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The Good and the Bad
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Placing direct calls to some remote endpoint gives you the greatest flexibility as you receive raw data completely devoid of any layout information. This is the gist of AJAX, after all. On the down side of it, though, you find the JavaScript language and the DOM environment.
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You can program your presentation logic only by using lines and lines of JavaScript code; you can make updates only by setting properties on the browser s DOM. Most of the time, you can reach a good compromise between complexity and the quantity of code to write and performance. However, that has to be verified each and every time. For now, a better and richer JavaScript is possible only through libraries that cover parts of client-side programming that the language doesn t natively cover. Classes, networking, static type checking, and a common and cross-browser model for managing events and exploring the document are all features required in modern JavaScript code. Popular libraries, such as the Microsoft AJAX library, provide just this. The key trait of the Microsoft AJAX library is the set of extensions to transform JavaScript into an object-oriented language. JavaScript is not a true object-oriented programming (OOP) language even though it always has supported objects and also provides a rudimentary mechanism for prototyping classes and derived classes. The Microsoft AJAX library builds on top of this basic functionality to add namespace and interface support in addition to a number of helpful facilities. In addition to extending the core of the language, for effective scripting you need rich libraries that provide higher-level tools for UI tasks. The jQuery library is the de facto standard, and the jQuery UI library has become one of the coolest plugins around. Direct scripting takes you toward JavaScript-intensive applications and a new set of programming tools, such as the one coming out of the ASP.NET AJAX 4 development. If you re familiar with and feel comfortable with JavaScript today, you can even consider JavaScript-only sections for a Web application.
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AJAX in ASP.NET MVC
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Discussing the AJAX capabilities of a given ASP.NET framework entails discussing the way in which that particular framework hides its own calls to the underlying XMLHttpRequest object. In the context of ASP.NET MVC, you typically use three types of wrappers for low-level XMLHttpRequest calls: the jQuery API for AJAX, the JavaScript proxy classes for Web services, and some native HTML helpers that use a specific, AJAX-oriented JavaScript library that comes with ASP.NET MVC.
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The JavaScript API
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ASP.NET MVC owes a large share of its popularity to the full control it yields to developers when it comes to generating HTML. Full control over HTML also means full control over the script code being included in the page. The default project template you get in Visual Studio 2010 for ASP.NET MVC stores in the Scripts folder a bunch of JavaScript files, including the latest jQuery library, as shown in Figure 9-3.
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9 AJAX Capabilities
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FIGuRE 9-3 Default script files inserted in the standard ASP.NET MVC project template
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This means that the AJAX API available in jQuery is an effective starting point for implementing AJAX functionalities in ASP.NET MVC. As you can also see in Figure 9-3, the Microsoft AJAX library, and its native support for Web service proxy classes, is another good option. Let s start with jQuery, then.
Using jQuery to Perform AJAX Calls
In jQuery, you can have a few shorthand methods to quickly arrange asynchronous calls to a remote endpoint. All methods, however, leverage the services of a single function the ajax function. You use the ajax function, as shown next:
$.ajax( { type: "POST", url: "getOrder.aspx", data: "id=1234&year=2007", success: function(response) { alert( response ); } } );
The ajax function gets a list of parameters, such as type, url, data, dataType, cache, async, and success. The dataType parameter indicates the type of the expected response, whereas success indicates the completion callback. The callback function receives the URL response as its sole argument. In addition to ajax, a number of helper methods exist to simplify common operations such as downloading a script. Table 9-1 lists such helpers.
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