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and also the matchAnywhere boolean value. Both of these were used in listing 10.1 to develop the results. Then we start to load the document by calling the ContentLoader. We are sending the URL of the server-side page and the JavaScript function to call when the results are returned as the first two parameters in the ContentLoader. The third parameter is null since we want to ignore any error messages. Ignoring the errors allows the type-ahead to act like a normal text field. The last two properties inform the ContentLoader to post the data to the server and send the form parameters contained in the string strParams. When the results are returned from the server, the function BuildChoices() is called to allow us to finish the processing of the data on the client. When we developed the server-side code, we returned the results as a two-dimensional JavaScript array. This array contained the option s text-value pairs for the choices. However, in the response, it is just a string of characters. We need to take this returned string and make it accessible as a JavaScript array. Listing 10.12 contains the functionality that executes the information returned from our ContentLoader using the eval() method.

You could build a lot more logic into this process, but this shows you the basics of assigning a random software update server using a shell script, highlighting the defaults command in; for example, a non-MCX-managed environment. (We ll more on MCX and software-update scripts in 7.)

In an ideal world, we would like to allow access to the dynamic data served from our app to the Ajax client (and possibly other authorized parties) and prevent anybody else from getting in. With some rich-client technologies, we would have the opportunity of using custom network protocols, but the Ajax application is limited to communicating over HTTP. Secure HTTP can keep the data in individual transactions away from prying eyes, as we discussed earlier, but it can t be used to determine who gets to call a particular URL.

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Fortunately, HTTP is quite a rich protocol, and the XMLHttpRequest object gives us a good level of fine-grained control over it. When a request arrives on the server, we have access to a range of HTTP headers from which we can infer things about the origin of the request. Filtering HTTP requests For the sake of providing concrete examples, we ll use Java code here. Other server-side technologies offer similar ways to implement the techniques that we are describing, too. In the Java web application specification, we can define objects of type javax.servlet.Filter, which intercept specific requests before they are processed at their destination. Subclasses of Filter override the doFilter() method and may inspect the HTTP request before deciding whether to let it through or forward it on to a different destination. Listing 7.5 shows the code for a simple security filter that will inspect a request and then either let it through or forward it to an error page.

Mac OS X comes with a variety of commands for managing settings without having to edit a configuration file or, in some cases, making it so you actually don t want to edit a property-list file. For example, you can get and set the computer name far more easily than with defaults by using scutil. This command returns the computer name:

We re going to do some detail editing of the Home Sync preferences, so doubleclick the Home Sync entry. The details editor should look like the one shown in Figure 12-16. NOTE: The gray circle with a white mouse pointer is an indication that there are some preferences already defined for that category. These were defined when we used the Preferences Overview Mobility editor.

public abstract class GenericSecurityFilter implements Filter { protected String rejectUrl=null; public void init(FilterConfig config) throws ServletException { rejectUrl=config.getInitParameter("rejectUrl"); Configure reject URL }

If you want to change the name, you use set. So to make the computer name kryptedmacbook, you use the command

public void doFilter( ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { if (isValidRequest(request)){ Check request validity chain.doFilter(request, response); }else if (rejectUrl!=null){ Forward to reject URL RequestDispatcher dispatcher =request.getRequestDispatcher(rejectUrl); dispatcher.forward(request, response); } }

Now, let s say you re writing a shell script and you want to put the computer name in a variable called computernm). At the command line, type:

protected abstract boolean isValidRequest(ServletRequest request); public void destroy(){} }

computernm=$(scutil get ComputerName)

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