<script type="text/xml-script"> <!-- Insert xml-script here --> </script> in .NET framework

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<script type="text/xml-script"> <!-- Insert xml-script here --> </script>
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As you can see, XML Script comments have the same syntax as XML comments. You can have multiple blocks of XML Script code in the same page, and they can appear in any order and position. Unlike JavaScript code, though, at the moment XML Script can only appear inline in the page and can t be saved to separate files. As with any programming language, a Hello, World! example is the ideal ice-breaker for introducing basic XML Script features. It s also a good starting point for learning how XML Script code is structured and to give you confidence with its syntax.
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11.1.1 Hello XML Script!
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This example shows how a block of XML Script code is structured and how you can deal with client objects using declarative code. You ll see how to handle an event raised by a client component using XML Script code. Normally, you d accomplish this task by retrieving a reference to the component and writing the necessary JavaScript code to add an event handler. Listing 11.2 shows how to declaratively hook up the init event raised by Sys.Application, the Application object introduced in chapter 2. As promised, the event handler is a JavaScript function that displays a Hello XML Script! message onscreen.
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XML Script
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Listing 11.2 Code for the Hello XML Script! example
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<%@ Page %> <!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 runat="server"> <title>Hello XML-script</title> </head> <body> <form id="form1" runat="server"> <asp:ScriptManager ID="TheScriptManager" runat="server"> <Scripts> <asp:ScriptReference Assembly="Microsoft.Web.Preview" Name="PreviewScript.js" /> </Scripts> </asp:ScriptManager> <script type="text/xml-script"> <page xmlns="http://schemas.microsoft.com/xml-script/2005"> <components> <application init="pageInit" /> Block of XML </components> Script code </page> </script> <script type="text/javascript"> <!-function pageInit() { alert("Hello XML Script!"); } //--> </script> </form> </body> </html>
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Let s have a closer look at the block of XML Script code B contained in the page. It has a root element called page and a single child element called components. The page element defines a global XML namespace associated with the following Uniform Resource Identifier (URI):
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http://schemas.microsoft.com/xml-script/2005
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The page/components structure is the basic form of an XML Script code block. All the blocks of XML Script code in the page must have this structure in order to be
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XML Script basics
parsed correctly. In section 11.1.5 we ll return to the use of XML namespaces with XML Script.
NOTE
An XML namespace is a collection of names, identified by a URI reference, used in XML documents as element types and attribute names. For more information on XML namespaces, check http://www.w3schools .com/ xml/xml_namespaces.asp.
The components tag always contains the list of client objects declared in the page. These objects are represented by XML elements and are instances of classes created with the Microsoft Ajax Library. In this chapter, we ll focus on client components, which are classes that derive from Sys.Component. The reason is that the XML Script engine already knows how to properly parse and instantiate such classes. If you recall, the creation process for a client component is rather elaborate, as we discussed in chapter 8. In listing 11.2, application is the unique child node of components. In XML Script as in the ASP.NET markup, for example a tag is mapped to a class, and the element represents an instance of that class. The application tag is always mapped to the Application object, stored in the global Sys.Application variable. When the XML Script parser processes the application tag, it retrieves a reference to the Application object. Then, it recognizes the init attribute as the name of an event raised by the Application object. As a consequence, its value pageInit is treated as the name of the event handler. The pageInit function declared in the JavaScript code block at the bottom of the page is invoked when the Application object raises the init event. This causes the greeting message to be displayed in a message box onscreen, as shown in figure 11.1.
Figure 11.1 The message displayed by a JavaScript function that handles the init event raised by Sys.Application. The init event is hooked up declaratively using XML Script code.
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