Pre routing event that so one can conditionally stop routing.

[nmingneau]

Example from angularjs:

$scope.$on('$locationChangeStart', function(event, next, current) {
    if ($scope.form.$invalid) {
       event.preventDefault();
    }
});

[justinbmeyer]

@chasenlehara it would be good to think about how can-bind could maybe prevent the writing of one object to another.

[chasenlehara]

can-bind has setChild and setParent options, so if you need control over when values are set, you can use those.

[That’s not an answer to this issue.]