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Figure 725 The output of the loadHandler method
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Figure 726 The output of the loadHandler method
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As Figure 726 shows, we are in a partial load and only the Inside UpdatePanelHC and its respective DragPanelExtender were created during processing of the partial postback response
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SUMMARY
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In this chapter, we covered how the partial postback environment affects our control development Knowing how and when components are automatically disposed of and re-created due to a partial postback allows us to alter this pattern as needed to our advantage when we are working outside the default development situations We also covered the new script registration methods available from the ScriptManager and how they work during a partial postback These enable us to register JavaScript that works during all rendering environments
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7: Control Development in a Partial Postback Environment
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Finally, we covered how SysApplication s load and init events react to a partial postback and how we can use them to successfully attach code during a partial postback
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PART III
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Communication
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ASPNET AJAX Communication Architecture
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of ASPNET AJAX is a must know for any developer The way the client communicates with the server can in uence many of your design decisions during development and can be the difference between having an ef cient and easily con gurable communication channel or one that is slow and hard to work with The communication layer that ASPNET AJAX provides enables you to easily communicate between the client and the server and includes features such as automatic proxy generation for web services and page methods; built-in proxies for working with the ASPNET 20 application services such as the authentication service, pro le service, and role service; and the ability to work with JavaScript Object Notation (JSON)-based data In this chapter, we cover the server-based ASPNET 20 AJAX Extensions communication architecture and the client-based Microsoft AJAX Library communication architecture We begin our discussions with the ASPNET 20 AJAX Extensions, describing the new Window Communication Foundation (WCF) web services features, page methods, JSON serialization, and the server framework components that provide the underlying functionality for communication on the server Then, we move on to the Microsoft AJAX Library and discuss service proxies, JSON serialization, and the web request core components
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H E C O M M U N I C AT I O N A R C H I T E C T U R E
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8: A SPNET AJA X Communication Archite cture
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New Communication Paradigm
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The method of communication in ASPNET AJAX is a paradigm shift from the standard postback model of ASPNET 20 That model consisted of server-side event handlers processing requests that originated on the client In ASPNET AJAX, the focus is on ne-grain communication that can accomplish a speci c task using a lightweight call to the server that does not require a postback This model of the client calling back to the server is similar in a lot of ways to how client/server programming works, where the client makes a call to the server for data and then processes the data locally This emphasis on client-side functionality is why we spent the rst part of this book covering JavaScript and the Microsoft AJAX Library, so we would have a solid foundation of client-side programming The rst instinct most people have when hearing of this new approach to development is to completely rewrite their application to be client-centric This is not what we are proposing In our experience, you will see a combination of these two models during development, with ASPNET 20 AJAX Extensions and the Microsoft AJAX Library providing the foundation for smaller request types such as dynamic data population and data validation, and ASPNET 20 providing the foundation for working with postbacks and page transitions As we think about these lightweight calls that ASPNET AJAX relies on, we can t help but discuss the REST architectural pattern that is the guiding principal for this type of communication
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The Meaning of Postback
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The term postback in our case means calling back to the page and running through a complete page lifecycle This page lifecycle incurs a huge cost on small page requests because ASPNET loads up view state, the control tree, and res event handlers that cause the page to call back to the server Calling a web service using ASPNET AJAX does not do this and is therefore a much more ef cient way to call back to the server without incurring a complete page lifecycle
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Representational State Transfer (REST) is an architectural pattern used in the World Wide Web and can be loosely described as a pattern that relies on resources to expose an addressable interface, enabling you to transmit data over HTTP without the need of an additional layer The term REST