ASP.NET AJAX "as you type" functionality

Although this is FAQ i still couldn't find a suitable solution. I'd like to filter out a list (rendered with ListView control placed to UpdatePanel) as user types something in TextBox. This blog post describes exactly what i need - raise a postback after a specified number of characters added. But the implementation has a few minor drawbacks. I'm surprised AutoCompleteExtender isn't generic enough to handle such cases and that i cannot find other out-of-the-box solutions. So what would you r开发者_如何学JAVAecommend as an alternative solution?

You could have a look at the jQuery autocomplete plugin - you should be able to use some of the code there to get you started. Plugin page