Gosh, you're so close.

If you change this method:
function fnClickAddEmail() {
     var email = $("input#email").val();
     $.post(
         "validateEmail.do",
         {sendValue: email},
         function(returnValue){   //Does this function called even my 
email is invalid? Am I getting email.jsp page in "returnValue"?
             addToTable(returnValue);
         },
         "text"
     );
}

To this:
function fnClickAddEmail() {
     var email = $("input#email").val();
     $.post(
         "validateEmail.do",
         {sendValue: email},
         function(returnValue){
                if (returnValue == "") {
                        // Show Error Message
                } else {
                        addToTable(returnValue);
                }
         },
         "text"
     );
}

This should get your implementation working for you.  You're still not
utilizing JSON, but with the modified method it should work for you.


Beez


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