Building a Single Page App with a Repository Pattern but no Unit of Work - where to SaveChanges?

Building a Single Page App with a Repository Pattern but no Unit of Work -
where to SaveChanges?

References

Reference NO 1

http://stackoverflow.com/questions/15191096/building-a-single-page-app-with-a-repository-pattern-but-no-unit-of-work-where

Reference NO 2

http://www.asp.net/mvc/tutorials/getting-started-with-ef-using-mvc/implementing-the-repository-and-unit-of-work-patterns-in-an-asp-net-mvc-application

Reference NO 3

http://codetunnel.com/blog/post/should-you-return-iqueryablet-from-your-repositories

Reference NO 4

http://blog.gauffin.org/2013/01/repository-pattern-done-right/

Reference NO 5

http://social.msdn.microsoft.com/Forums/en-US/18de70eb-123e-4f4a-981e-8965d0f43ea8/action?threadDisplayName=ef4-with-repository-and-unit-of-work-patterns-is-that-necessary

Reference NO 6

http://www.primaryobjects.com/CMS/Article122.aspx

Reference NO 7

http://blog.longle.net/2013/05/11/genericizing-the-unit-of-work-pattern-repository-pattern-with-entity-framework-in-mvc/

Reference NO 8

http://codereview.stackexchange.com/questions/5556/entity-framework-with-repository-and-unit-of-work-pattern-and-poco-architecture