angularJS: how to revert / prevent radio button event?

Question

i have a (non-working) example in http://jsfiddle.net/S2kc7/1/

Answer 1

The accepted answer does not covers scenerios which makes ajax calls on model change.

You can completely prevent changes by surrounding radio inputs with label tag.

$scope.confirmChange = function(event) {
   if(!confirm('sure?')) {
     event.preventDefault();
   } 
};