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A lazy solution is to periodically check for changes to the field, independently of any events. Could also let the user behavior trigger a validation check.

I wonder if a focus/blur combo would trigger the needed event and the value would be set? I need to try it out.

If you're using the jQuery Rails validations I believe you'll have to set the input's "changed" data to true before it'll run the validations again. Something like $(".my-input").data("changed", true);

If not, then good luck :D

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