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Now that execution has been suspended, you re free to perform tasks such as inspecting variable values and viewing the call stack to determine the exact order of execution. So far, the hard breakpoint has probably worked exactly as you expected it to work. Now, how about the future breakpoint How can you suspend execution at the future breakpoint since there is no action or event that you control that causes its execution Recall that JavaScript code that exists outside the body of a function is executed as soon as the page is loaded. So, to encounter the breakpoint at line 11, you need to switch to the browser window and click the Reload button. Doing so will reload the page and suspend

The customer class should not need to be aware of all the data-integrity rules that other classes in the application impose Modifying the customer class to take these data-integrity rules into account restricts the possibilities of reusing the class in other situations In other words, once the customer class implements any functionality that is linked to a different class, customer is no longer independently reusable, in many cases Despite the fact that the customer class is not the ideal place to implement this referential-integrity rule, many object-oriented programs work this way for lack of a better solution You might be thinking about integrating this functionality into an order class instead, but this solution is no better No reason exists for the order class to allow the deletion of a customer.

CHAPTER 8 USING THE ASP.NET AJAX CONTROL TOOLKIT (PART 2)

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Strictly speaking, this rule is linked to neither the customers nor the orders but cuts across these two types of entities One of the aims of dividing the data into classes is making the classes independent from one another However, crosscutting functionalities, such as the rules of referential integrity, appear superimposed on the division violating the independence of the classes In other words, OOP does not allow you to neatly implement crosscutting functionalities As a compromise, you can resign yourself to implementing them in individual classes, but remain conscious that this solution is not ideal..

MinimumWidth="50" MinimumHeight="26" MaximumWidth="250" MaximumHeight="170" HandleOffsetX="3" HandleOffsetY="3" OnClientResize="OnClientResizeImage" />

Figure 1-5. Amazon s diamond search If it isn t exactly new, the approach that is the meat of Ajax is an important shift in the Internet s default request/response paradigm. Web application developers are now free to interact with the server asynchronously, meaning they can perform many tasks that before were limited to thick clients. For example, when a user enters a zip code, you can validate it and populate other parts of a form with the city and state; or when they select United States, you can populate a state drop-down list. We ve been able to mimic these approaches before, but it s much simpler to do with Ajax.

In OOP, the principal way that objects interact is by invoking methods. In other words, an object that needs to carry out an action invokes a method that belongs to another object. (An object can also invoke one of its own methods.) OOP always entail two roles: that of the invoker and that of the invoked. When you write the code to call a method, you do not need to worry about how the service is implemented because the call interacts only with the interface of the invoked object. You need only ensure that the parameters in the call correspond to those of the method s signature. Because methods are implemented within classes, you write each method as a block of code that is clearly delimited. To change a method, you obviously modify the file that contains the class where the method is defined. If you alter just the body of the method, the modification is transparent because the method will still be called in exactly the same way. However, if you change the method s signature (for example, by adding a parameter), further implications arise. You must then modify all the calls to the method, hence you must modify any classes that invoke the method. If these calls exist in several places in the program, making the changes can be extremely time-consuming. The main point is this: Even though the implementation of a method is located in a single class, the calls to that method can be scattered throughout the application. This phenomenon of code scattering slows down maintenance tasks and makes it difficult for object-oriented applications to adapt and evolve. Any change in the way that a service is used requires many other changes a costly process that can also introduce errors.

The OnClientResize property defines a client-side function to execute when the image is resized, which in this case has the following script:

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