jQuery validator add method: custom messages

I am using following code to show custom messages inside add method of jquery validation plugin. I referred this link: http://www.mainframes.co.uk/index.php/2011/04/07/jquery-form-validator-custom-validation-method-using-addmethod-for-validating-date-of-birth-dob/

$.validator.addMethod("nameId",function(value,element){

            var result = true;
        //check if pattern matches
                var pattern = new RegExp(<pattern>);                
            if(pattern.test(value)){            
                    //get availability via ajax call
                    $.ajaxSetup({
                        async: false,   
                        "error":function() {   
                            alert("error");
                    }});
                    $.getJSON("<url>", 
                    {
                        param: value
                    },
                    function(data) {

                            if(condition){
                                result = true;
                            }else{
                                $.validator.messages.nameId = "Msg 1";
                                    resul开发者_JS百科t = false;                     
                            }
                    });

            }else{
                                $.validator.messages.nameId = "Msg 2";
                                result = false;                         
            }
    return result;
 },"");

This doesn't show any errors while validating. What could be wrong above...

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What happens if you put the .getJSON call inside of the success callback function of the .ajaxSetup? Like this:

$.validator.addMethod("nameId",function(value,element){

    var result = true;

    var pattern = new RegExp(<pattern>);

    if(pattern.test(value)){            
        //get availability via ajax call
        $.ajaxSetup({
            async: false,
            "success": function() {
                $.getJSON("<url>", 
                {
                    param: value
                },
                function(data) {
                    if(condition){
                        result = true;
                    }else{
                        $.validator.messages.nameId = "Msg 1";
                            result = false;                     
                    }
                });
            },
            "error":function() {   
                alert("error");
            }
        });

    }else{
        $.validator.messages.nameId = "Msg 2";
        result = false;                         
    }
    return result;
 },"");

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Add this just before your return result line:

$.validator.messages.myvalidator = customError;

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You cant have asynchronous callbacks inside a validation method.