This tutorial is intended to help readers understand how certain aspects of Microsoft's new AJAX Extensions technology works. AJAX Extensions is intended to simplify the development of AJAX-style functionality. As with all technologies, however, to use a tool well, it is important to understand the underlying technology that Atlas abstracts. One of the key ASP.NET AJAX abstractions is the new XML markup syntax developed to make coding with AJAX easier (originally included with the core Atlas files, XML markup is now a part of the CTP called AJAX Futures). With XML markup, developers can modify their code declaratively.
However, there are times when a developer may want to be able to change her code programmatically, and in order to accomplish this, she will need to understand that underneath the markup abstraction, she is actually dealing with good 'ol JavaScript and some custom JavaScript libraries developed by Microsoft. In order to demonstrate the relationship between the Atlas declarative model and the programmatic model, I will go through a series of examples in which the same task will be accomplished both declaratively and programmatically. I will be demonstrating how to use the PreviewDragDrop library file to perform basic drag-drop operations as well as setting up drop zones.
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