.net pdf 417 Controls in .NET framework

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Behaviors let you encapsulate a portion of client logic and plug it into a DOM element. Multiple behaviors can be associated with a single element, so a DOM element can acquire, at the same time, the client functionality provided by your behavior and, say, a third-party behavior. The client functionality of the element is the sum of the client capabilities provided by each behavior. In the next section, we ll experiment with controls, the other category of visual components. We ll follow an approach similar to that used for behaviors. You ll start by creating a simple control, and then we ll explain how to create instances of controls and how to access them in the application code. Finally, you ll see how to create custom controls. This will give you full control over ASP.NET AJAX client components.
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Just like behaviors, controls are visual components associated with DOM elements. Conceptually, a control differs from a behavior in the sense that instead of just providing client functionality, a control usually represents or wraps the element, to provide additional properties and methods that extend its programming interface. In ASP.NET, for example, a text box element is represented on the server side by the TextBox control. You can program against a TextBox object to specify how the element s markup is rendered in the page. In the same manner, you can have a TextBox control on the client side and program against it using JavaScript. In the following sections, we ll explore client controls and focus on a couple of scenarios where they re useful. We ll show you how to create an element wrapper and how to use a control to program against a block of structured markup code, instead of a single DOM element. In chapter 11, we ll explain how you can use a control to program against a DOM element using the XML Script declarative language.
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Sys.UI.Control
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A control is a client class that derives from the base Sys.UI.Control class. In turn, Sys.UI.Control is a child class of Sys.Component. Controls have an associated DOM element that is passed to the constructor during instantiation and returned by the get_element method. In the same manner as with behaviors, let s start by looking at the simplest control an empty control. The code for the EmptyControl class is shown in listing 8.8.
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ASP.NET AJAX client components
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Listing 8.8
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The simplest control is an empty control.
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Type.registerNamespace('Samples'); Samples.EmptyControl = function(element) { Samples.EmptyControl.initializeBase(this, [element]); } Samples.EmptyControl.prototype = { initialize : function() { Samples.EmptyControl.callBaseMethod(this, 'initialize'); }, dispose : function() { Samples.EmptyControl.callBaseMethod(this, 'dispose'); } } Samples.EmptyControl.registerClass('Samples.EmptyControl', Sys.UI.Control);
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An empty control is identical to an empty behavior, except that you derive from the Sys.UI.Control class. As usual, both the initialize and dispose methods are typically overridden to perform the initialization and cleanup of an instance. The rules for creating and accessing controls, outlined in the next section, are simple, and the differences from behaviors are minimal. Let s examine them before you begin coding custom controls.
Creating controls
Being client components, controls are created with a $create statement during the init stage of the client page lifecycle. A control must always be associated with a DOM element; otherwise, an error will be thrown at runtime by the Microsoft Ajax Library. The following code shows how to create an instance of the EmptyControl control, which you coded in listing 8.8, using the $create method:
$create(Samples.EmptyControl, {}, {}, {}, $get('elementID'));
As usual, the last argument passed to $create is the associated DOM element, retrieved with a call to the $get method. The argument passed to $get is the ID of the DOM element. A control is instantiated in the same manner as a nonvisual component, as we explained in section 8.2.1. Now, let s peek at how controls are accessed in web pages.
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