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Note that you always need to use this to refer to members of the prototype from within any related member function. In the prototype model, members are shared by all instances as they are invoked on the shared prototype object. In this way, the amount of memory used by each instance is reduced, which also provides for faster object instantiation. Aside from syntax peculiarities, the prototype model makes defining classes much more similar to the classic OOP model than the closure model. The choice between closure and prototype should also be guided by performance considerations and browser capabilities. Prototypes have a good load time in all browsers; indeed, they have excellent performance in Firefox. (In contrast, closures have a better load time than prototypes in Internet Explorer.) Prototypes provide better support for IntelliSense, and they allow for tool-based statement completion when used in tools that support this feature, such as Microsoft Visual Studio. Prototypes can also help you obtain type information by simply using reflection. You won t have to create an instance of the type to query for type information, which is unavoidable if closures are used. Finally, prototypes allow you to easily view private class members when debugging. Debugging objects derived using the closure model requires a number of additional steps. Note Whether you opt for closure or prototype, writing complex JavaScript code requires a lot of discipline. An interesting pattern to explore is the Module Pattern, which essentially introduces the concepts of namespaces and dependencies in JavaScript code where no such elements exist natively. A good introduction to the pattern can be found here: http://www.adequatelygood.com/2010/3/JavaScript-Module-Pattern-In-Depth.

For security reasons, all XMLHttpRequest calls within all browsers are restricted to the Same Origin Policy (SOP). In other words, all browsers proceed with an XMLHttpRequest call only if the destination URL is within the same origin as the calling page. Because XMLHttpRequest uploads cookies, a user authenticated on a site (say, contoso.com) might end up on another site (say, thebadguy.com) and leave there her authentication cookie. At this point, from the thebadguy.com site an attacker could make an XMLHttpRequest request to contoso.com and behave as if it were the original user. In a nutshell, script-led cross-domain calls are forbidden. The problem is that sometimes cross-domain calls are useful and entirely legitimate. How to work around the limitation Generally speaking, there are four possible approaches:

EndsWith (postfix)

Using a server-side proxy Using Silverlight or Flash applets and their native workarounds to bypass SOP Leveraging cross-domain-enabled HTML tags such as <script> and <iframe> Using ad hoc browser extensions specifically created to enable cross-domain XMLHttpRequest calls

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These are the various options you might want to consider first as a software architect. These are the options that would work without requiring each user to tweak security settings on her browser. Note, however, that most browsers let you disable the SOP policy through the dialog box for the security settings. If you, as a user, proceed with and enable cross-domain calls, all XMLHttpRequest calls magically work, regardless of their final destination. From a design perspective, however, this solution has a strong prerequisite: it requires you to exercise strict control over all possible machines that will be using the site. For Internet Explorer, you select the Security tab from the Internet Options dialog box and then scroll down to the Miscellaneous section, as shown in Figure 20-2. Be aware that a similar option might not exist for other browsers. I ll return to cross-domain calls in the next chapter with a few concrete examples. For now, suffice it to say that two approaches are the most commonly used today: server-side proxies and JSON with Padding (JSONP) over the <script> tag.

LastIndexOf (search[, start[, end]])

A good strategy for robust and effective ASP.NET error handling is based on the following three guidelines:

IndexOfAny (chars[, start[, end]])

The Document window now looks like this:

Anticipate problems by wrapping all blocks of code that might fail in try/catch/finally blocks. This alone doesn t guarantee that no exceptions will ever show up, but at least you ll correctly handle the most common ones. Don t leave any exceptions unhandled. By following this guideline, even if you did not anticipate a problem, at least users won t see an exception page. You can do this both at the page and application levels. Needless to say, an application-level error handler takes precedence over page-level handlers. At the least, exceptions that are handled at the application level should be logged to feed reports and help the team to understand what went wrong and whether some bugs exist that need to be fixed. Make sure that error pages don t give away any sensitive information. If necessary, distinguish between local and remote users and show detailed messages only to the former. A local user is defined as the user that accesses the application from the Web server machine.

Outlined in this way, error handling is mostly a matter of writing the right code in the right place. However, ASP.NET provides developers with a built-in mechanism to automatically redirect users to error-specific pages. This mechanism is entirely declarative and can be controlled through the web.config file.

LastIndexOfAny (chars[, start[, end]])