Javascript add validation error

To highlight or show the validation error on control using Javascript

$("#objID").addClass('input-validation-error');

Remove the validation error:
$("#objID").removeClass('input-validation-error');

Some userful blogs for MCPD

http://www.microsoftvirtualacademy.com/
http://www.w3schools.com/

http://www.bloggedbychris.com/2012/09/19/microsoft-exam-70-480-study-guide/

http://www.bloggedbychris.com/2012/11/06/microsoft-exam-70-486-study-guide/

http://www.bloggedbychris.com/2013/01/09/microsoft-exam-70-487-study-guide/