We have received a lot of feedback from users about not being able to pass additional information to the AutoComplete webservice which limits their usage of the extender. We decided to absorb that input and add support to all extenders that issue XmlHttpRequests the option of passing in data above and beyond what is allowed by the standard webservice parameters, something that closely resembles the DynamicPopulate style support, to provide to flexible context. With this support in, you will be able to bind the AutoComplete extender to any controls on the page and have a richer, contextual and relevant set of results returned by the AutoComplete webservice. It will be available in the next release of the Toolkit around the end of May.
The sample demonstrates a simple lookup scenario where the allowed values in the second textbox are tied to the value in the first one. The second textbox uses the text in the first one to perform a webservice call and retrieve results. Check it out. If you are a movie freak or if you like to read Hollywood gossip, there just might be something more than AJAX to look forward to in the sample. Let us know what you think. We are listening.