After upgrading my ASP.NET MVC 4 project to jQuery 1.9, I started to get into trouble the moment I called jquery.validate.js.
This is the error message I got:
How can you fix this issue?
It seems that the introduction of jQuery 1.9 breaks the compatibility with the default jQuery.validation library(that is part of the ASP.NET MVC template). The guys of the jQuery.validation library are aware of the issue and already fixed in a new release of their library available on NuGet: http://nuget.org/packages/jQuery.Validation/.
So if you upgrade your web application to jQuery 1.9, don’t forget to also upgrade jQuery.validation to at least version 1.11.0.