Get value of custom attribute

Remove the context of your selector:

 var userType = $("input[name=ctrl_CustomerType]:checked").attr('xmlvalue');        alert("xmlvalue is: " + userType);

jquery radio-button attr

Your selector is wrong.

The input element is not children of a element where you are clicking, so you cannot pass this as a context to the selector

var userType = $("input[name=ctrl_CustomerType]:checked").attr('xmlvalue');

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