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As I see it, for the sake of compatibility you will end up with a subset of XML limited to nodes and attributes. At that point, it s merely a matter of choosing between the angle brackets of XML and the curly brackets of JSON. Additionally, JSON has a free parser already built into the JavaScript engine the aforementioned function eval. Also labeled as the fat-free alternative to XML, JSON has ultimately been a very convenient choice for architects of Web frameworks and is today the real currency exchanged by browsers and Ajax-enabled services.
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You can consume a REST service by simply invoking its URL and processing its response. We ll get into this example in the next chapter via the jQuery library. A referenced Ajax-enabled WCF or Web service, however, can automatically generate a JavaScript proxy class, which might make invoking the service easier.
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Getting a Proxy for the HTTP Fa ade
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When you add a Web or WCF service to a classic Web application project or to a Windows Forms project, you go through a Visual Studio wizard, indicate the URL of the service, specify the desired namespace, and finally have the wizard generate a proxy class and add it in the folds of the project solution. When you add a reference to Web or WCF services to an ASP.NET AJAX page, no Visual Studio wizard will be there to silently invoke an SDK tool that automagically creates the proxy class. In the first place, you don t add a service reference through the Web project. Instead, you programmatically add the service reference to the ASP.NET page, as shown here:
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<asp:ScriptManager ID="ScriptManager1" runat="server"> <Services> <asp:ServiceReference Path="appAjaxLayer.svc" /> ... </Services> </asp:ScriptManager>
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The script manager emits the following markup:
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<script src="appAjaxLayer.svc/js" type="text/javascript"></script>
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If you re testing your page and have debug mode set in the web.config file, the suffix to the service URL will be /jsdebug instead of /js. The /js suffix is the magic word that instructs the service infrastructure to generate a JavaScript proxy class for the client code to call the service. In particular, for WCF services the enableWebScript attribute of the endpoint behavior enables the generation of the proxy; subsequently, it enables the service to be scripted from an Ajax client.
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Part V
The Client Side
The JavaScript proxy class is named according to different rules for Web and WCF services. For Web services, the proxy gets the exact fully qualified name of the class behind the .asmx endpoint. For WCF services, the name of the proxy class is determined by the concatenation of the Namespace and Name properties specified in the ServiceContract attribute you re targeting. Note, therefore, that when you call a WCF service method you re actually calling a method defined on a contract. To invoke a WCF service, it s the contract that matters, not the class that implements it. In fact, the same service class can implement multiple contracts.
Using the Proxy
After you have the JavaScript proxy, invoking the Web or WCF service is nearly the same thing. The proxy object comes as a singleton and exposes the same set of contracted methods you have on the original service. The communication model is asynchronous and requires you to specify at least a callback function to use in case of successful execution. Here s an example:
// Async call of method GetQuotes with a callback Samples.Services.FinanceInfoService.GetQuotes(symbols, onDataAvailable);
The code can refer to a Web service as well as a WCF service. If it refers to a Web service, the Web service class is named Samples.Services.FinanceInfoService; if it refers to a WCF service, the namespace of the service contract might be Samples.Services and the name of the contract might be FinanceInfoService. The preceding code snippet invokes the method GetQuotes. In addition to the regular list of parameters for the service method, each proxy method can take up to three extra parameters. The first extra parameter is mandatory and represents the callback to invoke if the method execution is successful. The second and third optional parameters indicate, respectively, the callback to use in case of failure and a state object to pass to both callbacks. In the code snippet just shown, the onDataAvailable parameter refers to a JavaScript callback to call only if the method executes successfully. The signature of the success and failure callbacks is similar, but the internal format of the results parameter can change quite a bit. Here s the callback signature:
function method(results, context, methodName)
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