XML Script in .NET framework

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XML Script
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The page still includes some JavaScript code, but you were able to perform the logic for attaching the event handler using only declarative code. Later, you ll see how to make the JavaScript code disappear. So far, you know how to access the Application object using XML Script. Usually, a rich web application hosts multiple components and even controls associated with DOM elements. Can you access them in declarative code and hook up their events The answer is that all the kinds of client components can be instantiated and accessed using XML Script.
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As you may have noticed while typing the first listing in Visual Studio, code completion isn t available at the moment for XML Script. In addition, no support is provided for debugging XML Script code and for the Visual Studio Designer. As we said in the introduction, XML Script is part of the ASP.NET Futures package and is still under development.
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11.1.2 Controls and XML Script
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In chapter 8, we introduced client controls and promised that they would be useful when dealing with XML Script. Client controls, when created as element wrappers, are the way to reach DOM elements using XML Script. An element wrapper is a control associated with a DOM element. As a wrapper, the client control exposes properties, methods, and events to deal with the associated element and enhance its functionality. As a client component, a control can be used in XML Script with little effort. The Microsoft Ajax Library ships with a collection of ready-to-use controls associated with the most-used DOM elements, such as labels and input elements. Listing 11.3 is a slight variation on listing 11.2. It uses a button and a label to display the greeting message, instead of accessing the Application object.
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Listing 11.3 Using the Label and Button controls in XML Script
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<div> <input type="button" id="greetButton" value="Click Me" /> </div> Label <div> element <h1><span id="msgLabel"></span></h1> </div>
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Button element
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<script type="text/xml-script"> <page xmlns="http://schemas.microsoft.com/xml-script/2005"> <components> <label id="msgLabel" /> <button id="greetButton" click="onGreetButtonClick" /> </components> Button </page> component </script>
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Label component
XML Script basics
<script type="text/javascript"> <!-function onGreetButtonClick(sender, e) { $find('msgLabel').set_text('Hello XML-script!'); } //--> </script>
The page s HTML contains an input B and a span C element. The goal is to display a message in the label when the button is clicked. To accomplish this task, you don t access the DOM elements directly. Instead, you deal with the corresponding controls, represented by the label D and button E elements in the XML Script code. Note that the value of their id attributes is set to the IDs of the DOM elements; this way, you associate the DOM elements with the client controls. We say that the DOM elements have been upgraded to client controls. At runtime, the XML Script engine creates an instance of the Sys.Preview.UI.Label control and passes the span element as the associated element. Similarly, it creates an instance of the Sys.Preview.UI.Button control and passes the input element as the associated element. The value of the id attribute becomes the value of the id property exposed by the controls. This allows them to be referenced in XML Script code. The click attribute of the button tag E is mapped to the click event raised by the Button control. Its value is the name of the JavaScript function that handles the event. The function onGreetButtonClick uses the $find method to access the Label control and set the text of the associated span element through the set_text method. Table 11.1 lists the element wrappers defined in the Sys.Preview.UI namespace. Note that you obtain the name of the associated tag which is case insensitive by removing the namespace prefix from the class name.
Table 11.1 Element wrappers defined in the Sys.Preview.UI namespace Class name Description Wraps an input element of type button Wraps a span element Wraps an input element of type checkbox Wraps an anchor element Tag name
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