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The Menu Control
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Menus are pervasive in today s Web sites. ASP.NET 2.0 addresses this reality with a new control the Menu control to complete the end-to-end site navigation functionality in the ASP.NET control toolbox. The Menu control can be bound to any data source and also supports an explicit list of items for the simplest cases. Unlike the TreeView, the Menu control doesn t support the download-on-demand functionality that brings data down on the browser only when needed. (The TreeView does this using the script callback mechanism we discussed in 1.) This is because the download size of menu controls is typically small and the costs of such a complex feature wouldn t pay off. An ASP.NET menu object consists of menu items (such as those shown in Figure 7-5) stored in a collection. MenuItem is the class that describes a single item, and MenuItems is the collection property that returns all the child items of a given menu. The control supports a few static and dynamic styles for constituent elements such as the selected item, submenus, and the item the mouse is currently hovering over. Dynamic styles are applied using the Dynamic HTML object model. An example of a dynamic style is one that is assigned to the menu item currently under the mouse. Static styles are programmatically set and never change after user actions.
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C07620245.fm Page 207 Tuesday, June 8, 2004 6:23 PM
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Figure 7-5 A simple Menu control in action
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Here s a code snippet for the menu shown in the figure:
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<asp:Menu ID="Menu1 Runat="server"> <Items> <asp:MenuItem Text="Intro"> <asp:MenuItem Text="Read about the book /> <asp:MenuItem Text="Explore the TOC /> <asp:MenuItem Text="Get sample code /> <asp:MenuItem Text="Buy the book /> </asp:MenuItem> <asp:MenuItem Text="Sample Code /> <asp:MenuItem Text="Errata /> </Items> </asp:Menu>
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The GridView Control
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The GridView is a major upgrade of the ASP.NET 1.x DataGrid control. It provides the same set of capabilities, plus a long list of extensions and improvements. The DataGrid which is still fully supported in ASP.NET 2.0 is an extremely powerful and versatile control, but it has one big drawback: it requires you to write a lot of custom code, even to handle relatively simple (but common) operations such as paging, sorting, editing, or deleting data. The GridView control was designed from the ground up to work around this limitation and make two-way data binding happen with as little code as possible. The control is tightly connected to the family of new data source controls and can handle direct data source updates as long as the underlying data source object supports these capabilities.
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Part II
Data Access
This virtually codeless two-way data binding is by far the most notable feature of the new GridView control, but the enhancements are numerous. The control improves over the DataGrid in many ways, including adding the ability to define multiple primary key fields, new column types, and style and templating options. The GridView also has an extended eventing model that allows you to handle or cancel events.
The GridView Object Model
The GridView control provides a tabular, grid-like view of the contents of a data source. Each column represents a data source field, and each row represents a record. The class is declared as follows:
public class GridView : CompositeDataBoundControl, IPostBackEventHandler, IPostBackContainer, ICallbackContainer, ICallbackEventHandler, INamingContainer
The base class ensures data binding support. The implementation of the IPostBackEventHandler and IPostBackContainer interfaces allows the control to define a centralized console to handle all the server-side events that constituent controls (such as link buttons) might generate. Any users clicking make the page post back. The postback event is resolved, and control passes to the RaisePostBackEvent method on the interface. The method examines the command name carried by the event and decides what to do. Typically, it starts an update, select, or sort operation on the underlying data source. The ICallbackContainer and ICallbackEventHandler interfaces make possible more effective paging and sorting, supported through client-side, out-of-band calls using the new script callback technology. (See 1.) Let s begin our tour of the GridView control by looking at the control s programming interface.
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