Dragging and dropping in .NET framework

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Samples.CartZone.registerClass('Samples.CartZone, Sys.UI.Control, Sys.Preview.UI.IDropTarget);
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You re nearly done. Implementing drag and drop requires some effort, but in the end you ll have written code that can be easily modified and adapted to the majority of drag-and-drop scenarios. The final step is to wire together DOM elements and client controls to obtain a working example. That s what you ll do in the next section.
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12.1.8 Putting together the pieces
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Drum roll, please: You re ready to test the shopping-cart example. In the code downloadable at http://www.manning.com/gallo, we created an ASP.NET AJAX CTP-enabled website and copied the code for the BookItem and CartZone controls in two separate JavaScript files stored in the ScriptLibrary folder. Then, we created a new ASP.NET page named BasicDragDrop.aspx and referenced the two script files in the Scripts section of the ScriptManager control. Finally, we copied the code shown in listing 12.6 in the page s form tag.
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Listing 12.6 ASP.NET page for testing the drag-and-drop example
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<img id="imgBook" src="Images/book.gif" alt="" /> <div id="cartZone" class="dropzone"> <img src="Images/shopping_cart.jpg" alt="" /> </div> <script type="text/javascript"> <!-Sys.Application.add_init(pageInit); function pageInit(sender, e) $create(Samples.BookItem, {bookId: '1-933988-14-2'}, null, null, $get('imgBook')); $create(Samples.CartZone, null, null, null, $get('cartZone')); } //--> </script>
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The code consists of some HTML markup and a JavaScript code block. The markup code contains the DOM elements used to represent the book and the shopping cart. The JavaScript code block contains the $create statements needed to instantiate the BookItem and CartZone controls. As you can see, the two controls are wired to the HTML elements that represent the book and the shopping
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A drag-and-drop shopping cart
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cart. You also set the bookId property of the BookItem instance to the ISBN code of the book. As soon as the page is run, you can drag the book image over the shopping cart. If you try to drop the book outside the cart, it returns to its original position. If, on the other hand, you drop the book over the shopping cart, the operation succeeds, and you get a message box displaying the drag data. You now possess the necessary skills and code to add drag-and-drop capabilities to web pages using ASP.NET AJAX. Let s take the drag-and-drop scenario a step further. In the next section, you ll see how to leverage it to take advantage of the ASP.NET server-centric model and data-binding capabilities.
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12.2 A drag-and-drop shopping cart
In the previous section, you built the client controls needed to perform drag and drop with DOM elements in a web page. Now, you need to put together client components and server controls to leverage the server-centric development model offered by ASP.NET. With the server-centric model, you can build server controls that are associated with client components. This way, you obtain ASP.NET controls with rich client capabilities. With the techniques studied in chapter 9, it s easy to create an extender or a script control that programmatically instantiates in the page the client component it needs and loads the necessary script files. In this section, you ll combine server controls and client components to leverage the drag-and-drop scenario introduced in the previous section. The result, shown in figure 12.7, will be a shopping cart system with drag-and-drop support, built with the ASP.NET AJAX Extensions. The shopping-cart application features a catalog control that lists the books available and a shopping cart control that displays information about the articles you add. The user can add a book to the cart by clicking the Add To Cart button displayed under the corresponding article. The button causes the shopping cart to be updated and to display the title and quantity of each article. You can also drag books from the catalog and drop them in the shopping cart. Once an article is dropped, the shopping cart is updated accordingly. The final touch is using an UpdatePanel control to update the shopping cart asynchronously, without needing to reload the whole page. The full source code for the example is available for download at http:// www.manning.com/gallo, and it s provided as an ASP.NET AJAX-enabled website. We recommend that you look at it and, even better, follow the discussion with the solution opened in Visual Studio. In the following sections, we ll focus on the
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