So there are a couple great walkthroughs out there that talk about using jquery jsonp in cross-domain scenarios. They talk a lot about the requesting and server side, but not so much about how to use the callback. So to clarify, I’ll step through what I did to make this work including providing my implementation for a new ActionResult called JsonPResult for MVC.
So the other day, I wanted to build a confirmation dialog using jQuery with an existing Asp.Net web forms Button control. I wanted this dialog to be modal; and upon confirmation, I wanted it to postback using the Button’s server-side click event. After toying with the jQuery dialog, I realized that its dialog doesn’t suspend the process while waiting for user input. So it also causes problems with confirmation since clicking the original button will always postback. So with a few tweaks, you can prevent the postback and emulate the click event pretty easily.
