asp.net pdf 417 ASP.NET AJAX client components in .NET

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ASP.NET AJAX client components
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The Microsoft Ajax Library leverages a model for creating client components that closely resembles the one used to create server components with the .NET framework. In this chapter, we introduced the Sys.Component class and discussed the features provided by the client component model. Then, we talked about visual and nonvisual components so called depending on whether they have a UI and explained how instances of client components are created and accessed at runtime. Visual components can be behaviors or controls, and they re always associated with a DOM element. Behaviors are components that add client capabilities to a DOM element without changing its basic functionality. Controls are used to represent DOM elements on the client side; they can also provide specific client functionality to a block of structured markup code. Now that you possess the skills required to create client components, you re ready to learn how to wire them to ASP.NET server controls in order to create powerful Ajax-enabled controls.
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Building Ajax-enabled controls
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In this chapter:
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Script descriptors Introduction to Ajax-enabled controls Extenders Script controls
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The power of technologies like ASP.NET lies in the ability to work with server controls and, particularly, web controls. A web control is an object that abstracts and manages a particular portion of the web page, be it a single element (like a text box) or a table (like a grid). A web control covers the tasks from the rendering of the HTML to postback handling and communication with other server controls. All of the web control s logic is programmed, encapsulated, and executed on the server side as soon as you declare the web control on the page. Having learned how to use the Microsoft Ajax Library to build client components, you ll find out in this chapter how to wire them programmatically to ASP.NET server controls to obtain Ajax-enabled controls. By the end of the chapter, you ll learn how to build ASP.NET server controls with Ajax capabilities.
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Script descriptors
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In chapter 8, you saw how to create instances of client components in the page. Because the instantiation of a client component is a process that involves numerous steps besides creating a new instance, the $create method is a valid ally for successfully accomplishing this task. All the listings in the previous chapter assumed that the $create statements were manually injected in a JavaScript code block in the page and executed during the init stage of the client page lifecycle. Given the possibilities that the ASP.NET server model offers, here s an idea: If you can use $create to automate the process of instantiating a client component, why not also automate the process of injecting a $create statement into the page If a server control can perform this job, it can instantiate the client components it needs. Then, you can proudly say that you ve created an Ajax-enabled server control. The first step toward this goal is mastering the concept of script descriptors. A script descriptor is an object that can be used on the server side to generate a $create statement programmatically. To understand how script descriptors work and the reasons behind their usage, let s introduce some classes provided by the ASP.NET AJAX server framework.
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Script descriptor hierarchy
Script descriptors are classes contained in the System.Web.Extensions assembly. They re part of the System.Web.UI namespace and derive from a base abstract class called ScriptDescriptor. Figure 9.1 shows that the hierarchy of script descriptors reflects how classes are organized in the client component model. For example, the ScriptComponentDescriptor class represents the script descriptor
Script descriptors
associated with the client Sys.Component class. The same kind of mapping exists between the other classes, as the figure suggests. Script descriptors behave in an interesting manner. For example, if you create an instance of the ScriptComponentDescriptor class, you can generate the $create statement needed for creating and configuring an instance of a nonvisual component. In a similar manner, you can use instances of the ScriptBehaviorDescriptor and ScriptControlDescriptor classes to generate on the server side the $create statements needed for instantiating and configuring a client behavior or a control, on the client side. Programmatically generating a $create statement offers two main advantages. First, you don t need to hard-code any strings in the application logic. Instead, you can instruct the script descriptor to generate the $create statement based, for example, on the values of some server-side variables. Second, an external object can receive the script descriptor and use it to generate the $create statement at the right time. As we ll explain in section 9.2.1, the ScriptManager control can query a server control for a list of script descriptors. All the script descriptors are collected during the Render phase of the server page lifecycle and used to render all the $create statements in the markup code sent to the browser. Before we go deeper into this process, you need more confidence with script descriptors, because you ll use them often when programming Ajax-enabled controls. In the following sections, we ll focus on the ScriptBehaviorDescriptor
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