Simple .NET/ASP.NET PDF document editor web control SDK

Regardless of the environment in which you re developing, you re bound to make some mistakes. Some studies estimate that as much as 50 percent of a developer s time is spent figuring out other people s code and finding and fixing errors. The tools and techniques outlined in this chapter will help you track down and terminate bugs with a minimum amount of time and effort. The Greasemonkey extension for Firefox allows a user script to run that can help you debug the actual Ajax requests and responses that are sent from the browser to the server and back again. This tool can help determine whether a bug is occurring on the browser side or the server side. The Microsoft Script Debugger is a JavaScript debugger that integrates with Microsoft Internet Explorer and provides basic debugging facilities such as breakpoints and variable inspection and editing. Venkman is a JavaScript debugger that integrates with Mozilla-based browsers such as Firefox and that provides more advanced debugging features such as intelligent breakpoints and performance profiling. You no longer need to avoid Ajax or JavaScript development because no productivity tools are available. Using the tools and techniques described in this chapter, you can confidently begin expanding your Ajax and JavaScript development, knowing that if troubles arise, you have the tools available to find the problems and fix them.

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Once you ve recognized that a value is of a certain type, it s common to want to be able to do something with that value To be able to use the value on the right side of a rule, you can use the as keyword followed by an identifier You can see this in the next example, where you rewrite recognizeType to include the value in the message that is printed when a type is recognized:.

Figure 14-3. Loop menu Every time you run the program, you need to go into the NXT-G environment to retrieve the data file. First, click the NXT window button (see Figure 14-4).

ell, we ve covered quite a bit in this book! By now, you have a good idea of what Ajax can do for you, and you have a starter kit of examples to get you going. We ve introduced you to a number of tools that will make developing Ajax applications easier, and you have no excuse to skip testing! In this chapter, we ll cover some additional topics such as patterns and frameworks and show you a more involved Ajax example.

#light let anotherList = [ box "one"; box 2; box 30 ] let recognizeAndPrintType (item : obj) = match item with | : SystemInt32 as x -> printfn "An integer: %i" x | : SystemDouble as x -> printfn "A double: %f" x | : SystemString as x -> printfn "A string: %s" x | x -> printfn "An object: %A" x Listiter recognizeAndPrintType anotherList The results of this example, when compiled and executed, are as follows: A string: one An integer: 2 A double: 3000000 Notice how for a final default rule you just use an identifier You don t need to match it to a type since you already know it will be of type obj, since the value being matched over is already of type obj.

Figure 14-4. NXT window button Then select the Memory tab (see Figure 14-5).

In fact, if you try to create a rule where you match with type obj, you will get a compile error since this rule will always match You can see this in the next example, where the previous example is reworked to generate the compile error I m talking about: #light let thirdList = [ ("one" :> obj); (2 :> obj); (30 :> obj) ] let reconizeTypeWrongly (item : obj) = match item with | : SystemInt32 -> print_endline "An integer" | : SystemDouble -> print_endline "A double" | : SystemString -> print_endline "A string" | : SystemObject -> print_endline "Unknown type" Listiter reconizeTypeWrongly thirdList Pattern matching over NET types is also useful for handling exceptions thrown by NET methods.

No technology book is complete these days without at least a casual mention of patterns. As we ve said before, Ajax is quite new, so the area has a lot of churn. Also, your knowledge will certainly grow as more and more Web sites take advantage of all Ajax has to offer. Still, we ll touch on a few basic patterns in the following sections. For a more complete list of patterns, point your browser to ajaxpatterns.org. Ajax Patterns and Best Practices by Christian Gross (Apress, 2006) also outlines the various patterns which you'll need to quickly write appliations that work.