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Embedding resources in an assembly is a common technique for controls and libraries that require resources like images and scripts. This approach simplifies how controls are packaged and deployed.
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Now that you understand how the scripts are downloaded, let s see how you can leverage the ScriptManager control to deploy additional scripts.
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Deploying JavaScript files
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Earlier, we examined how the ScriptManager control downloads resources to the browser by using a new HTTP handler: ScriptResource.axd. You also got a glimpse of this in chapter 2 when we discussed the Microsoft Ajax Library and how the core JavaScript files in the framework are delivered and manipulated with the ScriptManager. The next logical step is for you to learn how other scripts can be deployed. The ScriptManager control has a property called Scripts that contains a collection of ScriptReference objects. A ScriptReference is nothing more than a way of registering a JavaScript file for use on a page. Listing 4.2 demonstrates how to include a few scripts on the page using the ScriptReference collection.
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Listing 4.2 A ScriptReference, which registers files for deployment to a web page
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<asp:ScriptManager ID="ScriptManager1" runat="server"> <Scripts> <asp:ScriptReference Path="~/scripts/Script1.js" /> <asp:ScriptReference Path="~/scripts/Script2.js" />
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ScriptManager: the brains of an Ajax page
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<asp:ScriptReference Assembly="Demo" Name="Demo.SuperScript.js" /> </Scripts> </asp:ScriptManager> Cueballs in code and text
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In the first two entries, local JavaScript files are registered as references for the page. In the third entry, an embedded JavaScript file from an assembly is deployed to the site. Each reference added to the collection results in another ScriptResource.axd entry in the response s payload to the browser. Now that you have a general grasp of how scripts are deployed, let s examine another functionality of the ScriptManager: registering service references.
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Registering services
Working with JavaScript files is an important component of Ajax programming. However, accessing the server for data from JavaScript is what makes Ajax truly possible. In order to be granted this support with the ASP.NET AJAX framework, you must register a service reference for each local web service you wish to interact with. The ScriptManager has a property called Services that contains a collection of ServiceReference objects. A ServiceReference object is a mechanism for registering services you can access from JavaScript. The end result is a JavaScript proxy that serves as the gateway to the service from the browser. Listing 4.3 demonstrates how to register local services with the ScriptManager.
Listing 4.3 A ServiceReference, which provides a gateway to the service from JavaScript
<asp:ScriptManager ID="ScriptManager1" runat="server"> <Services> <asp:ServiceReference Path="~/Services/MainService.asmx" /> <asp:ServiceReference Path="~/Services/TestService.asmx" /> </Services> </asp:ScriptManager>
5 will take you deeper into how to communicate with services. For now, you can see that the pattern for adding script references is also applied to service references. Another important feature of the ScriptManager is the ability to support localization for languages and cultures. Let s quickly examine how this works before moving back to the existing ASP.NET application.
Exploring the Ajax server extensions
Localization
The process of supporting specific languages and cultures in an application is commonly referred to as localization. You can also consider localization the act of translating the interface. In ASP.NET, this is typically done by embedding localized resources into an organized structure of assemblies, also known as satellite assemblies. The ASP.NET AJAX framework supports both this model and a more clientcentric model of using static JavaScript files on the server. Let s explore both of these occurrences to gain a general grasp of localization. Localized script files Localized JavaScript files are nothing more than files mapped to a specific culture. You create this mapping by including the name of the UI culture in the filename. For instance, a script file that is targeted for the Italian language could be named SomeScript.it-IT.js. The it-IT stands for the well-known culture identifier of the Italian language in Italy. Proceeding with this pattern, a French version of the file could appropriately be named SomeScript.fr-FR.js, and our comrades in the Ukraine could name their file SomeScript.uk-UA.js (you get the point). Rather than implementing logic that gets the current culture on the user s machine and loads the correct file accordingly, you can (and should) use the ScriptManager control to do the work for you. The first step in configuring this is to enable script localization:
<asp:ScriptManager ID="ScriptManager1" runat="server" EnableScriptLocalization="true"> </asp:ScriptManager>
Setting the EnableScriptLocalization property of the ScriptManager to true forces the control to retrieve script files for the current culture, if they re available. By default, this property is set to false, which means it doesn t perform any localization lookup for you. Consequently, if you now include a script reference for SomeScript.js, intentionally omitting the culture name, the appropriate file is downloaded:
<asp:ScriptManager ID="ScriptManager1" runat="server" EnableScriptLocalization="true"> <Scripts> <asp:ScriptReference Path="SomeScript.js" /> </Scripts> </asp:ScriptManager>
To reiterate, if the UI culture on your machine were set to Italian, then SomeScript.it-IT.js would be downloaded. Under the hood, the ScriptManager uses the
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