Client side validation has never been easy.. Include jQuery and the validator.js < script src = " http://code.jquery.com/jquery-1.11.3.min.js " ></ script > < script src = " ../validate.js " ></ script > Simple validation < form id = " myForm " > < label >User Name < span class = " red-star " >*</ span > </ label > < input type = " text " name = " userName " class = " validate-required " /> < br /> < label >Password < span class = " red-star " >*</ span ></ label > < input type = " password " name = " password " class = " validate-required " /> < br /> < input type = " submit " value = " Login " /> </ form > ...