Using JQuery to call asmx web service

I want to use jQuery to call a asmx web service to validate user logins. The Ajax call is successful but I don’t get any results. Can anyone help to find where the problem is?

Here is the web service:

Here is the code for the call:

$('#loginForm').submit(function(e) {
				var username = $('input[name="username"]').val();
				var password = $('input[name="password"]').val();
				var tablename = "tbl_CODNRUSERS";
				var userInfo = '<soap:Envelope xmlns:xsi="" xmlns:xsd="" xmlns:soap=""><soap:Body><validateUser xmlns=""><username>'
                    + username + '</username><password>'
                    + password + '</password><tablename>'
                    + tablename + '</tablename></validateUser></soap:Body></soap:Envelope>';
                    url: "http://localhost/UACServices/GSaaS.asmx?op=validateUser",
					type: "POST",
                    contentType: "text/xml; charset='utf-8'",

                    data: userInfo,
                    success: function(data) {
                    error: function(errMsg)
                        console.log("error: " + errMsg);
				return false;