c# thoughtworks qrcode Lesson 2: Creating Client Scripts with the Microsoft AJAX Library in Visual C#.NET

Paint QR Code JIS X 0510 in Visual C#.NET Lesson 2: Creating Client Scripts with the Microsoft AJAX Library

Lesson 2: Creating Client Scripts with the Microsoft AJAX Library
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ChAPTER 9
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You can follow this similar model to trap other events in the library. For example, another important class with events that you might want to work with is the PageRequestManager class of the Sys.WebForms namespace. This class is used for partial-page updates and asynchronous postbacks. It includes the following events:
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initializeRequest beginRequest pageLoading
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Raised before the asynchronous postback starts
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Raised as the asynchronous postback is sent to the server Raised when the asynchronous postback response first comes back
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pageLoaded endRequest
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Raised after the content has been loaded from the results of the asynchronous postback Raised when the asynchronous postback has been completed
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As you might have guessed, the UpdatePanel control relies heavily on these events. You can also use these events to cancel asynchronous postbacks, provide custom information or animation to the user when these events are fired, or simply run your code at specific times within the request.
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Building Client Capabilities with AJAX
Thus far, you ve seen how to program against the Microsoft AJAX Library. You can use the skills you ve learned to create client-side controls that are built on the Microsoft AJAX Library and thus are managed by it. It is important to remember that these are not server controls. Rather, they are controls that implement AJAX features on the client. There are three types of client objects you can create with the Microsoft AJAX Library: component, control, and behavior objects. The following provides a brief description of each:
sys.Component This object provides a base class for creating reusable AJAX components. Classes that derive from Sys.Component do not generate UI elements. Instead, they work as common controls that provide functionality across pages. For example, the Timer control in the Microsoft AJAX Library implements Sys.Component. sys.Ui.Control This object provides a base class for creating reusable, AJAX-enabled client controls. These controls are typically related to a single Document Object Model (DOM) element (such as an input box or button). They provide additional functionality to the DOM element with which they are meant to work. sys.Ui.behavior This object represents a base class for creating behaviors that can be added to one or more DOM elements at design time. A behavior is not associated with a single DOM element. Rather, it can extend the DOM elements to which it is applied. For example, you might create a behavior that opens a new window when the cursor points to the element. You could then apply this behavior to a button, input box, hyperlink, or other element.
Every control you create to work with the Microsoft AJAX Library will derive from one of these objects as its base. The sections that follow provide additional details on the three types of client objects you can create with the Microsoft AJAX Library.
494 ChAPTER 9 Working with Client-Side Scripting, AJAX, and jQuery
Creating an AJAX Client Component
An AJAX client component is a class you create that derives from the Sys.Component class. You derive from this class when you want to create a class that gets managed by the Microsoft AJAX Library but does not work directly with the UI. This is similar to the class that was created in the previous section. However, in this case, you inherit the Sys.Component base class. This ensures that the library knows how to manage the lifetime of your object from initialize through disposal. As an example (and building on the password example), consider a class that you write as a component that provides methods for verifying the strength of a password on the client. You would create this class the same way classes were created in the previous section. However, for the client component you have a couple of additional items to consider. First, when you define the class constructor, you should make sure to initialize the base constructor in the base class. The following code shows an example.
Type.registerNamespace("AjaxEnabled"); //create constructor AjaxEnabled.PasswordStrengthComponent = function() { AjaxEnabled.PasswordStrengthComponent.initializeBase(this); }
Next, you might consider overriding the base class s methods. When you do, you should also make sure to call the methods of the base class you are overriding. You can do so by calling the callBaseMethod method (of the Type class). As an example, if you override the initialize method of the base class, you should write the following code to call its base init method.
initialize: function() { AjaxEnabled.PasswordStrengthComponent.callBaseMethod(this, 'initialize'); //add custom initialization here }
Finally, when you register the actual component, you must indicate that you are inheriting from the Sys.Component base class. The following shows an example of the registerClass method indicating inheritance of the Component class.
//register class as a Sys.Component AjaxEnabled.PasswordStrengthComponent.registerClass( 'AjaxEnabled.PasswordStrengthComponent', Sys.Component);
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