequestManager to set up an asynchronous callback. If you use an HTTP sniffer and run the page in Listing 7-1, you will see the following markup at the bottom of the page: <script type="text/javascript"> Web.WebForms.PageRequestManager._setupAsyncPostBacks( document.getElementById('form1'), 'ScriptManager1', ['UpdatePanel1'], []); </script>
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