jQuery Validator with custom method -

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i totally new jquery , need add validation form. have select box 3 types of credit card options - visa, mastercard , amex. have text box entering security code on credit card. however, security code required if amex selected.

the select box named "cardtype" , textbox named "securitycode"

so if amex selected nothing entered securitycode textbox, want 1 of jquery red errors appear beneath textbox when tries submit form.

i know has validator.addmethod not know how begin add main.js file. 

$.validator.addmethod("securitycode",             function(value, element) {                    var card_type = $("input[name='cardtype']").val();                    if(card_type == "amex" && !$.trim(value) ) {                           return false;                    }                    else {                           return true;                    }               },                  "please ad security code"  );

if card type amex , have not entered security code value , can not proceed.

in validation rules , call custom validator 

securitycode  {                  securitycode : true                },

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