MVC :: Looking For Client Side Only Jquery Framework?

Anyone have any suggestions for 3rd party controls that work entirely client side?By this I mean the following using the example of an invoice:An invoice is a master, with children.I have to be able to select properties on the invoice and add lines to the invoice via a grid to obviously have the customer like my invoice editing window because they don't want to have to enter the basics and then save and then add the line items.In a classic asp.net/mvc.net model the server does the processing. This requires that you either store your data objects in the view state (in this case EF) or you store it in the session.Neither scales worth crap.What I'm looking to do is be able to create an entire form that interacts in javascript using jquery and never posts back to the server to be persistant. It may pull data from the server to update lists and do lookups etc. but it will never have to have the server hold information to be persistant while it's being built (and thus only when the user clicks save will it actually post the data back.In a perfect world what would happen is that the EF object would be converted to javascript and then used and bound, and updated. Once I'm done I'd post back the javascript object and it would be automatically converted to the EF equivalent class which I could then attach and save to the database.By doing this I can eliminate all persistant memory usage and indeed essentially ALL use of the Session or viewstate which would be super powerful.