Short comment on UnobtrusiveJavaScriptEnabled app setting

While looking into web.config file of the ASP.NET MVC 3 application you would notice an application setting called UnobtrusiveJavaScriptEnabled. Not sure what about you but for me it looked like a mysterious setting for turning on/off some mysterious functionality.

The purpose of that setting is explained by Brad Wilson in his post Unobtrusive Client Validation in ASP.NET MVC 3. Putting it short - with this setting turned off client side validation is being performed using Microsoft javascript libraries (the same way it was performed in ASP.NET MVC 1 and 2). Otherwise (with setting turned on) client side validation is performed using JQuery Validate.