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Conversely, advice code cannot be redefined. Inherited advice code is thus always available in a subaspect. The code in Listing 3-14 defines the abstract TraceAspect aspect with the abstract toBeTraced pointcut descriptor. TraceAspect2 extends TraceAspect and defines the toBeTraced pointcut descriptor. Listing 3-14. The Definition of an Abstract Aspect public abstract aspect TraceAspect { abstract pointcut toBeTraced(); before(): toBeTraced() { ... } } public aspect TraceAspect2 extends TraceAspect { pointcut toBeTraced(): call(* Order.*(..)); }

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

By default, a unique instance of an aspect is created when the application is launched. The aspect is then said to be a singleton. The same aspect instance is shared by all the application objects. In special cases, it can be useful to create several instances of a given aspect. Different application objects are then aspectized by the different instances. For example, this feature can be used to dedicate different pieces of data to each part of the application. The three following cases can occur: The aspect is a singleton, and only one instance of the aspect exists at run time. This is the default case. The aspect is instantiated several times, and the instances are associated with different application objects. The aspect is instantiated several times, and the instances are associated with different control-flow sequences of the application. No keyword exists for the first case because this is the default behavior when the aspect keyword is used. For the second case, two keywords are available: perthis and pertarget. The aspects can then be written as follows: aspect <name> perthis( <poincut> ) { ... } aspect <name> pertarget( <poincut> ) { ... } When perthis is used, an instance of the aspect is created for every object that is an executing object of the given pointcut. The other objects (those that are not executing objects of the pointcut) are not aspectized. When pertarget is used, an instance of the aspect is created for every object that is the target object of the given pointcut. For the third case, two keywords are available: percflow and percflowbelow. The aspects can then be written as follows:

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Restart Internet Explorer, and under the View menu there should now be a Script Debugger menu item. Script Debugger is now ready for use. Navigate to a Web page that has some JavaScript you d like to debug. To open Script Debugger, choose the View Script Debugger Open menu item. Script Debugger should open showing the code for the HTML page you re currently viewing, as shown in Figure 7-6.

In many web and desktop applications, you may have come across the typical UI construct for reordering lists that is often done by two buttons (one for Up and another for Down) placed adjacent to the list itself. The user then has to select the item in the list and click the appropriate button enough times to get the selected item in the designated position. It would certainly be nice to be able to simply drag the item to the desired position instead. You have already seen how easy it is with the controls provided in the ASP.NET AJAX tools to implement dragging and dropping of various controls on the page without page postbacks. However, trying to implement a data-bound list still requires much work to allow the user to reorganize the order of the items. The ReorderList control can be applied to a bound object source, such as an ObjectDataSource control, and provide AJAXstyle reordering of the bound items. Table 8-13 lists the main properties of this control.

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