asp.net code 128 barcode The horrific markup that s rendered by the Menu control. Stay tuned for a better way. in VS .NET

Maker USS Code 128 in VS .NET The horrific markup that s rendered by the Menu control. Stay tuned for a better way.

The horrific markup that s rendered by the Menu control. Stay tuned for a better way.
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Even though .NET 4 overhauls the markup rendered by the menu control, developers still using .NET 3.5 SP1 won t be able to benefit from all the great work the ASP.NET team has done in fixing the generated markup across all the server-side controls. This type of markup is a constant reminder of why we want more control over our HTML! One of the original strengths of server controls is that they can modify the markup rendered based on a browser. This was of critical importance in 2002, when the popular browsers treated markup in a very different way. This varied rendering was more important than control over the markup it was worth having to deal with generated markup and ClientIDs for the sake of cross-browser compatibility. Fast-forward to today. The major browsers now are on board with XHTML, and the same markup works well in various browsers. The architectural trade-offs are different, and the need to compromise on messy markup no longer exists.
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Two commonly used controls are <asp:TreeView /> and <asp:Calendar />. The TreeView nodes are postback links, but the visual aspect works just fine. The calendar relies heavily on the postback model for navigation, so it doesn t function in ASP.NET MVC except when viewing a single month. We still need tree views, and we still need calendars. With ASP.NET MVC, we ll tend to use more client-side UI functionality, such as that found in jQuery UI, which has a rich JavaScript calendar and more. We ve so far neglected the big daddy of ASP.NET server controls. Yes, we re talking about the GridView. The GridView is an interesting case, because it has so many different forms. At its simplest, the GridView is just an HTML table it s great for displaying tabular data. If we don t require any postback, then it should work, right It does, but there are a few gotchas along the way.
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The GridView
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The first issue is that there s no declarative way to bind the GridView to data coming from ViewData. It s possible to employ data-binding code directly in the view markup, inside <% %> code blocks as listing 7.1 demonstrates. This type of code should send bad vibes up your spine, but it s possible.
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Listing 7.1
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<% grid1.DataSource = Model; grid1.DataBind(); %>
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You also have the option of using the DataSource controls, such as ObjectDataSource, SqlDataSource, and XmlDataSource. Of course, in doing this you ve completely circumvented the MVC pattern and placed all your data access directly in the view! Figure 7.5 illustrates the grid rendering properly.
Leveraging existing ASP.NET features
Figure 7.5 The GridView renders properly.
Figure 7.5 shows our newly bound GridView in action. Unfortunately, that s all you get, because none of the advanced features of the GridView will work. No sorting, paging, editing, or selecting. Because of this, it s of limited utility and will probably only aid you during prototyping and demos. All is not lost, however. In ASP.NET MVC you can achieve the Holy Grail of an editable data grid, complete with sorting, paging, and editing, when you structure it in a different way. In fact, UI component vendors like Telerik are already offering UI components for use with ASP.NET MVC. You can find a free grid component here: http://www.telerik.com/products/aspnet-mvc/grid.aspx.
Where do I get the good stuff
The examples we ve shown here might be turning you off of ASP.NET MVC. But before you decide that you don t want to live without your TreeView and Menu controls, consider this: many thousands of samples online show how you can achieve the same functionality with a little bit of JavaScript and CSS. These are freely available solutions that many other platforms leverage. With ASP.NET MVC, we can do the same, and with minimal friction in applying them. Often, these solutions are so simple they make the declarative ASP.NET controls look like sledgehammers. Here are a few references for platform-agnostic solutions to tree views, menus, and tabs using jQuery:
jQuery Treeview example http://jquery.bassistance.de/treeview/demo/ jQuery Menu example http://jdsharp.us/jQuery/plugins/jdMenu/ jQuery Tabs example http://stilbuero.de/jquery/tabs_3/
Although ASP.NET MVC doesn t gain much from server controls as you ve clearly seen in these examples other aspects of ASP.NET function exactly as they did in Web Forms. We can use the ASP.NET platform in the same way as before. The first topic we ll investigate is state management.
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