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window.unload = function() { var buffer = ops.serialize( delegates); }` In this solution, the unload function will be called, and a stream of data that represents the delegates will be generated. But is this solution actually correct I argue that the solution is delegating the problem of the delegates variable to another location, and it is not solving anything. Imagine, for instance, that you are serializing the state of a page. As you iterate the elements, you are generating the associated functions. So you will serialize window.load and window.unload. The state of delegates is still missing. And this is the crux of the problem, as the serialization of delegates is a separate stream from the serialization of the HTML page. With the architecture shown in Figure 2-8, there is only one stream as the HTML page, and its associated functions and objects are the state. This simplifies an HTML page, because the programmer does not need to create separate serialization routines to manage the individual objects created on the HTML page. The big advantage of this approach is that when coding using a prototype-based language which JavaScript is you are not worried about multiple implementations sharing the same references. Using a value-based approach, you can copy a function from one object to another and not worry about the mixin problem described in Recipe 2-15. Now that you re familiar with the theory behind delegate implementation, let s look at the technical details. Source: /website/ROOT/scripts/jaxson/common.js delegate : function(instance, funcIdentifier, newFunc) { var delegatePrototype = function() { var func1 = __replace1; var func2 = __replace2; func1.apply(this, arguments); func2.apply(this, arguments); } var origFunc; if (!instance[funcIdentifier]) { origFunc = function() { }; } else { origFunc = instance[funcIdentifier]; } instance[funcIdentifier] = Generics.expand(delegatePrototype, { __replace1 : origFunc, __replace2 : newFunc }); },

For the scope of this book and this pattern, it does not make sense to use the HTTP Expiration model because Ajax applications are inherently using data that does change Implementing HTTP validation is simple because the most popular web browsers and HTTP servers already implement it In this chapter, I will discuss the details of implementing HTTP validation because there are some things the web browser and HTTP server do not do However, building a more sophisticated infrastructure that supposedly enhances HTTP validation is not recommended because that would be defeating the facilities of HTTP 11 Using the HTTP 11 infrastructure means that the server you are communicating with must have implemented the HTTP 11 protocol properly If you are using Microsoft Internet Information Server, Apache Tomcat, or Jetty, you will have no problems.

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Images of plus and minus signs appear when a node is collapsed or expanded, and images of dotted lines are used to express the relationship between parent and child nodes Images such as these are standard in a typical explorer view, of course, but they are a little more difficult to achieve in a server control To support this look and feel, the TreeView control utilizes image files that are stored on the web server In ASP NET applications this is a simple matter of copying files, but making the images available to web parts is a little more difficult Follow these steps to make the tree images available: 1 Open the Windows File Explorer and create a new directory structure with the path \inetpub\wwwroot\webctrl_client\1_0 2 Copy the contents of the directory \Program Files\IE Web Controls\build\Runtime to the directory \inetpub\wwwroot\webctrl_client\1_0 3 Open the SharePoint Central Administration site 4.

As in the function proxy defined in Recipe 2-16, JavaScript generics are used The delegatePrototype function variable looks very similar to the function declaration of Figure 2-8, because they are the same Thus, there is no need to explain delegatePrototype, with the exception of the __replace1 and __replace2 identifiers __replace1 and __replace2 are the placeholder function identifiers that will be expanded using JavaScript generics The method delegate can be used as follows Source: /website/ROOT/ajaxrecipes/javascript/exceptionshtml windowonload = function() { windowonerror = function(msg, file, location) { info("windowonerror1", "Msg (" + msg + ") file (" + file + ") location (" + location + ")"); } } opsdelegate(window, "onload", function() { windowonerror = function(msg, file, location) { info("windowonerror2", "Msg (" + msg + ") file (" + file + ") location (" + location + ")"); }}); In the example, the window.

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