By Shahram Khosravi
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This chapter then dives into the process through which the current client-side PageRequestManager instance makes an asynchronous page postback request to the server, and you also learn about this instance’s initializeRequest and beginRequest events. NET AJAX applications. ❑ Chapter 23, “Asynchronous Partial Page Rendering: Server-Side Processing,” follows the Page object through its life cycle phases to process an asynchronous page postback request where you’ll learn about the role of the server-side PageRequestManager, RetrievePostData, ScriptManager, UpdatePanel, ScriptRegisterationManager, and triggers in generating the final response text.
Internet Ajax Engine JSON/XML Serializer Scheduler (XMLHttpRequest) Renderer (DHTML) Figure 1-2 As this figure shows, the AJAX engine consists of the following three main components: ❑ Scheduler: The scheduler uses AJAX technologies such as XMLHttpRequest to send data to and receive data from the server in an asynchronous fashion. As the name suggests, the scheduler schedules and makes the client requests to the server. ❑ Renderer: The renderer component of the AJAX engine uses DHTML to dynamically update only those portions of the current page that need refreshing without re-rendering or re-loading the entire page.
This chapter also implements a page that enables you to inspect the server response text. ❑ Chapter 24, “Asynchronous Partial Page Rendering: Client-Side Processing,” follows the client-side PageRequestManager instance through its life cycle phases to process the server response to an asynchronous page postback request where you’ll see for yourself how the current client-side PageRequestManager manages to parse the server response text, download the required scripts, and update the required UpdatePanel server controls on the client side.