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function onLoadRolesFailed(error, userContext, methodName){ alert(error.get_message()); }
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The first task is to call the B load function in the service. When it returns successfully, you check to see if the user is in the Admin role by calling the C isUserInRole function. An alternative would be to retrieve a comma-delimited list of roles from the roles property:
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Sys.Services.RoleService.get_roles();
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This requires you to then split and parse the list which for a different scenario might be more efficient than calling isUserInRole repeatedly. Because you re only comparing against a single role, the original approach makes more sense. Working with the ASP.NET application services is simple. Because they re nothing more than built-in Web Services, the same patterns we covered earlier callbacks, user context, timeout, and so on apply here as well.
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Message board application
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We ve created a sample message board application that combines all the topics discussed in this chapter, along with some content from chapter 9. The source code for the message board application is available on the book s website at http:// www.manning.com/gallo. We mention it here as a reminder that you can download the code from the site for additional examples. Figure 5.14 shows the application in action.
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Summary
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Figure 5.14 The message board application demonstrates a complex, real-world example of how to use some of the patterns discussed in this chapter.
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In this essential chapter, we covered the most primitive and influential pattern used in Ajax programming: making asynchronous calls from the browser to the server. The plumbing work needed to accomplish this task, along with the abstraction of cross-browser discrepancies, are handled for you by the ASP.NET AJAX framework. With the help of Web Service proxies generated by the framework, you can use local Web Services as a business layer to the applications that run on the browser. You can also use local Web Services to facilitate communication with other remote servers and services on the web. This chapter covered the most typical and recommended approach for building Ajax applications. Although this chapter was dedicated solely to client-centric programming with ASP.NET AJAX, the next few chapters return to the server-side element of the framework. To become a solid ASP.NET AJAX developer, you must be comfortable with both realms of the architecture. In the next chapter, we ll revisit the UpdatePanel control and take a thorough walk through its features.
Partial-page rendering with UpdatePanels
In this chapter:
Partial page updates Triggers and modes Nesting and repeating UpdatePanels Creating a live GridView filter
With great power comes great responsibility
One of the most fascinating controls in the ASP.NET AJAX framework is the UpdatePanel. This new control replaces the need for a page to refresh during a postback. Only portions of a page, designated by the UpdatePanel, are updated. This technique is known as partial-page rendering and can be highly effective in improving the user experience. At the end of chapter 1 and in segments of chapter 4, you got a glimpse into how the UpdatePanel works and how simple it is to apply to existing ASP.NET applications. In this chapter, the first of two dedicated solely to the UpdatePanel, we ll take you through a series of examples that demonstrate how to use the control effectively. In the process, you ll gain some insight into how it works together with the ScriptManager control to manage and orchestrate partial-page updates. By the end of this chapter, you ll have a solid understanding of how to apply the UpdatePanel correctly to enhance ASP.NET applications. Just like any other powerful tool, the UpdatePanel requires care and knowledge to fully exploit its influence on a page s performance and behavior. We begin this chapter with some thoughts on its power and responsibilities.
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